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key",[1601,1671,1646],{"class":1629},[1601,1673,1674],{"class":1642}," componentOptions",[1601,1676,1677],{"class":1629},")",[1601,1679,1630],{"class":1629},[1601,1681,1683,1686,1689,1692,1695],{"class":1603,"line":1682},4,[1601,1684,1685],{"class":1629},"        this.",[1601,1687,1643],{"class":1688},"sndM8",[1601,1690,1691],{"class":1629}," =",[1601,1693,1694],{"class":1688}," tag",[1601,1696,1697],{"class":1607}," // 标签名，如 'div'，组件节点则为 undefined\n",[1601,1699,1701,1703,1706,1708,1710],{"class":1603,"line":1700},5,[1601,1702,1685],{"class":1629},[1601,1704,1705],{"class":1688},"data",[1601,1707,1691],{"class":1629},[1601,1709,1649],{"class":1688},[1601,1711,1712],{"class":1607}," // 属性、事件、class 等数据对象\n",[1601,1714,1716,1718,1721,1723,1725],{"class":1603,"line":1715},6,[1601,1717,1685],{"class":1629},[1601,1719,1720],{"class":1688},"children",[1601,1722,1691],{"class":1629},[1601,1724,1654],{"class":1688},[1601,1726,1727],{"class":1607}," // 子 VNode 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节点的唯一标识\n",[1601,1774,1776,1778,1781,1783,1785],{"class":1603,"line":1775},10,[1601,1777,1685],{"class":1629},[1601,1779,1780],{"class":1688},"componentOptions",[1601,1782,1691],{"class":1629},[1601,1784,1674],{"class":1688},[1601,1786,1787],{"class":1607}," // 组件节点的选项（组件专用）\n",[1601,1789,1791],{"class":1603,"line":1790},11,[1601,1792,1793],{"class":1629},"    }\n",[1601,1795,1797],{"class":1603,"line":1796},12,[1601,1798,1799],{"class":1629},"}\n",[1531,1801,1802],{},"看一个具体例子就明白了。下面这个真实 DOM：",[1592,1804,1808],{"className":1805,"code":1806,"language":1807,"meta":1597,"style":1597},"language-html shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cdiv id=\"app\">\n    \u003Cp>hello\u003C/p>\n\u003C/div>\n","html",[1561,1809,1810,1837,1857],{"__ignoreMap":1597},[1601,1811,1812,1815,1819,1822,1825,1828,1832,1834],{"class":1603,"line":1604},[1601,1813,1814],{"class":1629},"\u003C",[1601,1816,1818],{"class":1817},"sd2Uz","div",[1601,1820,1821],{"class":1621}," id",[1601,1823,1824],{"class":1629},"=",[1601,1826,1827],{"class":1629},"\"",[1601,1829,1831],{"class":1830},"sIEYB","app",[1601,1833,1827],{"class":1629},[1601,1835,1836],{"class":1629},">\n",[1601,1838,1839,1842,1844,1847,1850,1853,1855],{"class":1603,"line":1611},[1601,1840,1841],{"class":1629},"    \u003C",[1601,1843,1531],{"class":1817},[1601,1845,1846],{"class":1629},">",[1601,1848,1849],{"class":1688},"hello",[1601,1851,1852],{"class":1629},"\u003C/",[1601,1854,1531],{"class":1817},[1601,1856,1836],{"class":1629},[1601,1858,1859,1861,1863],{"class":1603,"line":1633},[1601,1860,1852],{"class":1629},[1601,1862,1818],{"class":1817},[1601,1864,1836],{"class":1629},[1531,1866,1867],{},"对应的 VNode 大致是：",[1592,1869,1871],{"className":1594,"code":1870,"language":1596,"meta":1597,"style":1597},"{\n    tag: 'div',\n    data: { attrs: { id: 'app' } },\n    children: [\n        {\n            tag: 'p',\n            data: undefined,\n            children: undefined,\n            text: undefined,\n            elm: undefined // 渲染后会被赋值为真实的 \u003Cp> 元素\n        }\n    ]\n}\n",[1561,1872,1873,1878,1897,1930,1940,1945,1960,1970,1979,1988,2001,2006,2011],{"__ignoreMap":1597},[1601,1874,1875],{"class":1603,"line":1604},[1601,1876,1877],{"class":1629},"{\n",[1601,1879,1880,1883,1886,1889,1891,1894],{"class":1603,"line":1611},[1601,1881,1882],{"class":1625},"    tag",[1601,1884,1885],{"class":1629},":",[1601,1887,1888],{"class":1629}," '",[1601,1890,1818],{"class":1830},[1601,1892,1893],{"class":1629},"'",[1601,1895,1896],{"class":1629},",\n",[1601,1898,1899,1902,1904,1907,1910,1912,1914,1916,1918,1920,1922,1924,1927],{"class":1603,"line":1633},[1601,1900,1901],{"class":1625},"    data",[1601,1903,1885],{"class":1629},[1601,1905,1906],{"class":1629}," {",[1601,1908,1909],{"class":1625}," attrs",[1601,1911,1885],{"class":1629},[1601,1913,1906],{"class":1629},[1601,1915,1821],{"class":1625},[1601,1917,1885],{"class":1629},[1601,1919,1888],{"class":1629},[1601,1921,1831],{"class":1830},[1601,1923,1893],{"class":1629},[1601,1925,1926],{"class":1629}," }",[1601,1928,1929],{"class":1629}," },\n",[1601,1931,1932,1935,1937],{"class":1603,"line":1682},[1601,1933,1934],{"class":1625},"    children",[1601,1936,1885],{"class":1629},[1601,1938,1939],{"class":1817}," [\n",[1601,1941,1942],{"class":1603,"line":1700},[1601,1943,1944],{"class":1629},"        {\n",[1601,1946,1947,1950,1952,1954,1956,1958],{"class":1603,"line":1715},[1601,1948,1949],{"class":1817},"            tag",[1601,1951,1885],{"class":1629},[1601,1953,1888],{"class":1629},[1601,1955,1531],{"class":1830},[1601,1957,1893],{"class":1629},[1601,1959,1896],{"class":1629},[1601,1961,1962,1965,1967],{"class":1603,"line":1730},[1601,1963,1964],{"class":1817},"            data",[1601,1966,1885],{"class":1629},[1601,1968,1969],{"class":1629}," undefined,\n",[1601,1971,1972,1975,1977],{"class":1603,"line":1745},[1601,1973,1974],{"class":1817},"            children",[1601,1976,1885],{"class":1629},[1601,1978,1969],{"class":1629},[1601,1980,1981,1984,1986],{"class":1603,"line":1760},[1601,1982,1983],{"class":1817},"            text",[1601,1985,1885],{"class":1629},[1601,1987,1969],{"class":1629},[1601,1989,1990,1993,1995,1998],{"class":1603,"line":1775},[1601,1991,1992],{"class":1817},"            elm",[1601,1994,1885],{"class":1629},[1601,1996,1997],{"class":1629}," undefined",[1601,1999,2000],{"class":1607}," // 渲染后会被赋值为真实的 \u003Cp> 元素\n",[1601,2002,2003],{"class":1603,"line":1790},[1601,2004,2005],{"class":1629},"        }\n",[1601,2007,2008],{"class":1603,"line":1796},[1601,2009,2010],{"class":1817},"    ]\n",[1601,2012,2014],{"class":1603,"line":2013},13,[1601,2015,1799],{"class":1629},[1531,2017,2018,2019,2021,2022,2025,2026,2028],{},"其中 ",[1561,2020,1750],{}," 字段很关键：",[1535,2023,2024],{},"它是 VNode 和真实 DOM 之间的桥梁","。patch 创建出真实元素后，会把引用存回 ",[1561,2027,1750],{},"，后续更新时就能直接操作对应的真实节点，不用再满页面找。",[1543,2030],{},[1526,2032,2034],{"id":2033},"_render-与-_update从-render-函数到-patch","🧱 _render 与 _update：从 render 函数到 patch",[1531,2036,2037,2038,2041,2042,2045],{},"渲染分两步走，对应实例上的两个方法（简化自 ",[1561,2039,2040],{},"src/core/instance/render.js"," 与 ",[1561,2043,2044],{},"src/core/instance/lifecycle.js","）：",[1592,2047,2049],{"className":1594,"code":2048,"language":1596,"meta":1597,"style":1597},"// 第一步：执行 render 函数，生成 VNode 树\nVue.prototype._render = function () {\n    const vm = this\n    const { render } = vm.$options\n    // render 内部通过 $createElement（即 h 函数）创建 VNode\n    const vnode = render.call(vm, vm.$createElement)\n    return vnode\n}\n\n// 第二步：把 VNode 变成真实 DOM\nVue.prototype._update = function (vnode) {\n    const vm = this\n    const prevVnode = vm._vnode\n    vm._vnode = vnode\n    if (!prevVnode) {\n        // 首次渲染：oldVnode 是真实的挂载点元素\n        vm.$el = vm.__patch__(vm.$el, vnode)\n    } else {\n        // 更新渲染：oldVnode 是上一棵 VNode 树\n        vm.$el = vm.__patch__(prevVnode, vnode)\n    }\n}\n",[1561,2050,2051,2056,2083,2096,2116,2121,2154,2162,2166,2172,2177,2204,2214,2230,2245,2264,2270,2304,2315,2321,2348,2353],{"__ignoreMap":1597},[1601,2052,2053],{"class":1603,"line":1604},[1601,2054,2055],{"class":1607},"// 第一步：执行 render 函数，生成 VNode 树\n",[1601,2057,2058,2061,2064,2067,2069,2073,2075,2078,2081],{"class":1603,"line":1611},[1601,2059,2060],{"class":1625},"Vue",[1601,2062,2063],{"class":1629},".",[1601,2065,2066],{"class":1688},"prototype",[1601,2068,2063],{"class":1629},[1601,2070,2072],{"class":2071},"swgpB","_render",[1601,2074,1691],{"class":1629},[1601,2076,2077],{"class":1621}," function",[1601,2079,2080],{"class":1629}," ()",[1601,2082,1630],{"class":1629},[1601,2084,2085,2088,2091,2093],{"class":1603,"line":1633},[1601,2086,2087],{"class":1621},"    const",[1601,2089,2090],{"class":1688}," vm",[1601,2092,1691],{"class":1629},[1601,2094,2095],{"class":1629}," this\n",[1601,2097,2098,2100,2102,2105,2107,2109,2111,2113],{"class":1603,"line":1682},[1601,2099,2087],{"class":1621},[1601,2101,1906],{"class":1629},[1601,2103,2104],{"class":1688}," render",[1601,2106,1926],{"class":1629},[1601,2108,1691],{"class":1629},[1601,2110,2090],{"class":1688},[1601,2112,2063],{"class":1629},[1601,2114,2115],{"class":1688},"$options\n",[1601,2117,2118],{"class":1603,"line":1700},[1601,2119,2120],{"class":1607},"    // render 内部通过 $createElement（即 h 函数）创建 VNode\n",[1601,2122,2123,2125,2128,2130,2132,2134,2137,2139,2142,2144,2146,2148,2151],{"class":1603,"line":1715},[1601,2124,2087],{"class":1621},[1601,2126,2127],{"class":1688}," vnode",[1601,2129,1691],{"class":1629},[1601,2131,2104],{"class":1688},[1601,2133,2063],{"class":1629},[1601,2135,2136],{"class":2071},"call",[1601,2138,1639],{"class":1817},[1601,2140,2141],{"class":1688},"vm",[1601,2143,1646],{"class":1629},[1601,2145,2090],{"class":1688},[1601,2147,2063],{"class":1629},[1601,2149,2150],{"class":1688},"$createElement",[1601,2152,2153],{"class":1817},")\n",[1601,2155,2156,2159],{"class":1603,"line":1730},[1601,2157,2158],{"class":1614},"    return",[1601,2160,2161],{"class":1688}," vnode\n",[1601,2163,2164],{"class":1603,"line":1745},[1601,2165,1799],{"class":1629},[1601,2167,2168],{"class":1603,"line":1760},[1601,2169,2171],{"emptyLinePlaceholder":2170},true,"\n",[1601,2173,2174],{"class":1603,"line":1775},[1601,2175,2176],{"class":1607},"// 第二步：把 VNode 变成真实 DOM\n",[1601,2178,2179,2181,2183,2185,2187,2190,2192,2194,2197,2200,2202],{"class":1603,"line":1790},[1601,2180,2060],{"class":1625},[1601,2182,2063],{"class":1629},[1601,2184,2066],{"class":1688},[1601,2186,2063],{"class":1629},[1601,2188,2189],{"class":2071},"_update",[1601,2191,1691],{"class":1629},[1601,2193,2077],{"class":1621},[1601,2195,2196],{"class":1629}," (",[1601,2198,2199],{"class":1642},"vnode",[1601,2201,1677],{"class":1629},[1601,2203,1630],{"class":1629},[1601,2205,2206,2208,2210,2212],{"class":1603,"line":1796},[1601,2207,2087],{"class":1621},[1601,2209,2090],{"class":1688},[1601,2211,1691],{"class":1629},[1601,2213,2095],{"class":1629},[1601,2215,2216,2218,2221,2223,2225,2227],{"class":1603,"line":2013},[1601,2217,2087],{"class":1621},[1601,2219,2220],{"class":1688}," prevVnode",[1601,2222,1691],{"class":1629},[1601,2224,2090],{"class":1688},[1601,2226,2063],{"class":1629},[1601,2228,2229],{"class":1688},"_vnode\n",[1601,2231,2233,2236,2238,2241,2243],{"class":1603,"line":2232},14,[1601,2234,2235],{"class":1688},"    vm",[1601,2237,2063],{"class":1629},[1601,2239,2240],{"class":1688},"_vnode",[1601,2242,1691],{"class":1629},[1601,2244,2161],{"class":1688},[1601,2246,2248,2251,2253,2256,2259,2262],{"class":1603,"line":2247},15,[1601,2249,2250],{"class":1614},"    if",[1601,2252,2196],{"class":1817},[1601,2254,2255],{"class":1629},"!",[1601,2257,2258],{"class":1688},"prevVnode",[1601,2260,2261],{"class":1817},") ",[1601,2263,1877],{"class":1629},[1601,2265,2267],{"class":1603,"line":2266},16,[1601,2268,2269],{"class":1607},"        // 首次渲染：oldVnode 是真实的挂载点元素\n",[1601,2271,2273,2276,2278,2281,2283,2285,2287,2290,2292,2294,2296,2298,2300,2302],{"class":1603,"line":2272},17,[1601,2274,2275],{"class":1688},"        vm",[1601,2277,2063],{"class":1629},[1601,2279,2280],{"class":1688},"$el",[1601,2282,1691],{"class":1629},[1601,2284,2090],{"class":1688},[1601,2286,2063],{"class":1629},[1601,2288,2289],{"class":2071},"__patch__",[1601,2291,1639],{"class":1817},[1601,2293,2141],{"class":1688},[1601,2295,2063],{"class":1629},[1601,2297,2280],{"class":1688},[1601,2299,1646],{"class":1629},[1601,2301,2127],{"class":1688},[1601,2303,2153],{"class":1817},[1601,2305,2307,2310,2313],{"class":1603,"line":2306},18,[1601,2308,2309],{"class":1629},"    }",[1601,2311,2312],{"class":1614}," else",[1601,2314,1630],{"class":1629},[1601,2316,2318],{"class":1603,"line":2317},19,[1601,2319,2320],{"class":1607},"        // 更新渲染：oldVnode 是上一棵 VNode 树\n",[1601,2322,2324,2326,2328,2330,2332,2334,2336,2338,2340,2342,2344,2346],{"class":1603,"line":2323},20,[1601,2325,2275],{"class":1688},[1601,2327,2063],{"class":1629},[1601,2329,2280],{"class":1688},[1601,2331,1691],{"class":1629},[1601,2333,2090],{"class":1688},[1601,2335,2063],{"class":1629},[1601,2337,2289],{"class":2071},[1601,2339,1639],{"class":1817},[1601,2341,2258],{"class":1688},[1601,2343,1646],{"class":1629},[1601,2345,2127],{"class":1688},[1601,2347,2153],{"class":1817},[1601,2349,2351],{"class":1603,"line":2350},21,[1601,2352,1793],{"class":1629},[1601,2354,2356],{"class":1603,"line":2355},22,[1601,2357,1799],{"class":1629},[1531,2359,2360,2361,2374,2375,2377,2378,2380],{},"流程一句话概括：",[1535,2362,2363,2366,2367,2370,2371,2373],{},[1561,2364,2365],{},"_render()"," 产出 VNode，",[1561,2368,2369],{},"_update()"," 调 ",[1561,2372,2289],{}," 把它落到页面上","。注意 ",[1561,2376,2189],{}," 里的分支：首次渲染和更新渲染走的都是 ",[1561,2379,2289],{},"，只是传入的第一个参数不同，这正是下一节的内容。",[1543,2382],{},[1526,2384,2386],{"id":2385},"patch-的两条路径","🧱 patch 的两条路径",[1531,2388,2389,2391,2392,2395,2396,2399],{},[1561,2390,1537],{}," 的入口逻辑（简化自 ",[1561,2393,2394],{},"src/core/vdom/patch.js","）按 ",[1561,2397,2398],{},"oldVnode"," 的形态分两条路：",[1592,2401,2403],{"className":1594,"code":2402,"language":1596,"meta":1597,"style":1597},"// 简化自 src/core/vdom/patch.js\nfunction patch(oldVnode, vnode) {\n    if (!oldVnode) {\n        // 路径一：oldVnode 为空（如组件初次渲染）\n        // 没有可对比的对象，直接按 vnode 创建整棵 DOM\n        createElm(vnode)\n    } else {\n        if (sameVnode(oldVnode, vnode)) {\n            // 路径二：新旧节点是\"同一个\"，精细对比更新\n            patchVnode(oldVnode, vnode)\n        } else {\n            // 不是同一个节点：用 vnode 创建新元素，替换并销毁旧的\n            const elm = oldVnode.elm\n            const parentElm = elm.parentNode\n            createElm(vnode, parentElm, elm)\n            removeVnodes([oldVnode], 0, 0)\n        }\n    }\n    return vnode.elm\n}\n",[1561,2404,2405,2410,2430,2444,2449,2454,2465,2473,2496,2501,2516,2525,2530,2547,2563,2582,2607,2611,2615,2625],{"__ignoreMap":1597},[1601,2406,2407],{"class":1603,"line":1604},[1601,2408,2409],{"class":1607},"// 简化自 src/core/vdom/patch.js\n",[1601,2411,2412,2415,2418,2420,2422,2424,2426,2428],{"class":1603,"line":1611},[1601,2413,2414],{"class":1621},"function",[1601,2416,2417],{"class":2071}," patch",[1601,2419,1639],{"class":1629},[1601,2421,2398],{"class":1642},[1601,2423,1646],{"class":1629},[1601,2425,2127],{"class":1642},[1601,2427,1677],{"class":1629},[1601,2429,1630],{"class":1629},[1601,2431,2432,2434,2436,2438,2440,2442],{"class":1603,"line":1633},[1601,2433,2250],{"class":1614},[1601,2435,2196],{"class":1817},[1601,2437,2255],{"class":1629},[1601,2439,2398],{"class":1688},[1601,2441,2261],{"class":1817},[1601,2443,1877],{"class":1629},[1601,2445,2446],{"class":1603,"line":1682},[1601,2447,2448],{"class":1607},"        // 路径一：oldVnode 为空（如组件初次渲染）\n",[1601,2450,2451],{"class":1603,"line":1700},[1601,2452,2453],{"class":1607},"        // 没有可对比的对象，直接按 vnode 创建整棵 DOM\n",[1601,2455,2456,2459,2461,2463],{"class":1603,"line":1715},[1601,2457,2458],{"class":2071},"        createElm",[1601,2460,1639],{"class":1817},[1601,2462,2199],{"class":1688},[1601,2464,2153],{"class":1817},[1601,2466,2467,2469,2471],{"class":1603,"line":1730},[1601,2468,2309],{"class":1629},[1601,2470,2312],{"class":1614},[1601,2472,1630],{"class":1629},[1601,2474,2475,2478,2480,2483,2485,2487,2489,2491,2494],{"class":1603,"line":1745},[1601,2476,2477],{"class":1614},"        if",[1601,2479,2196],{"class":1817},[1601,2481,2482],{"class":2071},"sameVnode",[1601,2484,1639],{"class":1817},[1601,2486,2398],{"class":1688},[1601,2488,1646],{"class":1629},[1601,2490,2127],{"class":1688},[1601,2492,2493],{"class":1817},")) ",[1601,2495,1877],{"class":1629},[1601,2497,2498],{"class":1603,"line":1760},[1601,2499,2500],{"class":1607},"            // 路径二：新旧节点是\"同一个\"，精细对比更新\n",[1601,2502,2503,2506,2508,2510,2512,2514],{"class":1603,"line":1775},[1601,2504,2505],{"class":2071},"            patchVnode",[1601,2507,1639],{"class":1817},[1601,2509,2398],{"class":1688},[1601,2511,1646],{"class":1629},[1601,2513,2127],{"class":1688},[1601,2515,2153],{"class":1817},[1601,2517,2518,2521,2523],{"class":1603,"line":1790},[1601,2519,2520],{"class":1629},"        }",[1601,2522,2312],{"class":1614},[1601,2524,1630],{"class":1629},[1601,2526,2527],{"class":1603,"line":1796},[1601,2528,2529],{"class":1607},"            // 不是同一个节点：用 vnode 创建新元素，替换并销毁旧的\n",[1601,2531,2532,2535,2537,2539,2542,2544],{"class":1603,"line":2013},[1601,2533,2534],{"class":1621},"            const",[1601,2536,1664],{"class":1688},[1601,2538,1691],{"class":1629},[1601,2540,2541],{"class":1688}," oldVnode",[1601,2543,2063],{"class":1629},[1601,2545,2546],{"class":1688},"elm\n",[1601,2548,2549,2551,2554,2556,2558,2560],{"class":1603,"line":2232},[1601,2550,2534],{"class":1621},[1601,2552,2553],{"class":1688}," parentElm",[1601,2555,1691],{"class":1629},[1601,2557,1664],{"class":1688},[1601,2559,2063],{"class":1629},[1601,2561,2562],{"class":1688},"parentNode\n",[1601,2564,2565,2568,2570,2572,2574,2576,2578,2580],{"class":1603,"line":2247},[1601,2566,2567],{"class":2071},"            createElm",[1601,2569,1639],{"class":1817},[1601,2571,2199],{"class":1688},[1601,2573,1646],{"class":1629},[1601,2575,2553],{"class":1688},[1601,2577,1646],{"class":1629},[1601,2579,1664],{"class":1688},[1601,2581,2153],{"class":1817},[1601,2583,2584,2587,2590,2592,2595,2597,2601,2603,2605],{"class":1603,"line":2266},[1601,2585,2586],{"class":2071},"            removeVnodes",[1601,2588,2589],{"class":1817},"([",[1601,2591,2398],{"class":1688},[1601,2593,2594],{"class":1817},"]",[1601,2596,1646],{"class":1629},[1601,2598,2600],{"class":2599},"smPcV"," 0",[1601,2602,1646],{"class":1629},[1601,2604,2600],{"class":2599},[1601,2606,2153],{"class":1817},[1601,2608,2609],{"class":1603,"line":2272},[1601,2610,2005],{"class":1629},[1601,2612,2613],{"class":1603,"line":2306},[1601,2614,1793],{"class":1629},[1601,2616,2617,2619,2621,2623],{"class":1603,"line":2317},[1601,2618,2158],{"class":1614},[1601,2620,2127],{"class":1688},[1601,2622,2063],{"class":1629},[1601,2624,2546],{"class":1688},[1601,2626,2627],{"class":1603,"line":2323},[1601,2628,1799],{"class":1629},[2630,2631,2632,2646],"ul",{},[2633,2634,2635,2638,2639,2641,2642,2645],"li",{},[1535,2636,2637],{},"首次渲染","：",[1561,2640,2398],{}," 是空的（或是待替换的挂载点），没有对比的意义，直接 ",[1561,2643,2644],{},"createElm"," 递归创建整棵 DOM 树插入页面。",[2633,2647,2648,2651,2652,2654],{},[1535,2649,2650],{},"更新渲染","：新旧两棵 VNode 树都在，先过 ",[1561,2653,2482],{}," 这关，决定是\"复用更新\"还是\"销毁重建\"。",[1543,2656],{},[1526,2658,2660],{"id":2659},"️-samevnode-与-patchvnode","⚖️ sameVnode 与 patchVnode",[2662,2663,2665],"h3",{"id":2664},"samevnode是不是同一个节点","sameVnode：是不是同一个节点",[1592,2667,2669],{"className":1594,"code":2668,"language":1596,"meta":1597,"style":1597},"// 简化自 src/core/vdom/patch.js\nfunction sameVnode(a, b) {\n    return (\n        a.key === b.key &&\n        a.tag === b.tag &&\n        // 双方同为注释节点、都定义了 data 等辅助判断\n        isDef(a.data) === isDef(b.data)\n    )\n}\n",[1561,2670,2671,2675,2695,2702,2723,2741,2746,2778,2783],{"__ignoreMap":1597},[1601,2672,2673],{"class":1603,"line":1604},[1601,2674,2409],{"class":1607},[1601,2676,2677,2679,2682,2684,2686,2688,2691,2693],{"class":1603,"line":1611},[1601,2678,2414],{"class":1621},[1601,2680,2681],{"class":2071}," sameVnode",[1601,2683,1639],{"class":1629},[1601,2685,1556],{"class":1642},[1601,2687,1646],{"class":1629},[1601,2689,2690],{"class":1642}," b",[1601,2692,1677],{"class":1629},[1601,2694,1630],{"class":1629},[1601,2696,2697,2699],{"class":1603,"line":1633},[1601,2698,2158],{"class":1614},[1601,2700,2701],{"class":1817}," (\n",[1601,2703,2704,2707,2709,2711,2714,2716,2718,2720],{"class":1603,"line":1682},[1601,2705,2706],{"class":1688},"        a",[1601,2708,2063],{"class":1629},[1601,2710,1765],{"class":1688},[1601,2712,2713],{"class":1629}," ===",[1601,2715,2690],{"class":1688},[1601,2717,2063],{"class":1629},[1601,2719,1765],{"class":1688},[1601,2721,2722],{"class":1629}," &&\n",[1601,2724,2725,2727,2729,2731,2733,2735,2737,2739],{"class":1603,"line":1700},[1601,2726,2706],{"class":1688},[1601,2728,2063],{"class":1629},[1601,2730,1643],{"class":1688},[1601,2732,2713],{"class":1629},[1601,2734,2690],{"class":1688},[1601,2736,2063],{"class":1629},[1601,2738,1643],{"class":1688},[1601,2740,2722],{"class":1629},[1601,2742,2743],{"class":1603,"line":1715},[1601,2744,2745],{"class":1607},"        // 双方同为注释节点、都定义了 data 等辅助判断\n",[1601,2747,2748,2751,2753,2755,2757,2759,2761,2764,2767,2769,2772,2774,2776],{"class":1603,"line":1730},[1601,2749,2750],{"class":2071},"        isDef",[1601,2752,1639],{"class":1817},[1601,2754,1556],{"class":1688},[1601,2756,2063],{"class":1629},[1601,2758,1705],{"class":1688},[1601,2760,2261],{"class":1817},[1601,2762,2763],{"class":1629},"===",[1601,2765,2766],{"class":2071}," isDef",[1601,2768,1639],{"class":1817},[1601,2770,2771],{"class":1688},"b",[1601,2773,2063],{"class":1629},[1601,2775,1705],{"class":1688},[1601,2777,2153],{"class":1817},[1601,2779,2780],{"class":1603,"line":1745},[1601,2781,2782],{"class":1817},"    )\n",[1601,2784,2785],{"class":1603,"line":1760},[1601,2786,1799],{"class":1629},[1531,2788,2789,2790,2793],{},"核心就两条：",[1535,2791,2792],{},"key 相同、tag 相同","。判断结果决定更新路径：",[2630,2795,2796,2803],{},[2633,2797,2798,2799,2802],{},"相同 → 进入 ",[1561,2800,2801],{},"patchVnode","，复用真实元素，只更新内容。",[2633,2804,2805],{},"不同 → 旧元素销毁，新元素重建。",[2662,2807,2809],{"id":2808},"patchvnode复用节点的三类情况","patchVnode：复用节点的三类情况",[1531,2811,2812,2813,2815,2816,2818],{},"能进 ",[1561,2814,2801],{},"，说明新旧节点\"是同一个人\"，真实元素（",[1561,2817,1750],{},"）直接复用，要处理的只是它的内容。简化后的分支：",[1592,2820,2822],{"className":1594,"code":2821,"language":1596,"meta":1597,"style":1597},"// 简化自 src/core/vdom/patch.js\nfunction patchVnode(oldVnode, vnode) {\n    const elm = (vnode.elm = oldVnode.elm) // 复用真实元素\n    const oldCh = oldVnode.children\n    const ch = vnode.children\n\n    if (isDef(vnode.text)) {\n        // 情况一：新节点是文本，直接覆盖\n        elm.textContent = vnode.text\n    } else if (isDef(oldCh) && isDef(ch)) {\n        // 情况二：新旧都有子节点，进入双端 Diff\n        updateChildren(elm, oldCh, ch)\n    } else if (isDef(ch)) {\n        // 情况三：只有新节点有子节点，先清空旧文本再批量插入\n        elm.textContent = ''\n        addVnodes(elm, null, ch, 0, ch.length - 1)\n    } else if (isDef(oldCh)) {\n        // 新节点没有内容，删掉所有旧子节点\n        removeVnodes(oldCh, 0, oldCh.length - 1)\n    }\n}\n",[1561,2823,2824,2828,2847,2876,2892,2907,2911,2932,2937,2956,2990,2995,3014,3034,3039,3052,3089,3109,3114,3141,3145],{"__ignoreMap":1597},[1601,2825,2826],{"class":1603,"line":1604},[1601,2827,2409],{"class":1607},[1601,2829,2830,2832,2835,2837,2839,2841,2843,2845],{"class":1603,"line":1611},[1601,2831,2414],{"class":1621},[1601,2833,2834],{"class":2071}," patchVnode",[1601,2836,1639],{"class":1629},[1601,2838,2398],{"class":1642},[1601,2840,1646],{"class":1629},[1601,2842,2127],{"class":1642},[1601,2844,1677],{"class":1629},[1601,2846,1630],{"class":1629},[1601,2848,2849,2851,2853,2855,2857,2859,2861,2863,2865,2867,2869,2871,2873],{"class":1603,"line":1633},[1601,2850,2087],{"class":1621},[1601,2852,1664],{"class":1688},[1601,2854,1691],{"class":1629},[1601,2856,2196],{"class":1817},[1601,2858,2199],{"class":1688},[1601,2860,2063],{"class":1629},[1601,2862,1750],{"class":1688},[1601,2864,1691],{"class":1629},[1601,2866,2541],{"class":1688},[1601,2868,2063],{"class":1629},[1601,2870,1750],{"class":1688},[1601,2872,2261],{"class":1817},[1601,2874,2875],{"class":1607},"// 复用真实元素\n",[1601,2877,2878,2880,2883,2885,2887,2889],{"class":1603,"line":1682},[1601,2879,2087],{"class":1621},[1601,2881,2882],{"class":1688}," oldCh",[1601,2884,1691],{"class":1629},[1601,2886,2541],{"class":1688},[1601,2888,2063],{"class":1629},[1601,2890,2891],{"class":1688},"children\n",[1601,2893,2894,2896,2899,2901,2903,2905],{"class":1603,"line":1700},[1601,2895,2087],{"class":1621},[1601,2897,2898],{"class":1688}," ch",[1601,2900,1691],{"class":1629},[1601,2902,2127],{"class":1688},[1601,2904,2063],{"class":1629},[1601,2906,2891],{"class":1688},[1601,2908,2909],{"class":1603,"line":1715},[1601,2910,2171],{"emptyLinePlaceholder":2170},[1601,2912,2913,2915,2917,2920,2922,2924,2926,2928,2930],{"class":1603,"line":1730},[1601,2914,2250],{"class":1614},[1601,2916,2196],{"class":1817},[1601,2918,2919],{"class":2071},"isDef",[1601,2921,1639],{"class":1817},[1601,2923,2199],{"class":1688},[1601,2925,2063],{"class":1629},[1601,2927,1735],{"class":1688},[1601,2929,2493],{"class":1817},[1601,2931,1877],{"class":1629},[1601,2933,2934],{"class":1603,"line":1745},[1601,2935,2936],{"class":1607},"        // 情况一：新节点是文本，直接覆盖\n",[1601,2938,2939,2942,2944,2947,2949,2951,2953],{"class":1603,"line":1760},[1601,2940,2941],{"class":1688},"        elm",[1601,2943,2063],{"class":1629},[1601,2945,2946],{"class":1688},"textContent",[1601,2948,1691],{"class":1629},[1601,2950,2127],{"class":1688},[1601,2952,2063],{"class":1629},[1601,2954,2955],{"class":1688},"text\n",[1601,2957,2958,2960,2962,2965,2967,2969,2971,2974,2976,2979,2981,2983,2986,2988],{"class":1603,"line":1775},[1601,2959,2309],{"class":1629},[1601,2961,2312],{"class":1614},[1601,2963,2964],{"class":1614}," if",[1601,2966,2196],{"class":1817},[1601,2968,2919],{"class":2071},[1601,2970,1639],{"class":1817},[1601,2972,2973],{"class":1688},"oldCh",[1601,2975,2261],{"class":1817},[1601,2977,2978],{"class":1629},"&&",[1601,2980,2766],{"class":2071},[1601,2982,1639],{"class":1817},[1601,2984,2985],{"class":1688},"ch",[1601,2987,2493],{"class":1817},[1601,2989,1877],{"class":1629},[1601,2991,2992],{"class":1603,"line":1790},[1601,2993,2994],{"class":1607},"        // 情况二：新旧都有子节点，进入双端 Diff\n",[1601,2996,2997,3000,3002,3004,3006,3008,3010,3012],{"class":1603,"line":1796},[1601,2998,2999],{"class":2071},"        updateChildren",[1601,3001,1639],{"class":1817},[1601,3003,1750],{"class":1688},[1601,3005,1646],{"class":1629},[1601,3007,2882],{"class":1688},[1601,3009,1646],{"class":1629},[1601,3011,2898],{"class":1688},[1601,3013,2153],{"class":1817},[1601,3015,3016,3018,3020,3022,3024,3026,3028,3030,3032],{"class":1603,"line":2013},[1601,3017,2309],{"class":1629},[1601,3019,2312],{"class":1614},[1601,3021,2964],{"class":1614},[1601,3023,2196],{"class":1817},[1601,3025,2919],{"class":2071},[1601,3027,1639],{"class":1817},[1601,3029,2985],{"class":1688},[1601,3031,2493],{"class":1817},[1601,3033,1877],{"class":1629},[1601,3035,3036],{"class":1603,"line":2232},[1601,3037,3038],{"class":1607},"        // 情况三：只有新节点有子节点，先清空旧文本再批量插入\n",[1601,3040,3041,3043,3045,3047,3049],{"class":1603,"line":2247},[1601,3042,2941],{"class":1688},[1601,3044,2063],{"class":1629},[1601,3046,2946],{"class":1688},[1601,3048,1691],{"class":1629},[1601,3050,3051],{"class":1629}," ''\n",[1601,3053,3054,3057,3059,3061,3063,3066,3068,3070,3072,3074,3076,3078,3081,3084,3087],{"class":1603,"line":2266},[1601,3055,3056],{"class":2071},"        addVnodes",[1601,3058,1639],{"class":1817},[1601,3060,1750],{"class":1688},[1601,3062,1646],{"class":1629},[1601,3064,3065],{"class":1629}," null,",[1601,3067,2898],{"class":1688},[1601,3069,1646],{"class":1629},[1601,3071,2600],{"class":2599},[1601,3073,1646],{"class":1629},[1601,3075,2898],{"class":1688},[1601,3077,2063],{"class":1629},[1601,3079,3080],{"class":1688},"length",[1601,3082,3083],{"class":1629}," -",[1601,3085,3086],{"class":2599}," 1",[1601,3088,2153],{"class":1817},[1601,3090,3091,3093,3095,3097,3099,3101,3103,3105,3107],{"class":1603,"line":2272},[1601,3092,2309],{"class":1629},[1601,3094,2312],{"class":1614},[1601,3096,2964],{"class":1614},[1601,3098,2196],{"class":1817},[1601,3100,2919],{"class":2071},[1601,3102,1639],{"class":1817},[1601,3104,2973],{"class":1688},[1601,3106,2493],{"class":1817},[1601,3108,1877],{"class":1629},[1601,3110,3111],{"class":1603,"line":2306},[1601,3112,3113],{"class":1607},"        // 新节点没有内容，删掉所有旧子节点\n",[1601,3115,3116,3119,3121,3123,3125,3127,3129,3131,3133,3135,3137,3139],{"class":1603,"line":2317},[1601,3117,3118],{"class":2071},"        removeVnodes",[1601,3120,1639],{"class":1817},[1601,3122,2973],{"class":1688},[1601,3124,1646],{"class":1629},[1601,3126,2600],{"class":2599},[1601,3128,1646],{"class":1629},[1601,3130,2882],{"class":1688},[1601,3132,2063],{"class":1629},[1601,3134,3080],{"class":1688},[1601,3136,3083],{"class":1629},[1601,3138,3086],{"class":2599},[1601,3140,2153],{"class":1817},[1601,3142,3143],{"class":1603,"line":2323},[1601,3144,1793],{"class":1629},[1601,3146,3147],{"class":1603,"line":2350},[1601,3148,1799],{"class":1629},[1531,3150,3151,3152,3159],{},"这和 Snabbdom 课程里讲的更新规则完全一致：",[1535,3153,3154,3155,3158],{},"文本直接覆盖、都有 children 走 ",[1561,3156,3157],{},"updateChildren","、一方有子节点则增删","。Vue2 只是多处理了组件节点等场景，思想没有变化。",[1543,3161],{},[1526,3163,3165],{"id":3164},"updatechildren双端-diff-的四次比较","🧠 updateChildren：双端 Diff 的四次比较",[1531,3167,3168,3169,3171,3172,3174],{},"当新旧节点都有 ",[1561,3170,1720],{}," 时，进入 ",[1561,3173,3157],{},"。Vue2 沿用了 Snabbdom 的双端指针策略：在旧、新两个子数组上各放头、尾两个指针，每一轮按固定顺序做四次比较。",[1531,3176,3177],{},"比较顺序和处理方式：",[3179,3180,3181,3200],"table",{},[3182,3183,3184],"thead",{},[3185,3186,3187,3191,3194,3197],"tr",{},[3188,3189,3190],"th",{},"顺序",[3188,3192,3193],{},"比较",[3188,3195,3196],{},"命中说明",[3188,3198,3199],{},"处理方式",[3201,3202,3203,3220,3236,3250],"tbody",{},[3185,3204,3205,3209,3212,3215],{},[3206,3207,3208],"td",{},"①",[3206,3210,3211],{},"旧头 vs 新头",[3206,3213,3214],{},"开头没变",[3206,3216,3217,3219],{},[1561,3218,2801],{}," 更新内容，两个头指针后移",[3185,3221,3222,3225,3228,3231],{},[3206,3223,3224],{},"②",[3206,3226,3227],{},"旧尾 vs 新尾",[3206,3229,3230],{},"结尾没变",[3206,3232,3233,3235],{},[1561,3234,2801],{}," 更新内容，两个尾指针前移",[3185,3237,3238,3241,3244,3247],{},[3206,3239,3240],{},"③",[3206,3242,3243],{},"旧头 vs 新尾",[3206,3245,3246],{},"旧的开头被移到了最后",[3206,3248,3249],{},"更新内容，把旧头的真实元素移到末尾",[3185,3251,3252,3255,3258,3261],{},[3206,3253,3254],{},"④",[3206,3256,3257],{},"旧尾 vs 新头",[3206,3259,3260],{},"旧的结尾被移到了最前",[3206,3262,3263],{},"更新内容，把旧尾的真实元素移到开头",[1531,3265,3266,3267,3269,3270,3272],{},"简化的伪代码如下（真实源码在 ",[1561,3268,2394],{}," 的 ",[1561,3271,3157],{},"，多了 key 映射表等分支，这里只保留主干）：",[1592,3274,3276],{"className":1594,"code":3275,"language":1596,"meta":1597,"style":1597},"// 简化自 src/core/vdom/patch.js 的 updateChildren\nfunction updateChildren(parentElm, oldCh, newCh) {\n    let oldStartIdx = 0, oldEndIdx = oldCh.length - 1\n    let newStartIdx = 0, newEndIdx = newCh.length - 1\n\n    while (oldStartIdx \u003C= oldEndIdx && newStartIdx \u003C= newEndIdx) {\n        if (sameVnode(oldCh[oldStartIdx], newCh[newStartIdx])) {\n            // ① 旧头 vs 新头\n            patchVnode(oldCh[oldStartIdx], newCh[newStartIdx])\n            oldStartIdx++; newStartIdx++\n        } else if (sameVnode(oldCh[oldEndIdx], newCh[newEndIdx])) {\n            // ② 旧尾 vs 新尾\n            patchVnode(oldCh[oldEndIdx], newCh[newEndIdx])\n            oldEndIdx--; newEndIdx--\n        } else if (sameVnode(oldCh[oldStartIdx], newCh[newEndIdx])) {\n            // ③ 旧头 vs 新尾：旧头被移到了最后\n            patchVnode(oldCh[oldStartIdx], newCh[newEndIdx])\n            parentElm.insertBefore(oldCh[oldStartIdx].elm, null) // 移到末尾\n            oldStartIdx++; newEndIdx--\n        } else if (sameVnode(oldCh[oldEndIdx], newCh[newStartIdx])) {\n            // ④ 旧尾 vs 新头：旧尾被移到了最前\n            patchVnode(oldCh[oldEndIdx], newCh[newStartIdx])\n            parentElm.insertBefore(oldCh[oldEndIdx].elm, oldCh[oldStartIdx].elm)\n            oldEndIdx--; newStartIdx++\n        } else {\n            // 四次都不命中：用旧子节点的 key 建映射表查找\n            // 找得到就复用并移动，找不到就新建\n        }\n    }\n    // 循环结束后：旧数组有剩余则删除，新数组有剩余则插入\n}\n",[1561,3277,3278,3283,3308,3338,3366,3370,3398,3431,3436,3461,3474,3510,3515,3539,3552,3586,3591,3615,3649,3659,3693,3698,3722,3761,3772,3781,3787,3793,3798,3803,3809],{"__ignoreMap":1597},[1601,3279,3280],{"class":1603,"line":1604},[1601,3281,3282],{"class":1607},"// 简化自 src/core/vdom/patch.js 的 updateChildren\n",[1601,3284,3285,3287,3290,3292,3295,3297,3299,3301,3304,3306],{"class":1603,"line":1611},[1601,3286,2414],{"class":1621},[1601,3288,3289],{"class":2071}," updateChildren",[1601,3291,1639],{"class":1629},[1601,3293,3294],{"class":1642},"parentElm",[1601,3296,1646],{"class":1629},[1601,3298,2882],{"class":1642},[1601,3300,1646],{"class":1629},[1601,3302,3303],{"class":1642}," newCh",[1601,3305,1677],{"class":1629},[1601,3307,1630],{"class":1629},[1601,3309,3310,3313,3316,3318,3320,3322,3325,3327,3329,3331,3333,3335],{"class":1603,"line":1633},[1601,3311,3312],{"class":1621},"    let",[1601,3314,3315],{"class":1688}," oldStartIdx",[1601,3317,1691],{"class":1629},[1601,3319,2600],{"class":2599},[1601,3321,1646],{"class":1629},[1601,3323,3324],{"class":1688}," oldEndIdx",[1601,3326,1691],{"class":1629},[1601,3328,2882],{"class":1688},[1601,3330,2063],{"class":1629},[1601,3332,3080],{"class":1688},[1601,3334,3083],{"class":1629},[1601,3336,3337],{"class":2599}," 1\n",[1601,3339,3340,3342,3345,3347,3349,3351,3354,3356,3358,3360,3362,3364],{"class":1603,"line":1682},[1601,3341,3312],{"class":1621},[1601,3343,3344],{"class":1688}," newStartIdx",[1601,3346,1691],{"class":1629},[1601,3348,2600],{"class":2599},[1601,3350,1646],{"class":1629},[1601,3352,3353],{"class":1688}," newEndIdx",[1601,3355,1691],{"class":1629},[1601,3357,3303],{"class":1688},[1601,3359,2063],{"class":1629},[1601,3361,3080],{"class":1688},[1601,3363,3083],{"class":1629},[1601,3365,3337],{"class":2599},[1601,3367,3368],{"class":1603,"line":1700},[1601,3369,2171],{"emptyLinePlaceholder":2170},[1601,3371,3372,3375,3377,3380,3383,3385,3388,3390,3392,3394,3396],{"class":1603,"line":1715},[1601,3373,3374],{"class":1614},"    while",[1601,3376,2196],{"class":1817},[1601,3378,3379],{"class":1688},"oldStartIdx",[1601,3381,3382],{"class":1629}," \u003C=",[1601,3384,3324],{"class":1688},[1601,3386,3387],{"class":1629}," &&",[1601,3389,3344],{"class":1688},[1601,3391,3382],{"class":1629},[1601,3393,3353],{"class":1688},[1601,3395,2261],{"class":1817},[1601,3397,1877],{"class":1629},[1601,3399,3400,3402,3404,3406,3408,3410,3413,3415,3417,3419,3421,3423,3426,3429],{"class":1603,"line":1730},[1601,3401,2477],{"class":1614},[1601,3403,2196],{"class":1817},[1601,3405,2482],{"class":2071},[1601,3407,1639],{"class":1817},[1601,3409,2973],{"class":1688},[1601,3411,3412],{"class":1817},"[",[1601,3414,3379],{"class":1688},[1601,3416,2594],{"class":1817},[1601,3418,1646],{"class":1629},[1601,3420,3303],{"class":1688},[1601,3422,3412],{"class":1817},[1601,3424,3425],{"class":1688},"newStartIdx",[1601,3427,3428],{"class":1817},"])) ",[1601,3430,1877],{"class":1629},[1601,3432,3433],{"class":1603,"line":1745},[1601,3434,3435],{"class":1607},"            // ① 旧头 vs 新头\n",[1601,3437,3438,3440,3442,3444,3446,3448,3450,3452,3454,3456,3458],{"class":1603,"line":1760},[1601,3439,2505],{"class":2071},[1601,3441,1639],{"class":1817},[1601,3443,2973],{"class":1688},[1601,3445,3412],{"class":1817},[1601,3447,3379],{"class":1688},[1601,3449,2594],{"class":1817},[1601,3451,1646],{"class":1629},[1601,3453,3303],{"class":1688},[1601,3455,3412],{"class":1817},[1601,3457,3425],{"class":1688},[1601,3459,3460],{"class":1817},"])\n",[1601,3462,3463,3466,3469,3471],{"class":1603,"line":1775},[1601,3464,3465],{"class":1688},"            oldStartIdx",[1601,3467,3468],{"class":1629},"++;",[1601,3470,3344],{"class":1688},[1601,3472,3473],{"class":1629},"++\n",[1601,3475,3476,3478,3480,3482,3484,3486,3488,3490,3492,3495,3497,3499,3501,3503,3506,3508],{"class":1603,"line":1790},[1601,3477,2520],{"class":1629},[1601,3479,2312],{"class":1614},[1601,3481,2964],{"class":1614},[1601,3483,2196],{"class":1817},[1601,3485,2482],{"class":2071},[1601,3487,1639],{"class":1817},[1601,3489,2973],{"class":1688},[1601,3491,3412],{"class":1817},[1601,3493,3494],{"class":1688},"oldEndIdx",[1601,3496,2594],{"class":1817},[1601,3498,1646],{"class":1629},[1601,3500,3303],{"class":1688},[1601,3502,3412],{"class":1817},[1601,3504,3505],{"class":1688},"newEndIdx",[1601,3507,3428],{"class":1817},[1601,3509,1877],{"class":1629},[1601,3511,3512],{"class":1603,"line":1796},[1601,3513,3514],{"class":1607},"            // ② 旧尾 vs 新尾\n",[1601,3516,3517,3519,3521,3523,3525,3527,3529,3531,3533,3535,3537],{"class":1603,"line":2013},[1601,3518,2505],{"class":2071},[1601,3520,1639],{"class":1817},[1601,3522,2973],{"class":1688},[1601,3524,3412],{"class":1817},[1601,3526,3494],{"class":1688},[1601,3528,2594],{"class":1817},[1601,3530,1646],{"class":1629},[1601,3532,3303],{"class":1688},[1601,3534,3412],{"class":1817},[1601,3536,3505],{"class":1688},[1601,3538,3460],{"class":1817},[1601,3540,3541,3544,3547,3549],{"class":1603,"line":2232},[1601,3542,3543],{"class":1688},"            oldEndIdx",[1601,3545,3546],{"class":1629},"--;",[1601,3548,3353],{"class":1688},[1601,3550,3551],{"class":1629},"--\n",[1601,3553,3554,3556,3558,3560,3562,3564,3566,3568,3570,3572,3574,3576,3578,3580,3582,3584],{"class":1603,"line":2247},[1601,3555,2520],{"class":1629},[1601,3557,2312],{"class":1614},[1601,3559,2964],{"class":1614},[1601,3561,2196],{"class":1817},[1601,3563,2482],{"class":2071},[1601,3565,1639],{"class":1817},[1601,3567,2973],{"class":1688},[1601,3569,3412],{"class":1817},[1601,3571,3379],{"class":1688},[1601,3573,2594],{"class":1817},[1601,3575,1646],{"class":1629},[1601,3577,3303],{"class":1688},[1601,3579,3412],{"class":1817},[1601,3581,3505],{"class":1688},[1601,3583,3428],{"class":1817},[1601,3585,1877],{"class":1629},[1601,3587,3588],{"class":1603,"line":2266},[1601,3589,3590],{"class":1607},"            // ③ 旧头 vs 新尾：旧头被移到了最后\n",[1601,3592,3593,3595,3597,3599,3601,3603,3605,3607,3609,3611,3613],{"class":1603,"line":2272},[1601,3594,2505],{"class":2071},[1601,3596,1639],{"class":1817},[1601,3598,2973],{"class":1688},[1601,3600,3412],{"class":1817},[1601,3602,3379],{"class":1688},[1601,3604,2594],{"class":1817},[1601,3606,1646],{"class":1629},[1601,3608,3303],{"class":1688},[1601,3610,3412],{"class":1817},[1601,3612,3505],{"class":1688},[1601,3614,3460],{"class":1817},[1601,3616,3617,3620,3622,3625,3627,3629,3631,3633,3635,3637,3639,3641,3644,3646],{"class":1603,"line":2306},[1601,3618,3619],{"class":1688},"            parentElm",[1601,3621,2063],{"class":1629},[1601,3623,3624],{"class":2071},"insertBefore",[1601,3626,1639],{"class":1817},[1601,3628,2973],{"class":1688},[1601,3630,3412],{"class":1817},[1601,3632,3379],{"class":1688},[1601,3634,2594],{"class":1817},[1601,3636,2063],{"class":1629},[1601,3638,1750],{"class":1688},[1601,3640,1646],{"class":1629},[1601,3642,3643],{"class":1629}," null",[1601,3645,2261],{"class":1817},[1601,3647,3648],{"class":1607},"// 移到末尾\n",[1601,3650,3651,3653,3655,3657],{"class":1603,"line":2317},[1601,3652,3465],{"class":1688},[1601,3654,3468],{"class":1629},[1601,3656,3353],{"class":1688},[1601,3658,3551],{"class":1629},[1601,3660,3661,3663,3665,3667,3669,3671,3673,3675,3677,3679,3681,3683,3685,3687,3689,3691],{"class":1603,"line":2323},[1601,3662,2520],{"class":1629},[1601,3664,2312],{"class":1614},[1601,3666,2964],{"class":1614},[1601,3668,2196],{"class":1817},[1601,3670,2482],{"class":2071},[1601,3672,1639],{"class":1817},[1601,3674,2973],{"class":1688},[1601,3676,3412],{"class":1817},[1601,3678,3494],{"class":1688},[1601,3680,2594],{"class":1817},[1601,3682,1646],{"class":1629},[1601,3684,3303],{"class":1688},[1601,3686,3412],{"class":1817},[1601,3688,3425],{"class":1688},[1601,3690,3428],{"class":1817},[1601,3692,1877],{"class":1629},[1601,3694,3695],{"class":1603,"line":2350},[1601,3696,3697],{"class":1607},"            // ④ 旧尾 vs 新头：旧尾被移到了最前\n",[1601,3699,3700,3702,3704,3706,3708,3710,3712,3714,3716,3718,3720],{"class":1603,"line":2355},[1601,3701,2505],{"class":2071},[1601,3703,1639],{"class":1817},[1601,3705,2973],{"class":1688},[1601,3707,3412],{"class":1817},[1601,3709,3494],{"class":1688},[1601,3711,2594],{"class":1817},[1601,3713,1646],{"class":1629},[1601,3715,3303],{"class":1688},[1601,3717,3412],{"class":1817},[1601,3719,3425],{"class":1688},[1601,3721,3460],{"class":1817},[1601,3723,3725,3727,3729,3731,3733,3735,3737,3739,3741,3743,3745,3747,3749,3751,3753,3755,3757,3759],{"class":1603,"line":3724},23,[1601,3726,3619],{"class":1688},[1601,3728,2063],{"class":1629},[1601,3730,3624],{"class":2071},[1601,3732,1639],{"class":1817},[1601,3734,2973],{"class":1688},[1601,3736,3412],{"class":1817},[1601,3738,3494],{"class":1688},[1601,3740,2594],{"class":1817},[1601,3742,2063],{"class":1629},[1601,3744,1750],{"class":1688},[1601,3746,1646],{"class":1629},[1601,3748,2882],{"class":1688},[1601,3750,3412],{"class":1817},[1601,3752,3379],{"class":1688},[1601,3754,2594],{"class":1817},[1601,3756,2063],{"class":1629},[1601,3758,1750],{"class":1688},[1601,3760,2153],{"class":1817},[1601,3762,3764,3766,3768,3770],{"class":1603,"line":3763},24,[1601,3765,3543],{"class":1688},[1601,3767,3546],{"class":1629},[1601,3769,3344],{"class":1688},[1601,3771,3473],{"class":1629},[1601,3773,3775,3777,3779],{"class":1603,"line":3774},25,[1601,3776,2520],{"class":1629},[1601,3778,2312],{"class":1614},[1601,3780,1630],{"class":1629},[1601,3782,3784],{"class":1603,"line":3783},26,[1601,3785,3786],{"class":1607},"            // 四次都不命中：用旧子节点的 key 建映射表查找\n",[1601,3788,3790],{"class":1603,"line":3789},27,[1601,3791,3792],{"class":1607},"            // 找得到就复用并移动，找不到就新建\n",[1601,3794,3796],{"class":1603,"line":3795},28,[1601,3797,2005],{"class":1629},[1601,3799,3801],{"class":1603,"line":3800},29,[1601,3802,1793],{"class":1629},[1601,3804,3806],{"class":1603,"line":3805},30,[1601,3807,3808],{"class":1607},"    // 循环结束后：旧数组有剩余则删除，新数组有剩余则插入\n",[1601,3810,3812],{"class":1603,"line":3811},31,[1601,3813,1799],{"class":1629},[1531,3815,3816,3817,3820],{},"记忆这个流程有个小技巧：",[1535,3818,3819],{},"先两端、再交叉","。①② 处理\"原地不动\"的常见情况，③④ 处理\"整体翻转/搬运\"的情况，都不命中才动用 key 映射表兜底。每一步都是 O(1)，整体复杂度 O(n)。",[3822,3823,3824],"tip",{},[1531,3825,3826,3827,3830],{},"四次比较的顺序不需要背，理解\"为什么是这个顺序\"更重要：Vue 假设列表更新时",[1535,3828,3829],{},"头尾不变的情况更常见","（如追加、删除中间项），所以优先比较头头、尾尾，命中率高、移动少。",[1543,3832],{},[1526,3834,3836],{"id":3835},"key-的作用回顾","🔑 key 的作用回顾",[1531,3838,3839,3840,3843,3844,3846],{},"到这里 key 的意义就水落石出了：",[1535,3841,3842],{},"key 是节点的\"身份证\"","，它和 tag 一起决定 ",[1561,3845,2482],{}," 的判断结果，也就决定了节点能否被复用。列表渲染时给每项一个稳定且唯一的 key，能让 Diff 一直走\"复用 + 移动\"的高效路径，而不是按位置就地复用、改写内容。",[1543,3848],{},[1526,3850,3852],{"id":3851},"小节总结","🧾 小节总结",[2630,3854,3855,3870,3880,3892,3900,3908],{},[2633,3856,3857,3858,1564,3860,1564,3862,1564,3864,1564,3866,1564,3868,1538],{},"VNode 是用 JS 对象描述 DOM 的结构，核心字段有 ",[1561,3859,1643],{},[1561,3861,1705],{},[1561,3863,1720],{},[1561,3865,1735],{},[1561,3867,1750],{},[1561,3869,1765],{},[2633,3871,3872,3874,3875,2370,3877,3879],{},[1561,3873,2365],{}," 执行 render 函数生成 VNode 树，",[1561,3876,2369],{},[1561,3878,2289],{}," 把它变成真实 DOM。",[2633,3881,3882,3883,3885,3886,3888,3889,3891],{},"patch 分两条路径：",[1561,3884,2398],{}," 为空时直接 ",[1561,3887,2644],{}," 整棵创建，否则先过 ",[1561,3890,2482],{}," 判断。",[2633,3893,3894,3896,3897,3899],{},[1561,3895,2482],{}," 要求 key 和 tag 相同：相同走 ",[1561,3898,2801],{}," 复用更新，不同则销毁重建。",[2633,3901,3902,3904,3905,3907],{},[1561,3903,2801],{}," 按内容分三类：新节点是文本直接覆盖、双方都有 children 走 ",[1561,3906,3157],{},"、一方有子节点则增删。",[2633,3909,3910,3912],{},[1561,3911,3157],{}," 采用双端指针：旧前新前、旧后新后、旧前新后、旧后新前四次比较，不命中再用 key 映射表兜底。",[1543,3914],{},[1526,3916,3918],{"id":3917},"知识问答","❓ 知识问答",[1531,3920,3921],{},[1535,3922,3923],{},"Q1：首次渲染也需要 patch 吗？",[1531,3925,3926,3927,3929,3930,3932],{},"A：需要。首次渲染时 ",[1561,3928,2398],{}," 是空的（或挂载点元素），patch 走 ",[1561,3931,2644],{}," 路径，直接按 VNode 树创建整棵 DOM，不涉及对比。",[1531,3934,3935],{},[1535,3936,3937],{},"Q2：sameVnode 相同就一定复用吗？",[1531,3939,3940,3941,3943,3944,3946],{},"A：是的，进入 ",[1561,3942,2801],{}," 后真实元素（",[1561,3945,1750],{},"）直接被新 VNode 继承，后续只更新属性和内容，元素本身不重建。",[1531,3948,3949],{},[1535,3950,3951],{},"Q3：双端比较四次都不命中时怎么办？",[1531,3953,3954],{},"A：用旧子节点的 key 建一个映射表，拿新头节点的 key 去查：查得到就复用那个旧节点并把它的真实元素移到正确位置，查不到就为它新建一个元素。",[1531,3956,3957],{},[1535,3958,3959],{},"Q4：为什么 updateChildren 不直接用双重循环一一对比？",[1531,3961,3962],{},"A：双重循环是 O(n²)，双端指针把常见更新（头尾不变、整体移动）都收敛成了 O(1) 的指针移动，整体只需 O(n)，且减少了真实 DOM 的移动次数。",[1543,3964],{},[1526,3966,3968],{"id":3967},"小练习","🧪 小练习",[1531,3970,3971,3972,3975,3976,3979,3980,3982,3983,1564,3985,1564,3987,3990],{},"假设页面列表从 ",[1561,3973,3974],{},"[A, B, C]"," 更新为 ",[1561,3977,3978],{},"[C, A, B]","（三个 ",[1561,3981,2633],{}," 的 key 分别为 ",[1561,3984,1556],{},[1561,3986,2771],{},[1561,3988,3989],{},"c","），不写代码，用注释推演双端比较的完整过程：每一轮命中哪次比较、指针怎么移动、做了什么 DOM 操作。",[1592,3992,3994],{"className":1594,"code":3993,"language":1596,"meta":1597,"style":1597},"// 旧子节点: [A(key:a), B(key:b), C(key:c)]\n// 新子节点: [C(key:c), A(key:a), B(key:b)]\n//\n// 第 1 轮：命中第 ___ 次比较（提示：先比旧头 vs 新头，再比旧尾 vs 新尾）\n// 请在这里编写代码（用文字描述本轮的比较结果和指针移动）\n//\n// 第 2 轮：\n// 请在这里编写代码\n//\n// 最终 DOM 操作统计：\n// 请在这里编写代码（共移动了几次真实元素？有没有新建或删除？）\n",[1561,3995,3996,4001,4006,4011,4016,4021,4025,4030,4035,4039,4044],{"__ignoreMap":1597},[1601,3997,3998],{"class":1603,"line":1604},[1601,3999,4000],{"class":1607},"// 旧子节点: [A(key:a), B(key:b), C(key:c)]\n",[1601,4002,4003],{"class":1603,"line":1611},[1601,4004,4005],{"class":1607},"// 新子节点: [C(key:c), A(key:a), B(key:b)]\n",[1601,4007,4008],{"class":1603,"line":1633},[1601,4009,4010],{"class":1607},"//\n",[1601,4012,4013],{"class":1603,"line":1682},[1601,4014,4015],{"class":1607},"// 第 1 轮：命中第 ___ 次比较（提示：先比旧头 vs 新头，再比旧尾 vs 新尾）\n",[1601,4017,4018],{"class":1603,"line":1700},[1601,4019,4020],{"class":1607},"// 请在这里编写代码（用文字描述本轮的比较结果和指针移动）\n",[1601,4022,4023],{"class":1603,"line":1715},[1601,4024,4010],{"class":1607},[1601,4026,4027],{"class":1603,"line":1730},[1601,4028,4029],{"class":1607},"// 第 2 轮：\n",[1601,4031,4032],{"class":1603,"line":1745},[1601,4033,4034],{"class":1607},"// 请在这里编写代码\n",[1601,4036,4037],{"class":1603,"line":1760},[1601,4038,4010],{"class":1607},[1601,4040,4041],{"class":1603,"line":1775},[1601,4042,4043],{"class":1607},"// 最终 DOM 操作统计：\n",[1601,4045,4046],{"class":1603,"line":1790},[1601,4047,4048],{"class":1607},"// 请在这里编写代码（共移动了几次真实元素？有没有新建或删除？）\n",[1543,4050],{},[1531,4052,4053],{},"🎉 恭喜你已经掌握 Vue2 虚拟 DOM 与 patch 的核心流程啦！VNode 负责描述、patch 负责落地、双端 Diff 负责高效更新，这条链路就是 Vue2 渲染机制的主干。",[4055,4056,4057],"style",{},"html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sK9QF, html code.shiki .sK9QF{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}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 .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":1597,"searchDepth":1611,"depth":1611,"links":4059},[4060,4061,4062,4063,4064,4065,4069,4070,4071,4072,4073],{"id":1528,"depth":1611,"text":1529},{"id":1547,"depth":1611,"text":1548},{"id":1579,"depth":1611,"text":1580},{"id":2033,"depth":1611,"text":2034},{"id":2385,"depth":1611,"text":2386},{"id":2659,"depth":1611,"text":2660,"children":4066},[4067,4068],{"id":2664,"depth":1633,"text":2665},{"id":2808,"depth":1633,"text":2809},{"id":3164,"depth":1611,"text":3165},{"id":3835,"depth":1611,"text":3836},{"id":3851,"depth":1611,"text":3852},{"id":3917,"depth":1611,"text":3918},{"id":3967,"depth":1611,"text":3968},"理解 VNode 的结构与 patch 的更新流程，掌握 Vue2 双端 Diff 的核心思路。","md",null,{},{"title":1407},{"title":1521,"description":4074},"We2SkrmpPw",[4082,4084],{"title":1403,"path":1404,"stem":1405,"description":4083,"children":-1},"理解 Vue2 为什么异步更新 DOM，掌握 watcher 队列去重与 nextTick 的实现原理。",{"title":1411,"path":1412,"stem":1413,"description":4085,"children":-1},"掌握模板编译 parse、optimize、generate 三个阶段，理解模板到 render 函数的完整转换过程。",1784715111907]