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触发更新……但更新谁？\n}\n","js","",[1535,1583,1584,1600,1629,1643,1650],{"__ignoreMap":1581},[1585,1586,1589,1592,1596],"span",{"class":1587,"line":1588},"line",1,[1585,1590,1545],{"class":1591},"swgpB",[1585,1593,1595],{"class":1594},"sndM8","(newVal) ",[1585,1597,1599],{"class":1598},"s86vT","{\n",[1585,1601,1603,1607,1611,1614,1617,1620,1623,1626],{"class":1587,"line":1602},2,[1585,1604,1606],{"class":1605},"s8pZq","    if",[1585,1608,1610],{"class":1609},"sd2Uz"," (",[1585,1612,1613],{"class":1594},"newVal",[1585,1615,1616],{"class":1598}," ===",[1585,1618,1619],{"class":1594}," val",[1585,1621,1622],{"class":1609},") ",[1585,1624,1625],{"class":1605},"return",[1585,1627,1628],{"class":1598},";\n",[1585,1630,1632,1635,1638,1641],{"class":1587,"line":1631},3,[1585,1633,1634],{"class":1594},"    val",[1585,1636,1637],{"class":1598}," =",[1585,1639,1640],{"class":1594}," 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{\n        const subs = this.subs.slice();\n        for (let i = 0; i \u003C subs.length; i++) {\n            subs[i].update();\n        }\n    }\n}\n\nDep.target = null; // 当前正在求值的 Watcher\n",[1535,1745,1746,1751,1769,1775,1793,1803,1820,1839,1845,1850,1868,1889,1894,1899,1909,1928,1952,1958,1963,1968,1978,2003,2045,2069,2074,2079,2084,2089],{"__ignoreMap":1581},[1585,1747,1748],{"class":1587,"line":1588},[1585,1749,1750],{"class":1648},"// 简化自 src/core/observer/dep.js\n",[1585,1752,1753,1757,1760,1763,1767],{"class":1587,"line":1602},[1585,1754,1756],{"class":1755},"s50WR","let",[1585,1758,1759],{"class":1594}," uid ",[1585,1761,1762],{"class":1598},"=",[1585,1764,1766],{"class":1765},"smPcV"," 0",[1585,1768,1628],{"class":1598},[1585,1770,1771],{"class":1587,"line":1631},[1585,1772,1774],{"emptyLinePlaceholder":1773},true,"\n",[1585,1776,1777,1780,1783,1786,1790],{"class":1587,"line":1645},[1585,1778,1779],{"class":1605},"export",[1585,1781,1782],{"class":1605}," default",[1585,1784,1785],{"class":1755}," class",[1585,1787,1789],{"class":1788},"sYGMc"," Dep",[1585,1791,1792],{"class":1598}," {\n",[1585,1794,1795,1798,1801],{"class":1587,"line":1652},[1585,1796,1797],{"class":1755},"    constructor",[1585,1799,1800],{"class":1598},"()",[1585,1802,1792],{"class":1598},[1585,1804,1806,1809,1812,1814,1817],{"class":1587,"line":1805},6,[1585,1807,1808],{"class":1598},"        this.",[1585,1810,1811],{"class":1594},"id",[1585,1813,1637],{"class":1598},[1585,1815,1816],{"class":1594}," uid",[1585,1818,1819],{"class":1598},"++;\n",[1585,1821,1823,1825,1828,1830,1833,1836],{"class":1587,"line":1822},7,[1585,1824,1808],{"class":1598},[1585,1826,1827],{"class":1594},"subs",[1585,1829,1637],{"class":1598},[1585,1831,1832],{"class":1609}," []",[1585,1834,1835],{"class":1598},";",[1585,1837,1838],{"class":1648}," // 订阅者名单（Watcher 数组）\n",[1585,1840,1842],{"class":1587,"line":1841},8,[1585,1843,1844],{"class":1598},"    }\n",[1585,1846,1848],{"class":1587,"line":1847},9,[1585,1849,1774],{"emptyLinePlaceholder":1773},[1585,1851,1853,1856,1859,1863,1866],{"class":1587,"line":1852},10,[1585,1854,1855],{"class":1609},"    addSub",[1585,1857,1858],{"class":1598},"(",[1585,1860,1862],{"class":1861},"sK9QF","sub",[1585,1864,1865],{"class":1598},")",[1585,1867,1792],{"class":1598},[1585,1869,1871,1873,1875,1878,1881,1883,1885,1887],{"class":1587,"line":1870},11,[1585,1872,1808],{"class":1598},[1585,1874,1827],{"class":1594},[1585,1876,1877],{"class":1598},".",[1585,1879,1880],{"class":1591},"push",[1585,1882,1858],{"class":1609},[1585,1884,1862],{"class":1594},[1585,1886,1865],{"class":1609},[1585,1888,1628],{"class":1598},[1585,1890,1892],{"class":1587,"line":1891},12,[1585,1893,1844],{"class":1598},[1585,1895,1897],{"class":1587,"line":1896},13,[1585,1898,1774],{"emptyLinePlaceholder":1773},[1585,1900,1902,1905,1907],{"class":1587,"line":1901},14,[1585,1903,1904],{"class":1609},"    depend",[1585,1906,1800],{"class":1598},[1585,1908,1792],{"class":1598},[1585,1910,1912,1915,1917,1919,1921,1924,1926],{"class":1587,"line":1911},15,[1585,1913,1914],{"class":1605},"        if",[1585,1916,1610],{"class":1609},[1585,1918,1556],{"class":1594},[1585,1920,1877],{"class":1598},[1585,1922,1923],{"class":1594},"target",[1585,1925,1622],{"class":1609},[1585,1927,1599],{"class":1598},[1585,1929,1931,1934,1936,1938,1940,1943,1945,1948,1950],{"class":1587,"line":1930},16,[1585,1932,1933],{"class":1594},"            Dep",[1585,1935,1877],{"class":1598},[1585,1937,1923],{"class":1594},[1585,1939,1877],{"class":1598},[1585,1941,1942],{"class":1591},"addDep",[1585,1944,1858],{"class":1609},[1585,1946,1947],{"class":1598},"this",[1585,1949,1865],{"class":1609},[1585,1951,1628],{"class":1598},[1585,1953,1955],{"class":1587,"line":1954},17,[1585,1956,1957],{"class":1598},"        }\n",[1585,1959,1961],{"class":1587,"line":1960},18,[1585,1962,1844],{"class":1598},[1585,1964,1966],{"class":1587,"line":1965},19,[1585,1967,1774],{"emptyLinePlaceholder":1773},[1585,1969,1971,1974,1976],{"class":1587,"line":1970},20,[1585,1972,1973],{"class":1609},"    notify",[1585,1975,1800],{"class":1598},[1585,1977,1792],{"class":1598},[1585,1979,1981,1984,1987,1989,1992,1994,1996,1999,2001],{"class":1587,"line":1980},21,[1585,1982,1983],{"class":1755},"        const",[1585,1985,1986],{"class":1594}," subs",[1585,1988,1637],{"class":1598},[1585,1990,1991],{"class":1598}," this.",[1585,1993,1827],{"class":1594},[1585,1995,1877],{"class":1598},[1585,1997,1998],{"class":1591},"slice",[1585,2000,1800],{"class":1609},[1585,2002,1628],{"class":1598},[1585,2004,2006,2009,2011,2013,2016,2018,2020,2022,2024,2027,2029,2031,2034,2036,2038,2041,2043],{"class":1587,"line":2005},22,[1585,2007,2008],{"class":1605},"        for",[1585,2010,1610],{"class":1609},[1585,2012,1756],{"class":1755},[1585,2014,2015],{"class":1594}," i",[1585,2017,1637],{"class":1598},[1585,2019,1766],{"class":1765},[1585,2021,1835],{"class":1598},[1585,2023,2015],{"class":1594},[1585,2025,2026],{"class":1598}," \u003C",[1585,2028,1986],{"class":1594},[1585,2030,1877],{"class":1598},[1585,2032,2033],{"class":1594},"length",[1585,2035,1835],{"class":1598},[1585,2037,2015],{"class":1594},[1585,2039,2040],{"class":1598},"++",[1585,2042,1622],{"class":1609},[1585,2044,1599],{"class":1598},[1585,2046,2048,2051,2054,2057,2060,2062,2065,2067],{"class":1587,"line":2047},23,[1585,2049,2050],{"class":1594},"            subs",[1585,2052,2053],{"class":1609},"[",[1585,2055,2056],{"class":1594},"i",[1585,2058,2059],{"class":1609},"]",[1585,2061,1877],{"class":1598},[1585,2063,2064],{"class":1591},"update",[1585,2066,1800],{"class":1609},[1585,2068,1628],{"class":1598},[1585,2070,2072],{"class":1587,"line":2071},24,[1585,2073,1957],{"class":1598},[1585,2075,2077],{"class":1587,"line":2076},25,[1585,2078,1844],{"class":1598},[1585,2080,2082],{"class":1587,"line":2081},26,[1585,2083,1655],{"class":1598},[1585,2085,2087],{"class":1587,"line":2086},27,[1585,2088,1774],{"emptyLinePlaceholder":1773},[1585,2090,2092,2094,2096,2099,2101,2104],{"class":1587,"line":2091},28,[1585,2093,1556],{"class":1594},[1585,2095,1877],{"class":1598},[1585,2097,2098],{"class":1594},"target ",[1585,2100,1762],{"class":1598},[1585,2102,2103],{"class":1598}," null;",[1585,2105,2106],{"class":1648}," // 当前正在求值的 Watcher\n",[1531,2108,2109],{},"逐个方法看：",[1693,2111,2112,2117,2123,2136],{},[1696,2113,2114,2116],{},[1548,2115,1827],{},"：订阅者数组，这个属性被哪些 Watcher 依赖，就存哪些。",[1696,2118,2119,2122],{},[1548,2120,2121],{},"addSub","：把一个 Watcher 加进名单。",[1696,2124,2125,2128,2129,2131,2132,2135],{},[1548,2126,2127],{},"depend","：依赖收集的入口。注意它不直接 ",[1535,2130,2121],{},"，而是反过来调用 ",[1535,2133,2134],{},"Dep.target.addDep(this)","，让 Watcher 主动来登记，原因在下一节讲。",[1696,2137,2138,2141,2142,1682],{},[1548,2139,2140],{},"notify","：数据变了，遍历名单，逐个调用 Watcher 的 ",[1535,2143,2144],{},"update()",[1531,2146,2147,2148,2153,2154,2157],{},"最特殊的是 ",[1548,2149,2150],{},[1535,2151,2152],{},"Dep.target","：它是一个",[1548,2155,2156],{},"静态属性","，全应用共享，指向\"当前正在求值的 Watcher\"。同一时间只有一个 Watcher 在求值，所以用一个全局指针就够了。它是连接 Dep 和 Watcher 的桥梁。",[1563,2159],{},[1526,2161,2163],{"id":2162},"watcher-类一个需要更新的地方","🧱 Watcher 类：一个需要更新的地方",[1531,2165,2166,2167,2170],{},"Watcher 定义在 ",[1535,2168,2169],{},"src/core/observer/watcher.js","。组件渲染、计算属性、用户侦听器，底层都是 Watcher。先看简化版核心：",[1576,2172,2174],{"className":1578,"code":2173,"language":1580,"meta":1581,"style":1581},"// 简化自 src/core/observer/watcher.js\nexport default class Watcher {\n    constructor(vm, expOrFn) {\n        this.vm = vm;\n        this.deps = []; // 自己订阅了哪些 Dep\n        this.getter = expOrFn; // 求值函数，如渲染函数\n        this.value = this.get();\n    }\n\n    get() {\n        pushTarget(this); // Dep.target = 当前 Watcher\n        const value = this.getter.call(this.vm, this.vm);\n        popTarget(); // 求值结束，恢复 Dep.target\n        return value;\n    }\n\n    addDep(dep) {\n        if (!this.deps.includes(dep)) {\n            this.deps.push(dep);\n            dep.addSub(this); // 同时让 Dep 记住自己\n        }\n    }\n\n    update() {\n        this.run();\n    }\n\n    run() {\n        this.value = this.get(); // 重新求值，触发重新渲染\n    }\n}\n",[1535,2175,2176,2181,2194,2213,2226,2242,2258,2275,2279,2283,2292,2308,2343,2355,2364,2368,2372,2386,2411,2430,2450,2454,2458,2462,2471,2482,2486,2490,2499,2519,2524],{"__ignoreMap":1581},[1585,2177,2178],{"class":1587,"line":1588},[1585,2179,2180],{"class":1648},"// 简化自 src/core/observer/watcher.js\n",[1585,2182,2183,2185,2187,2189,2192],{"class":1587,"line":1602},[1585,2184,1779],{"class":1605},[1585,2186,1782],{"class":1605},[1585,2188,1785],{"class":1755},[1585,2190,2191],{"class":1788}," Watcher",[1585,2193,1792],{"class":1598},[1585,2195,2196,2198,2200,2203,2206,2209,2211],{"class":1587,"line":1631},[1585,2197,1797],{"class":1755},[1585,2199,1858],{"class":1598},[1585,2201,2202],{"class":1861},"vm",[1585,2204,2205],{"class":1598},",",[1585,2207,2208],{"class":1861}," expOrFn",[1585,2210,1865],{"class":1598},[1585,2212,1792],{"class":1598},[1585,2214,2215,2217,2219,2221,2224],{"class":1587,"line":1645},[1585,2216,1808],{"class":1598},[1585,2218,2202],{"class":1594},[1585,2220,1637],{"class":1598},[1585,2222,2223],{"class":1594}," vm",[1585,2225,1628],{"class":1598},[1585,2227,2228,2230,2233,2235,2237,2239],{"class":1587,"line":1652},[1585,2229,1808],{"class":1598},[1585,2231,2232],{"class":1594},"deps",[1585,2234,1637],{"class":1598},[1585,2236,1832],{"class":1609},[1585,2238,1835],{"class":1598},[1585,2240,2241],{"class":1648}," // 自己订阅了哪些 Dep\n",[1585,2243,2244,2246,2249,2251,2253,2255],{"class":1587,"line":1805},[1585,2245,1808],{"class":1598},[1585,2247,2248],{"class":1594},"getter",[1585,2250,1637],{"class":1598},[1585,2252,2208],{"class":1594},[1585,2254,1835],{"class":1598},[1585,2256,2257],{"class":1648}," // 求值函数，如渲染函数\n",[1585,2259,2260,2262,2265,2267,2269,2271,2273],{"class":1587,"line":1822},[1585,2261,1808],{"class":1598},[1585,2263,2264],{"class":1594},"value",[1585,2266,1637],{"class":1598},[1585,2268,1991],{"class":1598},[1585,2270,1541],{"class":1591},[1585,2272,1800],{"class":1609},[1585,2274,1628],{"class":1598},[1585,2276,2277],{"class":1587,"line":1841},[1585,2278,1844],{"class":1598},[1585,2280,2281],{"class":1587,"line":1847},[1585,2282,1774],{"emptyLinePlaceholder":1773},[1585,2284,2285,2288,2290],{"class":1587,"line":1852},[1585,2286,2287],{"class":1609},"    get",[1585,2289,1800],{"class":1598},[1585,2291,1792],{"class":1598},[1585,2293,2294,2297,2299,2301,2303,2305],{"class":1587,"line":1870},[1585,2295,2296],{"class":1591},"        pushTarget",[1585,2298,1858],{"class":1609},[1585,2300,1947],{"class":1598},[1585,2302,1865],{"class":1609},[1585,2304,1835],{"class":1598},[1585,2306,2307],{"class":1648}," // Dep.target = 当前 Watcher\n",[1585,2309,2310,2312,2315,2317,2319,2321,2323,2326,2328,2331,2333,2335,2337,2339,2341],{"class":1587,"line":1891},[1585,2311,1983],{"class":1755},[1585,2313,2314],{"class":1594}," value",[1585,2316,1637],{"class":1598},[1585,2318,1991],{"class":1598},[1585,2320,2248],{"class":1594},[1585,2322,1877],{"class":1598},[1585,2324,2325],{"class":1591},"call",[1585,2327,1858],{"class":1609},[1585,2329,2330],{"class":1598},"this.",[1585,2332,2202],{"class":1594},[1585,2334,2205],{"class":1598},[1585,2336,1991],{"class":1598},[1585,2338,2202],{"class":1594},[1585,2340,1865],{"class":1609},[1585,2342,1628],{"class":1598},[1585,2344,2345,2348,2350,2352],{"class":1587,"line":1896},[1585,2346,2347],{"class":1591},"        popTarget",[1585,2349,1800],{"class":1609},[1585,2351,1835],{"class":1598},[1585,2353,2354],{"class":1648}," // 求值结束，恢复 Dep.target\n",[1585,2356,2357,2360,2362],{"class":1587,"line":1901},[1585,2358,2359],{"class":1605},"        return",[1585,2361,2314],{"class":1594},[1585,2363,1628],{"class":1598},[1585,2365,2366],{"class":1587,"line":1911},[1585,2367,1844],{"class":1598},[1585,2369,2370],{"class":1587,"line":1930},[1585,2371,1774],{"emptyLinePlaceholder":1773},[1585,2373,2374,2377,2379,2382,2384],{"class":1587,"line":1954},[1585,2375,2376],{"class":1609},"    addDep",[1585,2378,1858],{"class":1598},[1585,2380,2381],{"class":1861},"dep",[1585,2383,1865],{"class":1598},[1585,2385,1792],{"class":1598},[1585,2387,2388,2390,2392,2395,2397,2399,2402,2404,2406,2409],{"class":1587,"line":1960},[1585,2389,1914],{"class":1605},[1585,2391,1610],{"class":1609},[1585,2393,2394],{"class":1598},"!this.",[1585,2396,2232],{"class":1594},[1585,2398,1877],{"class":1598},[1585,2400,2401],{"class":1591},"includes",[1585,2403,1858],{"class":1609},[1585,2405,2381],{"class":1594},[1585,2407,2408],{"class":1609},")) ",[1585,2410,1599],{"class":1598},[1585,2412,2413,2416,2418,2420,2422,2424,2426,2428],{"class":1587,"line":1965},[1585,2414,2415],{"class":1598},"            this.",[1585,2417,2232],{"class":1594},[1585,2419,1877],{"class":1598},[1585,2421,1880],{"class":1591},[1585,2423,1858],{"class":1609},[1585,2425,2381],{"class":1594},[1585,2427,1865],{"class":1609},[1585,2429,1628],{"class":1598},[1585,2431,2432,2435,2437,2439,2441,2443,2445,2447],{"class":1587,"line":1970},[1585,2433,2434],{"class":1594},"            dep",[1585,2436,1877],{"class":1598},[1585,2438,2121],{"class":1591},[1585,2440,1858],{"class":1609},[1585,2442,1947],{"class":1598},[1585,2444,1865],{"class":1609},[1585,2446,1835],{"class":1598},[1585,2448,2449],{"class":1648}," // 同时让 Dep 记住自己\n",[1585,2451,2452],{"class":1587,"line":1980},[1585,2453,1957],{"class":1598},[1585,2455,2456],{"class":1587,"line":2005},[1585,2457,1844],{"class":1598},[1585,2459,2460],{"class":1587,"line":2047},[1585,2461,1774],{"emptyLinePlaceholder":1773},[1585,2463,2464,2467,2469],{"class":1587,"line":2071},[1585,2465,2466],{"class":1609},"    update",[1585,2468,1800],{"class":1598},[1585,2470,1792],{"class":1598},[1585,2472,2473,2475,2478,2480],{"class":1587,"line":2076},[1585,2474,1808],{"class":1598},[1585,2476,2477],{"class":1591},"run",[1585,2479,1800],{"class":1609},[1585,2481,1628],{"class":1598},[1585,2483,2484],{"class":1587,"line":2081},[1585,2485,1844],{"class":1598},[1585,2487,2488],{"class":1587,"line":2086},[1585,2489,1774],{"emptyLinePlaceholder":1773},[1585,2491,2492,2495,2497],{"class":1587,"line":2091},[1585,2493,2494],{"class":1609},"    run",[1585,2496,1800],{"class":1598},[1585,2498,1792],{"class":1598},[1585,2500,2502,2504,2506,2508,2510,2512,2514,2516],{"class":1587,"line":2501},29,[1585,2503,1808],{"class":1598},[1585,2505,2264],{"class":1594},[1585,2507,1637],{"class":1598},[1585,2509,1991],{"class":1598},[1585,2511,1541],{"class":1591},[1585,2513,1800],{"class":1609},[1585,2515,1835],{"class":1598},[1585,2517,2518],{"class":1648}," // 重新求值，触发重新渲染\n",[1585,2520,2522],{"class":1587,"line":2521},30,[1585,2523,1844],{"class":1598},[1585,2525,2527],{"class":1587,"line":2526},31,[1585,2528,1655],{"class":1598},[1531,2530,2531,2532,2535],{},"关键在 ",[1535,2533,2534],{},"get()"," 里的三步：",[2537,2538,2539,2550,2562],"ol",{},[1696,2540,2541,2546,2547,2549],{},[1548,2542,2543],{},[1535,2544,2545],{},"pushTarget(this)","：把全局的 ",[1535,2548,2152],{}," 设为自己，相当于宣布\"现在开始是我在求值\"。",[1696,2551,2552,2555,2556,2558,2559,2561],{},[1548,2553,2554],{},"执行求值函数","：比如执行渲染函数。渲染过程会访问 ",[1535,2557,1665],{}," 这样的属性，从而触发属性的 ",[1535,2560,1541],{}," 拦截。",[1696,2563,2564,2569,2570,1682],{},[1548,2565,2566],{},[1535,2567,2568],{},"popTarget()","：求值结束，恢复 ",[1535,2571,2152],{},[1531,2573,2574,2576,2577,2580],{},[1535,2575,1942],{}," 则负责登记：Watcher 记住自己订阅了哪些 Dep，同时让 Dep 把自己加进名单。",[1548,2578,2579],{},"登记是双向的","，这为卸载时的清理和去重提供了基础。",[1563,2582],{},[1526,2584,2586],{"id":2585},"依赖收集求值时自动登记","⚡ 依赖收集：求值时自动登记",[1531,2588,2589,2590,2592,2593,2595,2596,2598],{},"现在把 Dep、Watcher 和上一篇的 ",[1535,2591,1537],{}," 拼起来。",[1535,2594,1537],{}," 的 ",[1535,2597,1541],{}," 里其实藏着一行关键代码：",[1576,2600,2602],{"className":1578,"code":2601,"language":1580,"meta":1581,"style":1581},"// 简化自 src/core/observer/index.js 的 defineReactive\nObject.defineProperty(obj, key, {\n    get() {\n        if (Dep.target) {\n            dep.depend(); // 当前有 Watcher 在求值，把它收集进来\n        }\n        return val;\n    },\n    set(newVal) {\n        if (newVal === val) return;\n        val = newVal;\n        dep.notify(); // 变了，通知所有订阅者\n    },\n});\n",[1535,2603,2604,2609,2631,2639,2655,2670,2674,2682,2687,2700,2718,2729,2745,2749],{"__ignoreMap":1581},[1585,2605,2606],{"class":1587,"line":1588},[1585,2607,2608],{"class":1648},"// 简化自 src/core/observer/index.js 的 defineReactive\n",[1585,2610,2611,2614,2616,2619,2622,2624,2627,2629],{"class":1587,"line":1602},[1585,2612,2613],{"class":1594},"Object",[1585,2615,1877],{"class":1598},[1585,2617,2618],{"class":1591},"defineProperty",[1585,2620,2621],{"class":1594},"(obj",[1585,2623,2205],{"class":1598},[1585,2625,2626],{"class":1594}," key",[1585,2628,2205],{"class":1598},[1585,2630,1792],{"class":1598},[1585,2632,2633,2635,2637],{"class":1587,"line":1631},[1585,2634,2287],{"class":1609},[1585,2636,1800],{"class":1598},[1585,2638,1792],{"class":1598},[1585,2640,2641,2643,2645,2647,2649,2651,2653],{"class":1587,"line":1645},[1585,2642,1914],{"class":1605},[1585,2644,1610],{"class":1609},[1585,2646,1556],{"class":1594},[1585,2648,1877],{"class":1598},[1585,2650,1923],{"class":1594},[1585,2652,1622],{"class":1609},[1585,2654,1599],{"class":1598},[1585,2656,2657,2659,2661,2663,2665,2667],{"class":1587,"line":1652},[1585,2658,2434],{"class":1594},[1585,2660,1877],{"class":1598},[1585,2662,2127],{"class":1591},[1585,2664,1800],{"class":1609},[1585,2666,1835],{"class":1598},[1585,2668,2669],{"class":1648}," // 当前有 Watcher 在求值，把它收集进来\n",[1585,2671,2672],{"class":1587,"line":1805},[1585,2673,1957],{"class":1598},[1585,2675,2676,2678,2680],{"class":1587,"line":1822},[1585,2677,2359],{"class":1605},[1585,2679,1619],{"class":1594},[1585,2681,1628],{"class":1598},[1585,2683,2684],{"class":1587,"line":1841},[1585,2685,2686],{"class":1598},"    },\n",[1585,2688,2689,2692,2694,2696,2698],{"class":1587,"line":1847},[1585,2690,2691],{"class":1609},"    set",[1585,2693,1858],{"class":1598},[1585,2695,1613],{"class":1861},[1585,2697,1865],{"class":1598},[1585,2699,1792],{"class":1598},[1585,2701,2702,2704,2706,2708,2710,2712,2714,2716],{"class":1587,"line":1852},[1585,2703,1914],{"class":1605},[1585,2705,1610],{"class":1609},[1585,2707,1613],{"class":1594},[1585,2709,1616],{"class":1598},[1585,2711,1619],{"class":1594},[1585,2713,1622],{"class":1609},[1585,2715,1625],{"class":1605},[1585,2717,1628],{"class":1598},[1585,2719,2720,2723,2725,2727],{"class":1587,"line":1870},[1585,2721,2722],{"class":1594},"        val",[1585,2724,1637],{"class":1598},[1585,2726,1640],{"class":1594},[1585,2728,1628],{"class":1598},[1585,2730,2731,2734,2736,2738,2740,2742],{"class":1587,"line":1891},[1585,2732,2733],{"class":1594},"        dep",[1585,2735,1877],{"class":1598},[1585,2737,2140],{"class":1591},[1585,2739,1800],{"class":1609},[1585,2741,1835],{"class":1598},[1585,2743,2744],{"class":1648}," // 变了，通知所有订阅者\n",[1585,2746,2747],{"class":1587,"line":1896},[1585,2748,2686],{"class":1598},[1585,2750,2751,2754,2756],{"class":1587,"line":1901},[1585,2752,2753],{"class":1598},"}",[1585,2755,1865],{"class":1594},[1585,2757,1628],{"class":1598},[1531,2759,2760],{},"一次完整的依赖收集，按顺序是这样发生的：",[2537,2762,2763,2769,2781,2794,2812],{},[1696,2764,2765,2768],{},[1548,2766,2767],{},"创建渲染 Watcher","：组件挂载时，Vue 为它创建一个 Watcher，求值函数就是渲染函数。",[1696,2770,2771,2774,2775,2777,2778,2780],{},[1548,2772,2773],{},"开始求值","：",[1535,2776,2534],{}," 里 ",[1535,2779,2152],{}," 被设为当前 Watcher。",[1696,2782,2783,2786,2787,2789,2790,2595,2792,2561],{},[1548,2784,2785],{},"访问数据","：渲染函数执行到 ",[1535,2788,1665],{},"，触发 ",[1535,2791,1669],{},[1535,2793,1541],{},[1696,2795,2796,2774,2799,2801,2802,2804,2805,2808,2809,2811],{},[1548,2797,2798],{},"登记",[1535,2800,1541],{}," 里发现 ",[1535,2803,2152],{}," 存在，调用 ",[1535,2806,2807],{},"dep.depend()","，于是 ",[1535,2810,1669],{}," 的 Dep 记住了这个 Watcher，Watcher 也记住了这个 Dep。",[1696,2813,2814,2774,2817,2819],{},[1548,2815,2816],{},"求值结束",[1535,2818,2568],{}," 恢复现场。渲染函数访问过多少属性，就完成了多少次登记。",[1531,2821,2822,2823,2826],{},"整个过程",[1548,2824,2825],{},"不需要手动声明任何依赖","：模板里用到谁，求值时就自动收集谁。这就是\"依赖收集\"四个字的含义。",[1563,2828],{},[1526,2830,2832],{"id":2831},"派发更新按名单逐个通知","⚡ 派发更新：按名单逐个通知",[1531,2834,2835],{},"有了名单，派发更新就是水到渠成的事。当我们执行：",[1576,2837,2839],{"className":1578,"code":2838,"language":1580,"meta":1581,"style":1581},"this.name = '新名字';\n",[1535,2840,2841],{"__ignoreMap":1581},[1585,2842,2843,2845,2848,2850,2853,2857,2860],{"class":1587,"line":1588},[1585,2844,2330],{"class":1598},[1585,2846,2847],{"class":1594},"name ",[1585,2849,1762],{"class":1598},[1585,2851,2852],{"class":1598}," '",[1585,2854,2856],{"class":2855},"sIEYB","新名字",[1585,2858,2859],{"class":1598},"'",[1585,2861,1628],{"class":1598},[1531,2863,2864],{},"链路是这样的：",[2537,2866,2867,2879,2890],{},[1696,2868,2869,2774,2874,2595,2876,2878],{},[1548,2870,2871,2872],{},"触发 ",[1535,2873,1545],{},[1535,2875,1669],{},[1535,2877,1545],{}," 拦截发现值变了。",[1696,2880,2881,2774,2887,2889],{},[1548,2882,2883,2884],{},"调用 ",[1535,2885,2886],{},"dep.notify()",[1535,2888,1669],{}," 的 Dep 拿出自己的订阅名单。",[1696,2891,2892,2897,2898,2901],{},[1548,2893,2894,2895],{},"逐个 ",[1535,2896,2144],{},"：名单上的每个 Watcher 收到通知，本篇的简化版本里直接 ",[1535,2899,2900],{},"run()","，重新执行求值函数，完成重新渲染。",[1531,2903,2904,2905,2908],{},"没用到的组件不在这份名单上，自然不会被惊动。",[1548,2906,2907],{},"精确更新","就是这么来的。",[2910,2911,2912],"tip",{},[1531,2913,2914,2915,2917],{},"真实的 Vue 里 ",[1535,2916,2144],{}," 并不会立刻重新渲染，而是把 Watcher 推进一个队列，等本轮同步代码执行完再统一刷新，避免连续改多个数据导致重复渲染。队列异步更新的细节我们放到下一篇专门讲。",[1563,2919],{},[1526,2921,2923],{"id":2922},"️-多对多关系小结","⚖️ 多对多关系小结",[1531,2925,2926,2927,2930],{},"Dep 和 Watcher 之间是",[1548,2928,2929],{},"多对多","的关系，两个方向都要记住：",[1693,2932,2933,2946],{},[1696,2934,2935,2938,2939,2941,2942,2945],{},[1548,2936,2937],{},"一个 Watcher 依赖多个属性","：渲染函数里用到了 ",[1535,2940,1669],{},"、",[1535,2943,2944],{},"age","，它就同时出现在两个 Dep 的名单里。",[1696,2947,2948,2774,2951,2953],{},[1548,2949,2950],{},"一个属性被多个 Watcher 依赖",[1535,2952,1669],{}," 被头部组件和侧边栏组件同时使用，它的 Dep 名单里就有多个 Watcher。",[1531,2955,2956,2957,2959,2960,2962,2963,2965,2966,2968],{},"正因为是多对多，双方才都要互相登记：Dep 存 ",[1535,2958,1827],{},"，Watcher 存 ",[1535,2961,2232],{},"。组件卸载时，Watcher 就能拿着自己的 ",[1535,2964,2232],{}," 列表，逐个把自己从对方的 ",[1535,2967,1827],{}," 里移除，避免无用的通知。",[1563,2970],{},[1526,2972,2974],{"id":2973},"小节总结","🧾 小节总结",[1693,2976,2977,2989,2995,3005,3020],{},[1696,2978,2979,2980,2982,2983,2985,2986,2988],{},"Dep 是属性的\"订阅名单\"，",[1535,2981,1827],{}," 存订阅者，",[1535,2984,2127],{}," 负责收集，",[1535,2987,2140],{}," 负责通知。",[1696,2990,2991,2992,2994],{},"Watcher 代表\"一个需要更新的地方\"，求值前把 ",[1535,2993,2152],{}," 设为自己，求值中访问属性即被收集。",[1696,2996,2997,2998,3001,3002,3004],{},"依赖收集发生在",[1548,2999,3000],{},"读数据","时：渲染函数访问属性触发 ",[1535,3003,1541],{},"，自动完成登记。",[1696,3006,3007,3008,3011,3012,3014,3015,3017,3018,1682],{},"派发更新发生在",[1548,3009,3010],{},"写数据","时：",[1535,3013,1545],{}," 触发 ",[1535,3016,2140],{},"，按名单逐个调用 ",[1535,3019,2064],{},[1696,3021,3022],{},"Dep 与 Watcher 是多对多关系，双方互相登记，卸载时可精确清理。",[1563,3024],{},[1526,3026,3028],{"id":3027},"知识问答","❓ 知识问答",[1531,3030,3031],{},[1548,3032,3033,3034,3036,3037,3040,3041,3043],{},"Q1：为什么 ",[1535,3035,2127],{}," 里不直接 ",[1535,3038,3039],{},"dep.addSub(Dep.target)","，而是绕一圈调 ",[1535,3042,2134],{},"？",[1531,3045,3046,3047,3049],{},"A：为了让 Watcher 也能记住自己订阅了哪些 Dep。由 Watcher 发起登记，可以同时维护自己的 ",[1535,3048,2232],{}," 列表，并顺便去重，组件卸载时的清理也依赖这份列表。",[1531,3051,3052],{},[1548,3053,3054,3055,3057],{},"Q2：",[1535,3056,2152],{}," 为什么用静态属性而不是传参？",[1531,3059,3060,3061,3063],{},"A：求值函数（如渲染函数）是 Vue 调用业务代码，中间会层层嵌套访问很多属性。用全局指针，任何深度的 ",[1535,3062,1541],{}," 拦截都能拿到\"当前 Watcher\"，不用一路透传参数，代码简洁很多。同一时间只有一个 Watcher 在求值，也保证了安全性。",[1531,3065,3066],{},[1548,3067,3068],{},"Q3：一个属性根本不修改，也会被收集依赖吗？",[1531,3070,3071],{},"A：会。依赖收集只和\"读取\"有关，只要渲染时访问了就会登记。登记成本低，而后续如果真的修改了，就能立刻找到需要更新的人。",[1531,3073,3074],{},[1548,3075,3076,3077,3080],{},"Q4：",[1535,3078,3079],{},"this.name = 'x'"," 之后页面是立刻更新的吗？",[1531,3082,3083,3084,3087],{},"A：不是。真实 Vue 会把 Watcher 放进异步队列，等同步代码跑完再统一刷新，所以修改数据后马上读 DOM 读到的还是旧值，这也是为什么有 ",[1535,3085,3086],{},"this.$nextTick","。本篇的简化代码是同步执行，方便理解主链路。",[1563,3089],{},[1526,3091,3093],{"id":3092},"小练习","🧪 小练习",[1531,3095,3096,3097,3099,3100,3103],{},"在上一篇的迷你 ",[1535,3098,1537],{}," 基础上，补上迷你版 Dep 和 Watcher，让\"修改数据后自动重新执行回调\"跑起来。本地环境：Node.js v22，对照源码版本 vue@2.7.16，代码可直接用 ",[1535,3101,3102],{},"node 文件名.js"," 运行。",[1576,3105,3107],{"className":1578,"code":3106,"language":1580,"meta":1581,"style":1581},"// 简化版 defineReactive（来自上一篇）\nfunction defineReactive(obj, key, val) {\n    const dep = new Dep();\n    Object.defineProperty(obj, key, {\n        get() {\n            if (Dep.target) {\n                dep.depend();\n            }\n            return val;\n        },\n        set(newVal) {\n            if (newVal === val) return;\n            val = newVal;\n            dep.notify();\n        },\n    });\n}\n\nclass Dep {\n    // 请在这里编写代码：subs 数组、addSub、depend、notify\n}\n\nclass Watcher {\n    // 请在这里编写代码：构造时调用 get()，get 里设置 Dep.target 再执行回调\n}\n\n// 验证：回调应打印两次，第二次拿到新值\nconst data = {};\ndefineReactive(data, 'name', '张三');\nnew Watcher(() => console.log('name 变成了：', data.name));\ndata.name = '李四';\n",[1535,3108,3109,3114,3139,3158,3179,3188,3205,3218,3223,3232,3237,3250,3268,3279,3291,3295,3304,3308,3312,3321,3326,3330,3334,3342,3347,3351,3355,3360,3373,3401,3444],{"__ignoreMap":1581},[1585,3110,3111],{"class":1587,"line":1588},[1585,3112,3113],{"class":1648},"// 简化版 defineReactive（来自上一篇）\n",[1585,3115,3116,3119,3122,3124,3127,3129,3131,3133,3135,3137],{"class":1587,"line":1602},[1585,3117,3118],{"class":1755},"function",[1585,3120,3121],{"class":1591}," defineReactive",[1585,3123,1858],{"class":1598},[1585,3125,3126],{"class":1861},"obj",[1585,3128,2205],{"class":1598},[1585,3130,2626],{"class":1861},[1585,3132,2205],{"class":1598},[1585,3134,1619],{"class":1861},[1585,3136,1865],{"class":1598},[1585,3138,1792],{"class":1598},[1585,3140,3141,3144,3147,3149,3152,3154,3156],{"class":1587,"line":1631},[1585,3142,3143],{"class":1755},"    const",[1585,3145,3146],{"class":1594}," dep",[1585,3148,1637],{"class":1598},[1585,3150,3151],{"class":1598}," new",[1585,3153,1789],{"class":1591},[1585,3155,1800],{"class":1609},[1585,3157,1628],{"class":1598},[1585,3159,3160,3163,3165,3167,3169,3171,3173,3175,3177],{"class":1587,"line":1645},[1585,3161,3162],{"class":1594},"    Object",[1585,3164,1877],{"class":1598},[1585,3166,2618],{"class":1591},[1585,3168,1858],{"class":1609},[1585,3170,3126],{"class":1594},[1585,3172,2205],{"class":1598},[1585,3174,2626],{"class":1594},[1585,3176,2205],{"class":1598},[1585,3178,1792],{"class":1598},[1585,3180,3181,3184,3186],{"class":1587,"line":1652},[1585,3182,3183],{"class":1609},"        get",[1585,3185,1800],{"class":1598},[1585,3187,1792],{"class":1598},[1585,3189,3190,3193,3195,3197,3199,3201,3203],{"class":1587,"line":1805},[1585,3191,3192],{"class":1605},"            if",[1585,3194,1610],{"class":1609},[1585,3196,1556],{"class":1594},[1585,3198,1877],{"class":1598},[1585,3200,1923],{"class":1594},[1585,3202,1622],{"class":1609},[1585,3204,1599],{"class":1598},[1585,3206,3207,3210,3212,3214,3216],{"class":1587,"line":1822},[1585,3208,3209],{"class":1594},"                dep",[1585,3211,1877],{"class":1598},[1585,3213,2127],{"class":1591},[1585,3215,1800],{"class":1609},[1585,3217,1628],{"class":1598},[1585,3219,3220],{"class":1587,"line":1841},[1585,3221,3222],{"class":1598},"            }\n",[1585,3224,3225,3228,3230],{"class":1587,"line":1847},[1585,3226,3227],{"class":1605},"            return",[1585,3229,1619],{"class":1594},[1585,3231,1628],{"class":1598},[1585,3233,3234],{"class":1587,"line":1852},[1585,3235,3236],{"class":1598},"        },\n",[1585,3238,3239,3242,3244,3246,3248],{"class":1587,"line":1870},[1585,3240,3241],{"class":1609},"        set",[1585,3243,1858],{"class":1598},[1585,3245,1613],{"class":1861},[1585,3247,1865],{"class":1598},[1585,3249,1792],{"class":1598},[1585,3251,3252,3254,3256,3258,3260,3262,3264,3266],{"class":1587,"line":1891},[1585,3253,3192],{"class":1605},[1585,3255,1610],{"class":1609},[1585,3257,1613],{"class":1594},[1585,3259,1616],{"class":1598},[1585,3261,1619],{"class":1594},[1585,3263,1622],{"class":1609},[1585,3265,1625],{"class":1605},[1585,3267,1628],{"class":1598},[1585,3269,3270,3273,3275,3277],{"class":1587,"line":1896},[1585,3271,3272],{"class":1594},"            val",[1585,3274,1637],{"class":1598},[1585,3276,1640],{"class":1594},[1585,3278,1628],{"class":1598},[1585,3280,3281,3283,3285,3287,3289],{"class":1587,"line":1901},[1585,3282,2434],{"class":1594},[1585,3284,1877],{"class":1598},[1585,3286,2140],{"class":1591},[1585,3288,1800],{"class":1609},[1585,3290,1628],{"class":1598},[1585,3292,3293],{"class":1587,"line":1911},[1585,3294,3236],{"class":1598},[1585,3296,3297,3300,3302],{"class":1587,"line":1930},[1585,3298,3299],{"class":1598},"    }",[1585,3301,1865],{"class":1609},[1585,3303,1628],{"class":1598},[1585,3305,3306],{"class":1587,"line":1954},[1585,3307,1655],{"class":1598},[1585,3309,3310],{"class":1587,"line":1960},[1585,3311,1774],{"emptyLinePlaceholder":1773},[1585,3313,3314,3317,3319],{"class":1587,"line":1965},[1585,3315,3316],{"class":1755},"class",[1585,3318,1789],{"class":1788},[1585,3320,1792],{"class":1598},[1585,3322,3323],{"class":1587,"line":1970},[1585,3324,3325],{"class":1648},"    // 请在这里编写代码：subs 数组、addSub、depend、notify\n",[1585,3327,3328],{"class":1587,"line":1980},[1585,3329,1655],{"class":1598},[1585,3331,3332],{"class":1587,"line":2005},[1585,3333,1774],{"emptyLinePlaceholder":1773},[1585,3335,3336,3338,3340],{"class":1587,"line":2047},[1585,3337,3316],{"class":1755},[1585,3339,2191],{"class":1788},[1585,3341,1792],{"class":1598},[1585,3343,3344],{"class":1587,"line":2071},[1585,3345,3346],{"class":1648},"    // 请在这里编写代码：构造时调用 get()，get 里设置 Dep.target 再执行回调\n",[1585,3348,3349],{"class":1587,"line":2076},[1585,3350,1655],{"class":1598},[1585,3352,3353],{"class":1587,"line":2081},[1585,3354,1774],{"emptyLinePlaceholder":1773},[1585,3356,3357],{"class":1587,"line":2086},[1585,3358,3359],{"class":1648},"// 验证：回调应打印两次，第二次拿到新值\n",[1585,3361,3362,3365,3368,3370],{"class":1587,"line":2091},[1585,3363,3364],{"class":1755},"const",[1585,3366,3367],{"class":1594}," data ",[1585,3369,1762],{"class":1598},[1585,3371,3372],{"class":1598}," {};\n",[1585,3374,3375,3377,3380,3382,3384,3386,3388,3390,3392,3395,3397,3399],{"class":1587,"line":2501},[1585,3376,1537],{"class":1591},[1585,3378,3379],{"class":1594},"(data",[1585,3381,2205],{"class":1598},[1585,3383,2852],{"class":1598},[1585,3385,1669],{"class":2855},[1585,3387,2859],{"class":1598},[1585,3389,2205],{"class":1598},[1585,3391,2852],{"class":1598},[1585,3393,3394],{"class":2855},"张三",[1585,3396,2859],{"class":1598},[1585,3398,1865],{"class":1594},[1585,3400,1628],{"class":1598},[1585,3402,3403,3406,3408,3410,3412,3415,3418,3420,3423,3425,3427,3430,3432,3434,3437,3439,3442],{"class":1587,"line":2521},[1585,3404,3405],{"class":1598},"new",[1585,3407,2191],{"class":1591},[1585,3409,1858],{"class":1594},[1585,3411,1800],{"class":1598},[1585,3413,3414],{"class":1755}," =>",[1585,3416,3417],{"class":1594}," console",[1585,3419,1877],{"class":1598},[1585,3421,3422],{"class":1591},"log",[1585,3424,1858],{"class":1594},[1585,3426,2859],{"class":1598},[1585,3428,3429],{"class":2855},"name 变成了：",[1585,3431,2859],{"class":1598},[1585,3433,2205],{"class":1598},[1585,3435,3436],{"class":1594}," data",[1585,3438,1877],{"class":1598},[1585,3440,3441],{"class":1594},"name))",[1585,3443,1628],{"class":1598},[1585,3445,3446,3449,3451,3453,3455,3457,3460,3462],{"class":1587,"line":2526},[1585,3447,3448],{"class":1594},"data",[1585,3450,1877],{"class":1598},[1585,3452,2847],{"class":1594},[1585,3454,1762],{"class":1598},[1585,3456,2852],{"class":1598},[1585,3458,3459],{"class":2855},"李四",[1585,3461,2859],{"class":1598},[1585,3463,1628],{"class":1598},[1531,3465,3466,3467,3470,3471,1682],{},"提示：Dep 类约 15 行，Watcher 类约 15 行，加上静态属性 ",[1535,3468,3469],{},"Dep.target = null"," 即可。写完后运行，第二次打印应该是 ",[1535,3472,3473],{},"name 变成了：李四",[1563,3475],{},[1531,3477,3478],{},"🎉 恭喜你已经掌握 Dep 与 Watcher 的分工啦！响应式的主链路已经完整：拦截感知变化、Dep 管名单、Watcher 管更新。下一篇我们看 Vue 如何用异步队列把多次修改合并成一次渲染，把性能再往上推一步。",[3480,3481,3482],"style",{},"html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .syuKq, html code.shiki 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.sK9QF{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}",{"title":1581,"searchDepth":1602,"depth":1602,"links":3484},[3485,3486,3487,3488,3489,3490,3491,3492,3493,3494,3495],{"id":1528,"depth":1602,"text":1529},{"id":1567,"depth":1602,"text":1568},{"id":1687,"depth":1602,"text":1688},{"id":1732,"depth":1602,"text":1733},{"id":2162,"depth":1602,"text":2163},{"id":2585,"depth":1602,"text":2586},{"id":2831,"depth":1602,"text":2832},{"id":2922,"depth":1602,"text":2923},{"id":2973,"depth":1602,"text":2974},{"id":3027,"depth":1602,"text":3028},{"id":3092,"depth":1602,"text":3093},"理解 Dep 与 Watcher 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