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是:",[1670,1778,1712],{"class":1684},[1670,1780,1781],{"class":1684},",",[1670,1783,1784],{"class":1680}," obj",[1670,1786,1766],{"class":1684},[1670,1788,1789],{"class":1680},"name",[1670,1791,1718],{"class":1698},[1670,1793,1721],{"class":1684},[1670,1795,1797,1800,1802],{"class":1672,"line":1796},7,[1670,1798,1799],{"class":1684},"}",[1670,1801,1718],{"class":1680},[1670,1803,1721],{"class":1684},[1531,1805,1806],{},"这个流程和订阅报纸很像：你先订阅一次（执行函数，顺便登记），之后报纸一更新（数据变化），就自动送报给你（重新执行），不用你每天自己去问。",[1531,1808,1809,1810,1650,1813,1815,1816,1818],{},"接下来的问题是：函数执行期间，Vue 怎么知道「正在执行的是哪个 effect」？靠一个全局变量 ",[1535,1811,1812],{},"activeEffect",[1535,1814,1596],{}," 执行你的函数之前，先把自己存进 ",[1535,1817,1812],{},"，执行完再清空。这样，函数执行期间任何数据被读取，都能通过这个变量找到「当前是谁在读我」：",[1661,1820,1822],{"className":1663,"code":1821,"language":1665,"meta":1666,"style":1666},"// 简化自 packages/reactivity/src/effect.ts\n\n// 全局变量：指向当前正在执行的 effect\nlet activeEffect = null;\n\nfunction effect(fn) {\n    // 把传入的函数包装成一个带 run 方法的 effect 对象\n    const _effect = {\n        fn,\n        run() {\n            try {\n                // 执行前：把 activeEffect 指向自己\n                activeEffect = _effect;\n                return fn(); // 执行用户的函数\n            } finally {\n                // 执行后：不管成功失败，都清空 activeEffect\n                activeEffect = null;\n            }\n        },\n    };\n\n    _effect.run(); // 立即执行一次，顺便完成第一次登记\n    return _effect;\n}\n",[1535,1823,1824,1829,1833,1838,1851,1855,1873,1878,1892,1901,1911,1920,1926,1938,1955,1966,1972,1981,1987,1993,1999,2004,2022,2032],{"__ignoreMap":1666},[1670,1825,1826],{"class":1672,"line":1673},[1670,1827,1828],{"class":1750},"// 简化自 packages/reactivity/src/effect.ts\n",[1670,1830,1831],{"class":1672,"line":1724},[1670,1832,1728],{"emptyLinePlaceholder":1727},[1670,1834,1835],{"class":1672,"line":1731},[1670,1836,1837],{"class":1750},"// 全局变量：指向当前正在执行的 effect\n",[1670,1839,1840,1843,1846,1848],{"class":1672,"line":1747},[1670,1841,1842],{"class":1676},"let",[1670,1844,1845],{"class":1680}," activeEffect ",[1670,1847,1685],{"class":1684},[1670,1849,1850],{"class":1684}," null;\n",[1670,1852,1853],{"class":1672,"line":1754},[1670,1854,1728],{"emptyLinePlaceholder":1727},[1670,1856,1857,1860,1863,1865,1869,1871],{"class":1672,"line":1760},[1670,1858,1859],{"class":1676},"function",[1670,1861,1862],{"class":1688}," effect",[1670,1864,1692],{"class":1684},[1670,1866,1868],{"class":1867},"sK9QF","fn",[1670,1870,1718],{"class":1684},[1670,1872,1744],{"class":1684},[1670,1874,1875],{"class":1672,"line":1796},[1670,1876,1877],{"class":1750},"    // 把传入的函数包装成一个带 run 方法的 effect 对象\n",[1670,1879,1881,1884,1887,1890],{"class":1672,"line":1880},8,[1670,1882,1883],{"class":1676},"    const",[1670,1885,1886],{"class":1680}," _effect",[1670,1888,1889],{"class":1684}," =",[1670,1891,1744],{"class":1684},[1670,1893,1895,1898],{"class":1672,"line":1894},9,[1670,1896,1897],{"class":1680},"        fn",[1670,1899,1900],{"class":1684},",\n",[1670,1902,1904,1907,1909],{"class":1672,"line":1903},10,[1670,1905,1906],{"class":1698},"        run",[1670,1908,1738],{"class":1684},[1670,1910,1744],{"class":1684},[1670,1912,1914,1918],{"class":1672,"line":1913},11,[1670,1915,1917],{"class":1916},"s8pZq","            try",[1670,1919,1744],{"class":1684},[1670,1921,1923],{"class":1672,"line":1922},12,[1670,1924,1925],{"class":1750},"                // 执行前：把 activeEffect 指向自己\n",[1670,1927,1929,1932,1934,1936],{"class":1672,"line":1928},13,[1670,1930,1931],{"class":1680},"                activeEffect",[1670,1933,1889],{"class":1684},[1670,1935,1886],{"class":1680},[1670,1937,1721],{"class":1684},[1670,1939,1941,1944,1947,1949,1952],{"class":1672,"line":1940},14,[1670,1942,1943],{"class":1916},"                return",[1670,1945,1946],{"class":1688}," fn",[1670,1948,1738],{"class":1698},[1670,1950,1951],{"class":1684},";",[1670,1953,1954],{"class":1750}," // 执行用户的函数\n",[1670,1956,1958,1961,1964],{"class":1672,"line":1957},15,[1670,1959,1960],{"class":1684},"            }",[1670,1962,1963],{"class":1916}," finally",[1670,1965,1744],{"class":1684},[1670,1967,1969],{"class":1672,"line":1968},16,[1670,1970,1971],{"class":1750},"                // 执行后：不管成功失败，都清空 activeEffect\n",[1670,1973,1975,1977,1979],{"class":1672,"line":1974},17,[1670,1976,1931],{"class":1680},[1670,1978,1889],{"class":1684},[1670,1980,1850],{"class":1684},[1670,1982,1984],{"class":1672,"line":1983},18,[1670,1985,1986],{"class":1684},"            }\n",[1670,1988,1990],{"class":1672,"line":1989},19,[1670,1991,1992],{"class":1684},"        },\n",[1670,1994,1996],{"class":1672,"line":1995},20,[1670,1997,1998],{"class":1684},"    };\n",[1670,2000,2002],{"class":1672,"line":2001},21,[1670,2003,1728],{"emptyLinePlaceholder":1727},[1670,2005,2007,2010,2012,2015,2017,2019],{"class":1672,"line":2006},22,[1670,2008,2009],{"class":1680},"    _effect",[1670,2011,1766],{"class":1684},[1670,2013,2014],{"class":1688},"run",[1670,2016,1738],{"class":1698},[1670,2018,1951],{"class":1684},[1670,2020,2021],{"class":1750}," // 立即执行一次，顺便完成第一次登记\n",[1670,2023,2025,2028,2030],{"class":1672,"line":2024},23,[1670,2026,2027],{"class":1916},"    return",[1670,2029,1886],{"class":1680},[1670,2031,1721],{"class":1684},[1670,2033,2035],{"class":1672,"line":2034},24,[1670,2036,2037],{"class":1684},"}\n",[1531,2039,2040,2041,2043,2044,1650],{},"注意 ",[1535,2042,2014],{}," 里的三步：先登记自己、再执行、最后清空。这就是整个依赖收集的开关：",[1570,2045,2046,2047,2049],{},"只有 ",[1535,2048,1812],{}," 有值的时候，读取数据才会被记录",[1635,2051],{},[1526,2053,2055],{"id":2054},"targetmap记录存在哪","🧱 targetMap：记录存在哪",[1531,2057,2058],{},"上一节说了要「记录」，那这份记录具体存在哪里？这一节就来回答这个问题。",[1531,2060,2061,2062,2065,2066,2069],{},"Vue3 准备了一个全局容器 ",[1535,2063,2064],{},"targetMap","，它只有一句话的功能：",[1570,2067,2068],{},"记住「哪个对象的哪个属性，被哪些 effect 使用」","。为了做到这一点，它里面套了三层：",[1661,2071,2073],{"className":1663,"code":2072,"language":1665,"meta":1666,"style":1666},"// 简化自 packages/reactivity/src/dep.ts\nconst targetMap = new WeakMap();\n\n// 三层结构，从外到内：\n// 第一层：按「对象」存，比如 obj\n// 第二层：按「属性名」存，比如 'name'、'age'\n// 第三层：存所有读过这个属性的 effect\n",[1535,2074,2075,2080,2099,2103,2108,2113,2118],{"__ignoreMap":1666},[1670,2076,2077],{"class":1672,"line":1673},[1670,2078,2079],{"class":1750},"// 简化自 packages/reactivity/src/dep.ts\n",[1670,2081,2082,2084,2087,2089,2092,2095,2097],{"class":1672,"line":1724},[1670,2083,1677],{"class":1676},[1670,2085,2086],{"class":1680}," targetMap ",[1670,2088,1685],{"class":1684},[1670,2090,2091],{"class":1684}," new",[1670,2093,2094],{"class":1688}," WeakMap",[1670,2096,1738],{"class":1680},[1670,2098,1721],{"class":1684},[1670,2100,2101],{"class":1672,"line":1731},[1670,2102,1728],{"emptyLinePlaceholder":1727},[1670,2104,2105],{"class":1672,"line":1747},[1670,2106,2107],{"class":1750},"// 三层结构，从外到内：\n",[1670,2109,2110],{"class":1672,"line":1754},[1670,2111,2112],{"class":1750},"// 第一层：按「对象」存，比如 obj\n",[1670,2114,2115],{"class":1672,"line":1760},[1670,2116,2117],{"class":1750},"// 第二层：按「属性名」存，比如 'name'、'age'\n",[1670,2119,2120],{"class":1672,"line":1796},[1670,2121,2122],{"class":1750},"// 第三层：存所有读过这个属性的 effect\n",[1531,2124,2125,2126,2129,2130,2133,2134,1606,2136,2129,2139,2142,2143,2145],{},"光看文字有点抽象，我们画一张图。假设 ",[1535,2127,2128],{},"obj = reactive({ name: 'noxussj', age: 18 })","，",[1535,2131,2132],{},"effect1"," 读了 ",[1535,2135,1789],{},[1535,2137,2138],{},"age",[1535,2140,2141],{},"effect2"," 只读了 ",[1535,2144,1789],{},"，那记录长这样：",[1661,2147,2151],{"className":2148,"code":2149,"language":2150,"meta":1666,"style":1666},"language-txt shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","targetMap\n└── obj（第一层：按对象存）\n    ├── 'name' → effect1、effect2（第二层按属性名存，第三层是 effect 集合）\n    └── 'age'  → effect1\n","txt",[1535,2152,2153,2158,2163,2168],{"__ignoreMap":1666},[1670,2154,2155],{"class":1672,"line":1673},[1670,2156,2157],{},"targetMap\n",[1670,2159,2160],{"class":1672,"line":1724},[1670,2161,2162],{},"└── obj（第一层：按对象存）\n",[1670,2164,2165],{"class":1672,"line":1731},[1670,2166,2167],{},"    ├── 'name' → effect1、effect2（第二层按属性名存，第三层是 effect 集合）\n",[1670,2169,2170],{"class":1672,"line":1747},[1670,2171,2172],{},"    └── 'age'  → effect1\n",[1531,2174,2175,2176,2179,2180,1606,2182,2184],{},"这样，以后 ",[1535,2177,2178],{},"obj.name"," 一变，Vue 查表就知道要通知 ",[1535,2181,2132],{},[1535,2183,2141],{},"。三层各用一种容器，也不是随便选的：",[1564,2186,2187,2196,2214],{},[1567,2188,2189,2195],{},[1570,2190,2191,2192],{},"第一层用 ",[1535,2193,2194],{},"WeakMap","：它对 key 是「弱引用」，意思是它不拦着垃圾回收。垃圾回收就是 JS 自动清理没人用的内存的机制。如果某个响应式对象没有任何地方再用了，它会被自动回收，对应的整条依赖记录也会一起消失，不会白白占着内存。",[1567,2197,2198,2204,2205,2207,2208,2210,2211,2213],{},[1570,2199,2200,2201],{},"第二层用 ",[1535,2202,2203],{},"Map","：按属性名分组，这样更新可以精确到属性。",[1535,2206,2178],{}," 变了，只通知读了 ",[1535,2209,1789],{}," 的 effect，不会误伤读了 ",[1535,2212,2138],{}," 的。",[1567,2215,2216,2222,2223,2225,2226,2228],{},[1570,2217,2218,2219],{},"第三层用 ",[1535,2220,2221],{},"Set","：",[1535,2224,2221],{}," 的特点是自动去重。同一个 effect 在函数里读两次 ",[1535,2227,2178],{},"，也只会被登记一次，通知时不会重复执行。",[2230,2231,2232],"tip",{},[1531,2233,2234,2235,2237,2238,1650],{},"可以对照 Vue2 理解：Vue2 是「每个属性一个 Dep 实例，Dep 里存 Watcher 数组」；Vue3 改成了一张全局的 ",[1535,2236,2064],{}," 表，按需查表。思路一致，只是存储方式不同。Vue2 的写法可以回看 ",[2239,2240,2241],"a",{"href":1386},"Vue2 源码课程",[1635,2243],{},[1526,2245,2247],{"id":2246},"track把谁在用我记下来","🧱 track：把「谁在用我」记下来",[1531,2249,2250,2251,2254,2255,2257,2258,1650],{},"记录的结构想清楚了，接下来的问题是：登记动作在哪一刻发生？答案是",[1570,2252,2253],{},"读取数据的那一刻","，也就是上一篇 ",[1535,2256,1541],{}," 拦截器里调用的 ",[1535,2259,1552],{},[1531,2261,2262,2264,2265,2274],{},[1535,2263,1552],{}," 干的事一句话就能说完：",[1570,2266,2267,2268,2270,2271,2273],{},"把当前正在执行的 effect（也就是 ",[1535,2269,1812],{},"），加进「这个对象的这个属性」对应的 ",[1535,2272,2221],{}," 里","。三层结构可能有缺层，它就沿着三层逐级查找，缺哪层建哪层：",[1661,2276,2278],{"className":1663,"code":2277,"language":1665,"meta":1666,"style":1666},"// 简化自 packages/reactivity/src/dep.ts\nfunction track(target, key) {\n    // activeEffect 为空：说明这次读取不在任何 effect 里，不用收集\n    if (!activeEffect) return;\n\n    // 第一层：找这个对象对应的 Map，没有就新建\n    let depsMap = targetMap.get(target);\n    if (!depsMap) {\n        depsMap = new Map();\n        targetMap.set(target, depsMap);\n    }\n\n    // 第二层：找这个属性对应的 Set，没有就新建\n    let dep = depsMap.get(key);\n    if (!dep) {\n        dep = new Set();\n        depsMap.set(key, dep);\n    }\n\n    // 第三层：把当前 effect 加进去（Set 自动去重）\n    dep.add(activeEffect);\n}\n",[1535,2279,2280,2284,2305,2310,2331,2335,2340,2365,2381,2397,2418,2423,2427,2432,2456,2471,2487,2507,2511,2515,2520,2538],{"__ignoreMap":1666},[1670,2281,2282],{"class":1672,"line":1673},[1670,2283,2079],{"class":1750},[1670,2285,2286,2288,2291,2293,2296,2298,2301,2303],{"class":1672,"line":1724},[1670,2287,1859],{"class":1676},[1670,2289,2290],{"class":1688}," track",[1670,2292,1692],{"class":1684},[1670,2294,2295],{"class":1867},"target",[1670,2297,1781],{"class":1684},[1670,2299,2300],{"class":1867}," key",[1670,2302,1718],{"class":1684},[1670,2304,1744],{"class":1684},[1670,2306,2307],{"class":1672,"line":1731},[1670,2308,2309],{"class":1750},"    // activeEffect 为空：说明这次读取不在任何 effect 里，不用收集\n",[1670,2311,2312,2315,2318,2321,2323,2326,2329],{"class":1672,"line":1747},[1670,2313,2314],{"class":1916},"    if",[1670,2316,2317],{"class":1698}," (",[1670,2319,2320],{"class":1684},"!",[1670,2322,1812],{"class":1680},[1670,2324,2325],{"class":1698},") ",[1670,2327,2328],{"class":1916},"return",[1670,2330,1721],{"class":1684},[1670,2332,2333],{"class":1672,"line":1754},[1670,2334,1728],{"emptyLinePlaceholder":1727},[1670,2336,2337],{"class":1672,"line":1760},[1670,2338,2339],{"class":1750},"    // 第一层：找这个对象对应的 Map，没有就新建\n",[1670,2341,2342,2345,2348,2350,2353,2355,2357,2359,2361,2363],{"class":1672,"line":1796},[1670,2343,2344],{"class":1676},"    let",[1670,2346,2347],{"class":1680}," depsMap",[1670,2349,1889],{"class":1684},[1670,2351,2352],{"class":1680}," targetMap",[1670,2354,1766],{"class":1684},[1670,2356,1541],{"class":1688},[1670,2358,1692],{"class":1698},[1670,2360,2295],{"class":1680},[1670,2362,1718],{"class":1698},[1670,2364,1721],{"class":1684},[1670,2366,2367,2369,2371,2373,2376,2378],{"class":1672,"line":1880},[1670,2368,2314],{"class":1916},[1670,2370,2317],{"class":1698},[1670,2372,2320],{"class":1684},[1670,2374,2375],{"class":1680},"depsMap",[1670,2377,2325],{"class":1698},[1670,2379,2380],{"class":1684},"{\n",[1670,2382,2383,2386,2388,2390,2393,2395],{"class":1672,"line":1894},[1670,2384,2385],{"class":1680},"        depsMap",[1670,2387,1889],{"class":1684},[1670,2389,2091],{"class":1684},[1670,2391,2392],{"class":1688}," Map",[1670,2394,1738],{"class":1698},[1670,2396,1721],{"class":1684},[1670,2398,2399,2402,2404,2406,2408,2410,2412,2414,2416],{"class":1672,"line":1903},[1670,2400,2401],{"class":1680},"        targetMap",[1670,2403,1766],{"class":1684},[1670,2405,1545],{"class":1688},[1670,2407,1692],{"class":1698},[1670,2409,2295],{"class":1680},[1670,2411,1781],{"class":1684},[1670,2413,2347],{"class":1680},[1670,2415,1718],{"class":1698},[1670,2417,1721],{"class":1684},[1670,2419,2420],{"class":1672,"line":1913},[1670,2421,2422],{"class":1684},"    }\n",[1670,2424,2425],{"class":1672,"line":1922},[1670,2426,1728],{"emptyLinePlaceholder":1727},[1670,2428,2429],{"class":1672,"line":1928},[1670,2430,2431],{"class":1750},"    // 第二层：找这个属性对应的 Set，没有就新建\n",[1670,2433,2434,2436,2439,2441,2443,2445,2447,2449,2452,2454],{"class":1672,"line":1940},[1670,2435,2344],{"class":1676},[1670,2437,2438],{"class":1680}," dep",[1670,2440,1889],{"class":1684},[1670,2442,2347],{"class":1680},[1670,2444,1766],{"class":1684},[1670,2446,1541],{"class":1688},[1670,2448,1692],{"class":1698},[1670,2450,2451],{"class":1680},"key",[1670,2453,1718],{"class":1698},[1670,2455,1721],{"class":1684},[1670,2457,2458,2460,2462,2464,2467,2469],{"class":1672,"line":1957},[1670,2459,2314],{"class":1916},[1670,2461,2317],{"class":1698},[1670,2463,2320],{"class":1684},[1670,2465,2466],{"class":1680},"dep",[1670,2468,2325],{"class":1698},[1670,2470,2380],{"class":1684},[1670,2472,2473,2476,2478,2480,2483,2485],{"class":1672,"line":1968},[1670,2474,2475],{"class":1680},"        dep",[1670,2477,1889],{"class":1684},[1670,2479,2091],{"class":1684},[1670,2481,2482],{"class":1688}," Set",[1670,2484,1738],{"class":1698},[1670,2486,1721],{"class":1684},[1670,2488,2489,2491,2493,2495,2497,2499,2501,2503,2505],{"class":1672,"line":1974},[1670,2490,2385],{"class":1680},[1670,2492,1766],{"class":1684},[1670,2494,1545],{"class":1688},[1670,2496,1692],{"class":1698},[1670,2498,2451],{"class":1680},[1670,2500,1781],{"class":1684},[1670,2502,2438],{"class":1680},[1670,2504,1718],{"class":1698},[1670,2506,1721],{"class":1684},[1670,2508,2509],{"class":1672,"line":1983},[1670,2510,2422],{"class":1684},[1670,2512,2513],{"class":1672,"line":1989},[1670,2514,1728],{"emptyLinePlaceholder":1727},[1670,2516,2517],{"class":1672,"line":1995},[1670,2518,2519],{"class":1750},"    // 第三层：把当前 effect 加进去（Set 自动去重）\n",[1670,2521,2522,2525,2527,2530,2532,2534,2536],{"class":1672,"line":2001},[1670,2523,2524],{"class":1680},"    dep",[1670,2526,1766],{"class":1684},[1670,2528,2529],{"class":1688},"add",[1670,2531,1692],{"class":1698},[1670,2533,1812],{"class":1680},[1670,2535,1718],{"class":1698},[1670,2537,1721],{"class":1684},[1670,2539,2540],{"class":1672,"line":2006},[1670,2541,2037],{"class":1684},[1531,2543,2544,2545,2548,2549,2552,2553,2555],{},"整个函数就做一件事：",[1570,2546,2547],{},"「谁在执行期间读了我，就把谁记下来」","。开头那句 ",[1535,2550,2551],{},"if (!activeEffect) return"," 很关键：如果某次读取发生在 effect 之外，比如普通函数里随手打印一下 ",[1535,2554,2178],{},"，说明没有人在「订阅」这个数据，直接跳过，不浪费内存。",[1635,2557],{},[1526,2559,2561],{"id":2560},"trigger逐个通知","🧱 trigger：逐个通知",[1531,2563,2564,2565,2257,2567,1650],{},"有登记就有通知。这一节回答：数据被修改后，Vue 怎么把消息送到？这就是 ",[1535,2566,1545],{},[1535,2568,1558],{},[1531,2570,2571,2573,2574,2576,2577,2222],{},[1535,2572,1558],{}," 是 ",[1535,2575,1552],{}," 的反向操作：",[1570,2578,2579,2580,2582],{},"查出「这个对象的这个属性」对应的 ",[1535,2581,2221],{},"，把里面的 effect 逐个重新执行",[1661,2584,2586],{"className":1663,"code":2585,"language":1665,"meta":1666,"style":1666},"// 简化自 packages/reactivity/src/dep.ts\nfunction trigger(target, key) {\n    // 第一层：找这个对象对应的 Map，没有说明没人依赖它\n    const depsMap = targetMap.get(target);\n    if (!depsMap) return;\n\n    // 第二层：找这个属性对应的 Set\n    const dep = depsMap.get(key);\n    if (!dep) return;\n\n    // 第三层：复制一份，逐个重新执行\n    new Set(dep).forEach((effect) => {\n        effect.run();\n    });\n}\n",[1535,2587,2588,2592,2611,2616,2638,2654,2658,2663,2685,2701,2705,2710,2740,2753,2762],{"__ignoreMap":1666},[1670,2589,2590],{"class":1672,"line":1673},[1670,2591,2079],{"class":1750},[1670,2593,2594,2596,2599,2601,2603,2605,2607,2609],{"class":1672,"line":1724},[1670,2595,1859],{"class":1676},[1670,2597,2598],{"class":1688}," trigger",[1670,2600,1692],{"class":1684},[1670,2602,2295],{"class":1867},[1670,2604,1781],{"class":1684},[1670,2606,2300],{"class":1867},[1670,2608,1718],{"class":1684},[1670,2610,1744],{"class":1684},[1670,2612,2613],{"class":1672,"line":1731},[1670,2614,2615],{"class":1750},"    // 第一层：找这个对象对应的 Map，没有说明没人依赖它\n",[1670,2617,2618,2620,2622,2624,2626,2628,2630,2632,2634,2636],{"class":1672,"line":1747},[1670,2619,1883],{"class":1676},[1670,2621,2347],{"class":1680},[1670,2623,1889],{"class":1684},[1670,2625,2352],{"class":1680},[1670,2627,1766],{"class":1684},[1670,2629,1541],{"class":1688},[1670,2631,1692],{"class":1698},[1670,2633,2295],{"class":1680},[1670,2635,1718],{"class":1698},[1670,2637,1721],{"class":1684},[1670,2639,2640,2642,2644,2646,2648,2650,2652],{"class":1672,"line":1754},[1670,2641,2314],{"class":1916},[1670,2643,2317],{"class":1698},[1670,2645,2320],{"class":1684},[1670,2647,2375],{"class":1680},[1670,2649,2325],{"class":1698},[1670,2651,2328],{"class":1916},[1670,2653,1721],{"class":1684},[1670,2655,2656],{"class":1672,"line":1760},[1670,2657,1728],{"emptyLinePlaceholder":1727},[1670,2659,2660],{"class":1672,"line":1796},[1670,2661,2662],{"class":1750},"    // 第二层：找这个属性对应的 Set\n",[1670,2664,2665,2667,2669,2671,2673,2675,2677,2679,2681,2683],{"class":1672,"line":1880},[1670,2666,1883],{"class":1676},[1670,2668,2438],{"class":1680},[1670,2670,1889],{"class":1684},[1670,2672,2347],{"class":1680},[1670,2674,1766],{"class":1684},[1670,2676,1541],{"class":1688},[1670,2678,1692],{"class":1698},[1670,2680,2451],{"class":1680},[1670,2682,1718],{"class":1698},[1670,2684,1721],{"class":1684},[1670,2686,2687,2689,2691,2693,2695,2697,2699],{"class":1672,"line":1894},[1670,2688,2314],{"class":1916},[1670,2690,2317],{"class":1698},[1670,2692,2320],{"class":1684},[1670,2694,2466],{"class":1680},[1670,2696,2325],{"class":1698},[1670,2698,2328],{"class":1916},[1670,2700,1721],{"class":1684},[1670,2702,2703],{"class":1672,"line":1903},[1670,2704,1728],{"emptyLinePlaceholder":1727},[1670,2706,2707],{"class":1672,"line":1913},[1670,2708,2709],{"class":1750},"    // 第三层：复制一份，逐个重新执行\n",[1670,2711,2712,2715,2717,2719,2721,2723,2725,2728,2730,2732,2734,2736,2738],{"class":1672,"line":1922},[1670,2713,2714],{"class":1684},"    new",[1670,2716,2482],{"class":1688},[1670,2718,1692],{"class":1698},[1670,2720,2466],{"class":1680},[1670,2722,1718],{"class":1698},[1670,2724,1766],{"class":1684},[1670,2726,2727],{"class":1688},"forEach",[1670,2729,1692],{"class":1698},[1670,2731,1692],{"class":1684},[1670,2733,1596],{"class":1867},[1670,2735,1718],{"class":1684},[1670,2737,1741],{"class":1676},[1670,2739,1744],{"class":1684},[1670,2741,2742,2745,2747,2749,2751],{"class":1672,"line":1928},[1670,2743,2744],{"class":1680},"        effect",[1670,2746,1766],{"class":1684},[1670,2748,2014],{"class":1688},[1670,2750,1738],{"class":1698},[1670,2752,1721],{"class":1684},[1670,2754,2755,2758,2760],{"class":1672,"line":1940},[1670,2756,2757],{"class":1684},"    }",[1670,2759,1718],{"class":1698},[1670,2761,1721],{"class":1684},[1670,2763,2764],{"class":1672,"line":1957},[1670,2765,2037],{"class":1684},[1531,2767,2768,2769,2776,2777,2779,2780,2782],{},"这里有个容易忽略的细节：",[1570,2770,2771,2772,2775],{},"遍历时先 ",[1535,2773,2774],{},"new Set(dep)"," 复制一份","。为什么要复制？因为 effect 重新执行时会再次读取数据，又会触发 ",[1535,2778,1552],{}," 往同一个 ",[1535,2781,2221],{}," 里加记录。边遍历边往里加东西，可能导致死循环。复制一份再遍历，就不会出问题。",[1531,2784,2785,2786,2788,2789,2792],{},"而「重跑时又触发 ",[1535,2787,1552],{},"」恰恰是这套系统的巧妙之处：",[1570,2790,2791],{},"每次重跑都会重新收集一次依赖","，记录永远和最新的实际情况保持一致。",[1635,2794],{},[1526,2796,2798],{"id":2797},"串起完整链路","🧱 串起完整链路",[1531,2800,2801,2802,2804],{},"前面几节分别讲了登记的人、登记的地方、登记的动作、通知的动作。这一节把它们和上一篇的 ",[1535,2803,1537],{}," 拼起来，组成一套能直接运行的迷你响应式系统：",[1661,2806,2809],{"className":1663,"code":2807,"filename":2808,"language":1665,"meta":1666,"style":1666},"// ===== 上一篇的 reactive（用 Proxy 拦截读写）=====\nfunction reactive(target) {\n    return new Proxy(target, {\n        get(target, key, receiver) {\n            const result = Reflect.get(target, key, receiver);\n            track(target, key); // 读取时：收集依赖\n            return result;\n        },\n        set(target, key, value, receiver) {\n            const result = Reflect.set(target, key, value, receiver);\n            trigger(target, key); // 修改时：触发更新\n            return result;\n        },\n    });\n}\n\n// ===== 本篇的 effect / track / trigger =====\nconst targetMap = new WeakMap(); // 存放所有依赖记录\nlet activeEffect = null; // 当前正在执行的 effect\n\nfunction effect(fn) {\n    const _effect = {\n        fn,\n        run() {\n            try {\n                activeEffect = _effect; // 登记自己\n                return fn();\n            } finally {\n                activeEffect = null; // 执行完清空\n            }\n        },\n    };\n    _effect.run(); // 立即执行一次\n    return _effect;\n}\n\nfunction track(target, key) {\n    if (!activeEffect) return; // 没有正在执行的 effect，不用收集\n    let depsMap = targetMap.get(target);\n    if (!depsMap) {\n        depsMap = new Map();\n        targetMap.set(target, depsMap);\n    }\n    let dep = depsMap.get(key);\n    if (!dep) {\n        dep = new Set();\n        depsMap.set(key, dep);\n    }\n    dep.add(activeEffect); // 把当前 effect 加进去\n}\n\nfunction trigger(target, key) {\n    const depsMap = targetMap.get(target);\n    if (!depsMap) return;\n    const dep = depsMap.get(key);\n    if (!dep) return;\n    new Set(dep).forEach((effect) => {\n        effect.run(); // 逐个重新执行\n    });\n}\n\n// ===== 实际使用 =====\nconst obj = reactive({ name: 'noxussj' });\n\neffect(() => {\n    console.log('name 是:', obj.name);\n});\n// 打印：name 是: noxussj（effect 立即执行一次）\n\nobj.name = '小明';\n// 打印：name 是: 小明（trigger 通知 effect 自动重跑）\n","demo.js",[1535,2810,2811,2816,2830,2847,2869,2902,2922,2931,2935,2961,2995,3015,3023,3027,3035,3039,3043,3048,3067,3081,3085,3099,3109,3115,3123,3130,3144,3155,3164,3176,3181,3186,3191,3207,3216,3221,3226,3245,3265,3288,3303,3318,3339,3344,3367,3382,3397,3418,3423,3443,3448,3453,3472,3495,3512,3535,3552,3581,3597,3606,3611,3616,3622,3653,3658,3671,3700,3709,3715,3720,3742],{"__ignoreMap":1666},[1670,2812,2813],{"class":1672,"line":1673},[1670,2814,2815],{"class":1750},"// ===== 上一篇的 reactive（用 Proxy 拦截读写）=====\n",[1670,2817,2818,2820,2822,2824,2826,2828],{"class":1672,"line":1724},[1670,2819,1859],{"class":1676},[1670,2821,1689],{"class":1688},[1670,2823,1692],{"class":1684},[1670,2825,2295],{"class":1867},[1670,2827,1718],{"class":1684},[1670,2829,1744],{"class":1684},[1670,2831,2832,2834,2836,2839,2841,2843,2845],{"class":1672,"line":1731},[1670,2833,2027],{"class":1916},[1670,2835,2091],{"class":1684},[1670,2837,2838],{"class":1688}," Proxy",[1670,2840,1692],{"class":1698},[1670,2842,2295],{"class":1680},[1670,2844,1781],{"class":1684},[1670,2846,1744],{"class":1684},[1670,2848,2849,2852,2854,2856,2858,2860,2862,2865,2867],{"class":1672,"line":1747},[1670,2850,2851],{"class":1698},"        get",[1670,2853,1692],{"class":1684},[1670,2855,2295],{"class":1867},[1670,2857,1781],{"class":1684},[1670,2859,2300],{"class":1867},[1670,2861,1781],{"class":1684},[1670,2863,2864],{"class":1867}," receiver",[1670,2866,1718],{"class":1684},[1670,2868,1744],{"class":1684},[1670,2870,2871,2874,2877,2879,2882,2884,2886,2888,2890,2892,2894,2896,2898,2900],{"class":1672,"line":1754},[1670,2872,2873],{"class":1676},"            const",[1670,2875,2876],{"class":1680}," result",[1670,2878,1889],{"class":1684},[1670,2880,2881],{"class":1680}," Reflect",[1670,2883,1766],{"class":1684},[1670,2885,1541],{"class":1688},[1670,2887,1692],{"class":1698},[1670,2889,2295],{"class":1680},[1670,2891,1781],{"class":1684},[1670,2893,2300],{"class":1680},[1670,2895,1781],{"class":1684},[1670,2897,2864],{"class":1680},[1670,2899,1718],{"class":1698},[1670,2901,1721],{"class":1684},[1670,2903,2904,2907,2909,2911,2913,2915,2917,2919],{"class":1672,"line":1760},[1670,2905,2906],{"class":1688},"            track",[1670,2908,1692],{"class":1698},[1670,2910,2295],{"class":1680},[1670,2912,1781],{"class":1684},[1670,2914,2300],{"class":1680},[1670,2916,1718],{"class":1698},[1670,2918,1951],{"class":1684},[1670,2920,2921],{"class":1750}," // 读取时：收集依赖\n",[1670,2923,2924,2927,2929],{"class":1672,"line":1796},[1670,2925,2926],{"class":1916},"            return",[1670,2928,2876],{"class":1680},[1670,2930,1721],{"class":1684},[1670,2932,2933],{"class":1672,"line":1880},[1670,2934,1992],{"class":1684},[1670,2936,2937,2940,2942,2944,2946,2948,2950,2953,2955,2957,2959],{"class":1672,"line":1894},[1670,2938,2939],{"class":1698},"        set",[1670,2941,1692],{"class":1684},[1670,2943,2295],{"class":1867},[1670,2945,1781],{"class":1684},[1670,2947,2300],{"class":1867},[1670,2949,1781],{"class":1684},[1670,2951,2952],{"class":1867}," value",[1670,2954,1781],{"class":1684},[1670,2956,2864],{"class":1867},[1670,2958,1718],{"class":1684},[1670,2960,1744],{"class":1684},[1670,2962,2963,2965,2967,2969,2971,2973,2975,2977,2979,2981,2983,2985,2987,2989,2991,2993],{"class":1672,"line":1903},[1670,2964,2873],{"class":1676},[1670,2966,2876],{"class":1680},[1670,2968,1889],{"class":1684},[1670,2970,2881],{"class":1680},[1670,2972,1766],{"class":1684},[1670,2974,1545],{"class":1688},[1670,2976,1692],{"class":1698},[1670,2978,2295],{"class":1680},[1670,2980,1781],{"class":1684},[1670,2982,2300],{"class":1680},[1670,2984,1781],{"class":1684},[1670,2986,2952],{"class":1680},[1670,2988,1781],{"class":1684},[1670,2990,2864],{"class":1680},[1670,2992,1718],{"class":1698},[1670,2994,1721],{"class":1684},[1670,2996,2997,3000,3002,3004,3006,3008,3010,3012],{"class":1672,"line":1913},[1670,2998,2999],{"class":1688},"            trigger",[1670,3001,1692],{"class":1698},[1670,3003,2295],{"class":1680},[1670,3005,1781],{"class":1684},[1670,3007,2300],{"class":1680},[1670,3009,1718],{"class":1698},[1670,3011,1951],{"class":1684},[1670,3013,3014],{"class":1750}," // 修改时：触发更新\n",[1670,3016,3017,3019,3021],{"class":1672,"line":1922},[1670,3018,2926],{"class":1916},[1670,3020,2876],{"class":1680},[1670,3022,1721],{"class":1684},[1670,3024,3025],{"class":1672,"line":1928},[1670,3026,1992],{"class":1684},[1670,3028,3029,3031,3033],{"class":1672,"line":1940},[1670,3030,2757],{"class":1684},[1670,3032,1718],{"class":1698},[1670,3034,1721],{"class":1684},[1670,3036,3037],{"class":1672,"line":1957},[1670,3038,2037],{"class":1684},[1670,3040,3041],{"class":1672,"line":1968},[1670,3042,1728],{"emptyLinePlaceholder":1727},[1670,3044,3045],{"class":1672,"line":1974},[1670,3046,3047],{"class":1750},"// ===== 本篇的 effect / track / trigger =====\n",[1670,3049,3050,3052,3054,3056,3058,3060,3062,3064],{"class":1672,"line":1983},[1670,3051,1677],{"class":1676},[1670,3053,2086],{"class":1680},[1670,3055,1685],{"class":1684},[1670,3057,2091],{"class":1684},[1670,3059,2094],{"class":1688},[1670,3061,1738],{"class":1680},[1670,3063,1951],{"class":1684},[1670,3065,3066],{"class":1750}," // 存放所有依赖记录\n",[1670,3068,3069,3071,3073,3075,3078],{"class":1672,"line":1989},[1670,3070,1842],{"class":1676},[1670,3072,1845],{"class":1680},[1670,3074,1685],{"class":1684},[1670,3076,3077],{"class":1684}," null;",[1670,3079,3080],{"class":1750}," // 当前正在执行的 effect\n",[1670,3082,3083],{"class":1672,"line":1995},[1670,3084,1728],{"emptyLinePlaceholder":1727},[1670,3086,3087,3089,3091,3093,3095,3097],{"class":1672,"line":2001},[1670,3088,1859],{"class":1676},[1670,3090,1862],{"class":1688},[1670,3092,1692],{"class":1684},[1670,3094,1868],{"class":1867},[1670,3096,1718],{"class":1684},[1670,3098,1744],{"class":1684},[1670,3100,3101,3103,3105,3107],{"class":1672,"line":2006},[1670,3102,1883],{"class":1676},[1670,3104,1886],{"class":1680},[1670,3106,1889],{"class":1684},[1670,3108,1744],{"class":1684},[1670,3110,3111,3113],{"class":1672,"line":2024},[1670,3112,1897],{"class":1680},[1670,3114,1900],{"class":1684},[1670,3116,3117,3119,3121],{"class":1672,"line":2034},[1670,3118,1906],{"class":1698},[1670,3120,1738],{"class":1684},[1670,3122,1744],{"class":1684},[1670,3124,3126,3128],{"class":1672,"line":3125},25,[1670,3127,1917],{"class":1916},[1670,3129,1744],{"class":1684},[1670,3131,3133,3135,3137,3139,3141],{"class":1672,"line":3132},26,[1670,3134,1931],{"class":1680},[1670,3136,1889],{"class":1684},[1670,3138,1886],{"class":1680},[1670,3140,1951],{"class":1684},[1670,3142,3143],{"class":1750}," // 登记自己\n",[1670,3145,3147,3149,3151,3153],{"class":1672,"line":3146},27,[1670,3148,1943],{"class":1916},[1670,3150,1946],{"class":1688},[1670,3152,1738],{"class":1698},[1670,3154,1721],{"class":1684},[1670,3156,3158,3160,3162],{"class":1672,"line":3157},28,[1670,3159,1960],{"class":1684},[1670,3161,1963],{"class":1916},[1670,3163,1744],{"class":1684},[1670,3165,3167,3169,3171,3173],{"class":1672,"line":3166},29,[1670,3168,1931],{"class":1680},[1670,3170,1889],{"class":1684},[1670,3172,3077],{"class":1684},[1670,3174,3175],{"class":1750}," // 执行完清空\n",[1670,3177,3179],{"class":1672,"line":3178},30,[1670,3180,1986],{"class":1684},[1670,3182,3184],{"class":1672,"line":3183},31,[1670,3185,1992],{"class":1684},[1670,3187,3189],{"class":1672,"line":3188},32,[1670,3190,1998],{"class":1684},[1670,3192,3194,3196,3198,3200,3202,3204],{"class":1672,"line":3193},33,[1670,3195,2009],{"class":1680},[1670,3197,1766],{"class":1684},[1670,3199,2014],{"class":1688},[1670,3201,1738],{"class":1698},[1670,3203,1951],{"class":1684},[1670,3205,3206],{"class":1750}," // 立即执行一次\n",[1670,3208,3210,3212,3214],{"class":1672,"line":3209},34,[1670,3211,2027],{"class":1916},[1670,3213,1886],{"class":1680},[1670,3215,1721],{"class":1684},[1670,3217,3219],{"class":1672,"line":3218},35,[1670,3220,2037],{"class":1684},[1670,3222,3224],{"class":1672,"line":3223},36,[1670,3225,1728],{"emptyLinePlaceholder":1727},[1670,3227,3229,3231,3233,3235,3237,3239,3241,3243],{"class":1672,"line":3228},37,[1670,3230,1859],{"class":1676},[1670,3232,2290],{"class":1688},[1670,3234,1692],{"class":1684},[1670,3236,2295],{"class":1867},[1670,3238,1781],{"class":1684},[1670,3240,2300],{"class":1867},[1670,3242,1718],{"class":1684},[1670,3244,1744],{"class":1684},[1670,3246,3248,3250,3252,3254,3256,3258,3260,3262],{"class":1672,"line":3247},38,[1670,3249,2314],{"class":1916},[1670,3251,2317],{"class":1698},[1670,3253,2320],{"class":1684},[1670,3255,1812],{"class":1680},[1670,3257,2325],{"class":1698},[1670,3259,2328],{"class":1916},[1670,3261,1951],{"class":1684},[1670,3263,3264],{"class":1750}," // 没有正在执行的 effect，不用收集\n",[1670,3266,3268,3270,3272,3274,3276,3278,3280,3282,3284,3286],{"class":1672,"line":3267},39,[1670,3269,2344],{"class":1676},[1670,3271,2347],{"class":1680},[1670,3273,1889],{"class":1684},[1670,3275,2352],{"class":1680},[1670,3277,1766],{"class":1684},[1670,3279,1541],{"class":1688},[1670,3281,1692],{"class":1698},[1670,3283,2295],{"class":1680},[1670,3285,1718],{"class":1698},[1670,3287,1721],{"class":1684},[1670,3289,3291,3293,3295,3297,3299,3301],{"class":1672,"line":3290},40,[1670,3292,2314],{"class":1916},[1670,3294,2317],{"class":1698},[1670,3296,2320],{"class":1684},[1670,3298,2375],{"class":1680},[1670,3300,2325],{"class":1698},[1670,3302,2380],{"class":1684},[1670,3304,3306,3308,3310,3312,3314,3316],{"class":1672,"line":3305},41,[1670,3307,2385],{"class":1680},[1670,3309,1889],{"class":1684},[1670,3311,2091],{"class":1684},[1670,3313,2392],{"class":1688},[1670,3315,1738],{"class":1698},[1670,3317,1721],{"class":1684},[1670,3319,3321,3323,3325,3327,3329,3331,3333,3335,3337],{"class":1672,"line":3320},42,[1670,3322,2401],{"class":1680},[1670,3324,1766],{"class":1684},[1670,3326,1545],{"class":1688},[1670,3328,1692],{"class":1698},[1670,3330,2295],{"class":1680},[1670,3332,1781],{"class":1684},[1670,3334,2347],{"class":1680},[1670,3336,1718],{"class":1698},[1670,3338,1721],{"class":1684},[1670,3340,3342],{"class":1672,"line":3341},43,[1670,3343,2422],{"class":1684},[1670,3345,3347,3349,3351,3353,3355,3357,3359,3361,3363,3365],{"class":1672,"line":3346},44,[1670,3348,2344],{"class":1676},[1670,3350,2438],{"class":1680},[1670,3352,1889],{"class":1684},[1670,3354,2347],{"class":1680},[1670,3356,1766],{"class":1684},[1670,3358,1541],{"class":1688},[1670,3360,1692],{"class":1698},[1670,3362,2451],{"class":1680},[1670,3364,1718],{"class":1698},[1670,3366,1721],{"class":1684},[1670,3368,3370,3372,3374,3376,3378,3380],{"class":1672,"line":3369},45,[1670,3371,2314],{"class":1916},[1670,3373,2317],{"class":1698},[1670,3375,2320],{"class":1684},[1670,3377,2466],{"class":1680},[1670,3379,2325],{"class":1698},[1670,3381,2380],{"class":1684},[1670,3383,3385,3387,3389,3391,3393,3395],{"class":1672,"line":3384},46,[1670,3386,2475],{"class":1680},[1670,3388,1889],{"class":1684},[1670,3390,2091],{"class":1684},[1670,3392,2482],{"class":1688},[1670,3394,1738],{"class":1698},[1670,3396,1721],{"class":1684},[1670,3398,3400,3402,3404,3406,3408,3410,3412,3414,3416],{"class":1672,"line":3399},47,[1670,3401,2385],{"class":1680},[1670,3403,1766],{"class":1684},[1670,3405,1545],{"class":1688},[1670,3407,1692],{"class":1698},[1670,3409,2451],{"class":1680},[1670,3411,1781],{"class":1684},[1670,3413,2438],{"class":1680},[1670,3415,1718],{"class":1698},[1670,3417,1721],{"class":1684},[1670,3419,3421],{"class":1672,"line":3420},48,[1670,3422,2422],{"class":1684},[1670,3424,3426,3428,3430,3432,3434,3436,3438,3440],{"class":1672,"line":3425},49,[1670,3427,2524],{"class":1680},[1670,3429,1766],{"class":1684},[1670,3431,2529],{"class":1688},[1670,3433,1692],{"class":1698},[1670,3435,1812],{"class":1680},[1670,3437,1718],{"class":1698},[1670,3439,1951],{"class":1684},[1670,3441,3442],{"class":1750}," // 把当前 effect 加进去\n",[1670,3444,3446],{"class":1672,"line":3445},50,[1670,3447,2037],{"class":1684},[1670,3449,3451],{"class":1672,"line":3450},51,[1670,3452,1728],{"emptyLinePlaceholder":1727},[1670,3454,3456,3458,3460,3462,3464,3466,3468,3470],{"class":1672,"line":3455},52,[1670,3457,1859],{"class":1676},[1670,3459,2598],{"class":1688},[1670,3461,1692],{"class":1684},[1670,3463,2295],{"class":1867},[1670,3465,1781],{"class":1684},[1670,3467,2300],{"class":1867},[1670,3469,1718],{"class":1684},[1670,3471,1744],{"class":1684},[1670,3473,3475,3477,3479,3481,3483,3485,3487,3489,3491,3493],{"class":1672,"line":3474},53,[1670,3476,1883],{"class":1676},[1670,3478,2347],{"class":1680},[1670,3480,1889],{"class":1684},[1670,3482,2352],{"class":1680},[1670,3484,1766],{"class":1684},[1670,3486,1541],{"class":1688},[1670,3488,1692],{"class":1698},[1670,3490,2295],{"class":1680},[1670,3492,1718],{"class":1698},[1670,3494,1721],{"class":1684},[1670,3496,3498,3500,3502,3504,3506,3508,3510],{"class":1672,"line":3497},54,[1670,3499,2314],{"class":1916},[1670,3501,2317],{"class":1698},[1670,3503,2320],{"class":1684},[1670,3505,2375],{"class":1680},[1670,3507,2325],{"class":1698},[1670,3509,2328],{"class":1916},[1670,3511,1721],{"class":1684},[1670,3513,3515,3517,3519,3521,3523,3525,3527,3529,3531,3533],{"class":1672,"line":3514},55,[1670,3516,1883],{"class":1676},[1670,3518,2438],{"class":1680},[1670,3520,1889],{"class":1684},[1670,3522,2347],{"class":1680},[1670,3524,1766],{"class":1684},[1670,3526,1541],{"class":1688},[1670,3528,1692],{"class":1698},[1670,3530,2451],{"class":1680},[1670,3532,1718],{"class":1698},[1670,3534,1721],{"class":1684},[1670,3536,3538,3540,3542,3544,3546,3548,3550],{"class":1672,"line":3537},56,[1670,3539,2314],{"class":1916},[1670,3541,2317],{"class":1698},[1670,3543,2320],{"class":1684},[1670,3545,2466],{"class":1680},[1670,3547,2325],{"class":1698},[1670,3549,2328],{"class":1916},[1670,3551,1721],{"class":1684},[1670,3553,3555,3557,3559,3561,3563,3565,3567,3569,3571,3573,3575,3577,3579],{"class":1672,"line":3554},57,[1670,3556,2714],{"class":1684},[1670,3558,2482],{"class":1688},[1670,3560,1692],{"class":1698},[1670,3562,2466],{"class":1680},[1670,3564,1718],{"class":1698},[1670,3566,1766],{"class":1684},[1670,3568,2727],{"class":1688},[1670,3570,1692],{"class":1698},[1670,3572,1692],{"class":1684},[1670,3574,1596],{"class":1867},[1670,3576,1718],{"class":1684},[1670,3578,1741],{"class":1676},[1670,3580,1744],{"class":1684},[1670,3582,3584,3586,3588,3590,3592,3594],{"class":1672,"line":3583},58,[1670,3585,2744],{"class":1680},[1670,3587,1766],{"class":1684},[1670,3589,2014],{"class":1688},[1670,3591,1738],{"class":1698},[1670,3593,1951],{"class":1684},[1670,3595,3596],{"class":1750}," // 逐个重新执行\n",[1670,3598,3600,3602,3604],{"class":1672,"line":3599},59,[1670,3601,2757],{"class":1684},[1670,3603,1718],{"class":1698},[1670,3605,1721],{"class":1684},[1670,3607,3609],{"class":1672,"line":3608},60,[1670,3610,2037],{"class":1684},[1670,3612,3614],{"class":1672,"line":3613},61,[1670,3615,1728],{"emptyLinePlaceholder":1727},[1670,3617,3619],{"class":1672,"line":3618},62,[1670,3620,3621],{"class":1750},"// ===== 实际使用 =====\n",[1670,3623,3625,3627,3629,3631,3633,3635,3637,3639,3641,3643,3645,3647,3649,3651],{"class":1672,"line":3624},63,[1670,3626,1677],{"class":1676},[1670,3628,1681],{"class":1680},[1670,3630,1685],{"class":1684},[1670,3632,1689],{"class":1688},[1670,3634,1692],{"class":1680},[1670,3636,1695],{"class":1684},[1670,3638,1699],{"class":1698},[1670,3640,1702],{"class":1684},[1670,3642,1705],{"class":1684},[1670,3644,1709],{"class":1708},[1670,3646,1712],{"class":1684},[1670,3648,1715],{"class":1684},[1670,3650,1718],{"class":1680},[1670,3652,1721],{"class":1684},[1670,3654,3656],{"class":1672,"line":3655},64,[1670,3657,1728],{"emptyLinePlaceholder":1727},[1670,3659,3661,3663,3665,3667,3669],{"class":1672,"line":3660},65,[1670,3662,1596],{"class":1688},[1670,3664,1692],{"class":1680},[1670,3666,1738],{"class":1684},[1670,3668,1741],{"class":1676},[1670,3670,1744],{"class":1684},[1670,3672,3674,3676,3678,3680,3682,3684,3686,3688,3690,3692,3694,3696,3698],{"class":1672,"line":3673},66,[1670,3675,1763],{"class":1680},[1670,3677,1766],{"class":1684},[1670,3679,1769],{"class":1688},[1670,3681,1692],{"class":1698},[1670,3683,1712],{"class":1684},[1670,3685,1776],{"class":1708},[1670,3687,1712],{"class":1684},[1670,3689,1781],{"class":1684},[1670,3691,1784],{"class":1680},[1670,3693,1766],{"class":1684},[1670,3695,1789],{"class":1680},[1670,3697,1718],{"class":1698},[1670,3699,1721],{"class":1684},[1670,3701,3703,3705,3707],{"class":1672,"line":3702},67,[1670,3704,1799],{"class":1684},[1670,3706,1718],{"class":1680},[1670,3708,1721],{"class":1684},[1670,3710,3712],{"class":1672,"line":3711},68,[1670,3713,3714],{"class":1750},"// 打印：name 是: noxussj（effect 立即执行一次）\n",[1670,3716,3718],{"class":1672,"line":3717},69,[1670,3719,1728],{"emptyLinePlaceholder":1727},[1670,3721,3723,3726,3728,3731,3733,3735,3738,3740],{"class":1672,"line":3722},70,[1670,3724,3725],{"class":1680},"obj",[1670,3727,1766],{"class":1684},[1670,3729,3730],{"class":1680},"name ",[1670,3732,1685],{"class":1684},[1670,3734,1705],{"class":1684},[1670,3736,3737],{"class":1708},"小明",[1670,3739,1712],{"class":1684},[1670,3741,1721],{"class":1684},[1670,3743,3745],{"class":1672,"line":3744},71,[1670,3746,3747],{"class":1750},"// 打印：name 是: 小明（trigger 通知 effect 自动重跑）\n",[1531,3749,3750,3751,3753,3754,3757,3758,3760,3761,3780],{},"保存为 ",[1535,3752,2808],{},"，用 Node.js v22 运行 ",[1535,3755,3756],{},"node demo.js","，你会看到 ",[1535,3759,2178],{}," 一修改，effect 里的函数自动又跑了一遍。把这条链路串成一句话：",[1570,3762,3763,3764,3766,3767,3769,3770,3772,3773,3766,3775,3769,3777,3779],{},"effect 执行 → 读取 ",[1535,3765,2178],{}," → ",[1535,3768,1541],{}," 拦截 → ",[1535,3771,1552],{}," 把 effect 记录下来 → 修改 ",[1535,3774,2178],{},[1535,3776,1545],{},[1535,3778,1558],{}," 按记录重跑 effect → 重跑时再次读取，完成新一轮记录","。一轮闭环到此完成，之后每次修改都会自动重复这个过程。",[3782,3783,3784],"warning",{},[1531,3785,3786,3787,3789,3790,3793,3794,3797],{},"真实源码里，组件的渲染函数、computed、watchEffect 底层都是这个 ",[1535,3788,1596],{},"。你在 ",[2239,3791,3792],{"href":671},"Vue3 使用课程"," 里学到的 ",[1535,3795,3796],{},"watchEffect(() => { ... })","，本质就是「把你的函数交给 effect 管理」。",[1635,3799],{},[1526,3801,3803],{"id":3802},"️-嵌套-effect-与清理了解即可","⚠️ 嵌套 effect 与清理（了解即可）",[1531,3805,3806],{},"上面的简化版还有两个真实场景没覆盖。这一节只需知道「有这回事、为什么要处理」，具体实现先不用记。",[1531,3808,3809,3812,3813,3815,3816,3818,3819,3821],{},[1570,3810,3811],{},"嵌套 effect。"," 一个 effect 的函数里可能又调用了 ",[1535,3814,1596],{},"。这时 ",[1535,3817,1812],{}," 会被内层覆盖，内层执行完后，外层的值就丢了，后续的依赖就收不到了。真实源码会把每一层的 ",[1535,3820,1812],{}," 按顺序存起来（栈结构），执行完一层就恢复上一层。",[1531,3823,3824,3827],{},[1570,3825,3826],{},"分支切换时的清理。"," 看这段代码：",[1661,3829,3831],{"className":1663,"code":3830,"language":1665,"meta":1666,"style":1666},"effect(() => {\n    // show 为 true 时读了 name，为 false 时不读\n    console.log(obj.show ? obj.name : 'hidden');\n});\n",[1535,3832,3833,3845,3850,3890],{"__ignoreMap":1666},[1670,3834,3835,3837,3839,3841,3843],{"class":1672,"line":1673},[1670,3836,1596],{"class":1688},[1670,3838,1692],{"class":1680},[1670,3840,1738],{"class":1684},[1670,3842,1741],{"class":1676},[1670,3844,1744],{"class":1684},[1670,3846,3847],{"class":1672,"line":1724},[1670,3848,3849],{"class":1750},"    // show 为 true 时读了 name，为 false 时不读\n",[1670,3851,3852,3854,3856,3858,3860,3862,3864,3867,3870,3872,3874,3876,3879,3881,3884,3886,3888],{"class":1672,"line":1731},[1670,3853,1763],{"class":1680},[1670,3855,1766],{"class":1684},[1670,3857,1769],{"class":1688},[1670,3859,1692],{"class":1698},[1670,3861,3725],{"class":1680},[1670,3863,1766],{"class":1684},[1670,3865,3866],{"class":1680},"show",[1670,3868,3869],{"class":1684}," ?",[1670,3871,1784],{"class":1680},[1670,3873,1766],{"class":1684},[1670,3875,1789],{"class":1680},[1670,3877,3878],{"class":1684}," :",[1670,3880,1705],{"class":1684},[1670,3882,3883],{"class":1708},"hidden",[1670,3885,1712],{"class":1684},[1670,3887,1718],{"class":1698},[1670,3889,1721],{"class":1684},[1670,3891,3892,3894,3896],{"class":1672,"line":1747},[1670,3893,1799],{"class":1684},[1670,3895,1718],{"class":1680},[1670,3897,1721],{"class":1684},[1531,3899,3900,3901,3904,3905,3908,3909,3912,3913,3915,3916,3918],{},"当 ",[1535,3902,3903],{},"obj.show"," 从 ",[1535,3906,3907],{},"true"," 变成 ",[1535,3910,3911],{},"false","，effect 重跑后不再读取 ",[1535,3914,2178],{},"。此时 ",[1535,3917,2178],{}," 再变化，就不该通知这个 effect 了。真实源码在每次重跑前，会先把这个 effect 从所有旧记录里清掉，然后边执行边重新登记，保证记录和当前分支一致。",[1635,3920],{},[1526,3922,3924],{"id":3923},"小节总结","🧾 小节总结",[1564,3926,3927,3939,3954,3971,3980],{},[1567,3928,3929,3932,3933,3935,3936,3938],{},[1535,3930,3931],{},"effect(fn)"," 会立即执行 ",[1535,3934,1868],{},"，执行期间通过全局变量 ",[1535,3937,1812],{}," 暴露自己，让被读取的数据知道「谁在用我」。",[1567,3940,3941,3942,3944,3945,3947,3948,3950,3951,3953],{},"依赖存在 ",[1535,3943,2064],{}," 里，共三层：第一层按对象存（",[1535,3946,2194],{},"，不挡垃圾回收），第二层按属性名存（",[1535,3949,2203],{},"，更新精确到属性），第三层存 effect 集合（",[1535,3952,2221],{},"，自动去重）。",[1567,3955,3956,3958,3959,3961,3962,3964,3965,3967,3968,3970],{},[1535,3957,1552],{}," 在读取时把 ",[1535,3960,1812],{}," 加进对应 ",[1535,3963,2221],{},"；",[1535,3966,1558],{}," 在修改时取出 ",[1535,3969,2221],{}," 逐个重跑 effect，遍历前复制一份避免死循环。",[1567,3972,3973,3974,3976,3977,3979],{},"完整闭环：effect 执行 → 读取触发 ",[1535,3975,1552],{}," 登记 → 修改触发 ",[1535,3978,1558],{}," 重跑 → 重跑时重新登记。",[1567,3981,3982,3983,3985],{},"嵌套 effect 需要保存和恢复 ",[1535,3984,1812],{},"，分支切换需要先清理旧依赖，真实源码均已处理，了解即可。",[1635,3987],{},[1526,3989,3991],{"id":3990},"知识问答","❓ 知识问答",[1531,3993,3994],{},[1570,3995,3996],{},"Q1：为什么第一层用 WeakMap 而不是普通 Map？",[1531,3998,3999],{},"A：因为 key 是响应式对象本身。WeakMap 对 key 是弱引用，对象没人用了就会被垃圾回收自动清掉，依赖记录也跟着消失。普通 Map 会一直拽着这个对象不放，导致它永远无法释放，白白占用内存，也就是常说的内存泄漏。",[1531,4001,4002],{},[1570,4003,4004],{},"Q2：为什么第三层用 Set 而不是数组？",[1531,4006,4007],{},"A：为了去重。一个 effect 可能在函数里多次读取同一个属性，用数组会登记好几次，数据一变就重复执行好几次。Set 自动去重，保证一个 effect 只执行一次。",[1531,4009,4010],{},[1570,4011,4012],{},"Q3：Vue3 的 effect 和 Vue2 的 Watcher 是什么关系？",[1531,4014,4015],{},"A：可以理解成同一角色的两个版本：effect 大致对应 Watcher，targetMap 里的 Set 大致对应 Dep。Vue2 是每个属性存一份记录，Vue3 改成一张全局表统一查。职责没变，都是「数据变化时通知使用者重新执行」。",[1531,4017,4018],{},[1570,4019,4020],{},"Q4：普通函数里读取响应式数据，会被收集依赖吗？",[1531,4022,4023,4024,4026,4027,4029],{},"A：不会。",[1535,4025,1552],{}," 做的第一件事就是判断 ",[1535,4028,1812],{}," 是否存在，只有 effect 正在执行期间的读取才会被记录。普通读取只是普通取值。",[1531,4031,4032],{},[1570,4033,4034],{},"Q5：为什么 effect 每次重跑都要重新收集依赖？",[1531,4036,4037,4038,4041],{},"A：因为依赖关系可能是动态的。比如 ",[1535,4039,4040],{},"obj.show ? obj.name : 'hidden'","，条件不同，读到的属性就不同。每次重跑都清掉旧记录重新登记，通知才能永远对准当前真正用到的数据。",[1635,4043],{},[1526,4045,4047],{"id":4046},"小练习","🧪 小练习",[1531,4049,4050,4051,4053,4054,4057],{},"不查资料，补全下面三个函数，实现「修改 ",[1535,4052,2178],{}," 后 effect 自动重跑」。用 Node.js v22 保存为 ",[1535,4055,4056],{},".js"," 文件直接运行验证：",[1661,4059,4061],{"className":1663,"code":4060,"language":1665,"meta":1666,"style":1666},"const targetMap = new WeakMap();\nlet activeEffect = null;\n\nfunction effect(fn) {\n    // 请在这里编写代码（提示：立即执行 fn，执行期间把 activeEffect 指向自己）\n}\n\nfunction track(target, key) {\n    // 请在这里编写代码（提示：按对象、属性名、Set 三层逐级查找或新建，最后把 activeEffect 加进 Set）\n}\n\nfunction trigger(target, key) {\n    // 请在这里编写代码（提示：查出对应属性的 Set，复制一份后逐个执行 effect.run）\n}\n\nfunction reactive(target) {\n    return new Proxy(target, {\n        get(target, key, receiver) {\n            const result = Reflect.get(target, key, receiver);\n            track(target, key);\n            return result;\n        },\n        set(target, key, value, receiver) {\n            const result = Reflect.set(target, key, value, receiver);\n            trigger(target, key);\n            return result;\n        },\n    });\n}\n\nconst obj = reactive({ name: 'noxussj', age: 18 });\n\neffect(() => {\n    console.log('name 是:', obj.name);\n});\n\n// 期望输出：\n// name 是: noxussj\n// name 是: 小明\nobj.name = '小明';\n\n// 期望：修改 age 不会触发重跑（依赖精确到属性）\nobj.age = 20;\n",[1535,4062,4063,4079,4089,4093,4107,4112,4116,4120,4138,4143,4147,4151,4169,4174,4178,4182,4196,4212,4232,4262,4278,4286,4290,4314,4348,4364,4372,4376,4384,4388,4392,4433,4437,4449,4477,4485,4489,4494,4499,4504,4522,4526,4531],{"__ignoreMap":1666},[1670,4064,4065,4067,4069,4071,4073,4075,4077],{"class":1672,"line":1673},[1670,4066,1677],{"class":1676},[1670,4068,2086],{"class":1680},[1670,4070,1685],{"class":1684},[1670,4072,2091],{"class":1684},[1670,4074,2094],{"class":1688},[1670,4076,1738],{"class":1680},[1670,4078,1721],{"class":1684},[1670,4080,4081,4083,4085,4087],{"class":1672,"line":1724},[1670,4082,1842],{"class":1676},[1670,4084,1845],{"class":1680},[1670,4086,1685],{"class":1684},[1670,4088,1850],{"class":1684},[1670,4090,4091],{"class":1672,"line":1731},[1670,4092,1728],{"emptyLinePlaceholder":1727},[1670,4094,4095,4097,4099,4101,4103,4105],{"class":1672,"line":1747},[1670,4096,1859],{"class":1676},[1670,4098,1862],{"class":1688},[1670,4100,1692],{"class":1684},[1670,4102,1868],{"class":1867},[1670,4104,1718],{"class":1684},[1670,4106,1744],{"class":1684},[1670,4108,4109],{"class":1672,"line":1754},[1670,4110,4111],{"class":1750},"    // 请在这里编写代码（提示：立即执行 fn，执行期间把 activeEffect 指向自己）\n",[1670,4113,4114],{"class":1672,"line":1760},[1670,4115,2037],{"class":1684},[1670,4117,4118],{"class":1672,"line":1796},[1670,4119,1728],{"emptyLinePlaceholder":1727},[1670,4121,4122,4124,4126,4128,4130,4132,4134,4136],{"class":1672,"line":1880},[1670,4123,1859],{"class":1676},[1670,4125,2290],{"class":1688},[1670,4127,1692],{"class":1684},[1670,4129,2295],{"class":1867},[1670,4131,1781],{"class":1684},[1670,4133,2300],{"class":1867},[1670,4135,1718],{"class":1684},[1670,4137,1744],{"class":1684},[1670,4139,4140],{"class":1672,"line":1894},[1670,4141,4142],{"class":1750},"    // 请在这里编写代码（提示：按对象、属性名、Set 三层逐级查找或新建，最后把 activeEffect 加进 Set）\n",[1670,4144,4145],{"class":1672,"line":1903},[1670,4146,2037],{"class":1684},[1670,4148,4149],{"class":1672,"line":1913},[1670,4150,1728],{"emptyLinePlaceholder":1727},[1670,4152,4153,4155,4157,4159,4161,4163,4165,4167],{"class":1672,"line":1922},[1670,4154,1859],{"class":1676},[1670,4156,2598],{"class":1688},[1670,4158,1692],{"class":1684},[1670,4160,2295],{"class":1867},[1670,4162,1781],{"class":1684},[1670,4164,2300],{"class":1867},[1670,4166,1718],{"class":1684},[1670,4168,1744],{"class":1684},[1670,4170,4171],{"class":1672,"line":1928},[1670,4172,4173],{"class":1750},"    // 请在这里编写代码（提示：查出对应属性的 Set，复制一份后逐个执行 effect.run）\n",[1670,4175,4176],{"class":1672,"line":1940},[1670,4177,2037],{"class":1684},[1670,4179,4180],{"class":1672,"line":1957},[1670,4181,1728],{"emptyLinePlaceholder":1727},[1670,4183,4184,4186,4188,4190,4192,4194],{"class":1672,"line":1968},[1670,4185,1859],{"class":1676},[1670,4187,1689],{"class":1688},[1670,4189,1692],{"class":1684},[1670,4191,2295],{"class":1867},[1670,4193,1718],{"class":1684},[1670,4195,1744],{"class":1684},[1670,4197,4198,4200,4202,4204,4206,4208,4210],{"class":1672,"line":1974},[1670,4199,2027],{"class":1916},[1670,4201,2091],{"class":1684},[1670,4203,2838],{"class":1688},[1670,4205,1692],{"class":1698},[1670,4207,2295],{"class":1680},[1670,4209,1781],{"class":1684},[1670,4211,1744],{"class":1684},[1670,4213,4214,4216,4218,4220,4222,4224,4226,4228,4230],{"class":1672,"line":1983},[1670,4215,2851],{"class":1698},[1670,4217,1692],{"class":1684},[1670,4219,2295],{"class":1867},[1670,4221,1781],{"class":1684},[1670,4223,2300],{"class":1867},[1670,4225,1781],{"class":1684},[1670,4227,2864],{"class":1867},[1670,4229,1718],{"class":1684},[1670,4231,1744],{"class":1684},[1670,4233,4234,4236,4238,4240,4242,4244,4246,4248,4250,4252,4254,4256,4258,4260],{"class":1672,"line":1989},[1670,4235,2873],{"class":1676},[1670,4237,2876],{"class":1680},[1670,4239,1889],{"class":1684},[1670,4241,2881],{"class":1680},[1670,4243,1766],{"class":1684},[1670,4245,1541],{"class":1688},[1670,4247,1692],{"class":1698},[1670,4249,2295],{"class":1680},[1670,4251,1781],{"class":1684},[1670,4253,2300],{"class":1680},[1670,4255,1781],{"class":1684},[1670,4257,2864],{"class":1680},[1670,4259,1718],{"class":1698},[1670,4261,1721],{"class":1684},[1670,4263,4264,4266,4268,4270,4272,4274,4276],{"class":1672,"line":1995},[1670,4265,2906],{"class":1688},[1670,4267,1692],{"class":1698},[1670,4269,2295],{"class":1680},[1670,4271,1781],{"class":1684},[1670,4273,2300],{"class":1680},[1670,4275,1718],{"class":1698},[1670,4277,1721],{"class":1684},[1670,4279,4280,4282,4284],{"class":1672,"line":2001},[1670,4281,2926],{"class":1916},[1670,4283,2876],{"class":1680},[1670,4285,1721],{"class":1684},[1670,4287,4288],{"class":1672,"line":2006},[1670,4289,1992],{"class":1684},[1670,4291,4292,4294,4296,4298,4300,4302,4304,4306,4308,4310,4312],{"class":1672,"line":2024},[1670,4293,2939],{"class":1698},[1670,4295,1692],{"class":1684},[1670,4297,2295],{"class":1867},[1670,4299,1781],{"class":1684},[1670,4301,2300],{"class":1867},[1670,4303,1781],{"class":1684},[1670,4305,2952],{"class":1867},[1670,4307,1781],{"class":1684},[1670,4309,2864],{"class":1867},[1670,4311,1718],{"class":1684},[1670,4313,1744],{"class":1684},[1670,4315,4316,4318,4320,4322,4324,4326,4328,4330,4332,4334,4336,4338,4340,4342,4344,4346],{"class":1672,"line":2034},[1670,4317,2873],{"class":1676},[1670,4319,2876],{"class":1680},[1670,4321,1889],{"class":1684},[1670,4323,2881],{"class":1680},[1670,4325,1766],{"class":1684},[1670,4327,1545],{"class":1688},[1670,4329,1692],{"class":1698},[1670,4331,2295],{"class":1680},[1670,4333,1781],{"class":1684},[1670,4335,2300],{"class":1680},[1670,4337,1781],{"class":1684},[1670,4339,2952],{"class":1680},[1670,4341,1781],{"class":1684},[1670,4343,2864],{"class":1680},[1670,4345,1718],{"class":1698},[1670,4347,1721],{"class":1684},[1670,4349,4350,4352,4354,4356,4358,4360,4362],{"class":1672,"line":3125},[1670,4351,2999],{"class":1688},[1670,4353,1692],{"class":1698},[1670,4355,2295],{"class":1680},[1670,4357,1781],{"class":1684},[1670,4359,2300],{"class":1680},[1670,4361,1718],{"class":1698},[1670,4363,1721],{"class":1684},[1670,4365,4366,4368,4370],{"class":1672,"line":3132},[1670,4367,2926],{"class":1916},[1670,4369,2876],{"class":1680},[1670,4371,1721],{"class":1684},[1670,4373,4374],{"class":1672,"line":3146},[1670,4375,1992],{"class":1684},[1670,4377,4378,4380,4382],{"class":1672,"line":3157},[1670,4379,2757],{"class":1684},[1670,4381,1718],{"class":1698},[1670,4383,1721],{"class":1684},[1670,4385,4386],{"class":1672,"line":3166},[1670,4387,2037],{"class":1684},[1670,4389,4390],{"class":1672,"line":3178},[1670,4391,1728],{"emptyLinePlaceholder":1727},[1670,4393,4394,4396,4398,4400,4402,4404,4406,4408,4410,4412,4414,4416,4418,4421,4423,4427,4429,4431],{"class":1672,"line":3183},[1670,4395,1677],{"class":1676},[1670,4397,1681],{"class":1680},[1670,4399,1685],{"class":1684},[1670,4401,1689],{"class":1688},[1670,4403,1692],{"class":1680},[1670,4405,1695],{"class":1684},[1670,4407,1699],{"class":1698},[1670,4409,1702],{"class":1684},[1670,4411,1705],{"class":1684},[1670,4413,1709],{"class":1708},[1670,4415,1712],{"class":1684},[1670,4417,1781],{"class":1684},[1670,4419,4420],{"class":1698}," age",[1670,4422,1702],{"class":1684},[1670,4424,4426],{"class":4425},"smPcV"," 18",[1670,4428,1715],{"class":1684},[1670,4430,1718],{"class":1680},[1670,4432,1721],{"class":1684},[1670,4434,4435],{"class":1672,"line":3188},[1670,4436,1728],{"emptyLinePlaceholder":1727},[1670,4438,4439,4441,4443,4445,4447],{"class":1672,"line":3193},[1670,4440,1596],{"class":1688},[1670,4442,1692],{"class":1680},[1670,4444,1738],{"class":1684},[1670,4446,1741],{"class":1676},[1670,4448,1744],{"class":1684},[1670,4450,4451,4453,4455,4457,4459,4461,4463,4465,4467,4469,4471,4473,4475],{"class":1672,"line":3209},[1670,4452,1763],{"class":1680},[1670,4454,1766],{"class":1684},[1670,4456,1769],{"class":1688},[1670,4458,1692],{"class":1698},[1670,4460,1712],{"class":1684},[1670,4462,1776],{"class":1708},[1670,4464,1712],{"class":1684},[1670,4466,1781],{"class":1684},[1670,4468,1784],{"class":1680},[1670,4470,1766],{"class":1684},[1670,4472,1789],{"class":1680},[1670,4474,1718],{"class":1698},[1670,4476,1721],{"class":1684},[1670,4478,4479,4481,4483],{"class":1672,"line":3218},[1670,4480,1799],{"class":1684},[1670,4482,1718],{"class":1680},[1670,4484,1721],{"class":1684},[1670,4486,4487],{"class":1672,"line":3223},[1670,4488,1728],{"emptyLinePlaceholder":1727},[1670,4490,4491],{"class":1672,"line":3228},[1670,4492,4493],{"class":1750},"// 期望输出：\n",[1670,4495,4496],{"class":1672,"line":3247},[1670,4497,4498],{"class":1750},"// name 是: noxussj\n",[1670,4500,4501],{"class":1672,"line":3267},[1670,4502,4503],{"class":1750},"// name 是: 小明\n",[1670,4505,4506,4508,4510,4512,4514,4516,4518,4520],{"class":1672,"line":3290},[1670,4507,3725],{"class":1680},[1670,4509,1766],{"class":1684},[1670,4511,3730],{"class":1680},[1670,4513,1685],{"class":1684},[1670,4515,1705],{"class":1684},[1670,4517,3737],{"class":1708},[1670,4519,1712],{"class":1684},[1670,4521,1721],{"class":1684},[1670,4523,4524],{"class":1672,"line":3305},[1670,4525,1728],{"emptyLinePlaceholder":1727},[1670,4527,4528],{"class":1672,"line":3320},[1670,4529,4530],{"class":1750},"// 期望：修改 age 不会触发重跑（依赖精确到属性）\n",[1670,4532,4533,4535,4537,4540,4542,4545],{"class":1672,"line":3341},[1670,4534,3725],{"class":1680},[1670,4536,1766],{"class":1684},[1670,4538,4539],{"class":1680},"age ",[1670,4541,1685],{"class":1684},[1670,4543,4544],{"class":4425}," 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