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引言",[1531,1532,1533,1534,1538,1539,1542,1543],"p",{},"前几篇我们讲清楚了「数据变了会触发更新」这条链路：",[1535,1536,1537],"code",{},"reactive"," 拦截读写，",[1535,1540,1541],{},"effect"," 收集依赖，调度器把更新任务排队后异步执行。但还差一环：",[1544,1545,1546],"strong",{},"更新真正发生时，组件的 vnode 是怎么一步一步变成真实 DOM 的？",[1531,1548,1549],{},"这一篇就来补上这一环。学完之后，你能够：",[1551,1552,1553,1557,1568,1571],"ul",{},[1554,1555,1556],"li",{},"说清楚 VNode 是什么，它和真实 DOM 是什么关系。",[1554,1558,1559,1560,1563,1564,1567],{},"理解 ",[1535,1561,1562],{},"render"," 与 ",[1535,1565,1566],{},"patch"," 的主干流程：没有旧 vnode 走挂载，有旧 vnode 走更新。",[1554,1569,1570],{},"知道 patch 如何按节点类型分流处理，元素节点又如何对比 props 和 children。",[1554,1572,1573],{},"理解 Vue3 的编译优化思路：用 PatchFlag 标记动态内容，用 Block 收集动态节点，更新时跳过所有静态内容。",[1531,1575,1576,1577,1580,1581,1584,1585,1588,1589,1592],{},"本篇源码基于 ",[1544,1578,1579],{},"Vue 3.5.x","（GitHub vuejs/core 仓库），主要涉及 ",[1535,1582,1583],{},"packages/runtime-core/src/vnode.ts"," 和 ",[1535,1586,1587],{},"packages/runtime-core/src/renderer.ts","。示例代码可以直接用 ",[1544,1590,1591],{},"Node.js v22"," 运行。",[1594,1595],"hr",{},[1526,1597,1599],{"id":1598},"vnode-是什么","🧱 VNode 是什么",[1531,1601,1602],{},"这一节先解决一个疑问：浏览器只认真实 DOM，Vue 为什么要在中间多搞一层「虚拟 DOM」？",[1531,1604,1605,1608,1609,1612],{},[1544,1606,1607],{},"VNode（虚拟节点）就是一个普通的 JavaScript 对象，用来描述界面上一个节点长什么样。","「虚拟」的意思是：它只存在于 JS 里，浏览器看不到它。可以把它理解成真实 DOM 的一张「图纸」：上面写清了节点的类型、属性和内容，Vue 照着它创建和更新真实 DOM，所以它是真实 DOM 的",[1544,1610,1611],{},"轻量替身","。",[1531,1614,1615,1616,1619,1620,1622],{},"创建 VNode 用的是 ",[1535,1617,1618],{},"h"," 函数（模板也会被编译成对 ",[1535,1621,1618],{}," 的调用）。它的核心字段很少，我们从源码里提炼出来看：",[1624,1625,1630],"pre",{"className":1626,"code":1627,"language":1628,"meta":1629,"style":1629},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","// 简化自 packages/runtime-core/src/vnode.ts\nfunction createVNode(type, props = null, children = null) {\n    const vnode = {\n        // 节点类型：'div' 表示元素，Text 表示文本，对象表示组件\n        type,\n        // 节点属性：id、class、事件监听等\n        props,\n        // 子节点：可以是字符串，也可以是 vnode 数组\n        children,\n        // 指向真实 DOM 的引用，渲染完成后才有值，初始为 null\n        el: null,\n        // 编译器打上的动态标记，本篇后面会细讲\n        patchFlag: 0,\n        // Diff 时用来辨认节点身份的 key\n        key: props && props.key,\n    };\n    return vnode;\n}\n","js","",[1535,1631,1632,1641,1683,1697,1703,1712,1718,1726,1732,1740,1746,1759,1765,1779,1785,1808,1814,1826],{"__ignoreMap":1629},[1633,1634,1637],"span",{"class":1635,"line":1636},"line",1,[1633,1638,1640],{"class":1639},"syuKq","// 简化自 packages/runtime-core/src/vnode.ts\n",[1633,1642,1644,1648,1652,1656,1660,1663,1666,1669,1672,1675,1677,1680],{"class":1635,"line":1643},2,[1633,1645,1647],{"class":1646},"s50WR","function",[1633,1649,1651],{"class":1650},"swgpB"," createVNode",[1633,1653,1655],{"class":1654},"s86vT","(",[1633,1657,1659],{"class":1658},"sK9QF","type",[1633,1661,1662],{"class":1654},",",[1633,1664,1665],{"class":1658}," props",[1633,1667,1668],{"class":1654}," =",[1633,1670,1671],{"class":1654}," null,",[1633,1673,1674],{"class":1658}," children",[1633,1676,1668],{"class":1654},[1633,1678,1679],{"class":1654}," null)",[1633,1681,1682],{"class":1654}," {\n",[1633,1684,1686,1689,1693,1695],{"class":1635,"line":1685},3,[1633,1687,1688],{"class":1646},"    const",[1633,1690,1692],{"class":1691},"sndM8"," vnode",[1633,1694,1668],{"class":1654},[1633,1696,1682],{"class":1654},[1633,1698,1700],{"class":1635,"line":1699},4,[1633,1701,1702],{"class":1639},"        // 节点类型：'div' 表示元素，Text 表示文本，对象表示组件\n",[1633,1704,1706,1709],{"class":1635,"line":1705},5,[1633,1707,1708],{"class":1691},"        type",[1633,1710,1711],{"class":1654},",\n",[1633,1713,1715],{"class":1635,"line":1714},6,[1633,1716,1717],{"class":1639},"        // 节点属性：id、class、事件监听等\n",[1633,1719,1721,1724],{"class":1635,"line":1720},7,[1633,1722,1723],{"class":1691},"        props",[1633,1725,1711],{"class":1654},[1633,1727,1729],{"class":1635,"line":1728},8,[1633,1730,1731],{"class":1639},"        // 子节点：可以是字符串，也可以是 vnode 数组\n",[1633,1733,1735,1738],{"class":1635,"line":1734},9,[1633,1736,1737],{"class":1691},"        children",[1633,1739,1711],{"class":1654},[1633,1741,1743],{"class":1635,"line":1742},10,[1633,1744,1745],{"class":1639},"        // 指向真实 DOM 的引用，渲染完成后才有值，初始为 null\n",[1633,1747,1749,1753,1756],{"class":1635,"line":1748},11,[1633,1750,1752],{"class":1751},"sd2Uz","        el",[1633,1754,1755],{"class":1654},":",[1633,1757,1758],{"class":1654}," null,\n",[1633,1760,1762],{"class":1635,"line":1761},12,[1633,1763,1764],{"class":1639},"        // 编译器打上的动态标记，本篇后面会细讲\n",[1633,1766,1768,1771,1773,1777],{"class":1635,"line":1767},13,[1633,1769,1770],{"class":1751},"        patchFlag",[1633,1772,1755],{"class":1654},[1633,1774,1776],{"class":1775},"smPcV"," 0",[1633,1778,1711],{"class":1654},[1633,1780,1782],{"class":1635,"line":1781},14,[1633,1783,1784],{"class":1639},"        // Diff 时用来辨认节点身份的 key\n",[1633,1786,1788,1791,1793,1795,1798,1800,1803,1806],{"class":1635,"line":1787},15,[1633,1789,1790],{"class":1751},"        key",[1633,1792,1755],{"class":1654},[1633,1794,1665],{"class":1691},[1633,1796,1797],{"class":1654}," &&",[1633,1799,1665],{"class":1691},[1633,1801,1802],{"class":1654},".",[1633,1804,1805],{"class":1691},"key",[1633,1807,1711],{"class":1654},[1633,1809,1811],{"class":1635,"line":1810},16,[1633,1812,1813],{"class":1654},"    };\n",[1633,1815,1817,1821,1823],{"class":1635,"line":1816},17,[1633,1818,1820],{"class":1819},"s8pZq","    return",[1633,1822,1692],{"class":1691},[1633,1824,1825],{"class":1654},";\n",[1633,1827,1829],{"class":1635,"line":1828},18,[1633,1830,1831],{"class":1654},"}\n",[1531,1833,1834,1835,1838,1839,1842],{},"比如 ",[1535,1836,1837],{},"createVNode('div', { id: 'app' }, 'hello')","，对应的就是模板里的 ",[1535,1840,1841],{},"\u003Cdiv id=\"app\">hello\u003C/div>","。记住三点就够了：",[1551,1844,1845,1865,1878],{},[1554,1846,1847,1852,1853,1856,1857,1860,1861,1864],{},[1544,1848,1849,1851],{},[1535,1850,1659],{}," 决定节点身份","：字符串是原生元素，",[1535,1854,1855],{},"Symbol","（如 ",[1535,1858,1859],{},"Text","、",[1535,1862,1863],{},"Fragment","）是内置特殊节点，对象则是组件。",[1554,1866,1867,1873,1874,1877],{},[1544,1868,1869,1872],{},[1535,1870,1871],{},"el"," 让 vnode 能找到真实 DOM","：渲染完成后，",[1535,1875,1876],{},"vnode.el"," 就指向真实 DOM，下次更新时直接拿它做修改。",[1554,1879,1880,1883,1884,1887],{},[1544,1881,1882],{},"创建 vnode 非常便宜","：只是 ",[1535,1885,1886],{},"new"," 一个普通对象，比操作真实 DOM 快得多。这就是「轻量」的含义。",[1594,1889],{},[1526,1891,1893],{"id":1892},"render-与-patch-主干流程","🧱 render 与 patch 主干流程",[1531,1895,1896],{},"vnode 有了，接下来的问题是：它怎么变成页面上的真实 DOM？这一节我们找到整个渲染流程的总入口。先认识两个本篇反复出现的词：**挂载（mount）**是第一次把 vnode 变成真实 DOM、插进页面，**卸载（unmount）**是把真实 DOM 从页面移除。",[1531,1898,1899,1900,1902,1903,1905],{},"总入口是渲染器的 ",[1535,1901,1562],{}," 函数。「渲染器」就是把 vnode 变成真实 DOM 的那套函数，",[1535,1904,1562],{}," 是它们的入口：",[1624,1907,1909],{"className":1626,"code":1908,"language":1628,"meta":1629,"style":1629},"// 简化自 packages/runtime-core/src/renderer.ts\nfunction render(vnode, container) {\n    if (vnode == null) {\n        // 这次没有新 vnode：说明要卸载整个容器里的内容\n        if (container._vnode) {\n            unmount(container._vnode);\n        }\n    } else {\n        // 有新 vnode：拿「上一次的 vnode」和这次的做对比\n        patch(container._vnode, vnode, container);\n    }\n    // 把这次的 vnode 记在容器上，下次更新时它就是「旧 vnode」\n    container._vnode = vnode;\n}\n",[1535,1910,1911,1916,1938,1960,1965,1984,2001,2006,2016,2021,2046,2051,2056,2071],{"__ignoreMap":1629},[1633,1912,1913],{"class":1635,"line":1636},[1633,1914,1915],{"class":1639},"// 简化自 packages/runtime-core/src/renderer.ts\n",[1633,1917,1918,1920,1923,1925,1928,1930,1933,1936],{"class":1635,"line":1643},[1633,1919,1647],{"class":1646},[1633,1921,1922],{"class":1650}," render",[1633,1924,1655],{"class":1654},[1633,1926,1927],{"class":1658},"vnode",[1633,1929,1662],{"class":1654},[1633,1931,1932],{"class":1658}," container",[1633,1934,1935],{"class":1654},")",[1633,1937,1682],{"class":1654},[1633,1939,1940,1943,1946,1948,1951,1954,1957],{"class":1635,"line":1685},[1633,1941,1942],{"class":1819},"    if",[1633,1944,1945],{"class":1751}," (",[1633,1947,1927],{"class":1691},[1633,1949,1950],{"class":1654}," ==",[1633,1952,1953],{"class":1654}," null",[1633,1955,1956],{"class":1751},") ",[1633,1958,1959],{"class":1654},"{\n",[1633,1961,1962],{"class":1635,"line":1699},[1633,1963,1964],{"class":1639},"        // 这次没有新 vnode：说明要卸载整个容器里的内容\n",[1633,1966,1967,1970,1972,1975,1977,1980,1982],{"class":1635,"line":1705},[1633,1968,1969],{"class":1819},"        if",[1633,1971,1945],{"class":1751},[1633,1973,1974],{"class":1691},"container",[1633,1976,1802],{"class":1654},[1633,1978,1979],{"class":1691},"_vnode",[1633,1981,1956],{"class":1751},[1633,1983,1959],{"class":1654},[1633,1985,1986,1989,1991,1993,1995,1997,1999],{"class":1635,"line":1714},[1633,1987,1988],{"class":1650},"            unmount",[1633,1990,1655],{"class":1751},[1633,1992,1974],{"class":1691},[1633,1994,1802],{"class":1654},[1633,1996,1979],{"class":1691},[1633,1998,1935],{"class":1751},[1633,2000,1825],{"class":1654},[1633,2002,2003],{"class":1635,"line":1720},[1633,2004,2005],{"class":1654},"        }\n",[1633,2007,2008,2011,2014],{"class":1635,"line":1728},[1633,2009,2010],{"class":1654},"    }",[1633,2012,2013],{"class":1819}," else",[1633,2015,1682],{"class":1654},[1633,2017,2018],{"class":1635,"line":1734},[1633,2019,2020],{"class":1639},"        // 有新 vnode：拿「上一次的 vnode」和这次的做对比\n",[1633,2022,2023,2026,2028,2030,2032,2034,2036,2038,2040,2042,2044],{"class":1635,"line":1742},[1633,2024,2025],{"class":1650},"        patch",[1633,2027,1655],{"class":1751},[1633,2029,1974],{"class":1691},[1633,2031,1802],{"class":1654},[1633,2033,1979],{"class":1691},[1633,2035,1662],{"class":1654},[1633,2037,1692],{"class":1691},[1633,2039,1662],{"class":1654},[1633,2041,1932],{"class":1691},[1633,2043,1935],{"class":1751},[1633,2045,1825],{"class":1654},[1633,2047,2048],{"class":1635,"line":1748},[1633,2049,2050],{"class":1654},"    }\n",[1633,2052,2053],{"class":1635,"line":1761},[1633,2054,2055],{"class":1639},"    // 把这次的 vnode 记在容器上，下次更新时它就是「旧 vnode」\n",[1633,2057,2058,2061,2063,2065,2067,2069],{"class":1635,"line":1767},[1633,2059,2060],{"class":1691},"    container",[1633,2062,1802],{"class":1654},[1633,2064,1979],{"class":1691},[1633,2066,1668],{"class":1654},[1633,2068,1692],{"class":1691},[1633,2070,1825],{"class":1654},[1633,2072,2073],{"class":1635,"line":1781},[1633,2074,1831],{"class":1654},[1531,2076,2077],{},"主干逻辑就两种情况：",[1551,2079,2080,2094],{},[1554,2081,2082,2085,2086,2089,2090,2093],{},[1544,2083,2084],{},"没有旧 vnode","（",[1535,2087,2088],{},"container._vnode"," 为 null）：说明是首次渲染，直接走",[1544,2091,2092],{},"挂载","，从无到有创建真实 DOM。",[1554,2095,2096,2099,2100,2102,2103,2106],{},[1544,2097,2098],{},"有旧 vnode","：说明是更新，新旧两个 vnode 进入 ",[1535,2101,1566],{}," 做",[1544,2104,2105],{},"对比更新","，只改有变化的地方。",[1531,2108,2109,2110,2113,2114,1612],{},"前几篇讲的组件更新走的正是第二条路：渲染 effect 重新执行，产出新的 vnode，然后调用 ",[1535,2111,2112],{},"patch(旧vnode, 新vnode)","。所以 ",[1544,2115,2116],{},"patch 是更新时真正干活的地方",[2118,2119,2120],"tip",{},[1531,2121,2122,2124],{},[1535,2123,1979],{}," 是 Vue 挂在 DOM 容器上的一个字段，记录上一次渲染的 vnode。没有它，下次更新就没有旧节点可以对比。",[1594,2126],{},[1526,2128,2130],{"id":2129},"patch-的分支处理","🧱 patch 的分支处理",[1531,2132,2133,2134],{},"patch 拿到新旧两个 vnode 后先做什么？这一节拆开看：",[1544,2135,2136],{},"先判断「是不是同一个节点」，再按类型分流处理。",[1624,2138,2140],{"className":1626,"code":2139,"language":1628,"meta":1629,"style":1629},"// 简化自 packages/runtime-core/src/renderer.ts\n// 判断是不是同一个节点，标准很严格：类型和 key 都相同\nfunction isSameVNodeType(n1, n2) {\n    return n1.type === n2.type && n1.key === n2.key;\n}\n",[1535,2141,2142,2146,2151,2172,2210],{"__ignoreMap":1629},[1633,2143,2144],{"class":1635,"line":1636},[1633,2145,1915],{"class":1639},[1633,2147,2148],{"class":1635,"line":1643},[1633,2149,2150],{"class":1639},"// 判断是不是同一个节点，标准很严格：类型和 key 都相同\n",[1633,2152,2153,2155,2158,2160,2163,2165,2168,2170],{"class":1635,"line":1685},[1633,2154,1647],{"class":1646},[1633,2156,2157],{"class":1650}," isSameVNodeType",[1633,2159,1655],{"class":1654},[1633,2161,2162],{"class":1658},"n1",[1633,2164,1662],{"class":1654},[1633,2166,2167],{"class":1658}," n2",[1633,2169,1935],{"class":1654},[1633,2171,1682],{"class":1654},[1633,2173,2174,2176,2179,2181,2183,2186,2188,2190,2192,2194,2196,2198,2200,2202,2204,2206,2208],{"class":1635,"line":1699},[1633,2175,1820],{"class":1819},[1633,2177,2178],{"class":1691}," n1",[1633,2180,1802],{"class":1654},[1633,2182,1659],{"class":1691},[1633,2184,2185],{"class":1654}," ===",[1633,2187,2167],{"class":1691},[1633,2189,1802],{"class":1654},[1633,2191,1659],{"class":1691},[1633,2193,1797],{"class":1654},[1633,2195,2178],{"class":1691},[1633,2197,1802],{"class":1654},[1633,2199,1805],{"class":1691},[1633,2201,2185],{"class":1654},[1633,2203,2167],{"class":1691},[1633,2205,1802],{"class":1654},[1633,2207,1805],{"class":1691},[1633,2209,1825],{"class":1654},[1633,2211,2212],{"class":1635,"line":1705},[1633,2213,1831],{"class":1654},[1531,2215,2216,2217,2220,2221,2224,2225,2228,2229,2231],{},"如果 ",[1535,2218,2219],{},"\u003Cdiv>"," 变成了 ",[1535,2222,2223],{},"\u003Cp>","，或者 key 变了，Vue3 不会费力去对比，直接卸载旧的、挂载新的。这也回答了为什么 ",[1535,2226,2227],{},"v-for"," 里的 key 很重要，问答环节会展开。通过判断后，patch 按 ",[1535,2230,1659],{}," 把节点分流到不同的处理函数：",[1624,2233,2235],{"className":1626,"code":2234,"language":1628,"meta":1629,"style":1629},"// 简化自 packages/runtime-core/src/renderer.ts\nfunction patch(n1, n2, container) {\n    // n1 存在但不是同一个节点：卸载旧的，之后按新节点重新挂载\n    if (n1 && !isSameVNodeType(n1, n2)) {\n        unmount(n1);\n        n1 = null; // 置空后，后面会按「首次挂载」处理\n    }\n\n    const { type } = n2;\n\n    if (type === Text) {\n        // 文本节点\n        processText(n1, n2, container);\n    } else if (typeof type === 'string') {\n        // 原生元素节点，如 'div'、'span'\n        processElement(n1, n2, container);\n    } else if (typeof type === 'object') {\n        // 组件节点\n        processComponent(n1, n2, container);\n    }\n}\n",[1535,2236,2237,2241,2264,2269,2298,2311,2324,2328,2334,2353,2357,2374,2379,2400,2432,2437,2458,2485,2490,2512,2517],{"__ignoreMap":1629},[1633,2238,2239],{"class":1635,"line":1636},[1633,2240,1915],{"class":1639},[1633,2242,2243,2245,2248,2250,2252,2254,2256,2258,2260,2262],{"class":1635,"line":1643},[1633,2244,1647],{"class":1646},[1633,2246,2247],{"class":1650}," patch",[1633,2249,1655],{"class":1654},[1633,2251,2162],{"class":1658},[1633,2253,1662],{"class":1654},[1633,2255,2167],{"class":1658},[1633,2257,1662],{"class":1654},[1633,2259,1932],{"class":1658},[1633,2261,1935],{"class":1654},[1633,2263,1682],{"class":1654},[1633,2265,2266],{"class":1635,"line":1685},[1633,2267,2268],{"class":1639},"    // n1 存在但不是同一个节点：卸载旧的，之后按新节点重新挂载\n",[1633,2270,2271,2273,2275,2277,2279,2282,2285,2287,2289,2291,2293,2296],{"class":1635,"line":1699},[1633,2272,1942],{"class":1819},[1633,2274,1945],{"class":1751},[1633,2276,2162],{"class":1691},[1633,2278,1797],{"class":1654},[1633,2280,2281],{"class":1654}," !",[1633,2283,2284],{"class":1650},"isSameVNodeType",[1633,2286,1655],{"class":1751},[1633,2288,2162],{"class":1691},[1633,2290,1662],{"class":1654},[1633,2292,2167],{"class":1691},[1633,2294,2295],{"class":1751},")) ",[1633,2297,1959],{"class":1654},[1633,2299,2300,2303,2305,2307,2309],{"class":1635,"line":1705},[1633,2301,2302],{"class":1650},"        unmount",[1633,2304,1655],{"class":1751},[1633,2306,2162],{"class":1691},[1633,2308,1935],{"class":1751},[1633,2310,1825],{"class":1654},[1633,2312,2313,2316,2318,2321],{"class":1635,"line":1714},[1633,2314,2315],{"class":1691},"        n1",[1633,2317,1668],{"class":1654},[1633,2319,2320],{"class":1654}," null;",[1633,2322,2323],{"class":1639}," // 置空后，后面会按「首次挂载」处理\n",[1633,2325,2326],{"class":1635,"line":1720},[1633,2327,2050],{"class":1654},[1633,2329,2330],{"class":1635,"line":1728},[1633,2331,2333],{"emptyLinePlaceholder":2332},true,"\n",[1633,2335,2336,2338,2341,2344,2347,2349,2351],{"class":1635,"line":1734},[1633,2337,1688],{"class":1646},[1633,2339,2340],{"class":1654}," {",[1633,2342,2343],{"class":1691}," type",[1633,2345,2346],{"class":1654}," }",[1633,2348,1668],{"class":1654},[1633,2350,2167],{"class":1691},[1633,2352,1825],{"class":1654},[1633,2354,2355],{"class":1635,"line":1742},[1633,2356,2333],{"emptyLinePlaceholder":2332},[1633,2358,2359,2361,2363,2365,2367,2370,2372],{"class":1635,"line":1748},[1633,2360,1942],{"class":1819},[1633,2362,1945],{"class":1751},[1633,2364,1659],{"class":1691},[1633,2366,2185],{"class":1654},[1633,2368,2369],{"class":1691}," Text",[1633,2371,1956],{"class":1751},[1633,2373,1959],{"class":1654},[1633,2375,2376],{"class":1635,"line":1761},[1633,2377,2378],{"class":1639},"        // 文本节点\n",[1633,2380,2381,2384,2386,2388,2390,2392,2394,2396,2398],{"class":1635,"line":1767},[1633,2382,2383],{"class":1650},"        processText",[1633,2385,1655],{"class":1751},[1633,2387,2162],{"class":1691},[1633,2389,1662],{"class":1654},[1633,2391,2167],{"class":1691},[1633,2393,1662],{"class":1654},[1633,2395,1932],{"class":1691},[1633,2397,1935],{"class":1751},[1633,2399,1825],{"class":1654},[1633,2401,2402,2404,2406,2409,2411,2414,2416,2418,2421,2425,2428,2430],{"class":1635,"line":1781},[1633,2403,2010],{"class":1654},[1633,2405,2013],{"class":1819},[1633,2407,2408],{"class":1819}," if",[1633,2410,1945],{"class":1751},[1633,2412,2413],{"class":1654},"typeof",[1633,2415,2343],{"class":1691},[1633,2417,2185],{"class":1654},[1633,2419,2420],{"class":1654}," '",[1633,2422,2424],{"class":2423},"sIEYB","string",[1633,2426,2427],{"class":1654},"'",[1633,2429,1956],{"class":1751},[1633,2431,1959],{"class":1654},[1633,2433,2434],{"class":1635,"line":1787},[1633,2435,2436],{"class":1639},"        // 原生元素节点，如 'div'、'span'\n",[1633,2438,2439,2442,2444,2446,2448,2450,2452,2454,2456],{"class":1635,"line":1810},[1633,2440,2441],{"class":1650},"        processElement",[1633,2443,1655],{"class":1751},[1633,2445,2162],{"class":1691},[1633,2447,1662],{"class":1654},[1633,2449,2167],{"class":1691},[1633,2451,1662],{"class":1654},[1633,2453,1932],{"class":1691},[1633,2455,1935],{"class":1751},[1633,2457,1825],{"class":1654},[1633,2459,2460,2462,2464,2466,2468,2470,2472,2474,2476,2479,2481,2483],{"class":1635,"line":1816},[1633,2461,2010],{"class":1654},[1633,2463,2013],{"class":1819},[1633,2465,2408],{"class":1819},[1633,2467,1945],{"class":1751},[1633,2469,2413],{"class":1654},[1633,2471,2343],{"class":1691},[1633,2473,2185],{"class":1654},[1633,2475,2420],{"class":1654},[1633,2477,2478],{"class":2423},"object",[1633,2480,2427],{"class":1654},[1633,2482,1956],{"class":1751},[1633,2484,1959],{"class":1654},[1633,2486,2487],{"class":1635,"line":1828},[1633,2488,2489],{"class":1639},"        // 组件节点\n",[1633,2491,2493,2496,2498,2500,2502,2504,2506,2508,2510],{"class":1635,"line":2492},19,[1633,2494,2495],{"class":1650},"        processComponent",[1633,2497,1655],{"class":1751},[1633,2499,2162],{"class":1691},[1633,2501,1662],{"class":1654},[1633,2503,2167],{"class":1691},[1633,2505,1662],{"class":1654},[1633,2507,1932],{"class":1691},[1633,2509,1935],{"class":1751},[1633,2511,1825],{"class":1654},[1633,2513,2515],{"class":1635,"line":2514},20,[1633,2516,2050],{"class":1654},[1633,2518,2520],{"class":1635,"line":2519},21,[1633,2521,1831],{"class":1654},[1531,2523,2524],{},"分流之后，我们重点看最常见的元素节点：先决定挂载还是更新，更新时只对比 props 和 children。",[1624,2526,2528],{"className":1626,"code":2527,"language":1628,"meta":1629,"style":1629},"// 简化自 packages/runtime-core/src/renderer.ts\nfunction processElement(n1, n2, container) {\n    if (n1 == null) {\n        // 没有旧节点：走挂载，创建真实 DOM 并插入\n        mountElement(n2, container);\n    } else {\n        // 有旧节点：走对比更新\n        patchElement(n1, n2);\n    }\n}\n\nfunction patchElement(n1, n2) {\n    // 关键一步：复用旧的真实 DOM，不用重新创建\n    const el = (n2.el = n1.el);\n\n    // 1. 对比 props：class、style、事件等，有变化才改\n    patchProps(el, n1.props, n2.props);\n\n    // 2. 对比 children\n    patchChildren(n1, n2, el);\n}\n",[1535,2529,2530,2534,2557,2573,2578,2596,2604,2609,2626,2630,2634,2638,2657,2662,2691,2695,2700,2730,2734,2739,2760],{"__ignoreMap":1629},[1633,2531,2532],{"class":1635,"line":1636},[1633,2533,1915],{"class":1639},[1633,2535,2536,2538,2541,2543,2545,2547,2549,2551,2553,2555],{"class":1635,"line":1643},[1633,2537,1647],{"class":1646},[1633,2539,2540],{"class":1650}," processElement",[1633,2542,1655],{"class":1654},[1633,2544,2162],{"class":1658},[1633,2546,1662],{"class":1654},[1633,2548,2167],{"class":1658},[1633,2550,1662],{"class":1654},[1633,2552,1932],{"class":1658},[1633,2554,1935],{"class":1654},[1633,2556,1682],{"class":1654},[1633,2558,2559,2561,2563,2565,2567,2569,2571],{"class":1635,"line":1685},[1633,2560,1942],{"class":1819},[1633,2562,1945],{"class":1751},[1633,2564,2162],{"class":1691},[1633,2566,1950],{"class":1654},[1633,2568,1953],{"class":1654},[1633,2570,1956],{"class":1751},[1633,2572,1959],{"class":1654},[1633,2574,2575],{"class":1635,"line":1699},[1633,2576,2577],{"class":1639},"        // 没有旧节点：走挂载，创建真实 DOM 并插入\n",[1633,2579,2580,2583,2585,2588,2590,2592,2594],{"class":1635,"line":1705},[1633,2581,2582],{"class":1650},"        mountElement",[1633,2584,1655],{"class":1751},[1633,2586,2587],{"class":1691},"n2",[1633,2589,1662],{"class":1654},[1633,2591,1932],{"class":1691},[1633,2593,1935],{"class":1751},[1633,2595,1825],{"class":1654},[1633,2597,2598,2600,2602],{"class":1635,"line":1714},[1633,2599,2010],{"class":1654},[1633,2601,2013],{"class":1819},[1633,2603,1682],{"class":1654},[1633,2605,2606],{"class":1635,"line":1720},[1633,2607,2608],{"class":1639},"        // 有旧节点：走对比更新\n",[1633,2610,2611,2614,2616,2618,2620,2622,2624],{"class":1635,"line":1728},[1633,2612,2613],{"class":1650},"        patchElement",[1633,2615,1655],{"class":1751},[1633,2617,2162],{"class":1691},[1633,2619,1662],{"class":1654},[1633,2621,2167],{"class":1691},[1633,2623,1935],{"class":1751},[1633,2625,1825],{"class":1654},[1633,2627,2628],{"class":1635,"line":1734},[1633,2629,2050],{"class":1654},[1633,2631,2632],{"class":1635,"line":1742},[1633,2633,1831],{"class":1654},[1633,2635,2636],{"class":1635,"line":1748},[1633,2637,2333],{"emptyLinePlaceholder":2332},[1633,2639,2640,2642,2645,2647,2649,2651,2653,2655],{"class":1635,"line":1761},[1633,2641,1647],{"class":1646},[1633,2643,2644],{"class":1650}," patchElement",[1633,2646,1655],{"class":1654},[1633,2648,2162],{"class":1658},[1633,2650,1662],{"class":1654},[1633,2652,2167],{"class":1658},[1633,2654,1935],{"class":1654},[1633,2656,1682],{"class":1654},[1633,2658,2659],{"class":1635,"line":1767},[1633,2660,2661],{"class":1639},"    // 关键一步：复用旧的真实 DOM，不用重新创建\n",[1633,2663,2664,2666,2669,2671,2673,2675,2677,2679,2681,2683,2685,2687,2689],{"class":1635,"line":1781},[1633,2665,1688],{"class":1646},[1633,2667,2668],{"class":1691}," el",[1633,2670,1668],{"class":1654},[1633,2672,1945],{"class":1751},[1633,2674,2587],{"class":1691},[1633,2676,1802],{"class":1654},[1633,2678,1871],{"class":1691},[1633,2680,1668],{"class":1654},[1633,2682,2178],{"class":1691},[1633,2684,1802],{"class":1654},[1633,2686,1871],{"class":1691},[1633,2688,1935],{"class":1751},[1633,2690,1825],{"class":1654},[1633,2692,2693],{"class":1635,"line":1787},[1633,2694,2333],{"emptyLinePlaceholder":2332},[1633,2696,2697],{"class":1635,"line":1810},[1633,2698,2699],{"class":1639},"    // 1. 对比 props：class、style、事件等，有变化才改\n",[1633,2701,2702,2705,2707,2709,2711,2713,2715,2718,2720,2722,2724,2726,2728],{"class":1635,"line":1816},[1633,2703,2704],{"class":1650},"    patchProps",[1633,2706,1655],{"class":1751},[1633,2708,1871],{"class":1691},[1633,2710,1662],{"class":1654},[1633,2712,2178],{"class":1691},[1633,2714,1802],{"class":1654},[1633,2716,2717],{"class":1691},"props",[1633,2719,1662],{"class":1654},[1633,2721,2167],{"class":1691},[1633,2723,1802],{"class":1654},[1633,2725,2717],{"class":1691},[1633,2727,1935],{"class":1751},[1633,2729,1825],{"class":1654},[1633,2731,2732],{"class":1635,"line":1828},[1633,2733,2333],{"emptyLinePlaceholder":2332},[1633,2735,2736],{"class":1635,"line":2492},[1633,2737,2738],{"class":1639},"    // 2. 对比 children\n",[1633,2740,2741,2744,2746,2748,2750,2752,2754,2756,2758],{"class":1635,"line":2514},[1633,2742,2743],{"class":1650},"    patchChildren",[1633,2745,1655],{"class":1751},[1633,2747,2162],{"class":1691},[1633,2749,1662],{"class":1654},[1633,2751,2167],{"class":1691},[1633,2753,1662],{"class":1654},[1633,2755,2668],{"class":1691},[1633,2757,1935],{"class":1751},[1633,2759,1825],{"class":1654},[1633,2761,2762],{"class":1635,"line":2519},[1633,2763,1831],{"class":1654},[1531,2765,2766,2767,1612,2770,2773,2774,2777],{},"可以看到 Vue3 更新元素的整体思路：",[1544,2768,2769],{},"真实 DOM 能复用就复用，只改变化的部分",[1535,2771,2772],{},"patchChildren"," 又会按子节点的形态分流：文本对文本直接替换文本；数组对数组就进入 ",[1544,2775,2776],{},"Diff"," 流程，也就是「对比两组子节点、找出需要改动的地方」。",[1594,2779],{},[1526,2781,2783],{"id":2782},"diff-与编译优化","🧱 Diff 与编译优化",[1531,2785,2786,2787],{},"children 都是数组时，Vue2 会把两组子节点从头到尾做一次完整对比，节点一多成本就不小。这一节回答的疑问是：",[1544,2788,2789],{},"Vue3 凭什么能做到不全量对比？",[1531,2791,2792,2793,2796,2797,2800],{},"答案是：把分析工作提前到",[1544,2794,2795],{},"编译期","。编译期是构建工具把模板翻译成 render 函数的阶段（代码还没在浏览器里跑），浏览器里真正执行的阶段叫",[1544,2798,2799],{},"运行时","。Vue3 在编译期就把「模板里哪些地方会变」分析好、记在 vnode 上，运行时直接读取这些标记来决定怎么更新。这些标记由两部分组成。",[2802,2803,2805],"h3",{"id":2804},"优化一patchflag-标记变化类型","优化一：PatchFlag 标记变化类型",[1531,2807,2808,2809,2812],{},"编译器分析每个节点：哪些部分永远不变（静态），哪些可能变（动态），动态的是哪一类变化。分析结果以一个数字标记 ",[1535,2810,2811],{},"patchFlag"," 打在 vnode 上，每个数字对应一种变化类型：",[1624,2814,2816],{"className":1626,"code":2815,"language":1628,"meta":1629,"style":1629},"// 简化自 packages/shared/src/patchFlags.ts\nconst PatchFlags = {\n    TEXT: 1, // 文本内容是动态的\n    CLASS: 2, // class 是动态的\n    STYLE: 4, // style 是动态的\n    PROPS: 8, // 普通属性是动态的\n    // ... 其他标记，了解即可\n};\n",[1535,2817,2818,2823,2836,2851,2866,2881,2896,2901],{"__ignoreMap":1629},[1633,2819,2820],{"class":1635,"line":1636},[1633,2821,2822],{"class":1639},"// 简化自 packages/shared/src/patchFlags.ts\n",[1633,2824,2825,2828,2831,2834],{"class":1635,"line":1643},[1633,2826,2827],{"class":1646},"const",[1633,2829,2830],{"class":1691}," PatchFlags ",[1633,2832,2833],{"class":1654},"=",[1633,2835,1682],{"class":1654},[1633,2837,2838,2841,2843,2846,2848],{"class":1635,"line":1685},[1633,2839,2840],{"class":1751},"    TEXT",[1633,2842,1755],{"class":1654},[1633,2844,2845],{"class":1775}," 1",[1633,2847,1662],{"class":1654},[1633,2849,2850],{"class":1639}," // 文本内容是动态的\n",[1633,2852,2853,2856,2858,2861,2863],{"class":1635,"line":1699},[1633,2854,2855],{"class":1751},"    CLASS",[1633,2857,1755],{"class":1654},[1633,2859,2860],{"class":1775}," 2",[1633,2862,1662],{"class":1654},[1633,2864,2865],{"class":1639}," // class 是动态的\n",[1633,2867,2868,2871,2873,2876,2878],{"class":1635,"line":1705},[1633,2869,2870],{"class":1751},"    STYLE",[1633,2872,1755],{"class":1654},[1633,2874,2875],{"class":1775}," 4",[1633,2877,1662],{"class":1654},[1633,2879,2880],{"class":1639}," // style 是动态的\n",[1633,2882,2883,2886,2888,2891,2893],{"class":1635,"line":1714},[1633,2884,2885],{"class":1751},"    PROPS",[1633,2887,1755],{"class":1654},[1633,2889,2890],{"class":1775}," 8",[1633,2892,1662],{"class":1654},[1633,2894,2895],{"class":1639}," // 普通属性是动态的\n",[1633,2897,2898],{"class":1635,"line":1720},[1633,2899,2900],{"class":1639},"    // ... 其他标记，了解即可\n",[1633,2902,2903],{"class":1635,"line":1728},[1633,2904,2905],{"class":1654},"};\n",[1531,2907,2908],{},"举个例子：",[1624,2910,2914],{"className":2911,"code":2912,"language":2913,"meta":1629,"style":1629},"language-html shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cdiv>\n    \u003Cp>静态内容，永远不变\u003C/p>\n    \u003Cp :class=\"cls\">{{ msg }}\u003C/p>\n\u003C/div>\n","html",[1535,2915,2916,2927,2947,2977],{"__ignoreMap":1629},[1633,2917,2918,2921,2924],{"class":1635,"line":1636},[1633,2919,2920],{"class":1654},"\u003C",[1633,2922,2923],{"class":1751},"div",[1633,2925,2926],{"class":1654},">\n",[1633,2928,2929,2932,2934,2937,2940,2943,2945],{"class":1635,"line":1643},[1633,2930,2931],{"class":1654},"    \u003C",[1633,2933,1531],{"class":1751},[1633,2935,2936],{"class":1654},">",[1633,2938,2939],{"class":1691},"静态内容，永远不变",[1633,2941,2942],{"class":1654},"\u003C/",[1633,2944,1531],{"class":1751},[1633,2946,2926],{"class":1654},[1633,2948,2949,2951,2953,2956,2958,2961,2964,2966,2968,2971,2973,2975],{"class":1635,"line":1685},[1633,2950,2931],{"class":1654},[1633,2952,1531],{"class":1751},[1633,2954,2955],{"class":1646}," :class",[1633,2957,2833],{"class":1654},[1633,2959,2960],{"class":1654},"\"",[1633,2962,2963],{"class":2423},"cls",[1633,2965,2960],{"class":1654},[1633,2967,2936],{"class":1654},[1633,2969,2970],{"class":1691},"{{ msg }}",[1633,2972,2942],{"class":1654},[1633,2974,1531],{"class":1751},[1633,2976,2926],{"class":1654},[1633,2978,2979,2981,2983],{"class":1635,"line":1699},[1633,2980,2942],{"class":1654},[1633,2982,2923],{"class":1751},[1633,2984,2926],{"class":1654},[1531,2986,2987,2988,2990,2991,2994,2995,2998],{},"编译后，第二个 ",[1535,2989,2223],{}," 会被打上 ",[1535,2992,2993],{},"TEXT | CLASS"," 的标记（值为 ",[1535,2996,2997],{},"1 | 2 = 3","）。更新时 patch 一看这个标记就知道：这个节点只需要检查文本和 class，其他 props、事件监听统统不用碰。",[2802,3000,3002],{"id":3001},"优化二block-收集动态节点","优化二：Block 收集动态节点",[1531,3004,3005,3006,3009,3010,3013],{},"光知道「单个节点哪里会变」还不够。如果动态节点藏在一棵很大的静态树里，更新时还是得一层层找下去。Vue3 的第二个优化是 ",[1544,3007,3008],{},"Block","：编译时把一棵子树里所有动态节点收集成一个扁平列表，挂在根节点的 ",[1535,3011,3012],{},"dynamicChildren"," 上。",[1624,3015,3017],{"className":1626,"code":3016,"language":1628,"meta":1629,"style":1629},"// 编译后的效果（概念示意，不是真实可运行代码）\nconst block = {\n    type: 'div',\n    children: [\n        /* 一百个静态节点... 和一个动态节点 */\n    ],\n    // 动态节点被单独收集到这里，更新时直接遍历这个列表\n    dynamicChildren: [动态p节点的vnode],\n};\n",[1535,3018,3019,3024,3035,3050,3060,3065,3072,3077,3089],{"__ignoreMap":1629},[1633,3020,3021],{"class":1635,"line":1636},[1633,3022,3023],{"class":1639},"// 编译后的效果（概念示意，不是真实可运行代码）\n",[1633,3025,3026,3028,3031,3033],{"class":1635,"line":1643},[1633,3027,2827],{"class":1646},[1633,3029,3030],{"class":1691}," block ",[1633,3032,2833],{"class":1654},[1633,3034,1682],{"class":1654},[1633,3036,3037,3040,3042,3044,3046,3048],{"class":1635,"line":1685},[1633,3038,3039],{"class":1751},"    type",[1633,3041,1755],{"class":1654},[1633,3043,2420],{"class":1654},[1633,3045,2923],{"class":2423},[1633,3047,2427],{"class":1654},[1633,3049,1711],{"class":1654},[1633,3051,3052,3055,3057],{"class":1635,"line":1699},[1633,3053,3054],{"class":1751},"    children",[1633,3056,1755],{"class":1654},[1633,3058,3059],{"class":1691}," [\n",[1633,3061,3062],{"class":1635,"line":1705},[1633,3063,3064],{"class":1639},"        /* 一百个静态节点... 和一个动态节点 */\n",[1633,3066,3067,3070],{"class":1635,"line":1714},[1633,3068,3069],{"class":1691},"    ]",[1633,3071,1711],{"class":1654},[1633,3073,3074],{"class":1635,"line":1720},[1633,3075,3076],{"class":1639},"    // 动态节点被单独收集到这里，更新时直接遍历这个列表\n",[1633,3078,3079,3082,3084,3087],{"class":1635,"line":1728},[1633,3080,3081],{"class":1751},"    dynamicChildren",[1633,3083,1755],{"class":1654},[1633,3085,3086],{"class":1691}," [动态p节点的vnode]",[1633,3088,1711],{"class":1654},[1633,3090,3091],{"class":1635,"line":1734},[1633,3092,2905],{"class":1654},[1531,3094,3095,3096,3102],{},"这样更新这棵树时，",[1544,3097,3098,3099,3101],{},"只遍历 ",[1535,3100,3012],{}," 里那几个动态节点，静态内容全部跳过","。哪怕静态节点有一百个，更新成本也只和动态节点的数量有关。",[1531,3104,3105],{},"换句话说，Vue2 更新时必须逐个节点检查，不管它会不会变；Vue3 则在编译期就拿到了动态节点的列表，运行时只检查列表里的这几个节点，所以更新成本只和动态节点的数量有关，和静态节点多少无关。",[2118,3107,3108],{},[1531,3109,3110],{},"PatchFlag 和 Block 都是编译期生成的，运行时只是读取并使用这些标记。所以模板写法能享受这份优化，纯手写 render 函数则享受不到。具体的编译过程下一篇细讲。",[1594,3112],{},[1526,3114,3116],{"id":3115},"与-vue2-patch-对比","⚡ 与 Vue2 patch 对比",[1531,3118,3119,3120,3124],{},"如果你读过 ",[3121,3122,3123],"a",{"href":1386},"Vue2 源码课程","，可以把两个版本的 patch 放在一起看，差异一目了然：",[1551,3126,3127,3132],{},[1554,3128,3129,3131],{},[1544,3130,559],{},"：运行时拿到新旧 vnode 树，走双端 Diff 做全量对比，每个节点都要比一轮，静态内容也逃不过。因为编译期没有留下任何标记，运行时只能全部比一遍。",[1554,3133,3134,3136,3137,3140],{},[1544,3135,666],{},"：编译期就分析好动静结构，用 PatchFlag 标记变化类型、用 Block 收集动态节点。运行时依据这些标记做",[1544,3138,3139],{},"定向更新","，静态子树整体跳过。",[1531,3142,3143,3144,1612],{},"所以 Vue3 渲染性能的提升，核心思路不是「Diff 算法写得更快」，而是",[1544,3145,3146],{},"把能做的事提前到编译期，让运行时少做事",[2118,3148,3149],{},[1531,3150,3151,3152,3155],{},"当 children 结构完全动态时（比如纯手写 render、动态生成的列表），编译器无法预知结构，Vue3 会退回传统的数组 Diff。数组 Diff 的详细算法（双端比较、key 的作用、最长递增子序列）在 ",[3121,3153,3154],{"href":936},"Snabbdom 课程"," 里完整讲过，这里了解即可，不用记。",[1594,3157],{},[1526,3159,3161],{"id":3160},"小节总结","🧾 小节总结",[1551,3163,3164,3175,3183,3191,3194],{},[1554,3165,3166,3167,1860,3169,1860,3171,3174],{},"VNode 是描述界面的普通 JS 对象，核心字段是 ",[1535,3168,1659],{},[1535,3170,2717],{},[1535,3172,3173],{},"children","，它是真实 DOM 的轻量替身，创建成本很低。",[1554,3176,3177,3179,3180,3182],{},[1535,3178,1562],{}," 是渲染总入口：没有旧 vnode 走挂载，有旧 vnode 走 patch 对比更新，容器上的 ",[1535,3181,1979],{}," 记录上一次的结果。",[1554,3184,3185,3187,3188,3190],{},[1535,3186,1566],{}," 先判断是不是同一个节点（类型和 key 都相同），不是就直接卸载重挂；是就按 ",[1535,3189,1659],{}," 分流，文本、元素、组件各走各的处理函数。",[1554,3192,3193],{},"元素更新时复用真实 DOM，只对比 props 和 children；children 都是数组时进入 Diff。",[1554,3195,3196],{},"Vue3 的编译优化：PatchFlag 标记动态内容的变化类型，Block 把动态节点收集成列表，更新时跳过所有静态内容，实现定向更新。",[1594,3198],{},[1526,3200,3202],{"id":3201},"知识问答","❓ 知识问答",[1531,3204,3205],{},[1544,3206,3207],{},"Q1：既然浏览器最终还是要操作真实 DOM，中间加一层虚拟 DOM 有什么价值？",[1531,3209,3210,3211,3214,3215,3218],{},"A：价值主要有两个。一是",[1544,3212,3213],{},"描述与渲染解耦","：vnode 只是普通对象，同一套描述可以渲染到浏览器、原生端，甚至用来做测试快照，不限于 DOM。二是",[1544,3216,3217],{},"便于计算差异","：在 JS 对象上对比新旧两棵树很便宜，比直接读写真实 DOM 划算得多。配合编译优化，真正昂贵的 DOM 操作被压缩到了必要的范围。",[1531,3220,3221],{},[1544,3222,3223],{},"Q2：PatchFlag 是谁生成的？运行时还是编译时？",[1531,3225,3226],{},"A：编译时。模板编译器分析模板后，在生成 render 函数的代码里把 PatchFlag 和 Block 结构写好。运行时只是读取这些标记来决定对比策略。这也是为什么手写 render 函数享受不到这份优化，下一篇讲模板编译时会看到它们具体是怎么生成的。",[1531,3228,3229],{},[1544,3230,3231,3232,3234],{},"Q3：",[1535,3233,2227],{}," 里的 key 为什么重要？",[1531,3236,3237],{},"A：patch 和 Diff 都靠 key 判断「两个 vnode 是不是同一个节点」。有了稳定唯一的 key，Vue 能准确识别每个节点的新位置，复用对应的真实 DOM 和组件状态。如果 key 用 index，列表顺序变化时 key 会和节点错位，导致复用错误的 DOM，出现输入框内容串位、状态混乱这类问题。",[1531,3239,3240],{},[1544,3241,3242],{},"Q4：类型不同的两个 vnode，Vue3 会怎么处理？",[1531,3244,3245,3246,3248],{},"A：直接放弃对比。",[1535,3247,2284],{}," 判断类型或 key 不同后，旧节点被卸载，新节点重新挂载。Vue 不做「勉强复用」的尝试，因为跨类型的对比成本往往比直接重建还高。",[1531,3250,3251],{},[1544,3252,3253],{},"Q5：Block 优化后，传统的 Diff 算法还用得上吗？",[1531,3255,3256],{},"A：用得上。Block 处理的是「模板里动静结构明确」的常见场景；当 children 是完全动态的数组（比如手写 render 动态生成列表），编译器无法预知结构，就需要退回数组 Diff，靠 key 和双端比较来求出更少的移动次数。",[1594,3258],{},[1526,3260,3262],{"id":3261},"小练习","🧪 小练习",[1531,3264,3265,3266,3268,3269,1860,3271,1860,3273,3275,3276,1860,3278,1860,3280,1860,3282,3284,3285,3288],{},"不查资料，手写一个迷你 ",[1535,3267,1618],{}," 函数：接收 ",[1535,3270,1659],{},[1535,3272,2717],{},[1535,3274,3173],{}," 三个参数，返回一个 vnode 对象（至少包含 ",[1535,3277,1659],{},[1535,3279,2717],{},[1535,3281,3173],{},[1535,3283,1805],{}," 四个字段），然后用它描述一棵两层的界面结构并打印出来。用 Node.js v22 保存为 ",[1535,3286,3287],{},".js"," 文件直接运行验证。",[1624,3290,3292],{"className":1626,"code":3291,"language":1628,"meta":1629,"style":1629},"function h(type, props, children) {\n    // 请在这里编写代码\n}\n\n// 用 h 描述：\u003Cdiv id=\"app\">\u003Cp class=\"msg\">hello\u003C/p>\u003C/div>\nconst vnode = h('div', { id: 'app' }, [\n    // 请在这里编写代码：创建 p 节点的 vnode\n]);\n\nconsole.log(JSON.stringify(vnode, null, 2));\n",[1535,3293,3294,3317,3322,3326,3330,3335,3375,3380,3387,3391],{"__ignoreMap":1629},[1633,3295,3296,3298,3301,3303,3305,3307,3309,3311,3313,3315],{"class":1635,"line":1636},[1633,3297,1647],{"class":1646},[1633,3299,3300],{"class":1650}," h",[1633,3302,1655],{"class":1654},[1633,3304,1659],{"class":1658},[1633,3306,1662],{"class":1654},[1633,3308,1665],{"class":1658},[1633,3310,1662],{"class":1654},[1633,3312,1674],{"class":1658},[1633,3314,1935],{"class":1654},[1633,3316,1682],{"class":1654},[1633,3318,3319],{"class":1635,"line":1643},[1633,3320,3321],{"class":1639},"    // 请在这里编写代码\n",[1633,3323,3324],{"class":1635,"line":1685},[1633,3325,1831],{"class":1654},[1633,3327,3328],{"class":1635,"line":1699},[1633,3329,2333],{"emptyLinePlaceholder":2332},[1633,3331,3332],{"class":1635,"line":1705},[1633,3333,3334],{"class":1639},"// 用 h 描述：\u003Cdiv id=\"app\">\u003Cp class=\"msg\">hello\u003C/p>\u003C/div>\n",[1633,3336,3337,3339,3342,3344,3346,3348,3350,3352,3354,3356,3358,3361,3363,3365,3368,3370,3373],{"class":1635,"line":1714},[1633,3338,2827],{"class":1646},[1633,3340,3341],{"class":1691}," vnode ",[1633,3343,2833],{"class":1654},[1633,3345,3300],{"class":1650},[1633,3347,1655],{"class":1691},[1633,3349,2427],{"class":1654},[1633,3351,2923],{"class":2423},[1633,3353,2427],{"class":1654},[1633,3355,1662],{"class":1654},[1633,3357,2340],{"class":1654},[1633,3359,3360],{"class":1751}," id",[1633,3362,1755],{"class":1654},[1633,3364,2420],{"class":1654},[1633,3366,3367],{"class":2423},"app",[1633,3369,2427],{"class":1654},[1633,3371,3372],{"class":1654}," },",[1633,3374,3059],{"class":1691},[1633,3376,3377],{"class":1635,"line":1720},[1633,3378,3379],{"class":1639},"    // 请在这里编写代码：创建 p 节点的 vnode\n",[1633,3381,3382,3385],{"class":1635,"line":1728},[1633,3383,3384],{"class":1691},"])",[1633,3386,1825],{"class":1654},[1633,3388,3389],{"class":1635,"line":1734},[1633,3390,2333],{"emptyLinePlaceholder":2332},[1633,3392,3393,3396,3398,3401,3404,3406,3409,3412,3414,3416,3418,3421],{"class":1635,"line":1742},[1633,3394,3395],{"class":1691},"console",[1633,3397,1802],{"class":1654},[1633,3399,3400],{"class":1650},"log",[1633,3402,3403],{"class":1691},"(JSON",[1633,3405,1802],{"class":1654},[1633,3407,3408],{"class":1650},"stringify",[1633,3410,3411],{"class":1691},"(vnode",[1633,3413,1662],{"class":1654},[1633,3415,1671],{"class":1654},[1633,3417,2860],{"class":1775},[1633,3419,3420],{"class":1691},"))",[1633,3422,1825],{"class":1654},[1531,3424,3425,3426,3428,3429,3431,3432,3435,3436,3439],{},"完成后给自己加个挑战：给你的 vnode 加上 ",[1535,3427,2811],{}," 字段，如果 ",[1535,3430,3173],{}," 是字符串就标记为 ",[1535,3433,3434],{},"1","（动态文本），否则标记为 ",[1535,3437,3438],{},"0","。想一想：这个判断在真实的 Vue 里是在哪一步做的？",[1594,3441],{},[1531,3443,3444],{},"🎉 恭喜你已经掌握虚拟 DOM 与 patch 的核心原理啦！这一篇我们反复提到「编译器会打上 PatchFlag、生成 Block」，下一篇我们就走进模板编译，看看模板是如何一步步变成带优化标记的 render 函数的。",[3446,3447,3448],"style",{},"html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}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 pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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 .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 .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}",{"title":1629,"searchDepth":1643,"depth":1643,"links":3450},[3451,3452,3453,3454,3455,3459,3460,3461,3462],{"id":1528,"depth":1643,"text":1529},{"id":1598,"depth":1643,"text":1599},{"id":1892,"depth":1643,"text":1893},{"id":2129,"depth":1643,"text":2130},{"id":2782,"depth":1643,"text":2783,"children":3456},[3457,3458],{"id":2804,"depth":1685,"text":2805},{"id":3001,"depth":1685,"text":3002},{"id":3115,"depth":1643,"text":3116},{"id":3160,"depth":1643,"text":3161},{"id":3201,"depth":1643,"text":3202},{"id":3261,"depth":1643,"text":3262},"理解 VNode 的结构与 patch 的主干流程，掌握 Vue3 借助 PatchFlag 和 Block 实现的定向更新机制。","md",null,{},{"title":1407},{"title":1521,"description":3463},"FNAF1fWgxs",[3471,3473],{"title":1446,"path":1447,"stem":1448,"description":3472,"children":-1},"理解 Vue3 调度器如何把多次数据修改合并成一次更新，掌握 queueJob、flushJobs 与 nextTick 的实现原理。",{"title":1411,"path":1453,"stem":1454,"description":3474,"children":-1},"理解 Vue3 模板编译的三段式流程，掌握 parse、transform、generate 各自做什么，以及 PatchFlag 与静态提升的优化思想。",1784715112644]