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get",[1655,1744,1745],{"class":1669},"()",[1655,1747,1735],{"class":1669},[1655,1749,1751,1754,1756,1759,1762,1764,1767,1769,1772],{"class":1657,"line":1750},6,[1655,1752,1753],{"class":1665},"        console",[1655,1755,1713],{"class":1669},[1655,1757,1758],{"class":1716},"log",[1655,1760,1761],{"class":1741},"(",[1655,1763,1694],{"class":1669},[1655,1765,1766],{"class":1690},"读取了 name",[1655,1768,1694],{"class":1669},[1655,1770,1771],{"class":1741},")",[1655,1773,1697],{"class":1669},[1655,1775,1777,1781,1784],{"class":1657,"line":1776},7,[1655,1778,1780],{"class":1779},"s8pZq","        return",[1655,1782,1783],{"class":1665}," name",[1655,1785,1697],{"class":1669},[1655,1787,1789],{"class":1657,"line":1788},8,[1655,1790,1791],{"class":1669},"    },\n",[1655,1793,1795,1798,1800,1804,1806],{"class":1657,"line":1794},9,[1655,1796,1797],{"class":1741},"    set",[1655,1799,1761],{"class":1669},[1655,1801,1803],{"class":1802},"sK9QF","newVal",[1655,1805,1771],{"class":1669},[1655,1807,1735],{"class":1669},[1655,1809,1811,1813,1815,1817,1819,1821,1824,1826,1828,1831,1833],{"class":1657,"line":1810},10,[1655,1812,1753],{"class":1665},[1655,1814,1713],{"class":1669},[1655,1816,1758],{"class":1716},[1655,1818,1761],{"class":1741},[1655,1820,1694],{"class":1669},[1655,1822,1823],{"class":1690},"修改了 name:",[1655,1825,1694],{"class":1669},[1655,1827,1723],{"class":1669},[1655,1829,1830],{"class":1665}," newVal",[1655,1832,1771],{"class":1741},[1655,1834,1697],{"class":1669},[1655,1836,1838,1841,1844,1846],{"class":1657,"line":1837},11,[1655,1839,1840],{"class":1665},"        name",[1655,1842,1843],{"class":1669}," =",[1655,1845,1830],{"class":1665},[1655,1847,1697],{"class":1669},[1655,1849,1851],{"class":1657,"line":1850},12,[1655,1852,1791],{"class":1669},[1655,1854,1856,1859,1861],{"class":1657,"line":1855},13,[1655,1857,1858],{"class":1669},"}",[1655,1860,1771],{"class":1665},[1655,1862,1697],{"class":1669},[1655,1864,1866],{"class":1657,"line":1865},14,[1655,1867,1704],{"emptyLinePlaceholder":1703},[1655,1869,1871,1874,1876,1878,1881],{"class":1657,"line":1870},15,[1655,1872,1873],{"class":1665},"user",[1655,1875,1713],{"class":1669},[1655,1877,1728],{"class":1665},[1655,1879,1880],{"class":1669},";",[1655,1882,1884],{"class":1883},"syuKq"," // 打印：读取了 name\n",[1655,1886,1888,1890,1892,1895,1897,1899,1902,1904,1906],{"class":1657,"line":1887},16,[1655,1889,1873],{"class":1665},[1655,1891,1713],{"class":1669},[1655,1893,1894],{"class":1665},"name ",[1655,1896,1670],{"class":1669},[1655,1898,1687],{"class":1669},[1655,1900,1901],{"class":1690},"小明",[1655,1903,1694],{"class":1669},[1655,1905,1880],{"class":1669},[1655,1907,1908],{"class":1883}," // 打印：修改了 name: 小明\n",[1531,1910,1911,1912,1915],{},"用 Node.js v22 运行 ",[1542,1913,1914],{},"node demo.js","，就能看到读取和修改都被我们拦截下来了。",[1917,1918,1919],"tip",{},[1531,1920,1921,1922,1924,1925,1928],{},"真正的数据保存在局部变量 ",[1542,1923,1728],{}," 里，",[1542,1926,1927],{},"user.name"," 只是一个「入口」。getter/setter 通过闭包记住了这个变量，所以读写都能拿到正确的值。",[1531,1930,1931,1932,1611],{},"能拦截读写，就有了实现响应式的基础：",[1571,1933,1934],{},"在 getter 里登记使用者（依赖收集），在 setter 里通知更新",[1588,1936],{},[1526,1938,1940],{"id":1939},"definereactive把一个属性变成响应式","🧱 defineReactive：把一个属性变成响应式",[1531,1942,1943,1944,1946],{},"Vue2 把「给单个属性加 getter/setter」封装成了 ",[1542,1945,1551],{}," 函数。下面是教学简化版，去掉了 Flow 类型注解和边界分支，保留核心逻辑：",[1645,1948,1950],{"className":1647,"code":1949,"language":1650,"meta":1651,"style":1651},"// 简化自 src/core/observer/index.js 的 defineReactive\nfunction defineReactive(obj, key, val) {\n    // 嵌套对象也要递归变成响应式\n    observe(val);\n\n    Object.defineProperty(obj, key, {\n        get() {\n            // 依赖收集：登记「谁在用这个属性」\n            // 细节下一篇讲，这里先占位：dep.depend()\n            return val;\n        },\n        set(newVal) {\n            if (newVal === val) return;\n            val = newVal;\n            // 新赋的值如果是对象，也要变成响应式\n            observe(newVal);\n            // 触发更新：通知视图重新渲染，下一篇细讲\n            // dep.notify()\n            console.log(`触发更新：${key} 变成了`, newVal);\n        },\n    });\n}\n",[1542,1951,1952,1957,1984,1989,2003,2007,2028,2037,2042,2047,2056,2061,2074,2097,2108,2113,2126,2132,2138,2177,2182,2192],{"__ignoreMap":1651},[1655,1953,1954],{"class":1657,"line":1658},[1655,1955,1956],{"class":1883},"// 简化自 src/core/observer/index.js 的 defineReactive\n",[1655,1958,1959,1962,1965,1967,1970,1972,1975,1977,1980,1982],{"class":1657,"line":1676},[1655,1960,1961],{"class":1661},"function",[1655,1963,1964],{"class":1716}," defineReactive",[1655,1966,1761],{"class":1669},[1655,1968,1969],{"class":1802},"obj",[1655,1971,1723],{"class":1669},[1655,1973,1974],{"class":1802}," key",[1655,1976,1723],{"class":1669},[1655,1978,1979],{"class":1802}," val",[1655,1981,1771],{"class":1669},[1655,1983,1735],{"class":1669},[1655,1985,1986],{"class":1657,"line":1700},[1655,1987,1988],{"class":1883},"    // 嵌套对象也要递归变成响应式\n",[1655,1990,1991,1994,1996,1999,2001],{"class":1657,"line":1707},[1655,1992,1993],{"class":1716},"    observe",[1655,1995,1761],{"class":1741},[1655,1997,1998],{"class":1665},"val",[1655,2000,1771],{"class":1741},[1655,2002,1697],{"class":1669},[1655,2004,2005],{"class":1657,"line":1738},[1655,2006,1704],{"emptyLinePlaceholder":1703},[1655,2008,2009,2012,2014,2016,2018,2020,2022,2024,2026],{"class":1657,"line":1750},[1655,2010,2011],{"class":1665},"    Object",[1655,2013,1713],{"class":1669},[1655,2015,1717],{"class":1716},[1655,2017,1761],{"class":1741},[1655,2019,1969],{"class":1665},[1655,2021,1723],{"class":1669},[1655,2023,1974],{"class":1665},[1655,2025,1723],{"class":1669},[1655,2027,1735],{"class":1669},[1655,2029,2030,2033,2035],{"class":1657,"line":1776},[1655,2031,2032],{"class":1741},"        get",[1655,2034,1745],{"class":1669},[1655,2036,1735],{"class":1669},[1655,2038,2039],{"class":1657,"line":1788},[1655,2040,2041],{"class":1883},"            // 依赖收集：登记「谁在用这个属性」\n",[1655,2043,2044],{"class":1657,"line":1794},[1655,2045,2046],{"class":1883},"            // 细节下一篇讲，这里先占位：dep.depend()\n",[1655,2048,2049,2052,2054],{"class":1657,"line":1810},[1655,2050,2051],{"class":1779},"            return",[1655,2053,1979],{"class":1665},[1655,2055,1697],{"class":1669},[1655,2057,2058],{"class":1657,"line":1837},[1655,2059,2060],{"class":1669},"        },\n",[1655,2062,2063,2066,2068,2070,2072],{"class":1657,"line":1850},[1655,2064,2065],{"class":1741},"        set",[1655,2067,1761],{"class":1669},[1655,2069,1803],{"class":1802},[1655,2071,1771],{"class":1669},[1655,2073,1735],{"class":1669},[1655,2075,2076,2079,2082,2084,2087,2089,2092,2095],{"class":1657,"line":1855},[1655,2077,2078],{"class":1779},"            if",[1655,2080,2081],{"class":1741}," (",[1655,2083,1803],{"class":1665},[1655,2085,2086],{"class":1669}," ===",[1655,2088,1979],{"class":1665},[1655,2090,2091],{"class":1741},") ",[1655,2093,2094],{"class":1779},"return",[1655,2096,1697],{"class":1669},[1655,2098,2099,2102,2104,2106],{"class":1657,"line":1865},[1655,2100,2101],{"class":1665},"            val",[1655,2103,1843],{"class":1669},[1655,2105,1830],{"class":1665},[1655,2107,1697],{"class":1669},[1655,2109,2110],{"class":1657,"line":1870},[1655,2111,2112],{"class":1883},"            // 新赋的值如果是对象，也要变成响应式\n",[1655,2114,2115,2118,2120,2122,2124],{"class":1657,"line":1887},[1655,2116,2117],{"class":1716},"            observe",[1655,2119,1761],{"class":1741},[1655,2121,1803],{"class":1665},[1655,2123,1771],{"class":1741},[1655,2125,1697],{"class":1669},[1655,2127,2129],{"class":1657,"line":2128},17,[1655,2130,2131],{"class":1883},"            // 触发更新：通知视图重新渲染，下一篇细讲\n",[1655,2133,2135],{"class":1657,"line":2134},18,[1655,2136,2137],{"class":1883},"            // dep.notify()\n",[1655,2139,2141,2144,2146,2148,2150,2153,2156,2159,2162,2164,2167,2169,2171,2173,2175],{"class":1657,"line":2140},19,[1655,2142,2143],{"class":1665},"            console",[1655,2145,1713],{"class":1669},[1655,2147,1758],{"class":1716},[1655,2149,1761],{"class":1741},[1655,2151,2152],{"class":1669},"`",[1655,2154,2155],{"class":1690},"触发更新：",[1655,2157,2158],{"class":1669},"${",[1655,2160,2161],{"class":1665},"key",[1655,2163,1858],{"class":1669},[1655,2165,2166],{"class":1690}," 变成了",[1655,2168,2152],{"class":1669},[1655,2170,1723],{"class":1669},[1655,2172,1830],{"class":1665},[1655,2174,1771],{"class":1741},[1655,2176,1697],{"class":1669},[1655,2178,2180],{"class":1657,"line":2179},20,[1655,2181,2060],{"class":1669},[1655,2183,2185,2188,2190],{"class":1657,"line":2184},21,[1655,2186,2187],{"class":1669},"    }",[1655,2189,1771],{"class":1741},[1655,2191,1697],{"class":1669},[1655,2193,2195],{"class":1657,"line":2194},22,[1655,2196,2197],{"class":1669},"}\n",[1531,2199,2200],{},"注意三个要点：",[1535,2202,2203,2217,2223],{},[1538,2204,2205,2208,2209,2212,2213,2216],{},[1571,2206,2207],{},"递归观测","：调 ",[1542,2210,2211],{},"observe(val)","，保证 ",[1542,2214,2215],{},"user.info.name"," 这种深层属性也是响应式的。",[1538,2218,2219,2222],{},[1571,2220,2221],{},"get 里收集依赖","：谁在渲染时读了这个属性，就把它记下来。具体怎么记，下一篇「依赖收集与 Watcher」会展开。",[1538,2224,2225,2228,2229,2232],{},[1571,2226,2227],{},"set 里触发更新","：值变了就通知视图。同时对新值再调一次 ",[1542,2230,2231],{},"observe","，防止新赋的对象「漏网」。",[1588,2234],{},[1526,2236,2238],{"id":2237},"observer-类遍历整个对象","🧱 Observer 类：遍历整个对象",[1531,2240,2241,2243,2244,2246,2247,2249,2250,2252],{},[1542,2242,1551],{}," 一次只能处理一个 key，而 ",[1542,2245,1607],{}," 往往是一整个对象。",[1542,2248,1555],{}," 类负责遍历对象的每个 key，逐个调用 ",[1542,2251,1551],{},"：",[1645,2254,2256],{"className":1647,"code":2255,"language":1650,"meta":1651,"style":1651},"// 简化自 src/core/observer/index.js 的 Observer 类\nclass Observer {\n    constructor(data) {\n        // 给数据打上 __ob__ 标记，表示「已观测」，避免重复处理\n        Object.defineProperty(data, '__ob__', {\n            value: this,\n            enumerable: false, // 不可枚举，遍历时不会出现\n        });\n\n        if (Array.isArray(data)) {\n            // 数组走特殊处理，下一节讲\n            protoAugment(data, arrayMethods);\n            this.observeArray(data);\n        } else {\n            // 对象：遍历每个 key，逐个响应式化\n            this.walk(data);\n        }\n    }\n\n    walk(data) {\n        Object.keys(data).forEach((key) => {\n            defineReactive(data, key, data[key]);\n        });\n    }\n\n    observeArray(items) {\n        items.forEach((item) => observe(item));\n    }\n}\n\nfunction observe(data) {\n    if (typeof data !== 'object' || data === null) return;\n    // 已经观测过（有 __ob__）就直接复用，不再重复处理\n    if (data.__ob__) return data.__ob__;\n    return new Observer(data);\n}\n",[1542,2257,2258,2263,2274,2287,2292,2318,2329,2345,2354,2358,2383,2388,2406,2422,2431,2436,2451,2456,2461,2465,2478,2511,2539,2548,2553,2558,2573,2606,2611,2616,2621,2636,2675,2681,2706,2725],{"__ignoreMap":1651},[1655,2259,2260],{"class":1657,"line":1658},[1655,2261,2262],{"class":1883},"// 简化自 src/core/observer/index.js 的 Observer 类\n",[1655,2264,2265,2268,2272],{"class":1657,"line":1676},[1655,2266,2267],{"class":1661},"class",[1655,2269,2271],{"class":2270},"sYGMc"," Observer",[1655,2273,1735],{"class":1669},[1655,2275,2276,2279,2281,2283,2285],{"class":1657,"line":1700},[1655,2277,2278],{"class":1661},"    constructor",[1655,2280,1761],{"class":1669},[1655,2282,1607],{"class":1802},[1655,2284,1771],{"class":1669},[1655,2286,1735],{"class":1669},[1655,2288,2289],{"class":1657,"line":1707},[1655,2290,2291],{"class":1883},"        // 给数据打上 __ob__ 标记，表示「已观测」，避免重复处理\n",[1655,2293,2294,2297,2299,2301,2303,2305,2307,2309,2312,2314,2316],{"class":1657,"line":1738},[1655,2295,2296],{"class":1665},"        Object",[1655,2298,1713],{"class":1669},[1655,2300,1717],{"class":1716},[1655,2302,1761],{"class":1741},[1655,2304,1607],{"class":1665},[1655,2306,1723],{"class":1669},[1655,2308,1687],{"class":1669},[1655,2310,2311],{"class":1690},"__ob__",[1655,2313,1694],{"class":1669},[1655,2315,1723],{"class":1669},[1655,2317,1735],{"class":1669},[1655,2319,2320,2323,2326],{"class":1657,"line":1750},[1655,2321,2322],{"class":1741},"            value",[1655,2324,2325],{"class":1669},":",[1655,2327,2328],{"class":1669}," this,\n",[1655,2330,2331,2334,2336,2340,2342],{"class":1657,"line":1776},[1655,2332,2333],{"class":1741},"            enumerable",[1655,2335,2325],{"class":1669},[1655,2337,2339],{"class":2338},"sPKOg"," false",[1655,2341,1723],{"class":1669},[1655,2343,2344],{"class":1883}," // 不可枚举，遍历时不会出现\n",[1655,2346,2347,2350,2352],{"class":1657,"line":1788},[1655,2348,2349],{"class":1669},"        }",[1655,2351,1771],{"class":1741},[1655,2353,1697],{"class":1669},[1655,2355,2356],{"class":1657,"line":1794},[1655,2357,1704],{"emptyLinePlaceholder":1703},[1655,2359,2360,2363,2365,2368,2370,2373,2375,2377,2380],{"class":1657,"line":1810},[1655,2361,2362],{"class":1779},"        if",[1655,2364,2081],{"class":1741},[1655,2366,2367],{"class":1665},"Array",[1655,2369,1713],{"class":1669},[1655,2371,2372],{"class":1716},"isArray",[1655,2374,1761],{"class":1741},[1655,2376,1607],{"class":1665},[1655,2378,2379],{"class":1741},")) ",[1655,2381,2382],{"class":1669},"{\n",[1655,2384,2385],{"class":1657,"line":1837},[1655,2386,2387],{"class":1883},"            // 数组走特殊处理，下一节讲\n",[1655,2389,2390,2393,2395,2397,2399,2402,2404],{"class":1657,"line":1850},[1655,2391,2392],{"class":1716},"            protoAugment",[1655,2394,1761],{"class":1741},[1655,2396,1607],{"class":1665},[1655,2398,1723],{"class":1669},[1655,2400,2401],{"class":1665}," arrayMethods",[1655,2403,1771],{"class":1741},[1655,2405,1697],{"class":1669},[1655,2407,2408,2411,2414,2416,2418,2420],{"class":1657,"line":1855},[1655,2409,2410],{"class":1669},"            this.",[1655,2412,2413],{"class":1716},"observeArray",[1655,2415,1761],{"class":1741},[1655,2417,1607],{"class":1665},[1655,2419,1771],{"class":1741},[1655,2421,1697],{"class":1669},[1655,2423,2424,2426,2429],{"class":1657,"line":1865},[1655,2425,2349],{"class":1669},[1655,2427,2428],{"class":1779}," else",[1655,2430,1735],{"class":1669},[1655,2432,2433],{"class":1657,"line":1870},[1655,2434,2435],{"class":1883},"            // 对象：遍历每个 key，逐个响应式化\n",[1655,2437,2438,2440,2443,2445,2447,2449],{"class":1657,"line":1887},[1655,2439,2410],{"class":1669},[1655,2441,2442],{"class":1716},"walk",[1655,2444,1761],{"class":1741},[1655,2446,1607],{"class":1665},[1655,2448,1771],{"class":1741},[1655,2450,1697],{"class":1669},[1655,2452,2453],{"class":1657,"line":2128},[1655,2454,2455],{"class":1669},"        }\n",[1655,2457,2458],{"class":1657,"line":2134},[1655,2459,2460],{"class":1669},"    }\n",[1655,2462,2463],{"class":1657,"line":2140},[1655,2464,1704],{"emptyLinePlaceholder":1703},[1655,2466,2467,2470,2472,2474,2476],{"class":1657,"line":2179},[1655,2468,2469],{"class":1741},"    walk",[1655,2471,1761],{"class":1669},[1655,2473,1607],{"class":1802},[1655,2475,1771],{"class":1669},[1655,2477,1735],{"class":1669},[1655,2479,2480,2482,2484,2487,2489,2491,2493,2495,2498,2500,2502,2504,2506,2509],{"class":1657,"line":2184},[1655,2481,2296],{"class":1665},[1655,2483,1713],{"class":1669},[1655,2485,2486],{"class":1716},"keys",[1655,2488,1761],{"class":1741},[1655,2490,1607],{"class":1665},[1655,2492,1771],{"class":1741},[1655,2494,1713],{"class":1669},[1655,2496,2497],{"class":1716},"forEach",[1655,2499,1761],{"class":1741},[1655,2501,1761],{"class":1669},[1655,2503,2161],{"class":1802},[1655,2505,1771],{"class":1669},[1655,2507,2508],{"class":1661}," =>",[1655,2510,1735],{"class":1669},[1655,2512,2513,2516,2518,2520,2522,2524,2526,2529,2532,2534,2537],{"class":1657,"line":2194},[1655,2514,2515],{"class":1716},"            defineReactive",[1655,2517,1761],{"class":1741},[1655,2519,1607],{"class":1665},[1655,2521,1723],{"class":1669},[1655,2523,1974],{"class":1665},[1655,2525,1723],{"class":1669},[1655,2527,2528],{"class":1665}," data",[1655,2530,2531],{"class":1741},"[",[1655,2533,2161],{"class":1665},[1655,2535,2536],{"class":1741},"])",[1655,2538,1697],{"class":1669},[1655,2540,2542,2544,2546],{"class":1657,"line":2541},23,[1655,2543,2349],{"class":1669},[1655,2545,1771],{"class":1741},[1655,2547,1697],{"class":1669},[1655,2549,2551],{"class":1657,"line":2550},24,[1655,2552,2460],{"class":1669},[1655,2554,2556],{"class":1657,"line":2555},25,[1655,2557,1704],{"emptyLinePlaceholder":1703},[1655,2559,2561,2564,2566,2569,2571],{"class":1657,"line":2560},26,[1655,2562,2563],{"class":1741},"    observeArray",[1655,2565,1761],{"class":1669},[1655,2567,2568],{"class":1802},"items",[1655,2570,1771],{"class":1669},[1655,2572,1735],{"class":1669},[1655,2574,2576,2579,2581,2583,2585,2587,2590,2592,2594,2597,2599,2601,2604],{"class":1657,"line":2575},27,[1655,2577,2578],{"class":1665},"        items",[1655,2580,1713],{"class":1669},[1655,2582,2497],{"class":1716},[1655,2584,1761],{"class":1741},[1655,2586,1761],{"class":1669},[1655,2588,2589],{"class":1802},"item",[1655,2591,1771],{"class":1669},[1655,2593,2508],{"class":1661},[1655,2595,2596],{"class":1716}," observe",[1655,2598,1761],{"class":1741},[1655,2600,2589],{"class":1665},[1655,2602,2603],{"class":1741},"))",[1655,2605,1697],{"class":1669},[1655,2607,2609],{"class":1657,"line":2608},28,[1655,2610,2460],{"class":1669},[1655,2612,2614],{"class":1657,"line":2613},29,[1655,2615,2197],{"class":1669},[1655,2617,2619],{"class":1657,"line":2618},30,[1655,2620,1704],{"emptyLinePlaceholder":1703},[1655,2622,2624,2626,2628,2630,2632,2634],{"class":1657,"line":2623},31,[1655,2625,1961],{"class":1661},[1655,2627,2596],{"class":1716},[1655,2629,1761],{"class":1669},[1655,2631,1607],{"class":1802},[1655,2633,1771],{"class":1669},[1655,2635,1735],{"class":1669},[1655,2637,2639,2642,2644,2647,2649,2652,2654,2657,2659,2662,2664,2666,2669,2671,2673],{"class":1657,"line":2638},32,[1655,2640,2641],{"class":1779},"    if",[1655,2643,2081],{"class":1741},[1655,2645,2646],{"class":1669},"typeof",[1655,2648,2528],{"class":1665},[1655,2650,2651],{"class":1669}," !==",[1655,2653,1687],{"class":1669},[1655,2655,2656],{"class":1690},"object",[1655,2658,1694],{"class":1669},[1655,2660,2661],{"class":1669}," ||",[1655,2663,2528],{"class":1665},[1655,2665,2086],{"class":1669},[1655,2667,2668],{"class":1669}," null",[1655,2670,2091],{"class":1741},[1655,2672,2094],{"class":1779},[1655,2674,1697],{"class":1669},[1655,2676,2678],{"class":1657,"line":2677},33,[1655,2679,2680],{"class":1883},"    // 已经观测过（有 __ob__）就直接复用，不再重复处理\n",[1655,2682,2684,2686,2688,2690,2692,2694,2696,2698,2700,2702,2704],{"class":1657,"line":2683},34,[1655,2685,2641],{"class":1779},[1655,2687,2081],{"class":1741},[1655,2689,1607],{"class":1665},[1655,2691,1713],{"class":1669},[1655,2693,2311],{"class":1665},[1655,2695,2091],{"class":1741},[1655,2697,2094],{"class":1779},[1655,2699,2528],{"class":1665},[1655,2701,1713],{"class":1669},[1655,2703,2311],{"class":1665},[1655,2705,1697],{"class":1669},[1655,2707,2709,2712,2715,2717,2719,2721,2723],{"class":1657,"line":2708},35,[1655,2710,2711],{"class":1779},"    return",[1655,2713,2714],{"class":1669}," new",[1655,2716,2271],{"class":1716},[1655,2718,1761],{"class":1741},[1655,2720,1607],{"class":1665},[1655,2722,1771],{"class":1741},[1655,2724,1697],{"class":1669},[1655,2726,2728],{"class":1657,"line":2727},36,[1655,2729,2197],{"class":1669},[1531,2731,2732,2733,2735],{},"这里的 ",[1542,2734,2311],{}," 是一个重要的细节：",[1535,2737,2738,2747],{},[1538,2739,2740,2743,2744,2746],{},[1571,2741,2742],{},"标记作用","：看到数据身上有 ",[1542,2745,2311],{},"，就知道它已经被观测过，直接跳过，避免重复包一层 getter/setter。",[1538,2748,2749,2754,2755,2757,2758,1552,2761,2764],{},[1571,2750,2751],{},[1542,2752,2753],{},"enumerable: false","：让 ",[1542,2756,2311],{}," 不出现在 ",[1542,2759,2760],{},"Object.keys",[1542,2762,2763],{},"for...in"," 的结果里，也不会参与后续的递归观测，防止干扰业务数据和造成死循环。",[1531,2766,2767,2768,2770],{},"把对象交给 ",[1542,2769,2231],{}," 之后，它身上的每一层属性都被装上了 getter/setter。读取时收集依赖，修改时触发更新，对象的响应式就完成了。",[1588,2772],{},[1526,2774,2776],{"id":2775},"数组的特殊处理重写七个方法","🧱 数组的特殊处理：重写七个方法",[1531,2778,2779,2780,2782],{},"对象可以靠 ",[1542,2781,1551],{}," 逐 key 拦截，但数组不行。如果给一个有几千个元素的数组逐下标加 getter/setter，性能开销太大，而且通过下标赋值是数组的高频操作，拦截收益很低。",[1531,2784,2785,2786,2796],{},"Vue2 换了个思路：",[1571,2787,2788,2789,1552,2792,2795],{},"数组的内容变化，几乎都是通过 ",[1542,2790,2791],{},"push",[1542,2793,2794],{},"splice"," 这些方法触发的，重写这些方法就够了。"," 具体做法是创建一个以数组原型为原型的新对象，在新对象上重写七个会改变原数组的方法，再把这个新对象设为响应式数组的原型：",[1645,2798,2800],{"className":1647,"code":2799,"language":1650,"meta":1651,"style":1651},"// 简化自 src/core/observer/array.js\nconst arrayProto = Array.prototype;\n// 以数组原型为原型，创建一个新对象\nconst arrayMethods = Object.create(arrayProto);\n\n// 七个会改变原数组的方法\nconst methodsToPatch = ['push', 'pop', 'shift', 'unshift', 'splice', 'sort', 'reverse'];\n\nmethodsToPatch.forEach((method) => {\n    const original = arrayProto[method];\n\n    arrayMethods[method] = function (...args) {\n        // 1. 先调用原方法，保证数组行为不变\n        const result = original.apply(this, args);\n\n        // 2. 对 push / unshift / splice 新插入的元素做观测\n        let inserted;\n        if (method === 'push' || method === 'unshift') {\n            inserted = args;\n        } else if (method === 'splice') {\n            inserted = args.slice(2); // splice 第三个参数起是新增元素\n        }\n        if (inserted) {\n            inserted.forEach((item) => observe(item));\n        }\n\n        // 3. 通知视图更新（同样先占位，下一篇细讲）\n        // ob.dep.notify()\n        console.log('数组变化了，触发更新');\n        return result;\n    };\n});\n\n// 把响应式数组的原型指向 arrayMethods\nfunction protoAugment(data, proto) {\n    Object.setPrototypeOf(data, proto);\n}\n",[1542,2801,2802,2807,2826,2831,2853,2857,2862,2938,2942,2964,2985,2989,3016,3021,3050,3054,3059,3069,3102,3113,3138,3164,3168,3181,3209,3213,3217,3222,3227,3248,3256,3261,3269,3273,3278,3298,3319],{"__ignoreMap":1651},[1655,2803,2804],{"class":1657,"line":1658},[1655,2805,2806],{"class":1883},"// 简化自 src/core/observer/array.js\n",[1655,2808,2809,2811,2814,2816,2819,2821,2824],{"class":1657,"line":1676},[1655,2810,1662],{"class":1661},[1655,2812,2813],{"class":1665}," arrayProto ",[1655,2815,1670],{"class":1669},[1655,2817,2818],{"class":2270}," Array",[1655,2820,1713],{"class":1669},[1655,2822,2823],{"class":1665},"prototype",[1655,2825,1697],{"class":1669},[1655,2827,2828],{"class":1657,"line":1700},[1655,2829,2830],{"class":1883},"// 以数组原型为原型，创建一个新对象\n",[1655,2832,2833,2835,2838,2840,2843,2845,2848,2851],{"class":1657,"line":1707},[1655,2834,1662],{"class":1661},[1655,2836,2837],{"class":1665}," arrayMethods ",[1655,2839,1670],{"class":1669},[1655,2841,2842],{"class":1665}," Object",[1655,2844,1713],{"class":1669},[1655,2846,2847],{"class":1716},"create",[1655,2849,2850],{"class":1665},"(arrayProto)",[1655,2852,1697],{"class":1669},[1655,2854,2855],{"class":1657,"line":1738},[1655,2856,1704],{"emptyLinePlaceholder":1703},[1655,2858,2859],{"class":1657,"line":1750},[1655,2860,2861],{"class":1883},"// 七个会改变原数组的方法\n",[1655,2863,2864,2866,2869,2871,2874,2876,2878,2880,2882,2884,2887,2889,2891,2893,2896,2898,2900,2902,2905,2907,2909,2911,2913,2915,2917,2919,2922,2924,2926,2928,2931,2933,2936],{"class":1657,"line":1776},[1655,2865,1662],{"class":1661},[1655,2867,2868],{"class":1665}," methodsToPatch ",[1655,2870,1670],{"class":1669},[1655,2872,2873],{"class":1665}," [",[1655,2875,1694],{"class":1669},[1655,2877,2791],{"class":1690},[1655,2879,1694],{"class":1669},[1655,2881,1723],{"class":1669},[1655,2883,1687],{"class":1669},[1655,2885,2886],{"class":1690},"pop",[1655,2888,1694],{"class":1669},[1655,2890,1723],{"class":1669},[1655,2892,1687],{"class":1669},[1655,2894,2895],{"class":1690},"shift",[1655,2897,1694],{"class":1669},[1655,2899,1723],{"class":1669},[1655,2901,1687],{"class":1669},[1655,2903,2904],{"class":1690},"unshift",[1655,2906,1694],{"class":1669},[1655,2908,1723],{"class":1669},[1655,2910,1687],{"class":1669},[1655,2912,2794],{"class":1690},[1655,2914,1694],{"class":1669},[1655,2916,1723],{"class":1669},[1655,2918,1687],{"class":1669},[1655,2920,2921],{"class":1690},"sort",[1655,2923,1694],{"class":1669},[1655,2925,1723],{"class":1669},[1655,2927,1687],{"class":1669},[1655,2929,2930],{"class":1690},"reverse",[1655,2932,1694],{"class":1669},[1655,2934,2935],{"class":1665},"]",[1655,2937,1697],{"class":1669},[1655,2939,2940],{"class":1657,"line":1788},[1655,2941,1704],{"emptyLinePlaceholder":1703},[1655,2943,2944,2947,2949,2951,2953,2955,2958,2960,2962],{"class":1657,"line":1794},[1655,2945,2946],{"class":1665},"methodsToPatch",[1655,2948,1713],{"class":1669},[1655,2950,2497],{"class":1716},[1655,2952,1761],{"class":1665},[1655,2954,1761],{"class":1669},[1655,2956,2957],{"class":1802},"method",[1655,2959,1771],{"class":1669},[1655,2961,2508],{"class":1661},[1655,2963,1735],{"class":1669},[1655,2965,2966,2969,2972,2974,2977,2979,2981,2983],{"class":1657,"line":1810},[1655,2967,2968],{"class":1661},"    const",[1655,2970,2971],{"class":1665}," original",[1655,2973,1843],{"class":1669},[1655,2975,2976],{"class":1665}," arrayProto",[1655,2978,2531],{"class":1741},[1655,2980,2957],{"class":1665},[1655,2982,2935],{"class":1741},[1655,2984,1697],{"class":1669},[1655,2986,2987],{"class":1657,"line":1837},[1655,2988,1704],{"emptyLinePlaceholder":1703},[1655,2990,2991,2994,2996,2998,3001,3003,3006,3009,3012,3014],{"class":1657,"line":1850},[1655,2992,2993],{"class":1665},"    arrayMethods",[1655,2995,2531],{"class":1741},[1655,2997,2957],{"class":1665},[1655,2999,3000],{"class":1741},"] ",[1655,3002,1670],{"class":1669},[1655,3004,3005],{"class":1661}," function",[1655,3007,3008],{"class":1669}," (...",[1655,3010,3011],{"class":1802},"args",[1655,3013,1771],{"class":1669},[1655,3015,1735],{"class":1669},[1655,3017,3018],{"class":1657,"line":1855},[1655,3019,3020],{"class":1883},"        // 1. 先调用原方法，保证数组行为不变\n",[1655,3022,3023,3026,3029,3031,3033,3035,3038,3040,3043,3046,3048],{"class":1657,"line":1865},[1655,3024,3025],{"class":1661},"        const",[1655,3027,3028],{"class":1665}," result",[1655,3030,1843],{"class":1669},[1655,3032,2971],{"class":1665},[1655,3034,1713],{"class":1669},[1655,3036,3037],{"class":1716},"apply",[1655,3039,1761],{"class":1741},[1655,3041,3042],{"class":1669},"this,",[1655,3044,3045],{"class":1665}," args",[1655,3047,1771],{"class":1741},[1655,3049,1697],{"class":1669},[1655,3051,3052],{"class":1657,"line":1870},[1655,3053,1704],{"emptyLinePlaceholder":1703},[1655,3055,3056],{"class":1657,"line":1887},[1655,3057,3058],{"class":1883},"        // 2. 对 push / unshift / splice 新插入的元素做观测\n",[1655,3060,3061,3064,3067],{"class":1657,"line":2128},[1655,3062,3063],{"class":1661},"        let",[1655,3065,3066],{"class":1665}," inserted",[1655,3068,1697],{"class":1669},[1655,3070,3071,3073,3075,3077,3079,3081,3083,3085,3087,3090,3092,3094,3096,3098,3100],{"class":1657,"line":2134},[1655,3072,2362],{"class":1779},[1655,3074,2081],{"class":1741},[1655,3076,2957],{"class":1665},[1655,3078,2086],{"class":1669},[1655,3080,1687],{"class":1669},[1655,3082,2791],{"class":1690},[1655,3084,1694],{"class":1669},[1655,3086,2661],{"class":1669},[1655,3088,3089],{"class":1665}," method",[1655,3091,2086],{"class":1669},[1655,3093,1687],{"class":1669},[1655,3095,2904],{"class":1690},[1655,3097,1694],{"class":1669},[1655,3099,2091],{"class":1741},[1655,3101,2382],{"class":1669},[1655,3103,3104,3107,3109,3111],{"class":1657,"line":2140},[1655,3105,3106],{"class":1665},"            inserted",[1655,3108,1843],{"class":1669},[1655,3110,3045],{"class":1665},[1655,3112,1697],{"class":1669},[1655,3114,3115,3117,3119,3122,3124,3126,3128,3130,3132,3134,3136],{"class":1657,"line":2179},[1655,3116,2349],{"class":1669},[1655,3118,2428],{"class":1779},[1655,3120,3121],{"class":1779}," if",[1655,3123,2081],{"class":1741},[1655,3125,2957],{"class":1665},[1655,3127,2086],{"class":1669},[1655,3129,1687],{"class":1669},[1655,3131,2794],{"class":1690},[1655,3133,1694],{"class":1669},[1655,3135,2091],{"class":1741},[1655,3137,2382],{"class":1669},[1655,3139,3140,3142,3144,3146,3148,3151,3153,3157,3159,3161],{"class":1657,"line":2184},[1655,3141,3106],{"class":1665},[1655,3143,1843],{"class":1669},[1655,3145,3045],{"class":1665},[1655,3147,1713],{"class":1669},[1655,3149,3150],{"class":1716},"slice",[1655,3152,1761],{"class":1741},[1655,3154,3156],{"class":3155},"smPcV","2",[1655,3158,1771],{"class":1741},[1655,3160,1880],{"class":1669},[1655,3162,3163],{"class":1883}," // splice 第三个参数起是新增元素\n",[1655,3165,3166],{"class":1657,"line":2194},[1655,3167,2455],{"class":1669},[1655,3169,3170,3172,3174,3177,3179],{"class":1657,"line":2541},[1655,3171,2362],{"class":1779},[1655,3173,2081],{"class":1741},[1655,3175,3176],{"class":1665},"inserted",[1655,3178,2091],{"class":1741},[1655,3180,2382],{"class":1669},[1655,3182,3183,3185,3187,3189,3191,3193,3195,3197,3199,3201,3203,3205,3207],{"class":1657,"line":2550},[1655,3184,3106],{"class":1665},[1655,3186,1713],{"class":1669},[1655,3188,2497],{"class":1716},[1655,3190,1761],{"class":1741},[1655,3192,1761],{"class":1669},[1655,3194,2589],{"class":1802},[1655,3196,1771],{"class":1669},[1655,3198,2508],{"class":1661},[1655,3200,2596],{"class":1716},[1655,3202,1761],{"class":1741},[1655,3204,2589],{"class":1665},[1655,3206,2603],{"class":1741},[1655,3208,1697],{"class":1669},[1655,3210,3211],{"class":1657,"line":2555},[1655,3212,2455],{"class":1669},[1655,3214,3215],{"class":1657,"line":2560},[1655,3216,1704],{"emptyLinePlaceholder":1703},[1655,3218,3219],{"class":1657,"line":2575},[1655,3220,3221],{"class":1883},"        // 3. 通知视图更新（同样先占位，下一篇细讲）\n",[1655,3223,3224],{"class":1657,"line":2608},[1655,3225,3226],{"class":1883},"        // ob.dep.notify()\n",[1655,3228,3229,3231,3233,3235,3237,3239,3242,3244,3246],{"class":1657,"line":2613},[1655,3230,1753],{"class":1665},[1655,3232,1713],{"class":1669},[1655,3234,1758],{"class":1716},[1655,3236,1761],{"class":1741},[1655,3238,1694],{"class":1669},[1655,3240,3241],{"class":1690},"数组变化了，触发更新",[1655,3243,1694],{"class":1669},[1655,3245,1771],{"class":1741},[1655,3247,1697],{"class":1669},[1655,3249,3250,3252,3254],{"class":1657,"line":2618},[1655,3251,1780],{"class":1779},[1655,3253,3028],{"class":1665},[1655,3255,1697],{"class":1669},[1655,3257,3258],{"class":1657,"line":2623},[1655,3259,3260],{"class":1669},"    };\n",[1655,3262,3263,3265,3267],{"class":1657,"line":2638},[1655,3264,1858],{"class":1669},[1655,3266,1771],{"class":1665},[1655,3268,1697],{"class":1669},[1655,3270,3271],{"class":1657,"line":2677},[1655,3272,1704],{"emptyLinePlaceholder":1703},[1655,3274,3275],{"class":1657,"line":2683},[1655,3276,3277],{"class":1883},"// 把响应式数组的原型指向 arrayMethods\n",[1655,3279,3280,3282,3285,3287,3289,3291,3294,3296],{"class":1657,"line":2708},[1655,3281,1961],{"class":1661},[1655,3283,3284],{"class":1716}," protoAugment",[1655,3286,1761],{"class":1669},[1655,3288,1607],{"class":1802},[1655,3290,1723],{"class":1669},[1655,3292,3293],{"class":1802}," proto",[1655,3295,1771],{"class":1669},[1655,3297,1735],{"class":1669},[1655,3299,3300,3302,3304,3307,3309,3311,3313,3315,3317],{"class":1657,"line":2727},[1655,3301,2011],{"class":1665},[1655,3303,1713],{"class":1669},[1655,3305,3306],{"class":1716},"setPrototypeOf",[1655,3308,1761],{"class":1741},[1655,3310,1607],{"class":1665},[1655,3312,1723],{"class":1669},[1655,3314,3293],{"class":1665},[1655,3316,1771],{"class":1741},[1655,3318,1697],{"class":1669},[1655,3320,3322],{"class":1657,"line":3321},37,[1655,3323,2197],{"class":1669},[1531,3325,3326,3327,3330,3331,3334,3335,3338,3339,3342,3343,3346],{},"用一个比喻帮助理解：普通数组的原型链是 ",[1542,3328,3329],{},"数组 -> Array.prototype","。改造后变成 ",[1542,3332,3333],{},"数组 -> arrayMethods -> Array.prototype","。调用 ",[1542,3336,3337],{},"list.push()"," 时，先命中 ",[1542,3340,3341],{},"arrayMethods"," 上重写的版本，执行完拦截逻辑后，再转发给 ",[1542,3344,3345],{},"Array.prototype"," 上的原版方法。",[1531,3348,3349],{},"这样设计带来两个能力：",[1535,3351,3352,3364],{},[1538,3353,3354,2208,3357,3360,3361,3363],{},[1571,3355,3356],{},"拦截变更",[1542,3358,3359],{},"list.push(4)"," 能触发更新，因为 ",[1542,3362,2791],{}," 被我们重写过。",[1538,3365,3366,2252,3369,3371,3372,3374],{},[1571,3367,3368],{},"新增元素也是响应式的",[1542,3370,2791],{}," 进去一个对象，会被 ",[1542,3373,2231],{}," 处理，之后改它的属性照样能触发更新。",[1531,3376,3377,3378,1552,3381,3384],{},"没有改动数组行为本身，",[1542,3379,3380],{},"list.length",[1542,3382,3383],{},"for"," 循环这些照常工作，只是原型链上多了一层「哨兵」。",[1588,3386],{},[1526,3388,3390],{"id":3389},"️-两个经典局限","⚠️ 两个经典局限",[1531,3392,3393,3395,3396,3399],{},[1542,3394,1717],{}," 这套方案有一个硬伤：",[1571,3397,3398],{},"它只能拦截对象上「已经存在」的 key","。这导致了两个经典局限，实际开发中很容易踩到。",[3401,3402,3404],"h3",{"id":3403},"局限一对象新增属性不触发响应","局限一：对象新增属性不触发响应",[1645,3406,3408],{"className":1647,"code":3407,"language":1650,"meta":1651,"style":1651},"data() {\n    return {\n        user: { name: 'noxussj' },\n    };\n},\nmounted() {\n    // user 上没有 age 这个 key，新增它不会触发更新\n    this.user.age = 18;\n},\n",[1542,3409,3410,3419,3425,3448,3452,3457,3466,3471,3490],{"__ignoreMap":1651},[1655,3411,3412,3414,3417],{"class":1657,"line":1658},[1655,3413,1607],{"class":1716},[1655,3415,3416],{"class":1665},"() ",[1655,3418,2382],{"class":1669},[1655,3420,3421,3423],{"class":1657,"line":1676},[1655,3422,2711],{"class":1779},[1655,3424,1735],{"class":1669},[1655,3426,3427,3430,3432,3435,3437,3439,3441,3443,3445],{"class":1657,"line":1700},[1655,3428,3429],{"class":1741},"        user",[1655,3431,2325],{"class":1669},[1655,3433,3434],{"class":1669}," {",[1655,3436,1783],{"class":1741},[1655,3438,2325],{"class":1669},[1655,3440,1687],{"class":1669},[1655,3442,1691],{"class":1690},[1655,3444,1694],{"class":1669},[1655,3446,3447],{"class":1669}," },\n",[1655,3449,3450],{"class":1657,"line":1707},[1655,3451,3260],{"class":1669},[1655,3453,3454],{"class":1657,"line":1738},[1655,3455,3456],{"class":1669},"},\n",[1655,3458,3459,3462,3464],{"class":1657,"line":1750},[1655,3460,3461],{"class":1716},"mounted",[1655,3463,3416],{"class":1665},[1655,3465,2382],{"class":1669},[1655,3467,3468],{"class":1657,"line":1776},[1655,3469,3470],{"class":1883},"    // user 上没有 age 这个 key，新增它不会触发更新\n",[1655,3472,3473,3476,3478,3480,3483,3485,3488],{"class":1657,"line":1788},[1655,3474,3475],{"class":1669},"    this.",[1655,3477,1873],{"class":1665},[1655,3479,1713],{"class":1669},[1655,3481,3482],{"class":1665},"age",[1655,3484,1843],{"class":1669},[1655,3486,3487],{"class":3155}," 18",[1655,3489,1697],{"class":1669},[1655,3491,3492],{"class":1657,"line":1794},[1655,3493,3456],{"class":1669},[1531,3495,3496,3497,3499,3500,3502],{},"原因是 ",[1542,3498,2442],{}," 只在初始化时遍历了已有的 key，",[1542,3501,3482],{}," 是后来才出现的，身上没有 getter/setter，Vue 感知不到。",[1531,3504,3505,3506,3508,3509,3512],{},"解决办法是用 ",[1542,3507,1565],{},"（组件内是 ",[1542,3510,3511],{},"this.$set","），它会手动把新属性变成响应式并触发更新：",[1645,3514,3516],{"className":1647,"code":3515,"language":1650,"meta":1651,"style":1651},"this.$set(this.user, 'age', 18);\n",[1542,3517,3518],{"__ignoreMap":1651},[1655,3519,3520,3523,3526,3528,3530,3532,3534,3536,3538,3540,3542,3544,3546],{"class":1657,"line":1658},[1655,3521,3522],{"class":1669},"this.",[1655,3524,3525],{"class":1716},"$set",[1655,3527,1761],{"class":1665},[1655,3529,3522],{"class":1669},[1655,3531,1873],{"class":1665},[1655,3533,1723],{"class":1669},[1655,3535,1687],{"class":1669},[1655,3537,3482],{"class":1690},[1655,3539,1694],{"class":1669},[1655,3541,1723],{"class":1669},[1655,3543,3487],{"class":3155},[1655,3545,1771],{"class":1665},[1655,3547,1697],{"class":1669},[3401,3549,3551],{"id":3550},"局限二数组通过下标赋值或改-length-不触发响应","局限二：数组通过下标赋值或改 length 不触发响应",[1645,3553,3555],{"className":1647,"code":3554,"language":1650,"meta":1651,"style":1651},"// 这两种写法都不会触发更新\nthis.list[0] = '新值';\nthis.list.length = 0;\n",[1542,3556,3557,3562,3585],{"__ignoreMap":1651},[1655,3558,3559],{"class":1657,"line":1658},[1655,3560,3561],{"class":1883},"// 这两种写法都不会触发更新\n",[1655,3563,3564,3566,3569,3572,3574,3576,3578,3581,3583],{"class":1657,"line":1676},[1655,3565,3522],{"class":1669},[1655,3567,3568],{"class":1665},"list[",[1655,3570,3571],{"class":3155},"0",[1655,3573,3000],{"class":1665},[1655,3575,1670],{"class":1669},[1655,3577,1687],{"class":1669},[1655,3579,3580],{"class":1690},"新值",[1655,3582,1694],{"class":1669},[1655,3584,1697],{"class":1669},[1655,3586,3587,3589,3592,3594,3597,3599,3602],{"class":1657,"line":1700},[1655,3588,3522],{"class":1669},[1655,3590,3591],{"class":1665},"list",[1655,3593,1713],{"class":1669},[1655,3595,3596],{"class":1665},"length ",[1655,3598,1670],{"class":1669},[1655,3600,3601],{"class":3155}," 0",[1655,3603,1697],{"class":1669},[1531,3605,3606,3607,3610],{},"上一节说过，数组的下标没有被逐个拦截（性能考虑），所以直接按下标赋值绕开了所有拦截逻辑，",[1542,3608,3609],{},"length"," 也不是被重写的七个方法之一。",[1531,3612,3613,3614,3616,3617,2252],{},"解决办法同样用 ",[1542,3615,3525],{},"，或者用被重写过的 ",[1542,3618,2794],{},[1645,3620,3622],{"className":1647,"code":3621,"language":1650,"meta":1651,"style":1651},"this.$set(this.list, 0, '新值');\n// 或者\nthis.list.splice(0, 1, '新值');\n\n// 清空数组\nthis.list.splice(0);\n",[1542,3623,3624,3652,3657,3688,3692,3697],{"__ignoreMap":1651},[1655,3625,3626,3628,3630,3632,3634,3636,3638,3640,3642,3644,3646,3648,3650],{"class":1657,"line":1658},[1655,3627,3522],{"class":1669},[1655,3629,3525],{"class":1716},[1655,3631,1761],{"class":1665},[1655,3633,3522],{"class":1669},[1655,3635,3591],{"class":1665},[1655,3637,1723],{"class":1669},[1655,3639,3601],{"class":3155},[1655,3641,1723],{"class":1669},[1655,3643,1687],{"class":1669},[1655,3645,3580],{"class":1690},[1655,3647,1694],{"class":1669},[1655,3649,1771],{"class":1665},[1655,3651,1697],{"class":1669},[1655,3653,3654],{"class":1657,"line":1676},[1655,3655,3656],{"class":1883},"// 或者\n",[1655,3658,3659,3661,3663,3665,3667,3669,3671,3673,3676,3678,3680,3682,3684,3686],{"class":1657,"line":1700},[1655,3660,3522],{"class":1669},[1655,3662,3591],{"class":1665},[1655,3664,1713],{"class":1669},[1655,3666,2794],{"class":1716},[1655,3668,1761],{"class":1665},[1655,3670,3571],{"class":3155},[1655,3672,1723],{"class":1669},[1655,3674,3675],{"class":3155}," 1",[1655,3677,1723],{"class":1669},[1655,3679,1687],{"class":1669},[1655,3681,3580],{"class":1690},[1655,3683,1694],{"class":1669},[1655,3685,1771],{"class":1665},[1655,3687,1697],{"class":1669},[1655,3689,3690],{"class":1657,"line":1707},[1655,3691,1704],{"emptyLinePlaceholder":1703},[1655,3693,3694],{"class":1657,"line":1738},[1655,3695,3696],{"class":1883},"// 清空数组\n",[1655,3698,3699,3701,3703,3705,3707,3709,3711,3713],{"class":1657,"line":1750},[1655,3700,3522],{"class":1669},[1655,3702,3591],{"class":1665},[1655,3704,1713],{"class":1669},[1655,3706,2794],{"class":1716},[1655,3708,1761],{"class":1665},[1655,3710,3571],{"class":3155},[1655,3712,1771],{"class":1665},[1655,3714,1697],{"class":1669},[3716,3717,3718],"warning",{},[1531,3719,3720,3721,3723,3724,3726,3727,3730],{},"这两个局限是 Vue2 响应式的「知名陷阱」：视图不更新但数据明明变了，往往就是这两种写法导致的。遇到「新增属性」或「数组下标赋值」，请改用 ",[1542,3722,3511],{}," 或 ",[1542,3725,2794],{},"。Vue3 改用 ",[1542,3728,3729],{},"Proxy"," 重写响应式后，这两个问题就不存在了。",[1588,3732],{},[1526,3734,3736],{"id":3735},"小节总结","🧾 小节总结",[1535,3738,3739,3745,3752,3763,3769],{},[1538,3740,3741,3742,3744],{},"响应式的核心：读取时收集依赖，修改时触发更新，读写都靠 ",[1542,3743,1544],{}," 拦截。",[1538,3746,3747,3749,3750,1611],{},[1542,3748,1551],{}," 把单个属性变成响应式，并对嵌套对象递归 ",[1542,3751,2231],{},[1538,3753,3754,3756,3757,3759,3760,3762],{},[1542,3755,1555],{}," 遍历对象的每个 key 调 ",[1542,3758,1551],{},"，并用不可枚举的 ",[1542,3761,2311],{}," 标记已观测的数据。",[1538,3764,3765,3766,3768],{},"数组不拦截下标，而是重写 ",[1542,3767,2791],{}," 等七个方法：先调原方法，再观测新增元素，最后触发更新。",[1538,3770,3771,3772,3774,3775,3723,3777,3779],{},"两个经典局限：对象新增属性、数组下标赋值或改 ",[1542,3773,3609],{}," 都不触发更新，用 ",[1542,3776,3525],{},[1542,3778,2794],{}," 解决。",[1588,3781],{},[1526,3783,3785],{"id":3784},"知识问答","❓ 知识问答",[1531,3787,3788],{},[1571,3789,3790],{},"Q1：为什么 Vue2 不拦截数组的下标？",[1531,3792,3793],{},"A：主要是性能考虑。数组可能有成百上千个元素，逐个下标加 getter/setter 开销大，而下标赋值又不是高频操作。重写七个变更方法，就能覆盖绝大多数数组修改场景，性价比更高。",[1531,3795,3796],{},[1571,3797,3798,3799,3801],{},"Q2：",[1542,3800,2311],{}," 为什么要设置成不可枚举？",[1531,3803,3804,3805,1552,3807,3809,3810,3812,3813,3815],{},"A：如果可枚举，",[1542,3806,2760],{},[1542,3808,2763],{}," 都会多出一个 ",[1542,3811,2311],{},"，污染业务数据；更严重的是递归观测时会再次碰到它，可能造成死循环。设成 ",[1542,3814,2753],{}," 后它就「隐身」了，只作为标记存在。",[1531,3817,3818],{},[1571,3819,3820,3821,3823],{},"Q3：",[1542,3822,2791],{}," 进去的新对象，改它的属性能触发更新吗？",[1531,3825,3826,3827,3829,3830,3832],{},"A：能。重写的 ",[1542,3828,2791],{}," 里会对新插入的元素调 ",[1542,3831,2231],{},"，新对象同样被装上了 getter/setter，所以后续修改它的属性照常触发更新。",[1531,3834,3835],{},[1571,3836,3837],{},"Q4：Vue3 是怎么解决这两个局限的？",[1531,3839,3840,3841,3843,3844,1611,3846,3848,3849,3851],{},"A：Vue3 用 ",[1542,3842,3729],{}," 替代 ",[1542,3845,1544],{},[1542,3847,3729],{}," 拦截的是整个对象而不是单个 key，新增属性、数组下标赋值、改 ",[1542,3850,3609],{}," 都能被拦截到，这两个局限自然消失。",[1588,3853],{},[1526,3855,3857],{"id":3856},"小练习","🧪 小练习",[1531,3859,3860,3861,3864],{},"不查资料，补全下面两个函数，实现一个迷你响应式系统：数据被读取时打印「读取了 xxx」，被修改时打印「xxx 修改为：新值」。用 Node.js v22 保存为 ",[1542,3862,3863],{},".js"," 文件直接运行验证。",[1645,3866,3868],{"className":1647,"code":3867,"language":1650,"meta":1651,"style":1651},"function defineReactive(obj, key, val) {\n    // 请在这里编写代码\n}\n\nfunction observe(obj) {\n    // 请在这里编写代码（提示：遍历 obj 的每个 key）\n}\n\nconst data = { name: 'noxussj', age: 18 };\nobserve(data);\n\n// 期望输出：\n// 读取了 name\n// name 修改为: 小明\n// 读取了 age\nconsole.log(data.name);\ndata.name = '小明';\nconsole.log(data.age);\n",[1542,3869,3870,3892,3897,3901,3905,3919,3924,3928,3932,3965,3974,3978,3983,3988,3993,3998,4017,4035],{"__ignoreMap":1651},[1655,3871,3872,3874,3876,3878,3880,3882,3884,3886,3888,3890],{"class":1657,"line":1658},[1655,3873,1961],{"class":1661},[1655,3875,1964],{"class":1716},[1655,3877,1761],{"class":1669},[1655,3879,1969],{"class":1802},[1655,3881,1723],{"class":1669},[1655,3883,1974],{"class":1802},[1655,3885,1723],{"class":1669},[1655,3887,1979],{"class":1802},[1655,3889,1771],{"class":1669},[1655,3891,1735],{"class":1669},[1655,3893,3894],{"class":1657,"line":1676},[1655,3895,3896],{"class":1883},"    // 请在这里编写代码\n",[1655,3898,3899],{"class":1657,"line":1700},[1655,3900,2197],{"class":1669},[1655,3902,3903],{"class":1657,"line":1707},[1655,3904,1704],{"emptyLinePlaceholder":1703},[1655,3906,3907,3909,3911,3913,3915,3917],{"class":1657,"line":1738},[1655,3908,1961],{"class":1661},[1655,3910,2596],{"class":1716},[1655,3912,1761],{"class":1669},[1655,3914,1969],{"class":1802},[1655,3916,1771],{"class":1669},[1655,3918,1735],{"class":1669},[1655,3920,3921],{"class":1657,"line":1750},[1655,3922,3923],{"class":1883},"    // 请在这里编写代码（提示：遍历 obj 的每个 key）\n",[1655,3925,3926],{"class":1657,"line":1776},[1655,3927,2197],{"class":1669},[1655,3929,3930],{"class":1657,"line":1788},[1655,3931,1704],{"emptyLinePlaceholder":1703},[1655,3933,3934,3936,3939,3941,3943,3945,3947,3949,3951,3953,3955,3958,3960,3962],{"class":1657,"line":1794},[1655,3935,1662],{"class":1661},[1655,3937,3938],{"class":1665}," data ",[1655,3940,1670],{"class":1669},[1655,3942,3434],{"class":1669},[1655,3944,1783],{"class":1741},[1655,3946,2325],{"class":1669},[1655,3948,1687],{"class":1669},[1655,3950,1691],{"class":1690},[1655,3952,1694],{"class":1669},[1655,3954,1723],{"class":1669},[1655,3956,3957],{"class":1741}," age",[1655,3959,2325],{"class":1669},[1655,3961,3487],{"class":3155},[1655,3963,3964],{"class":1669}," };\n",[1655,3966,3967,3969,3972],{"class":1657,"line":1810},[1655,3968,2231],{"class":1716},[1655,3970,3971],{"class":1665},"(data)",[1655,3973,1697],{"class":1669},[1655,3975,3976],{"class":1657,"line":1837},[1655,3977,1704],{"emptyLinePlaceholder":1703},[1655,3979,3980],{"class":1657,"line":1850},[1655,3981,3982],{"class":1883},"// 期望输出：\n",[1655,3984,3985],{"class":1657,"line":1855},[1655,3986,3987],{"class":1883},"// 读取了 name\n",[1655,3989,3990],{"class":1657,"line":1865},[1655,3991,3992],{"class":1883},"// name 修改为: 小明\n",[1655,3994,3995],{"class":1657,"line":1870},[1655,3996,3997],{"class":1883},"// 读取了 age\n",[1655,3999,4000,4003,4005,4007,4010,4012,4015],{"class":1657,"line":1887},[1655,4001,4002],{"class":1665},"console",[1655,4004,1713],{"class":1669},[1655,4006,1758],{"class":1716},[1655,4008,4009],{"class":1665},"(data",[1655,4011,1713],{"class":1669},[1655,4013,4014],{"class":1665},"name)",[1655,4016,1697],{"class":1669},[1655,4018,4019,4021,4023,4025,4027,4029,4031,4033],{"class":1657,"line":2128},[1655,4020,1607],{"class":1665},[1655,4022,1713],{"class":1669},[1655,4024,1894],{"class":1665},[1655,4026,1670],{"class":1669},[1655,4028,1687],{"class":1669},[1655,4030,1901],{"class":1690},[1655,4032,1694],{"class":1669},[1655,4034,1697],{"class":1669},[1655,4036,4037,4039,4041,4043,4045,4047,4050],{"class":1657,"line":2134},[1655,4038,4002],{"class":1665},[1655,4040,1713],{"class":1669},[1655,4042,1758],{"class":1716},[1655,4044,4009],{"class":1665},[1655,4046,1713],{"class":1669},[1655,4048,4049],{"class":1665},"age)",[1655,4051,1697],{"class":1669},[1531,4053,4054,4055,4057,4058,4061,4062,4065],{},"完成后给自己加个挑战：如果 ",[1542,4056,1607],{}," 里再嵌套一层对象（如 ",[1542,4059,4060],{},"info: { city: '杭州' }","），你的实现能让 ",[1542,4063,4064],{},"data.info.city"," 也打印日志吗？需要改动哪里？",[1588,4067],{},[1531,4069,4070],{},"🎉 恭喜你已经掌握 Vue2 响应式的核心原理啦！下一篇我们接着讲依赖收集与 Watcher，看看「谁在用这个数据」到底是怎么被登记下来的，以及更新是如何精确到具体节点的。",[4072,4073,4074],"style",{},"html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}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 .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sd2Uz, html code.shiki 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.smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":1651,"searchDepth":1676,"depth":1676,"links":4076},[4077,4078,4079,4080,4081,4082,4083,4087,4088,4089],{"id":1528,"depth":1676,"text":1529},{"id":1592,"depth":1676,"text":1593},{"id":1627,"depth":1676,"text":1628},{"id":1939,"depth":1676,"text":1940},{"id":2237,"depth":1676,"text":2238},{"id":2775,"depth":1676,"text":2776},{"id":3389,"depth":1676,"text":3390,"children":4084},[4085,4086],{"id":3403,"depth":1700,"text":3404},{"id":3550,"depth":1700,"text":3551},{"id":3735,"depth":1676,"text":3736},{"id":3784,"depth":1676,"text":3785},{"id":3856,"depth":1676,"text":3857},"掌握 Vue2 响应式的核心实现，理解 defineReactive、Observer 与数组方法拦截的工作原理。","md",null,{},{"title":1395},{"title":1521,"description":4090},"iehPgU10M0",[4098,4100],{"title":1391,"path":1392,"stem":1393,"description":4099,"children":-1},"梳理从 new Vue 到页面渲染的完整初始化流程，理解 _init 与 $mount 内部的执行顺序。",{"title":1399,"path":1400,"stem":1401,"description":4101,"children":-1},"理解 Dep 与 Watcher 的分工，掌握依赖收集和派发更新的完整链路。",1784715111887]