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MyButton)",[1545,1741,1570],{"class":1559},[1545,1743,1745,1748,1751,1753,1756,1760,1763,1766,1768,1770,1773,1775],{"class":1547,"line":1744},3,[1545,1746,1747],{"class":1559},"new",[1545,1749,1750],{"class":1563}," Vue",[1545,1752,1585],{"class":1555},[1545,1754,1755],{"class":1559},"{",[1545,1757,1759],{"class":1758},"sd2Uz"," el",[1545,1761,1762],{"class":1559},":",[1545,1764,1765],{"class":1559}," '",[1545,1767,1592],{"class":1591},[1545,1769,1588],{"class":1559},[1545,1771,1772],{"class":1559}," }",[1545,1774,1597],{"class":1555},[1545,1776,1570],{"class":1559},[1545,1778,1780],{"class":1547,"line":1779},4,[1545,1781,1783],{"emptyLinePlaceholder":1782},true,"\n",[1545,1785,1787],{"class":1547,"line":1786},5,[1545,1788,1789],{"class":1714},"// Vue3：注册在 app 上，应用之间互不影响\n",[1545,1791,1793,1795,1797,1799,1801,1803],{"class":1547,"line":1792},6,[1545,1794,1552],{"class":1551},[1545,1796,1556],{"class":1555},[1545,1798,1560],{"class":1559},[1545,1800,1564],{"class":1563},[1545,1802,1567],{"class":1555},[1545,1804,1570],{"class":1559},[1545,1806,1808,1810,1812,1814,1816,1818,1820,1822,1824,1826],{"class":1547,"line":1807},7,[1545,1809,1576],{"class":1555},[1545,1811,1579],{"class":1559},[1545,1813,1724],{"class":1563},[1545,1815,1585],{"class":1555},[1545,1817,1588],{"class":1559},[1545,1819,1731],{"class":1591},[1545,1821,1588],{"class":1559},[1545,1823,1736],{"class":1559},[1545,1825,1739],{"class":1555},[1545,1827,1570],{"class":1559},[1545,1829,1831,1833,1835,1837,1839,1841,1843,1845,1847],{"class":1547,"line":1830},8,[1545,1832,1576],{"class":1555},[1545,1834,1579],{"class":1559},[1545,1836,1582],{"class":1563},[1545,1838,1585],{"class":1555},[1545,1840,1588],{"class":1559},[1545,1842,1592],{"class":1591},[1545,1844,1588],{"class":1559},[1545,1846,1597],{"class":1555},[1545,1848,1570],{"class":1559},[1531,1850,1851,1852,1854,1855,1857,1858,1860,1861,1863,1864,1867,1868,1871,1872,1875,1876,1879],{},"那么 ",[1542,1853,1605],{}," 是怎么造出这个 ",[1542,1856,1576],{}," 的？打开 ",[1542,1859,1650],{},"，你会发现 ",[1542,1862,1605],{}," 并不是直接定义的，而是",[1644,1865,1866],{},"由一个 renderer 提供","的。",[1542,1869,1870],{},"renderer","（渲染器）是个新词，先用人话解释一下：",[1644,1873,1874],{},"渲染器就是「负责把组件画到屏幕上」的一套工具","，调用 ",[1542,1877,1878],{},"createRenderer"," 就能得到它。为什么要这样做，下一节专门讲。",[1535,1881,1883],{"className":1537,"code":1882,"language":1539,"meta":1540,"style":1540},"// 简化自 packages/runtime-dom/src/index.ts\nimport { nodeOps } from './nodeOps'; // 浏览器平台的 DOM 操作集合\nimport { patchProp } from './patchProp'; // 设置元素属性（class、事件等）的工具\n\n// 第一步：用 DOM 平台的操作方法，创建一个渲染器\nconst renderer = createRenderer({ ...nodeOps, patchProp });\n\n// 第二步：你调用的 createApp，其实是渲染器提供的\nexport const createApp = (...args) => {\n    const app = renderer.createApp(...args);\n\n    // 给 mount 包一层，让它支持传选择器字符串（如 '#app'）\n    const { mount } = app; // 先拿出渲染器给的原始 mount\n    app.mount = (containerOrSelector) => {\n        // 把字符串 '#app' 转成真实的 DOM 元素\n        const container = normalizeContainer(containerOrSelector);\n        return mount(container); // 再交给原始 mount 干活\n    };\n\n    return app;\n};\n",[1542,1884,1885,1890,1920,1945,1949,1954,1988,1992,1997,2026,2056,2061,2067,2088,2112,2118,2140,2160,2166,2171,2181],{"__ignoreMap":1540},[1545,1886,1887],{"class":1547,"line":1548},[1545,1888,1889],{"class":1714},"// 简化自 packages/runtime-dom/src/index.ts\n",[1545,1891,1892,1896,1899,1902,1904,1907,1909,1912,1914,1917],{"class":1547,"line":1573},[1545,1893,1895],{"class":1894},"s8pZq","import",[1545,1897,1898],{"class":1559}," {",[1545,1900,1901],{"class":1555}," nodeOps",[1545,1903,1772],{"class":1559},[1545,1905,1906],{"class":1894}," from",[1545,1908,1765],{"class":1559},[1545,1910,1911],{"class":1591},"./nodeOps",[1545,1913,1588],{"class":1559},[1545,1915,1916],{"class":1559},";",[1545,1918,1919],{"class":1714}," // 浏览器平台的 DOM 操作集合\n",[1545,1921,1922,1924,1926,1929,1931,1933,1935,1938,1940,1942],{"class":1547,"line":1744},[1545,1923,1895],{"class":1894},[1545,1925,1898],{"class":1559},[1545,1927,1928],{"class":1555}," patchProp",[1545,1930,1772],{"class":1559},[1545,1932,1906],{"class":1894},[1545,1934,1765],{"class":1559},[1545,1936,1937],{"class":1591},"./patchProp",[1545,1939,1588],{"class":1559},[1545,1941,1916],{"class":1559},[1545,1943,1944],{"class":1714}," // 设置元素属性（class、事件等）的工具\n",[1545,1946,1947],{"class":1547,"line":1779},[1545,1948,1783],{"emptyLinePlaceholder":1782},[1545,1950,1951],{"class":1547,"line":1786},[1545,1952,1953],{"class":1714},"// 第一步：用 DOM 平台的操作方法，创建一个渲染器\n",[1545,1955,1956,1958,1961,1963,1966,1968,1970,1973,1976,1978,1981,1984,1986],{"class":1547,"line":1792},[1545,1957,1552],{"class":1551},[1545,1959,1960],{"class":1555}," renderer ",[1545,1962,1560],{"class":1559},[1545,1964,1965],{"class":1563}," createRenderer",[1545,1967,1585],{"class":1555},[1545,1969,1755],{"class":1559},[1545,1971,1972],{"class":1559}," ...",[1545,1974,1975],{"class":1555},"nodeOps",[1545,1977,1736],{"class":1559},[1545,1979,1980],{"class":1555}," patchProp ",[1545,1982,1983],{"class":1559},"}",[1545,1985,1597],{"class":1555},[1545,1987,1570],{"class":1559},[1545,1989,1990],{"class":1547,"line":1807},[1545,1991,1783],{"emptyLinePlaceholder":1782},[1545,1993,1994],{"class":1547,"line":1830},[1545,1995,1996],{"class":1714},"// 第二步：你调用的 createApp，其实是渲染器提供的\n",[1545,1998,2000,2003,2006,2009,2011,2014,2018,2020,2023],{"class":1547,"line":1999},9,[1545,2001,2002],{"class":1894},"export",[1545,2004,2005],{"class":1551}," const",[1545,2007,2008],{"class":1555}," createApp ",[1545,2010,1560],{"class":1559},[1545,2012,2013],{"class":1559}," (...",[1545,2015,2017],{"class":2016},"sK9QF","args",[1545,2019,1597],{"class":1559},[1545,2021,2022],{"class":1551}," =>",[1545,2024,2025],{"class":1559}," {\n",[1545,2027,2029,2032,2035,2038,2041,2043,2045,2047,2050,2052,2054],{"class":1547,"line":2028},10,[1545,2030,2031],{"class":1551},"    const",[1545,2033,2034],{"class":1555}," app",[1545,2036,2037],{"class":1559}," =",[1545,2039,2040],{"class":1555}," renderer",[1545,2042,1579],{"class":1559},[1545,2044,1605],{"class":1563},[1545,2046,1585],{"class":1758},[1545,2048,2049],{"class":1559},"...",[1545,2051,2017],{"class":1555},[1545,2053,1597],{"class":1758},[1545,2055,1570],{"class":1559},[1545,2057,2059],{"class":1547,"line":2058},11,[1545,2060,1783],{"emptyLinePlaceholder":1782},[1545,2062,2064],{"class":1547,"line":2063},12,[1545,2065,2066],{"class":1714},"    // 给 mount 包一层，让它支持传选择器字符串（如 '#app'）\n",[1545,2068,2070,2072,2074,2077,2079,2081,2083,2085],{"class":1547,"line":2069},13,[1545,2071,2031],{"class":1551},[1545,2073,1898],{"class":1559},[1545,2075,2076],{"class":1555}," mount",[1545,2078,1772],{"class":1559},[1545,2080,2037],{"class":1559},[1545,2082,2034],{"class":1555},[1545,2084,1916],{"class":1559},[1545,2086,2087],{"class":1714}," // 先拿出渲染器给的原始 mount\n",[1545,2089,2091,2094,2096,2098,2100,2103,2106,2108,2110],{"class":1547,"line":2090},14,[1545,2092,2093],{"class":1555},"    app",[1545,2095,1579],{"class":1559},[1545,2097,1582],{"class":1563},[1545,2099,2037],{"class":1559},[1545,2101,2102],{"class":1559}," (",[1545,2104,2105],{"class":2016},"containerOrSelector",[1545,2107,1597],{"class":1559},[1545,2109,2022],{"class":1551},[1545,2111,2025],{"class":1559},[1545,2113,2115],{"class":1547,"line":2114},15,[1545,2116,2117],{"class":1714},"        // 把字符串 '#app' 转成真实的 DOM 元素\n",[1545,2119,2121,2124,2127,2129,2132,2134,2136,2138],{"class":1547,"line":2120},16,[1545,2122,2123],{"class":1551},"        const",[1545,2125,2126],{"class":1555}," container",[1545,2128,2037],{"class":1559},[1545,2130,2131],{"class":1563}," normalizeContainer",[1545,2133,1585],{"class":1758},[1545,2135,2105],{"class":1555},[1545,2137,1597],{"class":1758},[1545,2139,1570],{"class":1559},[1545,2141,2143,2146,2148,2150,2153,2155,2157],{"class":1547,"line":2142},17,[1545,2144,2145],{"class":1894},"        return",[1545,2147,2076],{"class":1563},[1545,2149,1585],{"class":1758},[1545,2151,2152],{"class":1555},"container",[1545,2154,1597],{"class":1758},[1545,2156,1916],{"class":1559},[1545,2158,2159],{"class":1714}," // 再交给原始 mount 干活\n",[1545,2161,2163],{"class":1547,"line":2162},18,[1545,2164,2165],{"class":1559},"    };\n",[1545,2167,2169],{"class":1547,"line":2168},19,[1545,2170,1783],{"emptyLinePlaceholder":1782},[1545,2172,2174,2177,2179],{"class":1547,"line":2173},20,[1545,2175,2176],{"class":1894},"    return",[1545,2178,2034],{"class":1555},[1545,2180,1570],{"class":1559},[1545,2182,2184],{"class":1547,"line":2183},21,[1545,2185,2186],{"class":1559},"};\n",[1531,2188,2189,2190,2193,2194,2196,2197,2199],{},"继续往里追，",[1542,2191,2192],{},"renderer.createApp"," 来自 ",[1542,2195,1654],{},"。真正的 ",[1542,2198,1576],{}," 对象在这里诞生：",[1535,2201,2203],{"className":1537,"code":2202,"language":1539,"meta":1540,"style":1540},"// 简化自 packages/runtime-core/src/apiCreateApp.ts\nexport function createAppAPI(render) {\n    // 你调用的 createApp(App)，就是调用这个函数\n    return function createApp(rootComponent, rootProps = null) {\n        const app = {\n            _component: rootComponent, // 根组件（你传进来的 App）\n            _props: rootProps, // 传给根组件的 props\n            _container: null, // 挂载容器，mount 时才赋值\n\n            config: {}, // 全局配置（如错误处理）\n            provides: {}, // 全局 provide 的数据\n\n            use(plugin) {\n                /* 安装插件，如 router */\n            },\n            mixin(mixin) {\n                /* 全局混入 */\n            },\n            component(name, component) {\n                /* 注册全局组件 */\n            },\n            mount(rootContainer) {\n                /* 挂载，下一节细讲 */\n            },\n            unmount() {\n                /* 卸载应用 */\n            },\n        };\n\n        return app;\n    };\n}\n",[1542,2204,2205,2210,2229,2234,2259,2269,2284,2298,2311,2315,2328,2340,2344,2358,2363,2368,2382,2387,2391,2410,2415,2419,2434,2440,2445,2456,2462,2467,2473,2478,2487,2492],{"__ignoreMap":1540},[1545,2206,2207],{"class":1547,"line":1548},[1545,2208,2209],{"class":1714},"// 简化自 packages/runtime-core/src/apiCreateApp.ts\n",[1545,2211,2212,2214,2217,2220,2222,2225,2227],{"class":1547,"line":1573},[1545,2213,2002],{"class":1894},[1545,2215,2216],{"class":1551}," function",[1545,2218,2219],{"class":1563}," createAppAPI",[1545,2221,1585],{"class":1559},[1545,2223,2224],{"class":2016},"render",[1545,2226,1597],{"class":1559},[1545,2228,2025],{"class":1559},[1545,2230,2231],{"class":1547,"line":1744},[1545,2232,2233],{"class":1714},"    // 你调用的 createApp(App)，就是调用这个函数\n",[1545,2235,2236,2238,2240,2242,2244,2247,2249,2252,2254,2257],{"class":1547,"line":1779},[1545,2237,2176],{"class":1894},[1545,2239,2216],{"class":1551},[1545,2241,1564],{"class":1563},[1545,2243,1585],{"class":1559},[1545,2245,2246],{"class":2016},"rootComponent",[1545,2248,1736],{"class":1559},[1545,2250,2251],{"class":2016}," rootProps",[1545,2253,2037],{"class":1559},[1545,2255,2256],{"class":1559}," null)",[1545,2258,2025],{"class":1559},[1545,2260,2261,2263,2265,2267],{"class":1547,"line":1786},[1545,2262,2123],{"class":1551},[1545,2264,2034],{"class":1555},[1545,2266,2037],{"class":1559},[1545,2268,2025],{"class":1559},[1545,2270,2271,2274,2276,2279,2281],{"class":1547,"line":1792},[1545,2272,2273],{"class":1758},"            _component",[1545,2275,1762],{"class":1559},[1545,2277,2278],{"class":1555}," rootComponent",[1545,2280,1736],{"class":1559},[1545,2282,2283],{"class":1714}," // 根组件（你传进来的 App）\n",[1545,2285,2286,2289,2291,2293,2295],{"class":1547,"line":1807},[1545,2287,2288],{"class":1758},"            _props",[1545,2290,1762],{"class":1559},[1545,2292,2251],{"class":1555},[1545,2294,1736],{"class":1559},[1545,2296,2297],{"class":1714}," // 传给根组件的 props\n",[1545,2299,2300,2303,2305,2308],{"class":1547,"line":1830},[1545,2301,2302],{"class":1758},"            _container",[1545,2304,1762],{"class":1559},[1545,2306,2307],{"class":1559}," null,",[1545,2309,2310],{"class":1714}," // 挂载容器，mount 时才赋值\n",[1545,2312,2313],{"class":1547,"line":1999},[1545,2314,1783],{"emptyLinePlaceholder":1782},[1545,2316,2317,2320,2322,2325],{"class":1547,"line":2028},[1545,2318,2319],{"class":1758},"            config",[1545,2321,1762],{"class":1559},[1545,2323,2324],{"class":1559}," {},",[1545,2326,2327],{"class":1714}," // 全局配置（如错误处理）\n",[1545,2329,2330,2333,2335,2337],{"class":1547,"line":2058},[1545,2331,2332],{"class":1758},"            provides",[1545,2334,1762],{"class":1559},[1545,2336,2324],{"class":1559},[1545,2338,2339],{"class":1714}," // 全局 provide 的数据\n",[1545,2341,2342],{"class":1547,"line":2063},[1545,2343,1783],{"emptyLinePlaceholder":1782},[1545,2345,2346,2349,2351,2354,2356],{"class":1547,"line":2069},[1545,2347,2348],{"class":1758},"            use",[1545,2350,1585],{"class":1559},[1545,2352,2353],{"class":2016},"plugin",[1545,2355,1597],{"class":1559},[1545,2357,2025],{"class":1559},[1545,2359,2360],{"class":1547,"line":2090},[1545,2361,2362],{"class":1714},"                /* 安装插件，如 router */\n",[1545,2364,2365],{"class":1547,"line":2114},[1545,2366,2367],{"class":1559},"            },\n",[1545,2369,2370,2373,2375,2378,2380],{"class":1547,"line":2120},[1545,2371,2372],{"class":1758},"            mixin",[1545,2374,1585],{"class":1559},[1545,2376,2377],{"class":2016},"mixin",[1545,2379,1597],{"class":1559},[1545,2381,2025],{"class":1559},[1545,2383,2384],{"class":1547,"line":2142},[1545,2385,2386],{"class":1714},"                /* 全局混入 */\n",[1545,2388,2389],{"class":1547,"line":2162},[1545,2390,2367],{"class":1559},[1545,2392,2393,2396,2398,2401,2403,2406,2408],{"class":1547,"line":2168},[1545,2394,2395],{"class":1758},"            component",[1545,2397,1585],{"class":1559},[1545,2399,2400],{"class":2016},"name",[1545,2402,1736],{"class":1559},[1545,2404,2405],{"class":2016}," component",[1545,2407,1597],{"class":1559},[1545,2409,2025],{"class":1559},[1545,2411,2412],{"class":1547,"line":2173},[1545,2413,2414],{"class":1714},"                /* 注册全局组件 */\n",[1545,2416,2417],{"class":1547,"line":2183},[1545,2418,2367],{"class":1559},[1545,2420,2422,2425,2427,2430,2432],{"class":1547,"line":2421},22,[1545,2423,2424],{"class":1758},"            mount",[1545,2426,1585],{"class":1559},[1545,2428,2429],{"class":2016},"rootContainer",[1545,2431,1597],{"class":1559},[1545,2433,2025],{"class":1559},[1545,2435,2437],{"class":1547,"line":2436},23,[1545,2438,2439],{"class":1714},"                /* 挂载，下一节细讲 */\n",[1545,2441,2443],{"class":1547,"line":2442},24,[1545,2444,2367],{"class":1559},[1545,2446,2448,2451,2454],{"class":1547,"line":2447},25,[1545,2449,2450],{"class":1758},"            unmount",[1545,2452,2453],{"class":1559},"()",[1545,2455,2025],{"class":1559},[1545,2457,2459],{"class":1547,"line":2458},26,[1545,2460,2461],{"class":1714},"                /* 卸载应用 */\n",[1545,2463,2465],{"class":1547,"line":2464},27,[1545,2466,2367],{"class":1559},[1545,2468,2470],{"class":1547,"line":2469},28,[1545,2471,2472],{"class":1559},"        };\n",[1545,2474,2476],{"class":1547,"line":2475},29,[1545,2477,1783],{"emptyLinePlaceholder":1782},[1545,2479,2481,2483,2485],{"class":1547,"line":2480},30,[1545,2482,2145],{"class":1894},[1545,2484,2034],{"class":1555},[1545,2486,1570],{"class":1559},[1545,2488,2490],{"class":1547,"line":2489},31,[1545,2491,2165],{"class":1559},[1545,2493,2495],{"class":1547,"line":2494},32,[1545,2496,2497],{"class":1559},"}\n",[1531,2499,2500,2501,2506,2507,1683,2510,1683,2512,1683,2514,2516,2517,1683,2520,2523],{},"看清楚了：",[1644,2502,2503,2505],{},[1542,2504,1576],{}," 就是一个普通对象","，身上挂着 ",[1542,2508,2509],{},"use",[1542,2511,2377],{},[1542,2513,1724],{},[1542,2515,1582],{}," 等方法，外加 ",[1542,2518,2519],{},"_component",[1542,2521,2522],{},"_container"," 这些内部字段。你平时用的每一个 API，都只是这个对象上的一个函数，没有任何魔法。",[2525,2526,2527],"tip",{},[1531,2528,2529,2531,2532,2534,2535,2538],{},[1542,2530,1576],{}," 上的方法大多返回 ",[1542,2533,1576],{}," 自身，所以 ",[1542,2536,2537],{},"createApp(App).use(router).mount('#app')"," 这种链式写法是合法的。",[1657,2540],{},[1526,2542,2544],{"id":2543},"createrenderer-与跨平台设计","🧱 createRenderer 与跨平台设计",[1531,2546,2547,2548,2550,2551,2553,2554,2557,2558,2561,2562,2564,2565,2567],{},"上一节留了个疑问：为什么 ",[1542,2549,1605],{}," 要绕一道，从 ",[1542,2552,1878],{}," 生成的渲染器上拿？这一节就来回答它。先讲结论：",[1644,2555,2556],{},"Vue3 把「画组件的通用逻辑」和「具体的 DOM 操作」分开了","。通用逻辑放在 ",[1542,2559,2560],{},"runtime-core"," 里，里面一行 ",[1542,2563,7],{}," 相关的代码都没有；而「怎么创建元素、设置属性、插入节点」这些具体操作，由运行平台自己提供，通过参数传给 ",[1542,2566,1878],{},"。",[1531,2569,2570,2571,2573,2574,2576],{},"具体来说：",[1542,2572,2560],{}," 只负责通用逻辑，比如组件怎么创建、状态变了怎么更新；而「创建元素、设置属性、插入节点」这些具体操作，全部由运行平台提供。浏览器平台提供的这套操作就是 ",[1542,2575,1975],{},"：",[1535,2578,2580],{"className":1537,"code":2579,"language":1539,"meta":1540,"style":1540},"// 简化自 packages/runtime-dom/src/nodeOps.ts\nexport const nodeOps = {\n    // 插入一个节点\n    insert: (child, parent, anchor) => {\n        parent.insertBefore(child, anchor || null);\n    },\n    // 删除一个节点\n    remove: (child) => {\n        const parent = child.parentNode;\n        if (parent) parent.removeChild(child);\n    },\n    // 创建元素、创建文本节点\n    createElement: (tag) => document.createElement(tag),\n    createText: (text) => document.createTextNode(text),\n    // ... 还有 querySelector 等，了解即可\n};\n",[1542,2581,2582,2587,2600,2605,2633,2661,2666,2671,2688,2706,2734,2738,2743,2773,2801,2806],{"__ignoreMap":1540},[1545,2583,2584],{"class":1547,"line":1548},[1545,2585,2586],{"class":1714},"// 简化自 packages/runtime-dom/src/nodeOps.ts\n",[1545,2588,2589,2591,2593,2596,2598],{"class":1547,"line":1573},[1545,2590,2002],{"class":1894},[1545,2592,2005],{"class":1551},[1545,2594,2595],{"class":1555}," nodeOps ",[1545,2597,1560],{"class":1559},[1545,2599,2025],{"class":1559},[1545,2601,2602],{"class":1547,"line":1744},[1545,2603,2604],{"class":1714},"    // 插入一个节点\n",[1545,2606,2607,2610,2612,2614,2617,2619,2622,2624,2627,2629,2631],{"class":1547,"line":1779},[1545,2608,2609],{"class":1563},"    insert",[1545,2611,1762],{"class":1559},[1545,2613,2102],{"class":1559},[1545,2615,2616],{"class":2016},"child",[1545,2618,1736],{"class":1559},[1545,2620,2621],{"class":2016}," parent",[1545,2623,1736],{"class":1559},[1545,2625,2626],{"class":2016}," anchor",[1545,2628,1597],{"class":1559},[1545,2630,2022],{"class":1551},[1545,2632,2025],{"class":1559},[1545,2634,2635,2638,2640,2643,2645,2647,2649,2651,2654,2657,2659],{"class":1547,"line":1786},[1545,2636,2637],{"class":1555},"        parent",[1545,2639,1579],{"class":1559},[1545,2641,2642],{"class":1563},"insertBefore",[1545,2644,1585],{"class":1758},[1545,2646,2616],{"class":1555},[1545,2648,1736],{"class":1559},[1545,2650,2626],{"class":1555},[1545,2652,2653],{"class":1559}," ||",[1545,2655,2656],{"class":1559}," null",[1545,2658,1597],{"class":1758},[1545,2660,1570],{"class":1559},[1545,2662,2663],{"class":1547,"line":1792},[1545,2664,2665],{"class":1559},"    },\n",[1545,2667,2668],{"class":1547,"line":1807},[1545,2669,2670],{"class":1714},"    // 删除一个节点\n",[1545,2672,2673,2676,2678,2680,2682,2684,2686],{"class":1547,"line":1830},[1545,2674,2675],{"class":1563},"    remove",[1545,2677,1762],{"class":1559},[1545,2679,2102],{"class":1559},[1545,2681,2616],{"class":2016},[1545,2683,1597],{"class":1559},[1545,2685,2022],{"class":1551},[1545,2687,2025],{"class":1559},[1545,2689,2690,2692,2694,2696,2699,2701,2704],{"class":1547,"line":1999},[1545,2691,2123],{"class":1551},[1545,2693,2621],{"class":1555},[1545,2695,2037],{"class":1559},[1545,2697,2698],{"class":1555}," child",[1545,2700,1579],{"class":1559},[1545,2702,2703],{"class":1555},"parentNode",[1545,2705,1570],{"class":1559},[1545,2707,2708,2711,2713,2716,2719,2721,2723,2726,2728,2730,2732],{"class":1547,"line":2028},[1545,2709,2710],{"class":1894},"        if",[1545,2712,2102],{"class":1758},[1545,2714,2715],{"class":1555},"parent",[1545,2717,2718],{"class":1758},") ",[1545,2720,2715],{"class":1555},[1545,2722,1579],{"class":1559},[1545,2724,2725],{"class":1563},"removeChild",[1545,2727,1585],{"class":1758},[1545,2729,2616],{"class":1555},[1545,2731,1597],{"class":1758},[1545,2733,1570],{"class":1559},[1545,2735,2736],{"class":1547,"line":2058},[1545,2737,2665],{"class":1559},[1545,2739,2740],{"class":1547,"line":2063},[1545,2741,2742],{"class":1714},"    // 创建元素、创建文本节点\n",[1545,2744,2745,2748,2750,2752,2755,2757,2759,2762,2764,2767,2770],{"class":1547,"line":2069},[1545,2746,2747],{"class":1563},"    createElement",[1545,2749,1762],{"class":1559},[1545,2751,2102],{"class":1559},[1545,2753,2754],{"class":2016},"tag",[1545,2756,1597],{"class":1559},[1545,2758,2022],{"class":1551},[1545,2760,2761],{"class":1555}," document",[1545,2763,1579],{"class":1559},[1545,2765,2766],{"class":1563},"createElement",[1545,2768,2769],{"class":1555},"(tag)",[1545,2771,2772],{"class":1559},",\n",[1545,2774,2775,2778,2780,2782,2785,2787,2789,2791,2793,2796,2799],{"class":1547,"line":2090},[1545,2776,2777],{"class":1563},"    createText",[1545,2779,1762],{"class":1559},[1545,2781,2102],{"class":1559},[1545,2783,2784],{"class":2016},"text",[1545,2786,1597],{"class":1559},[1545,2788,2022],{"class":1551},[1545,2790,2761],{"class":1555},[1545,2792,1579],{"class":1559},[1545,2794,2795],{"class":1563},"createTextNode",[1545,2797,2798],{"class":1555},"(text)",[1545,2800,2772],{"class":1559},[1545,2802,2803],{"class":1547,"line":2114},[1545,2804,2805],{"class":1714},"    // ... 还有 querySelector 等，了解即可\n",[1545,2807,2808],{"class":1547,"line":2120},[1545,2809,2186],{"class":1559},[1531,2811,2812,2813,2815,2816,2819],{},"可以看到，",[1542,2814,1975],{}," 里就是我们熟悉的原生 DOM API。",[1542,2817,2818],{},"createRenderer({ ...nodeOps, patchProp })"," 就是把这套浏览器操作注入进去，生成的渲染器就知道怎么在浏览器里干活了。同一套核心代码，换一套平台操作就能换个环境运行：",[1617,2821,2822,2830],{},[1620,2823,2824,2826,2827,2829],{},[1644,2825,186],{},"：注入 ",[1542,2828,1975],{},"，就是你现在用的 Vue。",[1620,2831,2832,2835],{},[1644,2833,2834],{},"小程序 / 终端 / Canvas","：换一套平台操作注入进去，核心逻辑一行不改。社区里一些把 Vue 渲染到小程序或终端的方案，走的就是这条路。",[2525,2837,2838],{},[1531,2839,2840,2841,1683,2844,2847,2848,2851,2852,2854],{},"读源码时看到 ",[1542,2842,2843],{},"hostInsert",[1542,2845,2846],{},"hostCreateElement"," 这类带 ",[1542,2849,2850],{},"host"," 前缀的函数，它就是「平台注入的 DOM 操作」的别名，具体实现回到 ",[1542,2853,1975],{}," 里看即可。",[1657,2856],{},[1526,2858,2860],{"id":2859},"appmount-的执行流程","🧱 app.mount 的执行流程",[1531,2862,2863,2864,2866,2867,2870],{},"前面两节把 ",[1542,2865,1576],{}," 的来历讲清楚了，现在进入本篇的主线：",[1542,2868,2869],{},"app.mount('#app')"," 调用时，到底发生了什么？这里会出现两个新词，先解释清楚：",[1617,2872,2873,2887],{},[1620,2874,2875,2878,2879,2882,2883,2886],{},[1644,2876,2877],{},"vnode（虚拟节点）","：一个普通 JS 对象，用来「描述」一个界面元素长什么样，比如「这是一个 ",[1542,2880,2881],{},"div","，里面有一句文字」。它只是一份",[1644,2884,2885],{},"渲染说明书","，还不是真实的 DOM。",[1620,2888,2889,2892],{},[1644,2890,2891],{},"patch","：拿着 vnode 这份说明书，去创建或更新真实 DOM 的过程。名字来自「打补丁」，首次渲染是整块铺上去，更新时是哪里变了补哪里。",[1531,2894,2895,2896,2898],{},"理解了这两个词，看简化后的 ",[1542,2897,1582],{}," 就很顺了：",[1535,2900,2902],{"className":1537,"code":2901,"language":1539,"meta":1540,"style":1540},"// 简化自 packages/runtime-core/src/apiCreateApp.ts 的 mount\nmount(rootContainer) {\n    // 1. 用根组件生成一份「渲染说明书」（vnode）\n    const vnode = createVNode(rootComponent, rootProps);\n\n    // 2. 把 app 的上下文挂到 vnode 上，组件里的 provide/inject 靠它工作\n    vnode.appContext = app._context;\n\n    // 3. 调用 render 进入 patch，把说明书变成真实 DOM\n    render(vnode, rootContainer);\n\n    // 4. 记录容器，并在容器上打个标记，表示「这里已经挂载过了」\n    app._container = rootContainer;\n    rootContainer.__vue_app__ = app;\n\n    // 5. 返回根组件实例的代理对象（下面解释）\n    return vnode.component.proxy;\n}\n",[1542,2903,2904,2909,2919,2924,2948,2952,2957,2978,2982,2987,3006,3010,3015,3029,3045,3049,3054,3071],{"__ignoreMap":1540},[1545,2905,2906],{"class":1547,"line":1548},[1545,2907,2908],{"class":1714},"// 简化自 packages/runtime-core/src/apiCreateApp.ts 的 mount\n",[1545,2910,2911,2913,2916],{"class":1547,"line":1573},[1545,2912,1582],{"class":1563},[1545,2914,2915],{"class":1555},"(rootContainer) ",[1545,2917,2918],{"class":1559},"{\n",[1545,2920,2921],{"class":1547,"line":1744},[1545,2922,2923],{"class":1714},"    // 1. 用根组件生成一份「渲染说明书」（vnode）\n",[1545,2925,2926,2928,2931,2933,2936,2938,2940,2942,2944,2946],{"class":1547,"line":1779},[1545,2927,2031],{"class":1551},[1545,2929,2930],{"class":1555}," vnode",[1545,2932,2037],{"class":1559},[1545,2934,2935],{"class":1563}," createVNode",[1545,2937,1585],{"class":1758},[1545,2939,2246],{"class":1555},[1545,2941,1736],{"class":1559},[1545,2943,2251],{"class":1555},[1545,2945,1597],{"class":1758},[1545,2947,1570],{"class":1559},[1545,2949,2950],{"class":1547,"line":1786},[1545,2951,1783],{"emptyLinePlaceholder":1782},[1545,2953,2954],{"class":1547,"line":1792},[1545,2955,2956],{"class":1714},"    // 2. 把 app 的上下文挂到 vnode 上，组件里的 provide/inject 靠它工作\n",[1545,2958,2959,2962,2964,2967,2969,2971,2973,2976],{"class":1547,"line":1807},[1545,2960,2961],{"class":1555},"    vnode",[1545,2963,1579],{"class":1559},[1545,2965,2966],{"class":1555},"appContext",[1545,2968,2037],{"class":1559},[1545,2970,2034],{"class":1555},[1545,2972,1579],{"class":1559},[1545,2974,2975],{"class":1555},"_context",[1545,2977,1570],{"class":1559},[1545,2979,2980],{"class":1547,"line":1830},[1545,2981,1783],{"emptyLinePlaceholder":1782},[1545,2983,2984],{"class":1547,"line":1999},[1545,2985,2986],{"class":1714},"    // 3. 调用 render 进入 patch，把说明书变成真实 DOM\n",[1545,2988,2989,2992,2994,2997,2999,3002,3004],{"class":1547,"line":2028},[1545,2990,2991],{"class":1563},"    render",[1545,2993,1585],{"class":1758},[1545,2995,2996],{"class":1555},"vnode",[1545,2998,1736],{"class":1559},[1545,3000,3001],{"class":1555}," rootContainer",[1545,3003,1597],{"class":1758},[1545,3005,1570],{"class":1559},[1545,3007,3008],{"class":1547,"line":2058},[1545,3009,1783],{"emptyLinePlaceholder":1782},[1545,3011,3012],{"class":1547,"line":2063},[1545,3013,3014],{"class":1714},"    // 4. 记录容器，并在容器上打个标记，表示「这里已经挂载过了」\n",[1545,3016,3017,3019,3021,3023,3025,3027],{"class":1547,"line":2069},[1545,3018,2093],{"class":1555},[1545,3020,1579],{"class":1559},[1545,3022,2522],{"class":1555},[1545,3024,2037],{"class":1559},[1545,3026,3001],{"class":1555},[1545,3028,1570],{"class":1559},[1545,3030,3031,3034,3036,3039,3041,3043],{"class":1547,"line":2090},[1545,3032,3033],{"class":1555},"    rootContainer",[1545,3035,1579],{"class":1559},[1545,3037,3038],{"class":1555},"__vue_app__",[1545,3040,2037],{"class":1559},[1545,3042,2034],{"class":1555},[1545,3044,1570],{"class":1559},[1545,3046,3047],{"class":1547,"line":2114},[1545,3048,1783],{"emptyLinePlaceholder":1782},[1545,3050,3051],{"class":1547,"line":2120},[1545,3052,3053],{"class":1714},"    // 5. 返回根组件实例的代理对象（下面解释）\n",[1545,3055,3056,3058,3060,3062,3064,3066,3069],{"class":1547,"line":2142},[1545,3057,2176],{"class":1894},[1545,3059,2930],{"class":1555},[1545,3061,1579],{"class":1559},[1545,3063,1724],{"class":1555},[1545,3065,1579],{"class":1559},[1545,3067,3068],{"class":1555},"proxy",[1545,3070,1570],{"class":1559},[1545,3072,3073],{"class":1547,"line":2162},[1545,3074,2497],{"class":1559},[1531,3076,3077],{},"按步骤拆解：",[3079,3080,3081,3090,3104,3112,3121],"ol",{},[1620,3082,3083,2576,3086,3089],{},[1644,3084,3085],{},"创建 vnode",[1542,3087,3088],{},"createVNode"," 把根组件包装成一个 vnode。此时还没有任何 DOM 操作，只是生成了说明书。vnode 的细节第 7 篇会展开。",[1620,3091,3092,3095,3096,3099,3100,3103],{},[1644,3093,3094],{},"绑定应用上下文","：上下文就是「这个应用的全局信息包」，里面有全局组件、全局配置和 ",[1542,3097,3098],{},"provides","。挂上它，组件树里的 ",[1542,3101,3102],{},"provide/inject"," 才能跨层级工作。",[1620,3105,3106,2576,3109,3111],{},[1644,3107,3108],{},"进入渲染",[1542,3110,2224],{}," 是渲染器的核心入口，内部会走 patch 流程，把 vnode 变成真实 DOM 塞进容器。",[1620,3113,3114,3117,3118,3120],{},[1644,3115,3116],{},"打标记","：容器节点上挂 ",[1542,3119,3038],{},"，Vue DevTools 靠它找到页面上的应用，它也能防止你在同一个容器上重复挂载。",[1620,3122,3123,2576,3126,3128,3129,3131,3132,2567,3134,3137,3138,3141,3142,3145],{},[1644,3124,3125],{},"返回代理对象",[1542,3127,1582],{}," 的返回值不是 ",[1542,3130,1576],{},"，而是根组件实例的 ",[1542,3133,3068],{},[1644,3135,3136],{},"代理（proxy）是组件实例的访问入口","：你通过它读写组件的数据和方法，它在背后把操作转发到真正的实例上。你在 Options API 里用的 ",[1542,3139,3140],{},"this","，以及通过 ",[1542,3143,3144],{},"vm.xxx"," 访问数据，走的就是它。",[3147,3148,3149],"warning",{},[1531,3150,3151,3152,3154,3155,3157,3158,3160,3161,3163],{},"一个常见的困惑：",[1542,3153,2869],{}," 返回的不是 ",[1542,3156,1576],{}," 本身，不能拿它继续链式调用 ",[1542,3159,2509],{},"。想链式调用，就把插件安装写在 ",[1542,3162,1582],{}," 之前。",[1657,3165],{},[1526,3167,3169],{"id":3168},"首次渲染做了什么","🧱 首次渲染做了什么",[1531,3171,3172,3173,3175],{},"上一节说到 ",[1542,3174,2224],{}," 内部会走 patch。首次渲染时容器是空的，没有旧 vnode，patch 就走「全新挂载」路线。那么遇到我们的组件 vnode 时，Vue 具体按什么顺序干活？这一节讲清楚。",[1535,3177,3179],{"className":1537,"code":3178,"language":1539,"meta":1540,"style":1540},"// 简化自 packages/runtime-core/src/renderer.ts 的组件挂载流程\nfunction mountComponent(vnode, container) {\n    // 1. 创建组件实例：一个用来存放这个组件所有信息的对象\n    const instance = createComponentInstance(vnode);\n    vnode.component = instance;\n\n    // 2. 执行你写的 setup()，拿到返回值（状态或渲染函数）\n    setupComponent(instance);\n\n    // 3. 建立渲染 effect，执行渲染函数，真实 DOM 在这里诞生\n    setupRenderEffect(instance, vnode, container);\n}\n",[1542,3180,3181,3186,3206,3211,3231,3245,3249,3254,3268,3272,3277,3298],{"__ignoreMap":1540},[1545,3182,3183],{"class":1547,"line":1548},[1545,3184,3185],{"class":1714},"// 简化自 packages/runtime-core/src/renderer.ts 的组件挂载流程\n",[1545,3187,3188,3191,3194,3196,3198,3200,3202,3204],{"class":1547,"line":1573},[1545,3189,3190],{"class":1551},"function",[1545,3192,3193],{"class":1563}," mountComponent",[1545,3195,1585],{"class":1559},[1545,3197,2996],{"class":2016},[1545,3199,1736],{"class":1559},[1545,3201,2126],{"class":2016},[1545,3203,1597],{"class":1559},[1545,3205,2025],{"class":1559},[1545,3207,3208],{"class":1547,"line":1744},[1545,3209,3210],{"class":1714},"    // 1. 创建组件实例：一个用来存放这个组件所有信息的对象\n",[1545,3212,3213,3215,3218,3220,3223,3225,3227,3229],{"class":1547,"line":1779},[1545,3214,2031],{"class":1551},[1545,3216,3217],{"class":1555}," instance",[1545,3219,2037],{"class":1559},[1545,3221,3222],{"class":1563}," createComponentInstance",[1545,3224,1585],{"class":1758},[1545,3226,2996],{"class":1555},[1545,3228,1597],{"class":1758},[1545,3230,1570],{"class":1559},[1545,3232,3233,3235,3237,3239,3241,3243],{"class":1547,"line":1786},[1545,3234,2961],{"class":1555},[1545,3236,1579],{"class":1559},[1545,3238,1724],{"class":1555},[1545,3240,2037],{"class":1559},[1545,3242,3217],{"class":1555},[1545,3244,1570],{"class":1559},[1545,3246,3247],{"class":1547,"line":1792},[1545,3248,1783],{"emptyLinePlaceholder":1782},[1545,3250,3251],{"class":1547,"line":1807},[1545,3252,3253],{"class":1714},"    // 2. 执行你写的 setup()，拿到返回值（状态或渲染函数）\n",[1545,3255,3256,3259,3261,3264,3266],{"class":1547,"line":1830},[1545,3257,3258],{"class":1563},"    setupComponent",[1545,3260,1585],{"class":1758},[1545,3262,3263],{"class":1555},"instance",[1545,3265,1597],{"class":1758},[1545,3267,1570],{"class":1559},[1545,3269,3270],{"class":1547,"line":1999},[1545,3271,1783],{"emptyLinePlaceholder":1782},[1545,3273,3274],{"class":1547,"line":2028},[1545,3275,3276],{"class":1714},"    // 3. 建立渲染 effect，执行渲染函数，真实 DOM 在这里诞生\n",[1545,3278,3279,3282,3284,3286,3288,3290,3292,3294,3296],{"class":1547,"line":2058},[1545,3280,3281],{"class":1563},"    setupRenderEffect",[1545,3283,1585],{"class":1758},[1545,3285,3263],{"class":1555},[1545,3287,1736],{"class":1559},[1545,3289,2930],{"class":1555},[1545,3291,1736],{"class":1559},[1545,3293,2126],{"class":1555},[1545,3295,1597],{"class":1758},[1545,3297,1570],{"class":1559},[1545,3299,3300],{"class":1547,"line":2063},[1545,3301,2497],{"class":1559},[1531,3303,3304],{},"三步各司其职：",[1617,3306,3307,3319,3329],{},[1620,3308,3309,2576,3312,3314,3315,3318],{},[1644,3310,3311],{},"创建实例",[1542,3313,3263],{},"（实例）就是一个普通的 JS 对象，用来存放这个组件的所有信息，之后 ",[1542,3316,3317],{},"setup"," 的结果、生命周期、渲染状态都挂在它身上。",[1620,3320,3321,3324,3325,3328],{},[1644,3322,3323],{},"执行 setup","：调用你写的 ",[1542,3326,3327],{},"setup()","，拿到返回值，供模板使用。",[1620,3330,3331,2576,3334,3337,3338,3341],{},[1644,3332,3333],{},"渲染 effect",[1542,3335,3336],{},"effect"," 可以通俗地理解为「",[1644,3339,3340],{},"一个会自动重新执行的函数","」。这里创建的渲染 effect 负责执行组件的渲染函数、递归 patch 子树，真实 DOM 被创建并插入容器。",[1531,3343,3344,3345,3348,3349,3352,3353,2567],{},"这里只讲主干。两个关键细节留给后面：",[1644,3346,3347],{},"effect 怎么和响应式数据建立联系、数据变化后怎么重新执行","，是第 4 篇的内容；",[1644,3350,3351],{},"patch 怎么对比和更新 vnode","，是第 7 篇的内容。现在你只需要记住首次渲染的出场顺序：",[1644,3354,3355],{},"实例 → setup → 渲染 effect → 真实 DOM 上屏",[2525,3357,3358],{},[1531,3359,3360,3361,1683,3364,1651,3367,3370],{},"在调试环境里验证：在 ",[1542,3362,3363],{},"createComponentInstance",[1542,3365,3366],{},"setupComponent",[1542,3368,3369],{},"setupRenderEffect"," 各打一个断点，刷新页面，你会看到它们按上面的顺序依次命中。",[1657,3372],{},[1526,3374,3376],{"id":3375},"与-vue2-初始化对比","⚡ 与 Vue2 初始化对比",[1531,3378,3379,3380,3384,3385,3388,3389,3392],{},"如果你在 ",[3381,3382,3383],"a",{"href":1386},"Vue2 源码课程","里跟过 ",[1542,3386,3387],{},"new Vue()"," 的 ",[1542,3390,3391],{},"_init"," 流程，可以对照这张表，快速抓住两个版本的差异：",[3394,3395,3396,3410],"table",{},[3397,3398,3399],"thead",{},[3400,3401,3402,3406,3408],"tr",{},[3403,3404,3405],"th",{},"维度",[3403,3407,559],{},[3403,3409,666],{},[3411,3412,3413,3431,3449,3466],"tbody",{},[3400,3414,3415,3419,3425],{},[3416,3417,3418],"td",{},"入口",[3416,3420,3421,3424],{},[1542,3422,3423],{},"new Vue(options)"," 构造函数",[3416,3426,3427,3430],{},[1542,3428,3429],{},"createApp(App)"," 返回应用实例",[3400,3432,3433,3436,3445],{},[3416,3434,3435],{},"挂载 API",[3416,3437,3438,3441,3442],{},[1542,3439,3440],{},"el"," 选项或 ",[1542,3443,3444],{},"$mount('#app')",[3416,3446,3447],{},[1542,3448,2869],{},[3400,3450,3451,3454,3460],{},[3416,3452,3453],{},"全局配置",[3416,3455,3456,3457,3459],{},"挂在全局构造函数上（",[1542,3458,1686],{}," 等）",[3416,3461,3462,3463,3465],{},"挂在 app 上（",[1542,3464,1703],{}," 等），应用间隔离",[3400,3467,3468,3471,3474],{},[3416,3469,3470],{},"平台耦合",[3416,3472,3473],{},"核心代码与 web 平台耦合在单一仓库里",[3416,3475,3476,3478,3479,3482],{},[1542,3477,2560],{}," 与 ",[1542,3480,3481],{},"runtime-dom"," 分离",[1531,3484,3485],{},"变化主要体现在第一条和第三条：Vue3 把「一个全局 Vue」拆成了「多个相互隔离的 app」，每个应用有自己的组件注册表、插件和配置，互不干扰。",[1657,3487],{},[1526,3489,3491],{"id":3490},"小节总结","🧾 小节总结",[1617,3493,3494,3510,3521,3532,3538],{},[1620,3495,3496,1606,3498,3500,3501,1683,3503,1683,3505,1683,3507,3509],{},[1542,3497,1605],{},[1542,3499,1576],{}," 是一个普通对象，身上有 ",[1542,3502,2509],{},[1542,3504,1724],{},[1542,3506,2377],{},[1542,3508,1582],{}," 等方法，每个应用相互隔离，避免了 Vue2 全局构造函数带来的污染。",[1620,3511,3512,3514,3515,3517,3518,3520],{},[1542,3513,1605],{}," 由 ",[1542,3516,1878],{}," 生成的渲染器提供；平台 DOM 操作通过 ",[1542,3519,1975],{}," 注入，核心代码不碰 DOM，这就是 Vue3 支持跨平台渲染的关键。",[1620,3522,3523,3525,3526,3528,3529,3531],{},[1542,3524,1582],{}," 的主干四步：创建根组件 vnode → 绑定应用上下文 → ",[1542,3527,2224],{}," 进入 patch → 容器打上 ",[1542,3530,3038],{}," 标记，返回值是根组件实例的代理对象。",[1620,3533,3534,3535,3537],{},"首次渲染的出场顺序：创建组件实例 → 执行 ",[1542,3536,3317],{}," → 建立渲染 effect → 递归 patch 生成真实 DOM。",[1620,3539,3540],{},"effect 与 patch 的细节分别在第 4 篇和第 7 篇展开，本篇先抓住主干。",[1657,3542],{},[1526,3544,3546],{"id":3545},"知识问答","❓ 知识问答",[1531,3548,3549],{},[1644,3550,3551,3552,3554,3555,3558],{},"Q1：",[1542,3553,1605],{}," 和 Vue2 的 ",[1542,3556,3557],{},"new Vue"," 本质区别是什么？",[1531,3560,3561,3562,3564,3565,3567,3568,3570],{},"A：",[1542,3563,3557],{}," 创建的是组件实例，全局配置都挂在共享的 ",[1542,3566,1678],{}," 构造函数上；",[1542,3569,1605],{}," 创建的是应用实例，配置、组件、插件都收在这个 app 内部。一个页面可以存在多个互不影响的 Vue3 应用，这在 Vue2 里很难做到。",[1531,3572,3573],{},[1644,3574,3575,3576,3578,3579,3581],{},"Q2：为什么 ",[1542,3577,1582],{}," 返回的是组件实例的代理对象，而不是 ",[1542,3580,1576],{},"？",[1531,3583,3584,3585,3588,3589,3592,3593,3595,3596,3598],{},"A：因为挂载完成后，你更常需要操作的是根组件本身，比如访问它的方法或状态。返回代理对象，可以直接 ",[1542,3586,3587],{},"const vm = app.mount('#app')"," 后通过 ",[1542,3590,3591],{},"vm"," 访问根组件暴露的内容。",[1542,3594,1576],{}," 的引用你本来就握在手里，不需要 ",[1542,3597,1582],{}," 再还给你。",[1531,3600,3601],{},[1644,3602,3603,3604,3606],{},"Q3：多次调用 ",[1542,3605,1605],{}," 会怎样？",[1531,3608,3609,3610,3612],{},"A：每次调用都得到一个全新的、独立的应用实例，各自有自己的组件注册表、插件和 ",[1542,3611,3098],{},"，互不影响。微前端、一个页面挂多个 Vue 小部件这类场景，靠的就是这个能力。",[1531,3614,3615],{},[1644,3616,3617],{},"Q4：同一个容器可以 mount 两次吗？",[1531,3619,3620,3621,3623,3624,3626,3627,2567],{},"A：不可以。",[1542,3622,1582],{}," 时会检查容器上是否已有 ",[1542,3625,3038],{}," 标记，重复挂载同一个容器会收到警告且不会生效。想重新挂载，先调 ",[1542,3628,3629],{},"app.unmount()",[1531,3631,3632],{},[1644,3633,3634,3635,3637],{},"Q5：",[1542,3636,3429],{}," 之后还没有任何 DOM 操作，对吗？",[1531,3639,3640,3641,3643,3644,3646,3647,1651,3649,3651],{},"A：对。",[1542,3642,1605],{}," 只是创建了应用实例、记录了根组件，真正的 vnode 创建和 DOM 渲染都发生在 ",[1542,3645,1582],{}," 调用时。所以 ",[1542,3648,1605],{},[1542,3650,1582],{}," 之间可以安全地链式安装插件、注册全局组件。",[1657,3653],{},[1526,3655,3657],{"id":3656},"小练习","🧪 小练习",[1531,3659,3660,3661,3663,3664,3666,3667,3669,3670,1651,3672,3674],{},"读懂主干后，动手写一个约 30 行的迷你 ",[1542,3662,1605],{},"，验证自己的理解。要求：返回带 ",[1542,3665,1582],{}," 方法的 app 对象，",[1542,3668,1582],{}," 里执行根组件的 ",[1542,3671,3317],{},[1542,3673,2224],{},"，把结果渲染到指定容器。保存为 HTML 文件用浏览器打开验证。",[1535,3676,3680],{"className":3677,"code":3678,"language":3679,"meta":1540,"style":1540},"language-html shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cdiv id=\"app\">\u003C/div>\n\u003Cscript>\n    function createApp(rootComponent) {\n        // 请在这里编写代码：返回 { mount }\n        // mount 需要完成：\n        // 1. 执行 rootComponent.setup() 拿到状态\n        // 2. 调用 rootComponent.render(state) 得到 { tag, children }\n        // 3. 创建真实 DOM 并插入容器\n        // 4. 在容器上挂 __vue_app__ 标记\n    }\n\n    const App = {\n        setup() {\n            return { message: 'hello mini vue3' };\n        },\n        render(state) {\n            return { tag: 'h1', children: state.message };\n        },\n    };\n\n    createApp(App).mount('#app');\n\u003C/script>\n","html",[1542,3681,3682,3709,3718,3733,3738,3743,3748,3753,3758,3763,3768,3772,3783,3792,3814,3819,3833,3868,3872,3876,3880,3903],{"__ignoreMap":1540},[1545,3683,3684,3687,3689,3692,3694,3697,3699,3701,3704,3706],{"class":1547,"line":1548},[1545,3685,3686],{"class":1559},"\u003C",[1545,3688,2881],{"class":1758},[1545,3690,3691],{"class":1551}," id",[1545,3693,1560],{"class":1559},[1545,3695,3696],{"class":1559},"\"",[1545,3698,1576],{"class":1591},[1545,3700,3696],{"class":1559},[1545,3702,3703],{"class":1559},">\u003C/",[1545,3705,2881],{"class":1758},[1545,3707,3708],{"class":1559},">\n",[1545,3710,3711,3713,3716],{"class":1547,"line":1573},[1545,3712,3686],{"class":1559},[1545,3714,3715],{"class":1758},"script",[1545,3717,3708],{"class":1559},[1545,3719,3720,3723,3725,3727,3729,3731],{"class":1547,"line":1744},[1545,3721,3722],{"class":1551},"    function",[1545,3724,1564],{"class":1563},[1545,3726,1585],{"class":1559},[1545,3728,2246],{"class":2016},[1545,3730,1597],{"class":1559},[1545,3732,2025],{"class":1559},[1545,3734,3735],{"class":1547,"line":1779},[1545,3736,3737],{"class":1714},"        // 请在这里编写代码：返回 { mount }\n",[1545,3739,3740],{"class":1547,"line":1786},[1545,3741,3742],{"class":1714},"        // mount 需要完成：\n",[1545,3744,3745],{"class":1547,"line":1792},[1545,3746,3747],{"class":1714},"        // 1. 执行 rootComponent.setup() 拿到状态\n",[1545,3749,3750],{"class":1547,"line":1807},[1545,3751,3752],{"class":1714},"        // 2. 调用 rootComponent.render(state) 得到 { tag, children }\n",[1545,3754,3755],{"class":1547,"line":1830},[1545,3756,3757],{"class":1714},"        // 3. 创建真实 DOM 并插入容器\n",[1545,3759,3760],{"class":1547,"line":1999},[1545,3761,3762],{"class":1714},"        // 4. 在容器上挂 __vue_app__ 标记\n",[1545,3764,3765],{"class":1547,"line":2028},[1545,3766,3767],{"class":1559},"    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},\n",[1545,3820,3821,3824,3826,3829,3831],{"class":1547,"line":2120},[1545,3822,3823],{"class":1758},"        render",[1545,3825,1585],{"class":1559},[1545,3827,3828],{"class":2016},"state",[1545,3830,1597],{"class":1559},[1545,3832,2025],{"class":1559},[1545,3834,3835,3837,3839,3842,3844,3846,3849,3851,3853,3856,3858,3861,3863,3866],{"class":1547,"line":2142},[1545,3836,3796],{"class":1894},[1545,3838,1898],{"class":1559},[1545,3840,3841],{"class":1758}," tag",[1545,3843,1762],{"class":1559},[1545,3845,1765],{"class":1559},[1545,3847,3848],{"class":1591},"h1",[1545,3850,1588],{"class":1559},[1545,3852,1736],{"class":1559},[1545,3854,3855],{"class":1758}," children",[1545,3857,1762],{"class":1559},[1545,3859,3860],{"class":1555}," 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