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",[1632,1748,1749],{"class":1653},"{\n",[1632,1751,1753,1756,1759,1761,1763,1766,1769,1772],{"class":1634,"line":1752},6,[1632,1754,1755],{"class":1645},"        const",[1632,1757,1758],{"class":1679}," getter",[1632,1760,1683],{"class":1653},[1632,1762,1664],{"class":1679},[1632,1764,1765],{"class":1686},"[",[1632,1767,1768],{"class":1679},"key",[1632,1770,1771],{"class":1686},"]",[1632,1773,1716],{"class":1653},[1632,1775,1777],{"class":1634,"line":1776},7,[1632,1778,1723],{"emptyLinePlaceholder":1722},[1632,1780,1782],{"class":1634,"line":1781},8,[1632,1783,1784],{"class":1638},"        // 每个 computed 属性对应一个 lazy Watcher\n",[1632,1786,1788,1791,1793,1795,1798,1801,1804,1807,1809,1811,1813,1815,1817,1820,1822,1825,1828,1831,1835,1838,1840],{"class":1634,"line":1787},9,[1632,1789,1790],{"class":1679},"        watchers",[1632,1792,1765],{"class":1686},[1632,1794,1768],{"class":1679},[1632,1796,1797],{"class":1686},"] ",[1632,1799,1800],{"class":1653},"=",[1632,1802,1803],{"class":1653}," new",[1632,1805,1806],{"class":1649}," Watcher",[1632,1808,1654],{"class":1686},[1632,1810,1658],{"class":1679},[1632,1812,1661],{"class":1653},[1632,1814,1758],{"class":1679},[1632,1816,1661],{"class":1653},[1632,1818,1819],{"class":1679}," noop",[1632,1821,1661],{"class":1653},[1632,1823,1824],{"class":1653}," {",[1632,1826,1827],{"class":1686}," lazy",[1632,1829,1830],{"class":1653},":",[1632,1832,1834],{"class":1833},"sPKOg"," true",[1632,1836,1837],{"class":1653}," }",[1632,1839,1667],{"class":1686},[1632,1841,1716],{"class":1653},[1632,1843,1845],{"class":1634,"line":1844},10,[1632,1846,1723],{"emptyLinePlaceholder":1722},[1632,1848,1850,1853,1855,1858,1860,1862,1864,1867,1870],{"class":1634,"line":1849},11,[1632,1851,1852],{"class":1729},"        if",[1632,1854,1687],{"class":1686},[1632,1856,1857],{"class":1653},"!",[1632,1859,1654],{"class":1686},[1632,1861,1768],{"class":1679},[1632,1863,1741],{"class":1653},[1632,1865,1866],{"class":1679}," vm",[1632,1868,1869],{"class":1686},")) ",[1632,1871,1749],{"class":1653},[1632,1873,1875,1878,1880,1882,1884,1886,1888,1890,1892],{"class":1634,"line":1874},12,[1632,1876,1877],{"class":1649},"            defineComputed",[1632,1879,1654],{"class":1686},[1632,1881,1658],{"class":1679},[1632,1883,1661],{"class":1653},[1632,1885,1738],{"class":1679},[1632,1887,1661],{"class":1653},[1632,1889,1758],{"class":1679},[1632,1891,1667],{"class":1686},[1632,1893,1716],{"class":1653},[1632,1895,1897],{"class":1634,"line":1896},13,[1632,1898,1899],{"class":1653},"        }\n",[1632,1901,1903],{"class":1634,"line":1902},14,[1632,1904,1905],{"class":1653},"    }\n",[1632,1907,1909],{"class":1634,"line":1908},15,[1632,1910,1911],{"class":1653},"}\n",[1531,1913,1914,1915,1918],{},"关键点在 ",[1534,1916,1917],{},"{ lazy: true }","。再看 Watcher 构造函数对这个选项的处理：",[1623,1920,1922],{"className":1625,"code":1921,"language":1627,"meta":1628,"style":1628},"// 简化自 src/core/observer/watcher.js 的 constructor\nconstructor(vm, expOrFn, cb, options) {\n    this.vm = vm;\n    this.getter = expOrFn;\n    this.lazy = options.lazy;\n    this.dirty = this.lazy; // lazy Watcher 初始 dirty 为 true\n\n    // lazy 时创建阶段不求值，value 先是 undefined\n    this.value = this.lazy ? undefined : this.get();\n}\n",[1534,1923,1924,1929,1954,1967,1980,1998,2018,2022,2027,2059],{"__ignoreMap":1628},[1632,1925,1926],{"class":1634,"line":1635},[1632,1927,1928],{"class":1638},"// 简化自 src/core/observer/watcher.js 的 constructor\n",[1632,1930,1931,1934,1937,1939,1942,1944,1947,1949,1952],{"class":1634,"line":1642},[1632,1932,1933],{"class":1649},"constructor",[1632,1935,1936],{"class":1679},"(vm",[1632,1938,1661],{"class":1653},[1632,1940,1941],{"class":1679}," expOrFn",[1632,1943,1661],{"class":1653},[1632,1945,1946],{"class":1679}," cb",[1632,1948,1661],{"class":1653},[1632,1950,1951],{"class":1679}," options) ",[1632,1953,1749],{"class":1653},[1632,1955,1956,1959,1961,1963,1965],{"class":1634,"line":1673},[1632,1957,1958],{"class":1653},"    this.",[1632,1960,1658],{"class":1679},[1632,1962,1683],{"class":1653},[1632,1964,1866],{"class":1679},[1632,1966,1716],{"class":1653},[1632,1968,1969,1971,1974,1976,1978],{"class":1634,"line":1719},[1632,1970,1958],{"class":1653},[1632,1972,1973],{"class":1679},"getter",[1632,1975,1683],{"class":1653},[1632,1977,1941],{"class":1679},[1632,1979,1716],{"class":1653},[1632,1981,1982,1984,1987,1989,1992,1994,1996],{"class":1634,"line":1726},[1632,1983,1958],{"class":1653},[1632,1985,1986],{"class":1679},"lazy",[1632,1988,1683],{"class":1653},[1632,1990,1991],{"class":1679}," options",[1632,1993,1692],{"class":1653},[1632,1995,1986],{"class":1679},[1632,1997,1716],{"class":1653},[1632,1999,2000,2002,2005,2007,2010,2012,2015],{"class":1634,"line":1752},[1632,2001,1958],{"class":1653},[1632,2003,2004],{"class":1679},"dirty",[1632,2006,1683],{"class":1653},[1632,2008,2009],{"class":1653}," this.",[1632,2011,1986],{"class":1679},[1632,2013,2014],{"class":1653},";",[1632,2016,2017],{"class":1638}," // lazy Watcher 初始 dirty 为 true\n",[1632,2019,2020],{"class":1634,"line":1776},[1632,2021,1723],{"emptyLinePlaceholder":1722},[1632,2023,2024],{"class":1634,"line":1781},[1632,2025,2026],{"class":1638},"    // lazy 时创建阶段不求值，value 先是 undefined\n",[1632,2028,2029,2031,2034,2036,2038,2040,2043,2046,2049,2051,2054,2057],{"class":1634,"line":1787},[1632,2030,1958],{"class":1653},[1632,2032,2033],{"class":1679},"value",[1632,2035,1683],{"class":1653},[1632,2037,2009],{"class":1653},[1632,2039,1986],{"class":1679},[1632,2041,2042],{"class":1653}," ?",[1632,2044,2045],{"class":1653}," undefined",[1632,2047,2048],{"class":1653}," :",[1632,2050,2009],{"class":1653},[1632,2052,2053],{"class":1649},"get",[1632,2055,2056],{"class":1686},"()",[1632,2058,1716],{"class":1653},[1632,2060,2061],{"class":1634,"line":1844},[1632,2062,1911],{"class":1653},[1531,2064,2065,2066,2069,2070,2073,2074,2076,2077,2080],{},"普通 Watcher 创建时会立刻 ",[1534,2067,2068],{},"this.get()"," 求值，而 lazy Watcher 创建时",[1546,2071,2072],{},"什么都不算","，只把 ",[1534,2075,2004],{}," 标记为 ",[1534,2078,2079],{},"true","，意思是\"我的值还没算，是脏的\"。",[1565,2082],{},[1526,2084,2086],{"id":2085},"缓存的本质dirty-开关","🧠 缓存的本质：dirty 开关",[1531,2088,2089,2091,2092,2095,2096,2099],{},[1534,2090,1620],{}," 里的 ",[1534,2093,2094],{},"defineComputed"," 会把 computed 属性挂载到 vm 上，访问 ",[1534,2097,2098],{},"this.xxx"," 时实际走的是这个 get：",[1623,2101,2103],{"className":1625,"code":2102,"language":1627,"meta":1628,"style":1628},"// 简化自 src/core/instance/state.js 的 defineComputed\nfunction defineComputed(target, key, userDef) {\n    Object.defineProperty(target, key, {\n        get() {\n            const watcher = target._computedWatchers[key];\n            if (watcher) {\n                if (watcher.dirty) {\n                    watcher.evaluate(); // 只有 dirty 为 true 才求值\n                }\n                return watcher.value; // 否则直接返回缓存的值\n            }\n        },\n        set() {},\n    });\n}\n",[1534,2104,2105,2110,2135,2157,2166,2191,2205,2222,2239,2244,2260,2265,2270,2280,2289],{"__ignoreMap":1628},[1632,2106,2107],{"class":1634,"line":1635},[1632,2108,2109],{"class":1638},"// 简化自 src/core/instance/state.js 的 defineComputed\n",[1632,2111,2112,2114,2117,2119,2122,2124,2126,2128,2131,2133],{"class":1634,"line":1642},[1632,2113,1646],{"class":1645},[1632,2115,2116],{"class":1649}," defineComputed",[1632,2118,1654],{"class":1653},[1632,2120,2121],{"class":1657},"target",[1632,2123,1661],{"class":1653},[1632,2125,1738],{"class":1657},[1632,2127,1661],{"class":1653},[1632,2129,2130],{"class":1657}," userDef",[1632,2132,1667],{"class":1653},[1632,2134,1670],{"class":1653},[1632,2136,2137,2140,2142,2145,2147,2149,2151,2153,2155],{"class":1634,"line":1673},[1632,2138,2139],{"class":1679},"    Object",[1632,2141,1692],{"class":1653},[1632,2143,2144],{"class":1649},"defineProperty",[1632,2146,1654],{"class":1686},[1632,2148,2121],{"class":1679},[1632,2150,1661],{"class":1653},[1632,2152,1738],{"class":1679},[1632,2154,1661],{"class":1653},[1632,2156,1670],{"class":1653},[1632,2158,2159,2162,2164],{"class":1634,"line":1719},[1632,2160,2161],{"class":1686},"        get",[1632,2163,2056],{"class":1653},[1632,2165,1670],{"class":1653},[1632,2167,2168,2171,2174,2176,2179,2181,2183,2185,2187,2189],{"class":1634,"line":1726},[1632,2169,2170],{"class":1645},"            const",[1632,2172,2173],{"class":1679}," watcher",[1632,2175,1683],{"class":1653},[1632,2177,2178],{"class":1679}," target",[1632,2180,1692],{"class":1653},[1632,2182,1695],{"class":1679},[1632,2184,1765],{"class":1686},[1632,2186,1768],{"class":1679},[1632,2188,1771],{"class":1686},[1632,2190,1716],{"class":1653},[1632,2192,2193,2196,2198,2201,2203],{"class":1634,"line":1752},[1632,2194,2195],{"class":1729},"            if",[1632,2197,1687],{"class":1686},[1632,2199,2200],{"class":1679},"watcher",[1632,2202,1746],{"class":1686},[1632,2204,1749],{"class":1653},[1632,2206,2207,2210,2212,2214,2216,2218,2220],{"class":1634,"line":1776},[1632,2208,2209],{"class":1729},"                if",[1632,2211,1687],{"class":1686},[1632,2213,2200],{"class":1679},[1632,2215,1692],{"class":1653},[1632,2217,2004],{"class":1679},[1632,2219,1746],{"class":1686},[1632,2221,1749],{"class":1653},[1632,2223,2224,2227,2229,2232,2234,2236],{"class":1634,"line":1781},[1632,2225,2226],{"class":1679},"                    watcher",[1632,2228,1692],{"class":1653},[1632,2230,2231],{"class":1649},"evaluate",[1632,2233,2056],{"class":1686},[1632,2235,2014],{"class":1653},[1632,2237,2238],{"class":1638}," // 只有 dirty 为 true 才求值\n",[1632,2240,2241],{"class":1634,"line":1787},[1632,2242,2243],{"class":1653},"                }\n",[1632,2245,2246,2249,2251,2253,2255,2257],{"class":1634,"line":1844},[1632,2247,2248],{"class":1729},"                return",[1632,2250,2173],{"class":1679},[1632,2252,1692],{"class":1653},[1632,2254,2033],{"class":1679},[1632,2256,2014],{"class":1653},[1632,2258,2259],{"class":1638}," // 否则直接返回缓存的值\n",[1632,2261,2262],{"class":1634,"line":1849},[1632,2263,2264],{"class":1653},"            }\n",[1632,2266,2267],{"class":1634,"line":1874},[1632,2268,2269],{"class":1653},"        },\n",[1632,2271,2272,2275,2277],{"class":1634,"line":1896},[1632,2273,2274],{"class":1686},"        set",[1632,2276,2056],{"class":1653},[1632,2278,2279],{"class":1653}," {},\n",[1632,2281,2282,2285,2287],{"class":1634,"line":1902},[1632,2283,2284],{"class":1653},"    }",[1632,2286,1667],{"class":1686},[1632,2288,1716],{"class":1653},[1632,2290,2291],{"class":1634,"line":1908},[1632,2292,1911],{"class":1653},[1531,2294,2295,2296,2298],{},"配套的 ",[1534,2297,2231],{}," 方法：",[1623,2300,2302],{"className":1625,"code":2301,"language":1627,"meta":1628,"style":1628},"// 简化自 src/core/observer/watcher.js\nevaluate() {\n    this.value = this.get(); // 真正执行 getter 求值\n    this.dirty = false;      // 算完了，标记为干净\n}\n",[1534,2303,2304,2309,2318,2337,2353],{"__ignoreMap":1628},[1632,2305,2306],{"class":1634,"line":1635},[1632,2307,2308],{"class":1638},"// 简化自 src/core/observer/watcher.js\n",[1632,2310,2311,2313,2316],{"class":1634,"line":1642},[1632,2312,2231],{"class":1649},[1632,2314,2315],{"class":1679},"() ",[1632,2317,1749],{"class":1653},[1632,2319,2320,2322,2324,2326,2328,2330,2332,2334],{"class":1634,"line":1673},[1632,2321,1958],{"class":1653},[1632,2323,2033],{"class":1679},[1632,2325,1683],{"class":1653},[1632,2327,2009],{"class":1653},[1632,2329,2053],{"class":1649},[1632,2331,2056],{"class":1686},[1632,2333,2014],{"class":1653},[1632,2335,2336],{"class":1638}," // 真正执行 getter 求值\n",[1632,2338,2339,2341,2343,2345,2348,2350],{"class":1634,"line":1719},[1632,2340,1958],{"class":1653},[1632,2342,2004],{"class":1679},[1632,2344,1683],{"class":1653},[1632,2346,2347],{"class":1833}," false",[1632,2349,2014],{"class":1653},[1632,2351,2352],{"class":1638},"      // 算完了，标记为干净\n",[1632,2354,2355],{"class":1634,"line":1726},[1632,2356,1911],{"class":1653},[1531,2358,2359],{},"逻辑非常直白：",[1586,2361,2362,2381],{},[1589,2363,2364,2366,2367,2369,2370,2373,2374,2376,2377,2380],{},[1534,2365,2004],{}," 为 ",[1534,2368,2079],{},"：执行 getter 算出值，缓存到 ",[1534,2371,2372],{},"watcher.value","，把 ",[1534,2375,2004],{}," 置为 ",[1534,2378,2379],{},"false","。",[1589,2382,2383,2366,2385,2387,2388,2380],{},[1534,2384,2004],{},[1534,2386,2379],{},"：跳过计算，直接返回 ",[1534,2389,2372],{},[1531,2391,2392,2401],{},[1546,2393,2394,2395,2397,2398,2400],{},"computed 的缓存，本质就是一个 ",[1534,2396,2004],{}," 布尔开关加一个 ",[1534,2399,2033],{}," 缓存。"," 第一次访问时算一次，之后只要依赖没变，访问多少次都直接返回缓存。",[1565,2403],{},[1526,2405,2407],{"id":2406},"缓存什么时候失效","⚡ 缓存什么时候失效",[1531,2409,2410,2411,2414],{},"缓存不能一直用下去，computed 依赖的响应式数据变化时，缓存必须失效。看 Watcher 的 ",[1534,2412,2413],{},"update"," 方法（依赖变化时被 Dep 通知调用）：",[1623,2416,2418],{"className":1625,"code":2417,"language":1627,"meta":1628,"style":1628},"// 简化自 src/core/observer/watcher.js 的 update\nupdate() {\n    if (this.lazy) {\n        // lazy Watcher 不立刻重算，只把 dirty 置回 true\n        this.dirty = true;\n    } else {\n        this.run();\n    }\n}\n",[1534,2419,2420,2425,2433,2449,2454,2467,2476,2487,2491],{"__ignoreMap":1628},[1632,2421,2422],{"class":1634,"line":1635},[1632,2423,2424],{"class":1638},"// 简化自 src/core/observer/watcher.js 的 update\n",[1632,2426,2427,2429,2431],{"class":1634,"line":1642},[1632,2428,2413],{"class":1649},[1632,2430,2315],{"class":1679},[1632,2432,1749],{"class":1653},[1632,2434,2435,2438,2440,2443,2445,2447],{"class":1634,"line":1673},[1632,2436,2437],{"class":1729},"    if",[1632,2439,1687],{"class":1686},[1632,2441,2442],{"class":1653},"this.",[1632,2444,1986],{"class":1679},[1632,2446,1746],{"class":1686},[1632,2448,1749],{"class":1653},[1632,2450,2451],{"class":1634,"line":1719},[1632,2452,2453],{"class":1638},"        // lazy Watcher 不立刻重算，只把 dirty 置回 true\n",[1632,2455,2456,2459,2461,2463,2465],{"class":1634,"line":1726},[1632,2457,2458],{"class":1653},"        this.",[1632,2460,2004],{"class":1679},[1632,2462,1683],{"class":1653},[1632,2464,1834],{"class":1833},[1632,2466,1716],{"class":1653},[1632,2468,2469,2471,2474],{"class":1634,"line":1752},[1632,2470,2284],{"class":1653},[1632,2472,2473],{"class":1729}," else",[1632,2475,1670],{"class":1653},[1632,2477,2478,2480,2483,2485],{"class":1634,"line":1776},[1632,2479,2458],{"class":1653},[1632,2481,2482],{"class":1649},"run",[1632,2484,2056],{"class":1686},[1632,2486,1716],{"class":1653},[1632,2488,2489],{"class":1634,"line":1781},[1632,2490,1905],{"class":1653},[1632,2492,2493],{"class":1634,"line":1787},[1632,2494,1911],{"class":1653},[1531,2496,2497,2498,2501,2502,2504,2505,2507,2508,2511,2512,2514],{},"注意这里的设计：",[1546,2499,2500],{},"依赖变化时并不立刻重新计算","，只是把 ",[1534,2503,2004],{}," 置回 ",[1534,2506,2079],{},"，相当于贴了一张\"值已过期\"的标签。真正的重算发生在",[1546,2509,2510],{},"下次有人访问这个 computed 属性","的时候（也就是上面 get 里的 ",[1534,2513,2231],{},"）。",[1531,2516,2517],{},"这样做的好处是：如果数据变了但模板这次根本没用到这个 computed，就一次多余的计算都不会发生。",[1531,2519,2520,2521,2524,2525,2528],{},"对比一下 ",[1534,2522,2523],{},"methods","：模板里调用方法没有任何缓存，",[1546,2526,2527],{},"每次组件重新渲染，方法都会重新执行一遍","。这就是\"能用 computed 派生的值就不要用 methods\"的源码依据。",[1565,2530],{},[1526,2532,2534],{"id":2533},"watch-的实现普通-watcher-回调","🛠 watch 的实现：普通 Watcher + 回调",[1531,2536,2537,2539,2540,2543,2544,1584],{},[1534,2538,1540],{}," 选项在 ",[1534,2541,2542],{},"initWatch"," 中被处理，最终都汇聚到 ",[1534,2545,2546],{},"vm.$watch",[1623,2548,2550],{"className":1625,"code":2549,"language":1627,"meta":1628,"style":1628},"// 简化自 src/core/instance/state.js 的 $watch\nVue.prototype.$watch = function (expOrFn, cb, options) {\n    const vm = this;\n    options = options || {};\n    options.user = true; // 标记为用户 Watcher\n\n    const watcher = new Watcher(vm, expOrFn, cb, options);\n\n    if (options.immediate) {\n        cb.call(vm, watcher.value); // immediate：拿到初始值立刻回调一次\n    }\n\n    return function unwatchFn() {\n        watcher.teardown(); // 返回取消监听的函数\n    };\n};\n",[1534,2551,2552,2557,2595,2606,2621,2639,2643,2675,2679,2697,2726,2730,2734,2748,2765,2770],{"__ignoreMap":1628},[1632,2553,2554],{"class":1634,"line":1635},[1632,2555,2556],{"class":1638},"// 简化自 src/core/instance/state.js 的 $watch\n",[1632,2558,2559,2563,2565,2568,2570,2573,2575,2578,2580,2583,2585,2587,2589,2591,2593],{"class":1634,"line":1642},[1632,2560,2562],{"class":2561},"sYGMc","Vue",[1632,2564,1692],{"class":1653},[1632,2566,2567],{"class":1679},"prototype",[1632,2569,1692],{"class":1653},[1632,2571,2572],{"class":1649},"$watch",[1632,2574,1683],{"class":1653},[1632,2576,2577],{"class":1645}," function",[1632,2579,1687],{"class":1653},[1632,2581,2582],{"class":1657},"expOrFn",[1632,2584,1661],{"class":1653},[1632,2586,1946],{"class":1657},[1632,2588,1661],{"class":1653},[1632,2590,1991],{"class":1657},[1632,2592,1667],{"class":1653},[1632,2594,1670],{"class":1653},[1632,2596,2597,2599,2601,2603],{"class":1634,"line":1673},[1632,2598,1676],{"class":1645},[1632,2600,1866],{"class":1679},[1632,2602,1683],{"class":1653},[1632,2604,2605],{"class":1653}," this;\n",[1632,2607,2608,2611,2613,2615,2618],{"class":1634,"line":1719},[1632,2609,2610],{"class":1679},"    options",[1632,2612,1683],{"class":1653},[1632,2614,1991],{"class":1679},[1632,2616,2617],{"class":1653}," ||",[1632,2619,2620],{"class":1653}," {};\n",[1632,2622,2623,2625,2627,2630,2632,2634,2636],{"class":1634,"line":1726},[1632,2624,2610],{"class":1679},[1632,2626,1692],{"class":1653},[1632,2628,2629],{"class":1679},"user",[1632,2631,1683],{"class":1653},[1632,2633,1834],{"class":1833},[1632,2635,2014],{"class":1653},[1632,2637,2638],{"class":1638}," // 标记为用户 Watcher\n",[1632,2640,2641],{"class":1634,"line":1752},[1632,2642,1723],{"emptyLinePlaceholder":1722},[1632,2644,2645,2647,2649,2651,2653,2655,2657,2659,2661,2663,2665,2667,2669,2671,2673],{"class":1634,"line":1776},[1632,2646,1676],{"class":1645},[1632,2648,2173],{"class":1679},[1632,2650,1683],{"class":1653},[1632,2652,1803],{"class":1653},[1632,2654,1806],{"class":1649},[1632,2656,1654],{"class":1686},[1632,2658,1658],{"class":1679},[1632,2660,1661],{"class":1653},[1632,2662,1941],{"class":1679},[1632,2664,1661],{"class":1653},[1632,2666,1946],{"class":1679},[1632,2668,1661],{"class":1653},[1632,2670,1991],{"class":1679},[1632,2672,1667],{"class":1686},[1632,2674,1716],{"class":1653},[1632,2676,2677],{"class":1634,"line":1781},[1632,2678,1723],{"emptyLinePlaceholder":1722},[1632,2680,2681,2683,2685,2688,2690,2693,2695],{"class":1634,"line":1787},[1632,2682,2437],{"class":1729},[1632,2684,1687],{"class":1686},[1632,2686,2687],{"class":1679},"options",[1632,2689,1692],{"class":1653},[1632,2691,2692],{"class":1679},"immediate",[1632,2694,1746],{"class":1686},[1632,2696,1749],{"class":1653},[1632,2698,2699,2702,2704,2707,2709,2711,2713,2715,2717,2719,2721,2723],{"class":1634,"line":1844},[1632,2700,2701],{"class":1679},"        cb",[1632,2703,1692],{"class":1653},[1632,2705,2706],{"class":1649},"call",[1632,2708,1654],{"class":1686},[1632,2710,1658],{"class":1679},[1632,2712,1661],{"class":1653},[1632,2714,2173],{"class":1679},[1632,2716,1692],{"class":1653},[1632,2718,2033],{"class":1679},[1632,2720,1667],{"class":1686},[1632,2722,2014],{"class":1653},[1632,2724,2725],{"class":1638}," // immediate：拿到初始值立刻回调一次\n",[1632,2727,2728],{"class":1634,"line":1849},[1632,2729,1905],{"class":1653},[1632,2731,2732],{"class":1634,"line":1874},[1632,2733,1723],{"emptyLinePlaceholder":1722},[1632,2735,2736,2739,2741,2744,2746],{"class":1634,"line":1896},[1632,2737,2738],{"class":1729},"    return",[1632,2740,2577],{"class":1645},[1632,2742,2743],{"class":1649}," unwatchFn",[1632,2745,2056],{"class":1653},[1632,2747,1670],{"class":1653},[1632,2749,2750,2753,2755,2758,2760,2762],{"class":1634,"line":1902},[1632,2751,2752],{"class":1679},"        watcher",[1632,2754,1692],{"class":1653},[1632,2756,2757],{"class":1649},"teardown",[1632,2759,2056],{"class":1686},[1632,2761,2014],{"class":1653},[1632,2763,2764],{"class":1638}," // 返回取消监听的函数\n",[1632,2766,2767],{"class":1634,"line":1908},[1632,2768,2769],{"class":1653},"    };\n",[1632,2771,2773],{"class":1634,"line":2772},16,[1632,2774,2775],{"class":1653},"};\n",[1531,2777,2778,2779,2782,2783,2786,2787,2790],{},"核心就一行：",[1534,2780,2781],{},"new Watcher(vm, 监听的表达式, 回调)","。创建 Watcher 时会对表达式求值（比如 ",[1534,2784,2785],{},"'a.b'"," 会被解析成取 ",[1534,2788,2789],{},"vm.a.b"," 的函数），求值过程触发响应式数据的 get，依赖就被收集进了这个 Watcher。",[1531,2792,2793,2794,1584],{},"依赖变化时，Watcher 执行 ",[1534,2795,2482],{},[1623,2797,2799],{"className":1625,"code":2798,"language":1627,"meta":1628,"style":1628},"// 简化自 src/core/observer/watcher.js 的 run\nrun() {\n    const value = this.get();\n    const oldValue = this.value;\n    this.value = value;\n\n    if (value !== oldValue || typeof value === 'object') {\n        this.cb.call(this.vm, value, oldValue); // cb(newVal, oldVal)\n    }\n}\n",[1534,2800,2801,2806,2814,2831,2846,2858,2862,2899,2931,2935],{"__ignoreMap":1628},[1632,2802,2803],{"class":1634,"line":1635},[1632,2804,2805],{"class":1638},"// 简化自 src/core/observer/watcher.js 的 run\n",[1632,2807,2808,2810,2812],{"class":1634,"line":1642},[1632,2809,2482],{"class":1649},[1632,2811,2315],{"class":1679},[1632,2813,1749],{"class":1653},[1632,2815,2816,2818,2821,2823,2825,2827,2829],{"class":1634,"line":1673},[1632,2817,1676],{"class":1645},[1632,2819,2820],{"class":1679}," value",[1632,2822,1683],{"class":1653},[1632,2824,2009],{"class":1653},[1632,2826,2053],{"class":1649},[1632,2828,2056],{"class":1686},[1632,2830,1716],{"class":1653},[1632,2832,2833,2835,2838,2840,2842,2844],{"class":1634,"line":1719},[1632,2834,1676],{"class":1645},[1632,2836,2837],{"class":1679}," oldValue",[1632,2839,1683],{"class":1653},[1632,2841,2009],{"class":1653},[1632,2843,2033],{"class":1679},[1632,2845,1716],{"class":1653},[1632,2847,2848,2850,2852,2854,2856],{"class":1634,"line":1726},[1632,2849,1958],{"class":1653},[1632,2851,2033],{"class":1679},[1632,2853,1683],{"class":1653},[1632,2855,2820],{"class":1679},[1632,2857,1716],{"class":1653},[1632,2859,2860],{"class":1634,"line":1752},[1632,2861,1723],{"emptyLinePlaceholder":1722},[1632,2863,2864,2866,2868,2870,2873,2875,2877,2880,2882,2885,2888,2892,2895,2897],{"class":1634,"line":1776},[1632,2865,2437],{"class":1729},[1632,2867,1687],{"class":1686},[1632,2869,2033],{"class":1679},[1632,2871,2872],{"class":1653}," !==",[1632,2874,2837],{"class":1679},[1632,2876,2617],{"class":1653},[1632,2878,2879],{"class":1653}," typeof",[1632,2881,2820],{"class":1679},[1632,2883,2884],{"class":1653}," ===",[1632,2886,2887],{"class":1653}," '",[1632,2889,2891],{"class":2890},"sIEYB","object",[1632,2893,2894],{"class":1653},"'",[1632,2896,1746],{"class":1686},[1632,2898,1749],{"class":1653},[1632,2900,2901,2903,2906,2908,2910,2912,2914,2916,2918,2920,2922,2924,2926,2928],{"class":1634,"line":1781},[1632,2902,2458],{"class":1653},[1632,2904,2905],{"class":1679},"cb",[1632,2907,1692],{"class":1653},[1632,2909,2706],{"class":1649},[1632,2911,1654],{"class":1686},[1632,2913,2442],{"class":1653},[1632,2915,1658],{"class":1679},[1632,2917,1661],{"class":1653},[1632,2919,2820],{"class":1679},[1632,2921,1661],{"class":1653},[1632,2923,2837],{"class":1679},[1632,2925,1667],{"class":1686},[1632,2927,2014],{"class":1653},[1632,2929,2930],{"class":1638}," // cb(newVal, oldVal)\n",[1632,2932,2933],{"class":1634,"line":1787},[1632,2934,1905],{"class":1653},[1632,2936,2937],{"class":1634,"line":1844},[1632,2938,1911],{"class":1653},[1531,2940,2941,2942,2945],{},"新旧值对比，有变化就调用用户回调，并把 ",[1534,2943,2944],{},"(newVal, oldVal)"," 传进去。这就是 watch 回调两个参数的由来。",[1565,2947],{},[1526,2949,2951],{"id":2950},"immediate-与-deep-是怎么做到的","🔍 immediate 与 deep 是怎么做到的",[2953,2954,2956],"h3",{"id":2955},"immediate创建后立刻执行一次","immediate：创建后立刻执行一次",[1531,2958,2959,2960,2962,2963,2965,2966,2969],{},"上面 ",[1534,2961,2572],{}," 的代码里已经看到了：",[1534,2964,2692],{}," 没有任何魔法，就是",[1546,2967,2968],{},"创建 Watcher、拿到初始值之后，立刻用初始值调用一次回调","。它等价于\"watch + 初始化时手动执行一遍同样的逻辑\"。",[2953,2971,2973],{"id":2972},"deep递归遍历触发所有子属性的-get","deep：递归遍历触发所有子属性的 get",[1531,2975,2976,2979,2980,2982],{},[1534,2977,2978],{},"deep"," 的处理在 Watcher 的 ",[1534,2981,2053],{}," 里：",[1623,2984,2986],{"className":1625,"code":2985,"language":1627,"meta":1628,"style":1628},"// 简化自 src/core/observer/watcher.js 的 get\nget() {\n    pushTarget(this); // 把当前 Watcher 挂到 Dep.target\n    let value = this.getter.call(this.vm, this.vm);\n\n    if (this.deep) {\n        traverse(value); // 深度遍历这个值\n    }\n\n    popTarget();\n    return value;\n}\n",[1534,2987,2988,2993,3001,3018,3051,3055,3069,3085,3089,3093,3102,3110],{"__ignoreMap":1628},[1632,2989,2990],{"class":1634,"line":1635},[1632,2991,2992],{"class":1638},"// 简化自 src/core/observer/watcher.js 的 get\n",[1632,2994,2995,2997,2999],{"class":1634,"line":1642},[1632,2996,2053],{"class":1649},[1632,2998,2315],{"class":1679},[1632,3000,1749],{"class":1653},[1632,3002,3003,3006,3008,3011,3013,3015],{"class":1634,"line":1673},[1632,3004,3005],{"class":1649},"    pushTarget",[1632,3007,1654],{"class":1686},[1632,3009,3010],{"class":1653},"this",[1632,3012,1667],{"class":1686},[1632,3014,2014],{"class":1653},[1632,3016,3017],{"class":1638}," // 把当前 Watcher 挂到 Dep.target\n",[1632,3019,3020,3023,3025,3027,3029,3031,3033,3035,3037,3039,3041,3043,3045,3047,3049],{"class":1634,"line":1719},[1632,3021,3022],{"class":1645},"    let",[1632,3024,2820],{"class":1679},[1632,3026,1683],{"class":1653},[1632,3028,2009],{"class":1653},[1632,3030,1973],{"class":1679},[1632,3032,1692],{"class":1653},[1632,3034,2706],{"class":1649},[1632,3036,1654],{"class":1686},[1632,3038,2442],{"class":1653},[1632,3040,1658],{"class":1679},[1632,3042,1661],{"class":1653},[1632,3044,2009],{"class":1653},[1632,3046,1658],{"class":1679},[1632,3048,1667],{"class":1686},[1632,3050,1716],{"class":1653},[1632,3052,3053],{"class":1634,"line":1726},[1632,3054,1723],{"emptyLinePlaceholder":1722},[1632,3056,3057,3059,3061,3063,3065,3067],{"class":1634,"line":1752},[1632,3058,2437],{"class":1729},[1632,3060,1687],{"class":1686},[1632,3062,2442],{"class":1653},[1632,3064,2978],{"class":1679},[1632,3066,1746],{"class":1686},[1632,3068,1749],{"class":1653},[1632,3070,3071,3074,3076,3078,3080,3082],{"class":1634,"line":1776},[1632,3072,3073],{"class":1649},"        traverse",[1632,3075,1654],{"class":1686},[1632,3077,2033],{"class":1679},[1632,3079,1667],{"class":1686},[1632,3081,2014],{"class":1653},[1632,3083,3084],{"class":1638}," // 深度遍历这个值\n",[1632,3086,3087],{"class":1634,"line":1781},[1632,3088,1905],{"class":1653},[1632,3090,3091],{"class":1634,"line":1787},[1632,3092,1723],{"emptyLinePlaceholder":1722},[1632,3094,3095,3098,3100],{"class":1634,"line":1844},[1632,3096,3097],{"class":1649},"    popTarget",[1632,3099,2056],{"class":1686},[1632,3101,1716],{"class":1653},[1632,3103,3104,3106,3108],{"class":1634,"line":1849},[1632,3105,2738],{"class":1729},[1632,3107,2820],{"class":1679},[1632,3109,1716],{"class":1653},[1632,3111,3112],{"class":1634,"line":1874},[1632,3113,1911],{"class":1653},[1531,3115,3116,3119],{},[1534,3117,3118],{},"traverse"," 会递归访问这个对象（或数组）的每一个子属性：",[1623,3121,3123],{"className":1625,"code":3122,"language":1627,"meta":1628,"style":1628},"// 简化自 src/core/observer/traverse.js\nfunction traverse(val, seen = new Set()) {\n    if (typeof val !== 'object' || val === null || seen.has(val)) return;\n\n    seen.add(val); // 用 Set 防止循环引用导致死循环\n\n    if (Array.isArray(val)) {\n        val.forEach((item) => traverse(item, seen));\n    } else {\n        Object.keys(val).forEach((key) => traverse(val[key], seen));\n    }\n}\n",[1534,3124,3125,3130,3160,3209,3213,3234,3238,3260,3296,3304,3354,3358],{"__ignoreMap":1628},[1632,3126,3127],{"class":1634,"line":1635},[1632,3128,3129],{"class":1638},"// 简化自 src/core/observer/traverse.js\n",[1632,3131,3132,3134,3137,3139,3142,3144,3147,3149,3151,3154,3156,3158],{"class":1634,"line":1642},[1632,3133,1646],{"class":1645},[1632,3135,3136],{"class":1649}," traverse",[1632,3138,1654],{"class":1653},[1632,3140,3141],{"class":1657},"val",[1632,3143,1661],{"class":1653},[1632,3145,3146],{"class":1657}," seen",[1632,3148,1683],{"class":1653},[1632,3150,1803],{"class":1653},[1632,3152,3153],{"class":1649}," Set",[1632,3155,2056],{"class":1679},[1632,3157,1667],{"class":1653},[1632,3159,1670],{"class":1653},[1632,3161,3162,3164,3166,3169,3172,3174,3176,3178,3180,3182,3184,3186,3189,3191,3193,3195,3198,3200,3202,3204,3207],{"class":1634,"line":1673},[1632,3163,2437],{"class":1729},[1632,3165,1687],{"class":1686},[1632,3167,3168],{"class":1653},"typeof",[1632,3170,3171],{"class":1679}," val",[1632,3173,2872],{"class":1653},[1632,3175,2887],{"class":1653},[1632,3177,2891],{"class":2890},[1632,3179,2894],{"class":1653},[1632,3181,2617],{"class":1653},[1632,3183,3171],{"class":1679},[1632,3185,2884],{"class":1653},[1632,3187,3188],{"class":1653}," null",[1632,3190,2617],{"class":1653},[1632,3192,3146],{"class":1679},[1632,3194,1692],{"class":1653},[1632,3196,3197],{"class":1649},"has",[1632,3199,1654],{"class":1686},[1632,3201,3141],{"class":1679},[1632,3203,1869],{"class":1686},[1632,3205,3206],{"class":1729},"return",[1632,3208,1716],{"class":1653},[1632,3210,3211],{"class":1634,"line":1719},[1632,3212,1723],{"emptyLinePlaceholder":1722},[1632,3214,3215,3218,3220,3223,3225,3227,3229,3231],{"class":1634,"line":1726},[1632,3216,3217],{"class":1679},"    seen",[1632,3219,1692],{"class":1653},[1632,3221,3222],{"class":1649},"add",[1632,3224,1654],{"class":1686},[1632,3226,3141],{"class":1679},[1632,3228,1667],{"class":1686},[1632,3230,2014],{"class":1653},[1632,3232,3233],{"class":1638}," // 用 Set 防止循环引用导致死循环\n",[1632,3235,3236],{"class":1634,"line":1752},[1632,3237,1723],{"emptyLinePlaceholder":1722},[1632,3239,3240,3242,3244,3247,3249,3252,3254,3256,3258],{"class":1634,"line":1776},[1632,3241,2437],{"class":1729},[1632,3243,1687],{"class":1686},[1632,3245,3246],{"class":1679},"Array",[1632,3248,1692],{"class":1653},[1632,3250,3251],{"class":1649},"isArray",[1632,3253,1654],{"class":1686},[1632,3255,3141],{"class":1679},[1632,3257,1869],{"class":1686},[1632,3259,1749],{"class":1653},[1632,3261,3262,3265,3267,3270,3272,3274,3277,3279,3282,3284,3286,3288,3290,3292,3294],{"class":1634,"line":1781},[1632,3263,3264],{"class":1679},"        val",[1632,3266,1692],{"class":1653},[1632,3268,3269],{"class":1649},"forEach",[1632,3271,1654],{"class":1686},[1632,3273,1654],{"class":1653},[1632,3275,3276],{"class":1657},"item",[1632,3278,1667],{"class":1653},[1632,3280,3281],{"class":1645}," =>",[1632,3283,3136],{"class":1649},[1632,3285,1654],{"class":1686},[1632,3287,3276],{"class":1679},[1632,3289,1661],{"class":1653},[1632,3291,3146],{"class":1679},[1632,3293,1713],{"class":1686},[1632,3295,1716],{"class":1653},[1632,3297,3298,3300,3302],{"class":1634,"line":1787},[1632,3299,2284],{"class":1653},[1632,3301,2473],{"class":1729},[1632,3303,1670],{"class":1653},[1632,3305,3306,3309,3311,3314,3316,3318,3320,3322,3324,3326,3328,3330,3332,3334,3336,3338,3340,3342,3344,3346,3348,3350,3352],{"class":1634,"line":1844},[1632,3307,3308],{"class":1679},"        Object",[1632,3310,1692],{"class":1653},[1632,3312,3313],{"class":1649},"keys",[1632,3315,1654],{"class":1686},[1632,3317,3141],{"class":1679},[1632,3319,1667],{"class":1686},[1632,3321,1692],{"class":1653},[1632,3323,3269],{"class":1649},[1632,3325,1654],{"class":1686},[1632,3327,1654],{"class":1653},[1632,3329,1768],{"class":1657},[1632,3331,1667],{"class":1653},[1632,3333,3281],{"class":1645},[1632,3335,3136],{"class":1649},[1632,3337,1654],{"class":1686},[1632,3339,3141],{"class":1679},[1632,3341,1765],{"class":1686},[1632,3343,1768],{"class":1679},[1632,3345,1771],{"class":1686},[1632,3347,1661],{"class":1653},[1632,3349,3146],{"class":1679},[1632,3351,1713],{"class":1686},[1632,3353,1716],{"class":1653},[1632,3355,3356],{"class":1634,"line":1849},[1632,3357,1905],{"class":1653},[1632,3359,3360],{"class":1634,"line":1874},[1632,3361,1911],{"class":1653},[1531,3363,3364,3365,3368],{},"为什么要递归\"访问\"一遍？因为响应式的 get 会触发依赖收集，",[1546,3366,3367],{},"把每个子属性读一遍，就能让所有子属性的 Dep 都把这个 Watcher 收集进去","。之后任何一个深层属性变化，都能通知到这个 watch。",[1531,3370,3371,3372,3374,3375,2514],{},"代价也很明显：对象越大、嵌套越深，递归遍历和依赖收集的开销就越大。所以 ",[1534,3373,2978],{}," 适合监听结构不大的对象，监听大对象时更推荐直接监听具体路径（如 ",[1534,3376,3377],{},"'form.name'",[1565,3379],{},[1526,3381,3383],{"id":3382},"️-选型建议","⚖️ 选型建议",[1531,3385,3386],{},"理解了实现，选型就不是背结论了：",[1586,3388,3389,3395],{},[1589,3390,3391,3394],{},[1546,3392,3393],{},"模板中由其他数据派生的值，用 computed。"," 它有缓存，依赖不变时重复访问不会重新计算，渲染性能更好。",[1589,3396,3397,3400],{},[1546,3398,3399],{},"数据变化后要执行副作用，用 watch。"," 比如发异步请求、操作 localStorage、执行耗时操作。computed 的 getter 里不适合写副作用，它只应该做纯计算。",[1531,3402,3403],{},"一句话区分：computed 是\"算出一个值\"，watch 是\"值变了做点事\"。",[1565,3405],{},[1526,3407,3409],{"id":3408},"小节总结","🧾 小节总结",[1586,3411,3412,3415,3420,3431,3441],{},[1589,3413,3414],{},"computed 和 watch 底层都是 Watcher，区别只在创建配置。",[1589,3416,3417,3418,2380],{},"computed 对应 lazy Watcher：创建时不求值，首次访问才算，结果缓存在 ",[1534,3419,2372],{},[1589,3421,3422,3423,3425,3426,2504,3428,3430],{},"缓存的本质是 ",[1534,3424,2004],{}," 开关：依赖变化时把 ",[1534,3427,2004],{},[1534,3429,2079],{},"，下次访问才重新计算，而不是立刻重算。",[1589,3432,3433,3434,3437,3438,2380],{},"watch 就是 ",[1534,3435,3436],{},"new Watcher(vm, 表达式, 回调)","，依赖变化时对比新旧值并执行 ",[1534,3439,3440],{},"cb(newVal, oldVal)",[1589,3442,3443,3445,3446,3448,3449,3451],{},[1534,3444,2692],{}," 是创建后立刻用初始值调一次回调；",[1534,3447,2978],{}," 是对值做 ",[1534,3450,3118],{}," 递归遍历，收集所有子属性的依赖，对象越大代价越高。",[1565,3453],{},[1526,3455,3457],{"id":3456},"知识问答","❓ 知识问答",[1531,3459,3460],{},[1546,3461,3462],{},"Q1：computed 依赖的数据变了，为什么没有立刻重新计算？",[1531,3464,3465,3466,2376,3468,3470],{},"A：lazy Watcher 收到通知时只把 ",[1534,3467,2004],{},[1534,3469,2079],{},"，真正的重算推迟到下次访问这个属性时。这样避免了\"算了却没人用\"的浪费。",[1531,3472,3473],{},[1546,3474,3475],{},"Q2：methods 和 computed 在模板里都能返回值，区别在哪？",[1531,3477,3478],{},"A：computed 有缓存，依赖不变时重复访问直接返回缓存值；methods 没有缓存机制，组件每次重新渲染都会把方法重新执行一遍。",[1531,3480,3481],{},[1546,3482,3483],{},"Q3：watch 一个对象，不加 deep 能监听到内部属性变化吗？",[1531,3485,3486,3487,3489],{},"A：不能。不加 deep 时只收集了对象本身的依赖，替换整个对象才会触发；加上 deep 后 ",[1534,3488,3118],{}," 会把所有子属性的 Dep 都收集进来，修改深层属性也能触发。",[1531,3491,3492],{},[1546,3493,3494],{},"Q4：watch 的回调里 newVal 和 oldVal 为什么有时是同一个对象？",[1531,3496,3497,3498,3501],{},"A：监听的是引用类型且内部属性被修改时，新旧值指向同一个对象引用，所以两者内容相同。源码里对引用类型的判断 ",[1534,3499,3500],{},"typeof value === 'object'"," 会让回调照常执行，但传进来的两个值是同一个引用。",[1531,3503,3504],{},[1546,3505,3506],{},"Q5：immediate 和\"watch 外加初始化时手动调一次\"有区别吗？",[1531,3508,3509],{},"A：本质上没有区别，immediate 就是创建 Watcher 拿到初始值后立刻执行一次回调，相当于把这个常用模式内置成了一个选项。",[1565,3511],{},[1526,3513,3515],{"id":3514},"小练习","🧪 小练习",[1531,3517,3518,3519,3521],{},"参照本篇讲的 dirty 缓存思路，用第 4 篇的迷你 Dep / Watcher，补全一个带缓存的 ",[1534,3520,1536],{}," 函数，并用 Node.js v22 运行验证：依赖不变时重复访问不重复执行 getter。",[1623,3523,3526],{"className":1625,"code":3524,"filename":3525,"language":1627,"meta":1628,"style":1628},"// 迷你响应式：带 dirty 缓存的 computed\nclass Dep {\n    constructor() {\n        this.subs = [];\n    }\n    depend() {\n        if (Dep.target && !this.subs.includes(Dep.target)) {\n            this.subs.push(Dep.target);\n        }\n    }\n    notify() {\n        this.subs.forEach((w) => w.update());\n    }\n}\nDep.target = null;\n\nclass Watcher {\n    constructor(getter, { lazy = false } = {}) {\n        this.getter = getter;\n        this.lazy = lazy;\n        this.dirty = lazy;\n        this.value = lazy ? undefined : this.get();\n    }\n    get() {\n        Dep.target = this;\n        const value = this.getter();\n        Dep.target = null;\n        return value;\n    }\n    evaluate() {\n        // 请在这里编写代码：求值并重置 dirty\n    }\n    update() {\n        // 请在这里编写代码：lazy 时只标记 dirty 为 true\n    }\n}\n\nfunction defineReactive(obj, key, val) {\n    const dep = new Dep();\n    Object.defineProperty(obj, key, {\n        get() {\n            dep.depend();\n            return val;\n        },\n        set(newVal) {\n            val = newVal;\n            dep.notify();\n        },\n    });\n}\n\nfunction computed(vm, key, getter) {\n    const watcher = new Watcher(() => getter.call(vm), { lazy: true });\n    Object.defineProperty(vm, key, {\n        get() {\n            // 请在这里编写代码：dirty 为 true 才 evaluate，最后返回 watcher.value\n        },\n    });\n}\n\n// 验证\nconst state = { count: 1 };\ndefineReactive(state, 'count', 1);\n\nconst vm = { state };\ncomputed(vm, 'double', function () {\n    console.log('getter 执行了');\n    return this.state.count * 2;\n});\n\nconsole.log(vm.double); // getter 执行了 → 2\nconsole.log(vm.double); // 命中缓存，不再执行 getter → 2\nstate.count = 10; // 触发 notify，dirty 置回 true\nconsole.log(vm.double); // 重新计算 → 20\n","mini-computed.js",[1534,3527,3528,3533,3543,3552,3566,3570,3579,3617,3641,3645,3649,3658,3691,3695,3699,3713,3717,3726,3754,3767,3780,3793,3818,3823,3833,3847,3864,3877,3887,3892,3902,3908,3913,3923,3929,3934,3939,3944,3969,3987,4008,4017,4032,4042,4047,4061,4074,4088,4093,4102,4107,4112,4135,4182,4203,4212,4218,4223,4232,4237,4242,4248,4272,4298,4303,4319,4344,4368,4390,4400,4405,4427,4447,4467],{"__ignoreMap":1628},[1632,3529,3530],{"class":1634,"line":1635},[1632,3531,3532],{"class":1638},"// 迷你响应式：带 dirty 缓存的 computed\n",[1632,3534,3535,3538,3541],{"class":1634,"line":1642},[1632,3536,3537],{"class":1645},"class",[1632,3539,3540],{"class":2561}," Dep",[1632,3542,1670],{"class":1653},[1632,3544,3545,3548,3550],{"class":1634,"line":1673},[1632,3546,3547],{"class":1645},"    constructor",[1632,3549,2056],{"class":1653},[1632,3551,1670],{"class":1653},[1632,3553,3554,3556,3559,3561,3564],{"class":1634,"line":1719},[1632,3555,2458],{"class":1653},[1632,3557,3558],{"class":1679},"subs",[1632,3560,1683],{"class":1653},[1632,3562,3563],{"class":1686}," []",[1632,3565,1716],{"class":1653},[1632,3567,3568],{"class":1634,"line":1726},[1632,3569,1905],{"class":1653},[1632,3571,3572,3575,3577],{"class":1634,"line":1752},[1632,3573,3574],{"class":1686},"    depend",[1632,3576,2056],{"class":1653},[1632,3578,1670],{"class":1653},[1632,3580,3581,3583,3585,3588,3590,3592,3595,3598,3600,3602,3605,3607,3609,3611,3613,3615],{"class":1634,"line":1776},[1632,3582,1852],{"class":1729},[1632,3584,1687],{"class":1686},[1632,3586,3587],{"class":1679},"Dep",[1632,3589,1692],{"class":1653},[1632,3591,2121],{"class":1679},[1632,3593,3594],{"class":1653}," &&",[1632,3596,3597],{"class":1653}," !this.",[1632,3599,3558],{"class":1679},[1632,3601,1692],{"class":1653},[1632,3603,3604],{"class":1649},"includes",[1632,3606,1654],{"class":1686},[1632,3608,3587],{"class":1679},[1632,3610,1692],{"class":1653},[1632,3612,2121],{"class":1679},[1632,3614,1869],{"class":1686},[1632,3616,1749],{"class":1653},[1632,3618,3619,3622,3624,3626,3629,3631,3633,3635,3637,3639],{"class":1634,"line":1781},[1632,3620,3621],{"class":1653},"            this.",[1632,3623,3558],{"class":1679},[1632,3625,1692],{"class":1653},[1632,3627,3628],{"class":1649},"push",[1632,3630,1654],{"class":1686},[1632,3632,3587],{"class":1679},[1632,3634,1692],{"class":1653},[1632,3636,2121],{"class":1679},[1632,3638,1667],{"class":1686},[1632,3640,1716],{"class":1653},[1632,3642,3643],{"class":1634,"line":1787},[1632,3644,1899],{"class":1653},[1632,3646,3647],{"class":1634,"line":1844},[1632,3648,1905],{"class":1653},[1632,3650,3651,3654,3656],{"class":1634,"line":1849},[1632,3652,3653],{"class":1686},"    notify",[1632,3655,2056],{"class":1653},[1632,3657,1670],{"class":1653},[1632,3659,3660,3662,3664,3666,3668,3670,3672,3675,3677,3679,3682,3684,3686,3689],{"class":1634,"line":1874},[1632,3661,2458],{"class":1653},[1632,3663,3558],{"class":1679},[1632,3665,1692],{"class":1653},[1632,3667,3269],{"class":1649},[1632,3669,1654],{"class":1686},[1632,3671,1654],{"class":1653},[1632,3673,3674],{"class":1657},"w",[1632,3676,1667],{"class":1653},[1632,3678,3281],{"class":1645},[1632,3680,3681],{"class":1679}," w",[1632,3683,1692],{"class":1653},[1632,3685,2413],{"class":1649},[1632,3687,3688],{"class":1686},"())",[1632,3690,1716],{"class":1653},[1632,3692,3693],{"class":1634,"line":1896},[1632,3694,1905],{"class":1653},[1632,3696,3697],{"class":1634,"line":1902},[1632,3698,1911],{"class":1653},[1632,3700,3701,3703,3705,3708,3710],{"class":1634,"line":1908},[1632,3702,3587],{"class":1679},[1632,3704,1692],{"class":1653},[1632,3706,3707],{"class":1679},"target ",[1632,3709,1800],{"class":1653},[1632,3711,3712],{"class":1653}," null;\n",[1632,3714,3715],{"class":1634,"line":2772},[1632,3716,1723],{"emptyLinePlaceholder":1722},[1632,3718,3720,3722,3724],{"class":1634,"line":3719},17,[1632,3721,3537],{"class":1645},[1632,3723,1806],{"class":2561},[1632,3725,1670],{"class":1653},[1632,3727,3729,3731,3733,3735,3737,3739,3741,3743,3745,3747,3749,3752],{"class":1634,"line":3728},18,[1632,3730,3547],{"class":1645},[1632,3732,1654],{"class":1653},[1632,3734,1973],{"class":1657},[1632,3736,1661],{"class":1653},[1632,3738,1824],{"class":1653},[1632,3740,1827],{"class":1657},[1632,3742,1683],{"class":1653},[1632,3744,2347],{"class":1833},[1632,3746,1837],{"class":1653},[1632,3748,1683],{"class":1653},[1632,3750,3751],{"class":1653}," {})",[1632,3753,1670],{"class":1653},[1632,3755,3757,3759,3761,3763,3765],{"class":1634,"line":3756},19,[1632,3758,2458],{"class":1653},[1632,3760,1973],{"class":1679},[1632,3762,1683],{"class":1653},[1632,3764,1758],{"class":1679},[1632,3766,1716],{"class":1653},[1632,3768,3770,3772,3774,3776,3778],{"class":1634,"line":3769},20,[1632,3771,2458],{"class":1653},[1632,3773,1986],{"class":1679},[1632,3775,1683],{"class":1653},[1632,3777,1827],{"class":1679},[1632,3779,1716],{"class":1653},[1632,3781,3783,3785,3787,3789,3791],{"class":1634,"line":3782},21,[1632,3784,2458],{"class":1653},[1632,3786,2004],{"class":1679},[1632,3788,1683],{"class":1653},[1632,3790,1827],{"class":1679},[1632,3792,1716],{"class":1653},[1632,3794,3796,3798,3800,3802,3804,3806,3808,3810,3812,3814,3816],{"class":1634,"line":3795},22,[1632,3797,2458],{"class":1653},[1632,3799,2033],{"class":1679},[1632,3801,1683],{"class":1653},[1632,3803,1827],{"class":1679},[1632,3805,2042],{"class":1653},[1632,3807,2045],{"class":1653},[1632,3809,2048],{"class":1653},[1632,3811,2009],{"class":1653},[1632,3813,2053],{"class":1649},[1632,3815,2056],{"class":1686},[1632,3817,1716],{"class":1653},[1632,3819,3821],{"class":1634,"line":3820},23,[1632,3822,1905],{"class":1653},[1632,3824,3826,3829,3831],{"class":1634,"line":3825},24,[1632,3827,3828],{"class":1686},"    get",[1632,3830,2056],{"class":1653},[1632,3832,1670],{"class":1653},[1632,3834,3836,3839,3841,3843,3845],{"class":1634,"line":3835},25,[1632,3837,3838],{"class":1679},"        Dep",[1632,3840,1692],{"class":1653},[1632,3842,2121],{"class":1679},[1632,3844,1683],{"class":1653},[1632,3846,2605],{"class":1653},[1632,3848,3850,3852,3854,3856,3858,3860,3862],{"class":1634,"line":3849},26,[1632,3851,1755],{"class":1645},[1632,3853,2820],{"class":1679},[1632,3855,1683],{"class":1653},[1632,3857,2009],{"class":1653},[1632,3859,1973],{"class":1649},[1632,3861,2056],{"class":1686},[1632,3863,1716],{"class":1653},[1632,3865,3867,3869,3871,3873,3875],{"class":1634,"line":3866},27,[1632,3868,3838],{"class":1679},[1632,3870,1692],{"class":1653},[1632,3872,2121],{"class":1679},[1632,3874,1683],{"class":1653},[1632,3876,3712],{"class":1653},[1632,3878,3880,3883,3885],{"class":1634,"line":3879},28,[1632,3881,3882],{"class":1729},"        return",[1632,3884,2820],{"class":1679},[1632,3886,1716],{"class":1653},[1632,3888,3890],{"class":1634,"line":3889},29,[1632,3891,1905],{"class":1653},[1632,3893,3895,3898,3900],{"class":1634,"line":3894},30,[1632,3896,3897],{"class":1686},"    evaluate",[1632,3899,2056],{"class":1653},[1632,3901,1670],{"class":1653},[1632,3903,3905],{"class":1634,"line":3904},31,[1632,3906,3907],{"class":1638},"        // 请在这里编写代码：求值并重置 dirty\n",[1632,3909,3911],{"class":1634,"line":3910},32,[1632,3912,1905],{"class":1653},[1632,3914,3916,3919,3921],{"class":1634,"line":3915},33,[1632,3917,3918],{"class":1686},"    update",[1632,3920,2056],{"class":1653},[1632,3922,1670],{"class":1653},[1632,3924,3926],{"class":1634,"line":3925},34,[1632,3927,3928],{"class":1638},"        // 请在这里编写代码：lazy 时只标记 dirty 为 true\n",[1632,3930,3932],{"class":1634,"line":3931},35,[1632,3933,1905],{"class":1653},[1632,3935,3937],{"class":1634,"line":3936},36,[1632,3938,1911],{"class":1653},[1632,3940,3942],{"class":1634,"line":3941},37,[1632,3943,1723],{"emptyLinePlaceholder":1722},[1632,3945,3947,3949,3952,3954,3957,3959,3961,3963,3965,3967],{"class":1634,"line":3946},38,[1632,3948,1646],{"class":1645},[1632,3950,3951],{"class":1649}," defineReactive",[1632,3953,1654],{"class":1653},[1632,3955,3956],{"class":1657},"obj",[1632,3958,1661],{"class":1653},[1632,3960,1738],{"class":1657},[1632,3962,1661],{"class":1653},[1632,3964,3171],{"class":1657},[1632,3966,1667],{"class":1653},[1632,3968,1670],{"class":1653},[1632,3970,3972,3974,3977,3979,3981,3983,3985],{"class":1634,"line":3971},39,[1632,3973,1676],{"class":1645},[1632,3975,3976],{"class":1679}," dep",[1632,3978,1683],{"class":1653},[1632,3980,1803],{"class":1653},[1632,3982,3540],{"class":1649},[1632,3984,2056],{"class":1686},[1632,3986,1716],{"class":1653},[1632,3988,3990,3992,3994,3996,3998,4000,4002,4004,4006],{"class":1634,"line":3989},40,[1632,3991,2139],{"class":1679},[1632,3993,1692],{"class":1653},[1632,3995,2144],{"class":1649},[1632,3997,1654],{"class":1686},[1632,3999,3956],{"class":1679},[1632,4001,1661],{"class":1653},[1632,4003,1738],{"class":1679},[1632,4005,1661],{"class":1653},[1632,4007,1670],{"class":1653},[1632,4009,4011,4013,4015],{"class":1634,"line":4010},41,[1632,4012,2161],{"class":1686},[1632,4014,2056],{"class":1653},[1632,4016,1670],{"class":1653},[1632,4018,4020,4023,4025,4028,4030],{"class":1634,"line":4019},42,[1632,4021,4022],{"class":1679},"            dep",[1632,4024,1692],{"class":1653},[1632,4026,4027],{"class":1649},"depend",[1632,4029,2056],{"class":1686},[1632,4031,1716],{"class":1653},[1632,4033,4035,4038,4040],{"class":1634,"line":4034},43,[1632,4036,4037],{"class":1729},"            return",[1632,4039,3171],{"class":1679},[1632,4041,1716],{"class":1653},[1632,4043,4045],{"class":1634,"line":4044},44,[1632,4046,2269],{"class":1653},[1632,4048,4050,4052,4054,4057,4059],{"class":1634,"line":4049},45,[1632,4051,2274],{"class":1686},[1632,4053,1654],{"class":1653},[1632,4055,4056],{"class":1657},"newVal",[1632,4058,1667],{"class":1653},[1632,4060,1670],{"class":1653},[1632,4062,4064,4067,4069,4072],{"class":1634,"line":4063},46,[1632,4065,4066],{"class":1679},"            val",[1632,4068,1683],{"class":1653},[1632,4070,4071],{"class":1679}," newVal",[1632,4073,1716],{"class":1653},[1632,4075,4077,4079,4081,4084,4086],{"class":1634,"line":4076},47,[1632,4078,4022],{"class":1679},[1632,4080,1692],{"class":1653},[1632,4082,4083],{"class":1649},"notify",[1632,4085,2056],{"class":1686},[1632,4087,1716],{"class":1653},[1632,4089,4091],{"class":1634,"line":4090},48,[1632,4092,2269],{"class":1653},[1632,4094,4096,4098,4100],{"class":1634,"line":4095},49,[1632,4097,2284],{"class":1653},[1632,4099,1667],{"class":1686},[1632,4101,1716],{"class":1653},[1632,4103,4105],{"class":1634,"line":4104},50,[1632,4106,1911],{"class":1653},[1632,4108,4110],{"class":1634,"line":4109},51,[1632,4111,1723],{"emptyLinePlaceholder":1722},[1632,4113,4115,4117,4119,4121,4123,4125,4127,4129,4131,4133],{"class":1634,"line":4114},52,[1632,4116,1646],{"class":1645},[1632,4118,1664],{"class":1649},[1632,4120,1654],{"class":1653},[1632,4122,1658],{"class":1657},[1632,4124,1661],{"class":1653},[1632,4126,1738],{"class":1657},[1632,4128,1661],{"class":1653},[1632,4130,1758],{"class":1657},[1632,4132,1667],{"class":1653},[1632,4134,1670],{"class":1653},[1632,4136,4138,4140,4142,4144,4146,4148,4150,4152,4154,4156,4158,4160,4162,4164,4166,4168,4170,4172,4174,4176,4178,4180],{"class":1634,"line":4137},53,[1632,4139,1676],{"class":1645},[1632,4141,2173],{"class":1679},[1632,4143,1683],{"class":1653},[1632,4145,1803],{"class":1653},[1632,4147,1806],{"class":1649},[1632,4149,1654],{"class":1686},[1632,4151,2056],{"class":1653},[1632,4153,3281],{"class":1645},[1632,4155,1758],{"class":1679},[1632,4157,1692],{"class":1653},[1632,4159,2706],{"class":1649},[1632,4161,1654],{"class":1686},[1632,4163,1658],{"class":1679},[1632,4165,1667],{"class":1686},[1632,4167,1661],{"class":1653},[1632,4169,1824],{"class":1653},[1632,4171,1827],{"class":1686},[1632,4173,1830],{"class":1653},[1632,4175,1834],{"class":1833},[1632,4177,1837],{"class":1653},[1632,4179,1667],{"class":1686},[1632,4181,1716],{"class":1653},[1632,4183,4185,4187,4189,4191,4193,4195,4197,4199,4201],{"class":1634,"line":4184},54,[1632,4186,2139],{"class":1679},[1632,4188,1692],{"class":1653},[1632,4190,2144],{"class":1649},[1632,4192,1654],{"class":1686},[1632,4194,1658],{"class":1679},[1632,4196,1661],{"class":1653},[1632,4198,1738],{"class":1679},[1632,4200,1661],{"class":1653},[1632,4202,1670],{"class":1653},[1632,4204,4206,4208,4210],{"class":1634,"line":4205},55,[1632,4207,2161],{"class":1686},[1632,4209,2056],{"class":1653},[1632,4211,1670],{"class":1653},[1632,4213,4215],{"class":1634,"line":4214},56,[1632,4216,4217],{"class":1638},"            // 请在这里编写代码：dirty 为 true 才 evaluate，最后返回 watcher.value\n",[1632,4219,4221],{"class":1634,"line":4220},57,[1632,4222,2269],{"class":1653},[1632,4224,4226,4228,4230],{"class":1634,"line":4225},58,[1632,4227,2284],{"class":1653},[1632,4229,1667],{"class":1686},[1632,4231,1716],{"class":1653},[1632,4233,4235],{"class":1634,"line":4234},59,[1632,4236,1911],{"class":1653},[1632,4238,4240],{"class":1634,"line":4239},60,[1632,4241,1723],{"emptyLinePlaceholder":1722},[1632,4243,4245],{"class":1634,"line":4244},61,[1632,4246,4247],{"class":1638},"// 验证\n",[1632,4249,4251,4253,4256,4258,4260,4263,4265,4269],{"class":1634,"line":4250},62,[1632,4252,1735],{"class":1645},[1632,4254,4255],{"class":1679}," state ",[1632,4257,1800],{"class":1653},[1632,4259,1824],{"class":1653},[1632,4261,4262],{"class":1686}," count",[1632,4264,1830],{"class":1653},[1632,4266,4268],{"class":4267},"smPcV"," 1",[1632,4270,4271],{"class":1653}," };\n",[1632,4273,4275,4278,4281,4283,4285,4288,4290,4292,4294,4296],{"class":1634,"line":4274},63,[1632,4276,4277],{"class":1649},"defineReactive",[1632,4279,4280],{"class":1679},"(state",[1632,4282,1661],{"class":1653},[1632,4284,2887],{"class":1653},[1632,4286,4287],{"class":2890},"count",[1632,4289,2894],{"class":1653},[1632,4291,1661],{"class":1653},[1632,4293,4268],{"class":4267},[1632,4295,1667],{"class":1679},[1632,4297,1716],{"class":1653},[1632,4299,4301],{"class":1634,"line":4300},64,[1632,4302,1723],{"emptyLinePlaceholder":1722},[1632,4304,4306,4308,4311,4313,4315,4317],{"class":1634,"line":4305},65,[1632,4307,1735],{"class":1645},[1632,4309,4310],{"class":1679}," vm ",[1632,4312,1800],{"class":1653},[1632,4314,1824],{"class":1653},[1632,4316,4255],{"class":1679},[1632,4318,2775],{"class":1653},[1632,4320,4322,4324,4326,4328,4330,4333,4335,4337,4339,4342],{"class":1634,"line":4321},66,[1632,4323,1536],{"class":1649},[1632,4325,1936],{"class":1679},[1632,4327,1661],{"class":1653},[1632,4329,2887],{"class":1653},[1632,4331,4332],{"class":2890},"double",[1632,4334,2894],{"class":1653},[1632,4336,1661],{"class":1653},[1632,4338,2577],{"class":1645},[1632,4340,4341],{"class":1653}," ()",[1632,4343,1670],{"class":1653},[1632,4345,4347,4350,4352,4355,4357,4359,4362,4364,4366],{"class":1634,"line":4346},67,[1632,4348,4349],{"class":1679},"    console",[1632,4351,1692],{"class":1653},[1632,4353,4354],{"class":1649},"log",[1632,4356,1654],{"class":1686},[1632,4358,2894],{"class":1653},[1632,4360,4361],{"class":2890},"getter 执行了",[1632,4363,2894],{"class":1653},[1632,4365,1667],{"class":1686},[1632,4367,1716],{"class":1653},[1632,4369,4371,4373,4375,4378,4380,4382,4385,4388],{"class":1634,"line":4370},68,[1632,4372,2738],{"class":1729},[1632,4374,2009],{"class":1653},[1632,4376,4377],{"class":1679},"state",[1632,4379,1692],{"class":1653},[1632,4381,4287],{"class":1679},[1632,4383,4384],{"class":1653}," *",[1632,4386,4387],{"class":4267}," 2",[1632,4389,1716],{"class":1653},[1632,4391,4393,4396,4398],{"class":1634,"line":4392},69,[1632,4394,4395],{"class":1653},"}",[1632,4397,1667],{"class":1679},[1632,4399,1716],{"class":1653},[1632,4401,4403],{"class":1634,"line":4402},70,[1632,4404,1723],{"emptyLinePlaceholder":1722},[1632,4406,4408,4411,4413,4415,4417,4419,4422,4424],{"class":1634,"line":4407},71,[1632,4409,4410],{"class":1679},"console",[1632,4412,1692],{"class":1653},[1632,4414,4354],{"class":1649},[1632,4416,1936],{"class":1679},[1632,4418,1692],{"class":1653},[1632,4420,4421],{"class":1679},"double)",[1632,4423,2014],{"class":1653},[1632,4425,4426],{"class":1638}," // getter 执行了 → 2\n",[1632,4428,4430,4432,4434,4436,4438,4440,4442,4444],{"class":1634,"line":4429},72,[1632,4431,4410],{"class":1679},[1632,4433,1692],{"class":1653},[1632,4435,4354],{"class":1649},[1632,4437,1936],{"class":1679},[1632,4439,1692],{"class":1653},[1632,4441,4421],{"class":1679},[1632,4443,2014],{"class":1653},[1632,4445,4446],{"class":1638}," // 命中缓存，不再执行 getter → 2\n",[1632,4448,4450,4452,4454,4457,4459,4462,4464],{"class":1634,"line":4449},73,[1632,4451,4377],{"class":1679},[1632,4453,1692],{"class":1653},[1632,4455,4456],{"class":1679},"count ",[1632,4458,1800],{"class":1653},[1632,4460,4461],{"class":4267}," 10",[1632,4463,2014],{"class":1653},[1632,4465,4466],{"class":1638}," // 触发 notify，dirty 置回 true\n",[1632,4468,4470,4472,4474,4476,4478,4480,4482,4484],{"class":1634,"line":4469},74,[1632,4471,4410],{"class":1679},[1632,4473,1692],{"class":1653},[1632,4475,4354],{"class":1649},[1632,4477,1936],{"class":1679},[1632,4479,1692],{"class":1653},[1632,4481,4421],{"class":1679},[1632,4483,2014],{"class":1653},[1632,4485,4486],{"class":1638}," // 重新计算 → 20\n",[1565,4488],{},[1531,4490,4491],{},"🎉 恭喜你已经掌握了 computed 与 watch 的实现原理！从 lazy Watcher 到 dirty 缓存，再到 immediate 和 deep，这些 API 背后的机制其实并不神秘，都是 Watcher 体系的不同配置而已。",[4493,4494,4495],"style",{},"html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .swgpB, html code.shiki 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{color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":1628,"searchDepth":1642,"depth":1642,"links":4497},[4498,4499,4500,4501,4502,4503,4504,4508,4509,4510,4511],{"id":1528,"depth":1642,"text":1529},{"id":1569,"depth":1642,"text":1570},{"id":1613,"depth":1642,"text":1614},{"id":2085,"depth":1642,"text":2086},{"id":2406,"depth":1642,"text":2407},{"id":2533,"depth":1642,"text":2534},{"id":2950,"depth":1642,"text":2951,"children":4505},[4506,4507],{"id":2955,"depth":1673,"text":2956},{"id":2972,"depth":1673,"text":2973},{"id":3382,"depth":1642,"text":3383},{"id":3408,"depth":1642,"text":3409},{"id":3456,"depth":1642,"text":3457},{"id":3514,"depth":1642,"text":3515},"理解 computed 缓存与 watch 监听的内部实现，弄清两者在源码层面的核心区别。","md",null,{},{"title":1415},{"title":1521,"description":4512},"5rOZ8XqQPr",[4520,4522],{"title":1411,"path":1412,"stem":1413,"description":4521,"children":-1},"掌握模板编译 parse、optimize、generate 三个阶段，理解模板到 render 函数的完整转换过程。",{"title":1424,"path":1425,"stem":1426,"description":4523,"children":-1},"了解为什么要读 Vue3 源码，掌握 vuejs/core 仓库的目录结构与本地调试环境的搭建方法。",1784715112002]