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  // 4. 初始化渲染相关：$slots、$scopedSlots、$createElement 等\n    initRender(vm);\n\n    // 5. 触发 beforeCreate\n    callHook(vm, 'beforeCreate');\n\n    // 6. 初始化注入\n    initInjections(vm);\n\n    // 7. 初始化状态：props、methods、data、computed、watch\n    initState(vm);\n\n    // 8. 初始化 provide\n    initProvide(vm);\n\n    // 9. 触发 created\n    callHook(vm, 'created');\n\n    // 10. 如果传了 el，自动挂载\n    if (vm.$options.el) {\n        vm.$mount(vm.$options.el);\n    }\n};\n",[1535,1766,1767,1772,1803,1816,1820,1825,1862,1866,1871,1885,1889,1895,1909,1914,1920,1934,1939,1945,1971,1976,1982,1996,2001,2007,2021,2026,2032,2046,2051,2057,2079,2084,2090,2116,2143,2149],{"__ignoreMap":1571},[1575,1768,1769],{"class":1577,"line":1578},[1575,1770,1771],{"class":1581},"// 简化自 src/core/instance/init.js\n",[1575,1773,1774,1778,1781,1784,1786,1788,1791,1794,1797,1799,1801],{"class":1577,"line":1585},[1575,1775,1777],{"class":1776},"sYGMc","Vue",[1575,1779,1780],{"class":1596},".",[1575,1782,1783],{"class":1622},"prototype",[1575,1785,1780],{"class":1596},[1575,1787,1616],{"class":1592},[1575,1789,1790],{"class":1596}," =",[1575,1792,1793],{"class":1588}," function",[1575,1795,1796],{"class":1596}," (",[1575,1798,1601],{"class":1600},[1575,1800,1604],{"class":1596},[1575,1802,1607],{"class":1596},[1575,1804,1805,1808,1811,1813],{"class":1577,"line":1610},[1575,1806,1807],{"class":1588},"    const",[1575,1809,1810],{"class":1622}," vm",[1575,1812,1790],{"class":1596},[1575,1814,1815],{"class":1596}," this;\n",[1575,1817,1818],{"class":1577,"line":1630},[1575,1819,1640],{"emptyLinePlaceholder":1639},[1575,1821,1822],{"class":1577,"line":1636},[1575,1823,1824],{"class":1581},"    // 1. 合并选项：把用户传入的 options 和构造函数的默认选项合并\n",[1575,1826,1827,1830,1832,1835,1837,1840,1842,1844,1846,1848,1851,1854,1856,1858,1860],{"class":1577,"line":1643},[1575,1828,1829],{"class":1622},"    vm",[1575,1831,1780],{"class":1596},[1575,1833,1834],{"class":1622},"$options",[1575,1836,1790],{"class":1596},[1575,1838,1839],{"class":1592}," mergeOptions",[1575,1841,1597],{"class":1619},[1575,1843,1777],{"class":1622},[1575,1845,1780],{"class":1596},[1575,1847,1601],{"class":1622},[1575,1849,1850],{"class":1596},",",[1575,1852,1853],{"class":1622}," options",[1575,1855,1850],{"class":1596},[1575,1857,1810],{"class":1622},[1575,1859,1604],{"class":1619},[1575,1861,1627],{"class":1596},[1575,1863,1864],{"class":1577,"line":1658},[1575,1865,1640],{"emptyLinePlaceholder":1639},[1575,1867,1868],{"class":1577,"line":1671},[1575,1869,1870],{"class":1581},"    // 2. 初始化生命周期关系：$parent、$children、$refs 等\n",[1575,1872,1873,1876,1878,1881,1883],{"class":1577,"line":1684},[1575,1874,1875],{"class":1592},"    initLifecycle",[1575,1877,1597],{"class":1619},[1575,1879,1880],{"class":1622},"vm",[1575,1882,1604],{"class":1619},[1575,1884,1627],{"class":1596},[1575,1886,1887],{"class":1577,"line":1697},[1575,1888,1640],{"emptyLinePlaceholder":1639},[1575,1890,1892],{"class":1577,"line":1891},11,[1575,1893,1894],{"class":1581},"    // 3. 初始化事件：处理父组件绑定在子组件上的事件监听\n",[1575,1896,1898,1901,1903,1905,1907],{"class":1577,"line":1897},12,[1575,1899,1900],{"class":1592},"    initEvents",[1575,1902,1597],{"class":1619},[1575,1904,1880],{"class":1622},[1575,1906,1604],{"class":1619},[1575,1908,1627],{"class":1596},[1575,1910,1912],{"class":1577,"line":1911},13,[1575,1913,1640],{"emptyLinePlaceholder":1639},[1575,1915,1917],{"class":1577,"line":1916},14,[1575,1918,1919],{"class":1581},"    // 4. 初始化渲染相关：$slots、$scopedSlots、$createElement 等\n",[1575,1921,1923,1926,1928,1930,1932],{"class":1577,"line":1922},15,[1575,1924,1925],{"class":1592},"    initRender",[1575,1927,1597],{"class":1619},[1575,1929,1880],{"class":1622},[1575,1931,1604],{"class":1619},[1575,1933,1627],{"class":1596},[1575,1935,1937],{"class":1577,"line":1936},16,[1575,1938,1640],{"emptyLinePlaceholder":1639},[1575,1940,1942],{"class":1577,"line":1941},17,[1575,1943,1944],{"class":1581},"    // 5. 触发 beforeCreate\n",[1575,1946,1948,1951,1953,1955,1957,1960,1964,1967,1969],{"class":1577,"line":1947},18,[1575,1949,1950],{"class":1592},"    callHook",[1575,1952,1597],{"class":1619},[1575,1954,1880],{"class":1622},[1575,1956,1850],{"class":1596},[1575,1958,1959],{"class":1596}," '",[1575,1961,1963],{"class":1962},"sIEYB","beforeCreate",[1575,1965,1966],{"class":1596},"'",[1575,1968,1604],{"class":1619},[1575,1970,1627],{"class":1596},[1575,1972,1974],{"class":1577,"line":1973},19,[1575,1975,1640],{"emptyLinePlaceholder":1639},[1575,1977,1979],{"class":1577,"line":1978},20,[1575,1980,1981],{"class":1581},"    // 6. 初始化注入\n",[1575,1983,1985,1988,1990,1992,1994],{"class":1577,"line":1984},21,[1575,1986,1987],{"class":1592},"    initInjections",[1575,1989,1597],{"class":1619},[1575,1991,1880],{"class":1622},[1575,1993,1604],{"class":1619},[1575,1995,1627],{"class":1596},[1575,1997,1999],{"class":1577,"line":1998},22,[1575,2000,1640],{"emptyLinePlaceholder":1639},[1575,2002,2004],{"class":1577,"line":2003},23,[1575,2005,2006],{"class":1581},"    // 7. 初始化状态：props、methods、data、computed、watch\n",[1575,2008,2010,2013,2015,2017,2019],{"class":1577,"line":2009},24,[1575,2011,2012],{"class":1592},"    initState",[1575,2014,1597],{"class":1619},[1575,2016,1880],{"class":1622},[1575,2018,1604],{"class":1619},[1575,2020,1627],{"class":1596},[1575,2022,2024],{"class":1577,"line":2023},25,[1575,2025,1640],{"emptyLinePlaceholder":1639},[1575,2027,2029],{"class":1577,"line":2028},26,[1575,2030,2031],{"class":1581},"    // 8. 初始化 provide\n",[1575,2033,2035,2038,2040,2042,2044],{"class":1577,"line":2034},27,[1575,2036,2037],{"class":1592},"    initProvide",[1575,2039,1597],{"class":1619},[1575,2041,1880],{"class":1622},[1575,2043,1604],{"class":1619},[1575,2045,1627],{"class":1596},[1575,2047,2049],{"class":1577,"line":2048},28,[1575,2050,1640],{"emptyLinePlaceholder":1639},[1575,2052,2054],{"class":1577,"line":2053},29,[1575,2055,2056],{"class":1581},"    // 9. 触发 created\n",[1575,2058,2060,2062,2064,2066,2068,2070,2073,2075,2077],{"class":1577,"line":2059},30,[1575,2061,1950],{"class":1592},[1575,2063,1597],{"class":1619},[1575,2065,1880],{"class":1622},[1575,2067,1850],{"class":1596},[1575,2069,1959],{"class":1596},[1575,2071,2072],{"class":1962},"created",[1575,2074,1966],{"class":1596},[1575,2076,1604],{"class":1619},[1575,2078,1627],{"class":1596},[1575,2080,2082],{"class":1577,"line":2081},31,[1575,2083,1640],{"emptyLinePlaceholder":1639},[1575,2085,2087],{"class":1577,"line":2086},32,[1575,2088,2089],{"class":1581},"    // 10. 如果传了 el，自动挂载\n",[1575,2091,2093,2097,2099,2101,2103,2105,2107,2110,2113],{"class":1577,"line":2092},33,[1575,2094,2096],{"class":2095},"s8pZq","    if",[1575,2098,1796],{"class":1619},[1575,2100,1880],{"class":1622},[1575,2102,1780],{"class":1596},[1575,2104,1834],{"class":1622},[1575,2106,1780],{"class":1596},[1575,2108,2109],{"class":1622},"el",[1575,2111,2112],{"class":1619},") ",[1575,2114,2115],{"class":1596},"{\n",[1575,2117,2119,2122,2124,2127,2129,2131,2133,2135,2137,2139,2141],{"class":1577,"line":2118},34,[1575,2120,2121],{"class":1622},"        vm",[1575,2123,1780],{"class":1596},[1575,2125,2126],{"class":1592},"$mount",[1575,2128,1597],{"class":1619},[1575,2130,1880],{"class":1622},[1575,2132,1780],{"class":1596},[1575,2134,1834],{"class":1622},[1575,2136,1780],{"class":1596},[1575,2138,2109],{"class":1622},[1575,2140,1604],{"class":1619},[1575,2142,1627],{"class":1596},[1575,2144,2146],{"class":1577,"line":2145},35,[1575,2147,2148],{"class":1596},"    }\n",[1575,2150,2152],{"class":1577,"line":2151},36,[1575,2153,2154],{"class":1596},"};\n",[1531,2156,2157],{},"这段代码是全文的重点，其中最值得记住的是 5、7、9 三步的相对位置：",[2159,2160,2161,2176,2182],"ul",{},[2162,2163,2164,2167,2168,2171,2172,2175],"li",{},[1535,2165,2166],{},"callHook(vm, 'beforeCreate')"," 在第 5 步，此时 ",[1535,2169,2170],{},"initState"," ",[1547,2173,2174],{},"还没执行","，data、methods 都还没挂到实例上。",[2162,2177,2178,2181],{},[1535,2179,2180],{},"initState(vm)"," 在第 7 步，data、methods、computed 在这里完成初始化。",[2162,2183,2184,2187],{},[1535,2185,2186],{},"callHook(vm, 'created')"," 在第 9 步，此时 data 已经可用了。",[1531,2189,2190,2191,2194],{},"这就是 ",[1547,2192,2193],{},"beforeCreate 拿不到 data、created 能拿到 data"," 的根本原因：不是魔法，只是执行顺序。initState 恰好排在两个钩子之间。",[2196,2197,2198],"tip",{},[1531,2199,2200,2201,2203],{},"很多文章让你背\"生命周期钩子顺序\"，其实不用背。看懂 ",[1535,2202,1616],{}," 这十几行代码，钩子顺序自然就记住了：钩子的触发时机，就是它被写在代码里的位置。",[1552,2205],{},[1526,2207,2209],{"id":2208},"initstate-的内部顺序","⚡ initState 的内部顺序",[1531,2211,2212,2213,2215,2216,2219],{},"上面第 7 步的 ",[1535,2214,2170],{}," 内部也有固定顺序，定义在 ",[1535,2217,2218],{},"src/core/instance/state.js","：",[1566,2221,2223],{"className":1568,"code":2222,"language":1570,"meta":1571,"style":1571},"// 简化自 src/core/instance/state.js\nfunction initState(vm) {\n    const opts = vm.$options;\n    if (opts.props) initProps(vm, opts.props);\n    if (opts.methods) initMethods(vm, opts.methods);\n    if (opts.data) initData(vm);\n    if (opts.computed) initComputed(vm, opts.computed);\n    if (opts.watch) initWatch(vm, opts.watch);\n}\n",[1535,2224,2225,2230,2245,2262,2297,2331,2357,2391,2425],{"__ignoreMap":1571},[1575,2226,2227],{"class":1577,"line":1578},[1575,2228,2229],{"class":1581},"// 简化自 src/core/instance/state.js\n",[1575,2231,2232,2234,2237,2239,2241,2243],{"class":1577,"line":1585},[1575,2233,1589],{"class":1588},[1575,2235,2236],{"class":1592}," initState",[1575,2238,1597],{"class":1596},[1575,2240,1880],{"class":1600},[1575,2242,1604],{"class":1596},[1575,2244,1607],{"class":1596},[1575,2246,2247,2249,2252,2254,2256,2258,2260],{"class":1577,"line":1610},[1575,2248,1807],{"class":1588},[1575,2250,2251],{"class":1622}," opts",[1575,2253,1790],{"class":1596},[1575,2255,1810],{"class":1622},[1575,2257,1780],{"class":1596},[1575,2259,1834],{"class":1622},[1575,2261,1627],{"class":1596},[1575,2263,2264,2266,2268,2271,2273,2276,2278,2281,2283,2285,2287,2289,2291,2293,2295],{"class":1577,"line":1630},[1575,2265,2096],{"class":2095},[1575,2267,1796],{"class":1619},[1575,2269,2270],{"class":1622},"opts",[1575,2272,1780],{"class":1596},[1575,2274,2275],{"class":1622},"props",[1575,2277,2112],{"class":1619},[1575,2279,2280],{"class":1592},"initProps",[1575,2282,1597],{"class":1619},[1575,2284,1880],{"class":1622},[1575,2286,1850],{"class":1596},[1575,2288,2251],{"class":1622},[1575,2290,1780],{"class":1596},[1575,2292,2275],{"class":1622},[1575,2294,1604],{"class":1619},[1575,2296,1627],{"class":1596},[1575,2298,2299,2301,2303,2305,2307,2310,2312,2315,2317,2319,2321,2323,2325,2327,2329],{"class":1577,"line":1636},[1575,2300,2096],{"class":2095},[1575,2302,1796],{"class":1619},[1575,2304,2270],{"class":1622},[1575,2306,1780],{"class":1596},[1575,2308,2309],{"class":1622},"methods",[1575,2311,2112],{"class":1619},[1575,2313,2314],{"class":1592},"initMethods",[1575,2316,1597],{"class":1619},[1575,2318,1880],{"class":1622},[1575,2320,1850],{"class":1596},[1575,2322,2251],{"class":1622},[1575,2324,1780],{"class":1596},[1575,2326,2309],{"class":1622},[1575,2328,1604],{"class":1619},[1575,2330,1627],{"class":1596},[1575,2332,2333,2335,2337,2339,2341,2344,2346,2349,2351,2353,2355],{"class":1577,"line":1643},[1575,2334,2096],{"class":2095},[1575,2336,1796],{"class":1619},[1575,2338,2270],{"class":1622},[1575,2340,1780],{"class":1596},[1575,2342,2343],{"class":1622},"data",[1575,2345,2112],{"class":1619},[1575,2347,2348],{"class":1592},"initData",[1575,2350,1597],{"class":1619},[1575,2352,1880],{"class":1622},[1575,2354,1604],{"class":1619},[1575,2356,1627],{"class":1596},[1575,2358,2359,2361,2363,2365,2367,2370,2372,2375,2377,2379,2381,2383,2385,2387,2389],{"class":1577,"line":1658},[1575,2360,2096],{"class":2095},[1575,2362,1796],{"class":1619},[1575,2364,2270],{"class":1622},[1575,2366,1780],{"class":1596},[1575,2368,2369],{"class":1622},"computed",[1575,2371,2112],{"class":1619},[1575,2373,2374],{"class":1592},"initComputed",[1575,2376,1597],{"class":1619},[1575,2378,1880],{"class":1622},[1575,2380,1850],{"class":1596},[1575,2382,2251],{"class":1622},[1575,2384,1780],{"class":1596},[1575,2386,2369],{"class":1622},[1575,2388,1604],{"class":1619},[1575,2390,1627],{"class":1596},[1575,2392,2393,2395,2397,2399,2401,2404,2406,2409,2411,2413,2415,2417,2419,2421,2423],{"class":1577,"line":1671},[1575,2394,2096],{"class":2095},[1575,2396,1796],{"class":1619},[1575,2398,2270],{"class":1622},[1575,2400,1780],{"class":1596},[1575,2402,2403],{"class":1622},"watch",[1575,2405,2112],{"class":1619},[1575,2407,2408],{"class":1592},"initWatch",[1575,2410,1597],{"class":1619},[1575,2412,1880],{"class":1622},[1575,2414,1850],{"class":1596},[1575,2416,2251],{"class":1622},[1575,2418,1780],{"class":1596},[1575,2420,2403],{"class":1622},[1575,2422,1604],{"class":1619},[1575,2424,1627],{"class":1596},[1575,2426,2427],{"class":1577,"line":1684},[1575,2428,1633],{"class":1596},[1531,2430,2431,2432,2435],{},"顺序是：",[1547,2433,2434],{},"props → methods → data → computed → watch","。这个顺序不是随便排的，而是按依赖关系排的：",[2159,2437,2438,2452,2462],{},[2162,2439,2440,2443,2444,2447,2448,2451],{},[1547,2441,2442],{},"props 先于 data","：data 的初始值经常会引用 props，比如 ",[1535,2445,2446],{},"data() { return { count: this.start } }","。如果 data 先初始化，",[1535,2449,2450],{},"this.start"," 还不存在。",[2162,2453,2454,2457,2458,2461],{},[1547,2455,2456],{},"methods 先于 data","：data 里可能直接调用方法，比如 ",[1535,2459,2460],{},"data() { return { list: this.getDefaultList() } }","，方法必须先就位。",[2162,2463,2464,2467],{},[1547,2465,2466],{},"computed 和 watch 排在最后","：它们通常依赖 data 和 props，自然要等前面都准备好。",[1531,2469,2470,2471,2473],{},"再看 ",[1535,2472,2348],{}," 里一个关键动作：",[1566,2475,2477],{"className":1568,"code":2476,"language":1570,"meta":1571,"style":1571},"// 简化自 src/core/instance/state.js\nfunction initData(vm) {\n    let data = vm.$options.data;\n    data = vm._data = typeof data === 'function' ? data.call(vm, vm) : data || {};\n\n    // 把 data 的属性代理到 vm 上，所以能用 this.xxx 访问\n    proxy(vm, '_data', key);\n\n    // 让 data 变成响应式\n    observe(data);\n}\n",[1535,2478,2479,2483,2498,2520,2581,2585,2590,2616,2620,2625,2638],{"__ignoreMap":1571},[1575,2480,2481],{"class":1577,"line":1578},[1575,2482,2229],{"class":1581},[1575,2484,2485,2487,2490,2492,2494,2496],{"class":1577,"line":1585},[1575,2486,1589],{"class":1588},[1575,2488,2489],{"class":1592}," initData",[1575,2491,1597],{"class":1596},[1575,2493,1880],{"class":1600},[1575,2495,1604],{"class":1596},[1575,2497,1607],{"class":1596},[1575,2499,2500,2503,2506,2508,2510,2512,2514,2516,2518],{"class":1577,"line":1610},[1575,2501,2502],{"class":1588},"    let",[1575,2504,2505],{"class":1622}," data",[1575,2507,1790],{"class":1596},[1575,2509,1810],{"class":1622},[1575,2511,1780],{"class":1596},[1575,2513,1834],{"class":1622},[1575,2515,1780],{"class":1596},[1575,2517,2343],{"class":1622},[1575,2519,1627],{"class":1596},[1575,2521,2522,2525,2527,2529,2531,2534,2536,2539,2541,2544,2546,2548,2550,2553,2555,2557,2560,2562,2564,2566,2568,2570,2573,2575,2578],{"class":1577,"line":1630},[1575,2523,2524],{"class":1622},"    data",[1575,2526,1790],{"class":1596},[1575,2528,1810],{"class":1622},[1575,2530,1780],{"class":1596},[1575,2532,2533],{"class":1622},"_data",[1575,2535,1790],{"class":1596},[1575,2537,2538],{"class":1596}," typeof",[1575,2540,2505],{"class":1622},[1575,2542,2543],{"class":1596}," ===",[1575,2545,1959],{"class":1596},[1575,2547,1589],{"class":1962},[1575,2549,1966],{"class":1596},[1575,2551,2552],{"class":1596}," ?",[1575,2554,2505],{"class":1622},[1575,2556,1780],{"class":1596},[1575,2558,2559],{"class":1592},"call",[1575,2561,1597],{"class":1619},[1575,2563,1880],{"class":1622},[1575,2565,1850],{"class":1596},[1575,2567,1810],{"class":1622},[1575,2569,2112],{"class":1619},[1575,2571,2572],{"class":1596},":",[1575,2574,2505],{"class":1622},[1575,2576,2577],{"class":1596}," ||",[1575,2579,2580],{"class":1596}," {};\n",[1575,2582,2583],{"class":1577,"line":1636},[1575,2584,1640],{"emptyLinePlaceholder":1639},[1575,2586,2587],{"class":1577,"line":1643},[1575,2588,2589],{"class":1581},"    // 把 data 的属性代理到 vm 上，所以能用 this.xxx 访问\n",[1575,2591,2592,2595,2597,2599,2601,2603,2605,2607,2609,2612,2614],{"class":1577,"line":1658},[1575,2593,2594],{"class":1592},"    proxy",[1575,2596,1597],{"class":1619},[1575,2598,1880],{"class":1622},[1575,2600,1850],{"class":1596},[1575,2602,1959],{"class":1596},[1575,2604,2533],{"class":1962},[1575,2606,1966],{"class":1596},[1575,2608,1850],{"class":1596},[1575,2610,2611],{"class":1622}," key",[1575,2613,1604],{"class":1619},[1575,2615,1627],{"class":1596},[1575,2617,2618],{"class":1577,"line":1671},[1575,2619,1640],{"emptyLinePlaceholder":1639},[1575,2621,2622],{"class":1577,"line":1684},[1575,2623,2624],{"class":1581},"    // 让 data 变成响应式\n",[1575,2626,2627,2630,2632,2634,2636],{"class":1577,"line":1697},[1575,2628,2629],{"class":1592},"    observe",[1575,2631,1597],{"class":1619},[1575,2633,2343],{"class":1622},[1575,2635,1604],{"class":1619},[1575,2637,1627],{"class":1596},[1575,2639,2640],{"class":1577,"line":1891},[1575,2641,1633],{"class":1596},[1531,2643,2644,2645,2648,2649,2652,2653,2656,2657,2659,2660,2663,2664,1550,2667,2670],{},"两件事值得注意：一是 ",[1535,2646,2647],{},"proxy"," 把 ",[1535,2650,2651],{},"this._data.xxx"," 代理成了 ",[1535,2654,2655],{},"this.xxx","，所以我们写代码时不用带 ",[1535,2658,2533],{},"；二是最后调用了 ",[1535,2661,2662],{},"observe(data)","，",[1547,2665,2666],{},"响应式就是在这一步建立的",[1535,2668,2669],{},"observe"," 内部如何实现，是下一篇响应式原理的主角，这里先记住\"它发生在 initData 阶段\"就够了。",[1552,2672],{},[1526,2674,2676],{"id":2675},"mount-与渲染-watcher","🎬 $mount 与渲染 watcher",[1531,2678,2679,2681,2682,2684,2685,1550],{},[1535,2680,1616],{}," 结束后，如果传了 ",[1535,2683,2109],{},"，就进入 ",[1535,2686,2687],{},"vm.$mount(el)",[1531,2689,2690,2691,1757,2693,2696,2697,2700,2701,2703,2704,2707,2708,2711],{},"在带编译器的完整版里，",[1535,2692,2126],{},[1535,2694,2695],{},"src/platforms/web/entry-runtime-with-compiler.js","，它负责把 ",[1535,2698,2699],{},"template","（或 ",[1535,2702,2109],{}," 的 outerHTML）编译成 ",[1535,2705,2706],{},"render"," 函数，然后交给 ",[1535,2709,2710],{},"mountComponent"," 完成真正的挂载：",[1566,2713,2715],{"className":1568,"code":2714,"language":1570,"meta":1571,"style":1571},"// 简化自 src/platforms/web/entry-runtime-with-compiler.js\nVue.prototype.$mount = function (el) {\n    el = document.querySelector(el);\n    const options = this.$options;\n\n    // 没有 render 函数，就把 template 编译成 render\n    if (!options.render) {\n        const { render } = compileToFunctions(options.template || el.outerHTML);\n        options.render = render;\n    }\n\n    // 调用运行时版本的 $mount，进入挂载流程\n    return mountComponent(this, el);\n};\n",[1535,2716,2717,2722,2746,2769,2784,2788,2793,2812,2853,2868,2872,2876,2881,2900],{"__ignoreMap":1571},[1575,2718,2719],{"class":1577,"line":1578},[1575,2720,2721],{"class":1581},"// 简化自 src/platforms/web/entry-runtime-with-compiler.js\n",[1575,2723,2724,2726,2728,2730,2732,2734,2736,2738,2740,2742,2744],{"class":1577,"line":1585},[1575,2725,1777],{"class":1776},[1575,2727,1780],{"class":1596},[1575,2729,1783],{"class":1622},[1575,2731,1780],{"class":1596},[1575,2733,2126],{"class":1592},[1575,2735,1790],{"class":1596},[1575,2737,1793],{"class":1588},[1575,2739,1796],{"class":1596},[1575,2741,2109],{"class":1600},[1575,2743,1604],{"class":1596},[1575,2745,1607],{"class":1596},[1575,2747,2748,2751,2753,2756,2758,2761,2763,2765,2767],{"class":1577,"line":1610},[1575,2749,2750],{"class":1622},"    el",[1575,2752,1790],{"class":1596},[1575,2754,2755],{"class":1622}," document",[1575,2757,1780],{"class":1596},[1575,2759,2760],{"class":1592},"querySelector",[1575,2762,1597],{"class":1619},[1575,2764,2109],{"class":1622},[1575,2766,1604],{"class":1619},[1575,2768,1627],{"class":1596},[1575,2770,2771,2773,2775,2777,2780,2782],{"class":1577,"line":1630},[1575,2772,1807],{"class":1588},[1575,2774,1853],{"class":1622},[1575,2776,1790],{"class":1596},[1575,2778,2779],{"class":1596}," this.",[1575,2781,1834],{"class":1622},[1575,2783,1627],{"class":1596},[1575,2785,2786],{"class":1577,"line":1636},[1575,2787,1640],{"emptyLinePlaceholder":1639},[1575,2789,2790],{"class":1577,"line":1643},[1575,2791,2792],{"class":1581},"    // 没有 render 函数，就把 template 编译成 render\n",[1575,2794,2795,2797,2799,2802,2804,2806,2808,2810],{"class":1577,"line":1658},[1575,2796,2096],{"class":2095},[1575,2798,1796],{"class":1619},[1575,2800,2801],{"class":1596},"!",[1575,2803,1601],{"class":1622},[1575,2805,1780],{"class":1596},[1575,2807,2706],{"class":1622},[1575,2809,2112],{"class":1619},[1575,2811,2115],{"class":1596},[1575,2813,2814,2817,2820,2823,2826,2828,2831,2833,2835,2837,2839,2841,2844,2846,2849,2851],{"class":1577,"line":1671},[1575,2815,2816],{"class":1588},"        const",[1575,2818,2819],{"class":1596}," {",[1575,2821,2822],{"class":1622}," render",[1575,2824,2825],{"class":1596}," }",[1575,2827,1790],{"class":1596},[1575,2829,2830],{"class":1592}," compileToFunctions",[1575,2832,1597],{"class":1619},[1575,2834,1601],{"class":1622},[1575,2836,1780],{"class":1596},[1575,2838,2699],{"class":1622},[1575,2840,2577],{"class":1596},[1575,2842,2843],{"class":1622}," el",[1575,2845,1780],{"class":1596},[1575,2847,2848],{"class":1622},"outerHTML",[1575,2850,1604],{"class":1619},[1575,2852,1627],{"class":1596},[1575,2854,2855,2858,2860,2862,2864,2866],{"class":1577,"line":1684},[1575,2856,2857],{"class":1622},"        options",[1575,2859,1780],{"class":1596},[1575,2861,2706],{"class":1622},[1575,2863,1790],{"class":1596},[1575,2865,2822],{"class":1622},[1575,2867,1627],{"class":1596},[1575,2869,2870],{"class":1577,"line":1697},[1575,2871,2148],{"class":1596},[1575,2873,2874],{"class":1577,"line":1891},[1575,2875,1640],{"emptyLinePlaceholder":1639},[1575,2877,2878],{"class":1577,"line":1897},[1575,2879,2880],{"class":1581},"    // 调用运行时版本的 $mount，进入挂载流程\n",[1575,2882,2883,2886,2889,2891,2894,2896,2898],{"class":1577,"line":1911},[1575,2884,2885],{"class":2095},"    return",[1575,2887,2888],{"class":1592}," mountComponent",[1575,2890,1597],{"class":1619},[1575,2892,2893],{"class":1596},"this,",[1575,2895,2843],{"class":1622},[1575,2897,1604],{"class":1619},[1575,2899,1627],{"class":1596},[1575,2901,2902],{"class":1577,"line":1916},[1575,2903,2154],{"class":1596},[1531,2905,2906,2908,2909,2912],{},[1535,2907,2710],{}," 在 ",[1535,2910,2911],{},"src/core/instance/lifecycle.js","，简化后：",[1566,2914,2916],{"className":1568,"code":2915,"language":1570,"meta":1571,"style":1571},"// 简化自 src/core/instance/lifecycle.js\nfunction mountComponent(vm, el) {\n    vm.$el = el;\n\n    callHook(vm, 'beforeMount');\n\n    const updateComponent = () => {\n        vm._update(vm._render());\n    };\n\n    // 创建渲染 watcher：立即执行一次 updateComponent，完成首次渲染\n    new Watcher(vm, updateComponent);\n\n    callHook(vm, 'mounted');\n    return vm;\n}\n",[1535,2917,2918,2923,2941,2956,2960,2981,2985,3002,3025,3030,3034,3039,3059,3063,3084,3092],{"__ignoreMap":1571},[1575,2919,2920],{"class":1577,"line":1578},[1575,2921,2922],{"class":1581},"// 简化自 src/core/instance/lifecycle.js\n",[1575,2924,2925,2927,2929,2931,2933,2935,2937,2939],{"class":1577,"line":1585},[1575,2926,1589],{"class":1588},[1575,2928,2888],{"class":1592},[1575,2930,1597],{"class":1596},[1575,2932,1880],{"class":1600},[1575,2934,1850],{"class":1596},[1575,2936,2843],{"class":1600},[1575,2938,1604],{"class":1596},[1575,2940,1607],{"class":1596},[1575,2942,2943,2945,2947,2950,2952,2954],{"class":1577,"line":1610},[1575,2944,1829],{"class":1622},[1575,2946,1780],{"class":1596},[1575,2948,2949],{"class":1622},"$el",[1575,2951,1790],{"class":1596},[1575,2953,2843],{"class":1622},[1575,2955,1627],{"class":1596},[1575,2957,2958],{"class":1577,"line":1630},[1575,2959,1640],{"emptyLinePlaceholder":1639},[1575,2961,2962,2964,2966,2968,2970,2972,2975,2977,2979],{"class":1577,"line":1636},[1575,2963,1950],{"class":1592},[1575,2965,1597],{"class":1619},[1575,2967,1880],{"class":1622},[1575,2969,1850],{"class":1596},[1575,2971,1959],{"class":1596},[1575,2973,2974],{"class":1962},"beforeMount",[1575,2976,1966],{"class":1596},[1575,2978,1604],{"class":1619},[1575,2980,1627],{"class":1596},[1575,2982,2983],{"class":1577,"line":1643},[1575,2984,1640],{"emptyLinePlaceholder":1639},[1575,2986,2987,2989,2992,2994,2997,3000],{"class":1577,"line":1658},[1575,2988,1807],{"class":1588},[1575,2990,2991],{"class":1622}," updateComponent",[1575,2993,1790],{"class":1596},[1575,2995,2996],{"class":1596}," ()",[1575,2998,2999],{"class":1588}," =>",[1575,3001,1607],{"class":1596},[1575,3003,3004,3006,3008,3011,3013,3015,3017,3020,3023],{"class":1577,"line":1671},[1575,3005,2121],{"class":1622},[1575,3007,1780],{"class":1596},[1575,3009,3010],{"class":1592},"_update",[1575,3012,1597],{"class":1619},[1575,3014,1880],{"class":1622},[1575,3016,1780],{"class":1596},[1575,3018,3019],{"class":1592},"_render",[1575,3021,3022],{"class":1619},"())",[1575,3024,1627],{"class":1596},[1575,3026,3027],{"class":1577,"line":1684},[1575,3028,3029],{"class":1596},"    };\n",[1575,3031,3032],{"class":1577,"line":1697},[1575,3033,1640],{"emptyLinePlaceholder":1639},[1575,3035,3036],{"class":1577,"line":1891},[1575,3037,3038],{"class":1581},"    // 创建渲染 watcher：立即执行一次 updateComponent，完成首次渲染\n",[1575,3040,3041,3044,3047,3049,3051,3053,3055,3057],{"class":1577,"line":1897},[1575,3042,3043],{"class":1596},"    new",[1575,3045,3046],{"class":1592}," Watcher",[1575,3048,1597],{"class":1619},[1575,3050,1880],{"class":1622},[1575,3052,1850],{"class":1596},[1575,3054,2991],{"class":1622},[1575,3056,1604],{"class":1619},[1575,3058,1627],{"class":1596},[1575,3060,3061],{"class":1577,"line":1911},[1575,3062,1640],{"emptyLinePlaceholder":1639},[1575,3064,3065,3067,3069,3071,3073,3075,3078,3080,3082],{"class":1577,"line":1916},[1575,3066,1950],{"class":1592},[1575,3068,1597],{"class":1619},[1575,3070,1880],{"class":1622},[1575,3072,1850],{"class":1596},[1575,3074,1959],{"class":1596},[1575,3076,3077],{"class":1962},"mounted",[1575,3079,1966],{"class":1596},[1575,3081,1604],{"class":1619},[1575,3083,1627],{"class":1596},[1575,3085,3086,3088,3090],{"class":1577,"line":1922},[1575,3087,2885],{"class":2095},[1575,3089,1810],{"class":1622},[1575,3091,1627],{"class":1596},[1575,3093,3094],{"class":1577,"line":1936},[1575,3095,1633],{"class":1596},[1531,3097,3098,3099,3102],{},"这里的核心是 ",[1535,3100,3101],{},"updateComponent","，它干两件事：",[3104,3105,3106,3112],"ol",{},[2162,3107,3108,3111],{},[1535,3109,3110],{},"vm._render()","：执行 render 函数，生成虚拟 DOM（vnode）。",[2162,3113,3114,3117],{},[1535,3115,3116],{},"vm._update(vnode)","：把 vnode 打补丁到真实 DOM，首次渲染时就是创建所有元素。",[1531,3119,3120,3121,3124,3125,3128,3129,3131,3132,3134],{},"而 ",[1535,3122,3123],{},"new Watcher(vm, updateComponent)"," 创建的就是常说的",[1547,3126,3127],{},"渲染 watcher","。它一创建就立即执行 ",[1535,3130,3101],{},"，完成首次渲染；更妙的是，执行过程中读到的 data 属性会被 watcher 记录下来，之后这些属性一变，watcher 就会重新执行 ",[1535,3133,3101],{},"，页面自动更新。这就是\"数据驱动视图\"的落地方式，响应式原理篇会详细展开。",[1531,3136,3137,3138,3140,3141,3143],{},"同样注意钩子位置：",[1535,3139,2974],{}," 在创建 watcher 之前（DOM 还没渲染），",[1535,3142,3077],{}," 在之后（页面已经渲染完成）。",[1552,3145],{},[1526,3147,3149],{"id":3148},"全流程回顾","🧵 全流程回顾",[1531,3151,3152,3153,3155],{},"把整条链路串起来，从 ",[1535,3154,1544],{}," 到页面渲染完成，顺序是：",[1566,3157,3162],{"className":3158,"code":3160,"language":3161,"meta":1571},[3159],"language-text","new Vue(options)\n  │\n  ▼\n_init(options)\n  ├─ 合并 options\n  ├─ initLifecycle / initEvents / initRender\n  ├─ ▶ beforeCreate（拿不到 data、methods）\n  ├─ initInjections\n  ├─ initState：props → methods → data（observe 建立响应式）→ computed → watch\n  ├─ initProvide\n  ├─ ▶ created（可以拿到 data、methods，但页面还没渲染）\n  │\n  ▼\n$mount(el)（传了 el 时自动调用）\n  ├─ 编译 template 得到 render 函数\n  │\n  ▼\nmountComponent\n  ├─ ▶ beforeMount\n  ├─ new Watcher(vm, updateComponent)：_render() 生成 vnode，_update() 渲染到页面\n  └─ ▶ mounted（页面渲染完成，可以操作 DOM）\n","text",[1535,3163,3160],{"__ignoreMap":1571},[1531,3165,3166,3167,3169,3170,3173],{},"记住三个关键分界点：",[1535,3168,2170],{}," 在 beforeCreate 与 created 之间，",[1535,3171,3172],{},"new Watcher"," 在 beforeMount 与 mounted 之间，而模板编译（template → render）发生在 created 之后、beforeMount 之前。",[1552,3175],{},[1526,3177,3179],{"id":3178},"小节总结","🧾 小节总结",[2159,3181,3182,3185,3190,3196,3207],{},[2162,3183,3184],{},"Vue 2 用 function 而非 class 定义构造函数，是为了把功能拆成多个 Mixin，分别挂到原型上。",[2162,3186,3187,3189],{},[1535,3188,1616],{}," 是初始化总调度：合并选项、初始化生命周期/事件/渲染，穿插触发 beforeCreate 和 created。",[2162,3191,3192,3193,3195],{},"beforeCreate 拿不到 data 而 created 可以，因为 ",[1535,3194,2170],{}," 恰好排在两个钩子之间执行。",[2162,3197,3198,3200,3201,3203,3204,3206],{},[1535,3199,2170],{}," 按 props → methods → data → computed → watch 的顺序初始化，顺序由依赖关系决定；data 在 ",[1535,3202,2348],{}," 中通过 ",[1535,3205,2669],{}," 变成响应式。",[2162,3208,3209,3211,3212,3214],{},[1535,3210,2126],{}," 把 template 编译成 render 函数，",[1535,3213,2710],{}," 创建渲染 watcher 完成首次渲染，beforeMount 在其前、mounted 在其后。",[1552,3216],{},[1526,3218,3220],{"id":3219},"知识问答","❓ 知识问答",[1531,3222,3223],{},[1547,3224,3225],{},"Q1：beforeCreate 里能做什么？",[1531,3227,3228],{},"A：此时 data、methods、事件都还没初始化，能做的事情很少。常见用途是做一些和实例数据无关的准备，或者配合插件在很早的时机注入全局逻辑。一般业务代码很少用到它。",[1531,3230,3231],{},[1547,3232,3233],{},"Q2：created 里能操作 DOM 吗？",[1531,3235,3236,3237,3239,3240,3243],{},"A：不能。created 时 ",[1535,3238,2126],{}," 还没开始，页面上没有渲染出任何元素，",[1535,3241,3242],{},"this.$el"," 也拿不到有效值。想操作渲染好的 DOM，应该放到 mounted 里。",[1531,3245,3246],{},[1547,3247,3248],{},"Q3：为什么 data 要写成函数返回对象？",[1531,3250,3251,3252,3255,3256,3258],{},"A：这和本篇的顺序有关：组件被复用时每个实例都会执行 ",[1535,3253,3254],{},"data.call(vm, vm)"," 得到一份全新的对象，多个实例之间互不干扰。如果直接写对象，所有实例会共享同一份数据。根实例（",[1535,3257,1544],{},"）只有一个，所以写对象也不会出问题。",[1531,3260,3261],{},[1547,3262,3263],{},"Q4：没传 el 的话，还会自动渲染吗？",[1531,3265,3266,3267,3269,3270,3273,3274,3277],{},"A：不会。",[1535,3268,1616],{}," 末尾判断了 ",[1535,3271,3272],{},"vm.$options.el","，没传就停在 created 之后，需要你手动调用 ",[1535,3275,3276],{},"vm.$mount('#app')","，后面的流程完全一样。",[1531,3279,3280],{},[1547,3281,3282],{},"Q5：template、render、el 同时存在时用哪个？",[1531,3284,3285,3286,3288,3289,3291,3292,3294,3295,3297,3298,3300],{},"A：",[1535,3287,2126],{}," 里优先用已有的 ",[1535,3290,2706],{}," 函数；没有 render 才会拿 ",[1535,3293,2699],{}," 去编译；",[1535,3296,2699],{}," 也没有就用 ",[1535,3299,2109],{}," 的 outerHTML 编译。所以优先级是 render > template > el。",[1552,3302],{},[1526,3304,3306],{"id":3305},"小练习","🧪 小练习",[3104,3308,3309],{},[2162,3310,3311,3312,3315,3316,3318,3319,3318,3321,3318,3323,3325,3326,3329,3330,3333],{},"用 Node.js v22，通过 ",[1535,3313,3314],{},"npm i vue@2.7.16"," 安装后在页面中引入（或用 CDN 引入 2.7.16），写一个根实例，在 ",[1535,3317,1963],{},"、",[1535,3320,2072],{},[1535,3322,2974],{},[1535,3324,3077],{}," 四个钩子里分别打印 ",[1535,3327,3328],{},"this.count","（data 中定义）和 ",[1535,3331,3332],{},"document.querySelector('#app').innerHTML","，观察哪一步开始能拿到数据、哪一步页面才真正有内容。",[1566,3335,3340],{"className":3336,"code":3337,"filename":3338,"language":3339,"meta":1571,"style":1571},"language-vue shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cscript>\nexport default {\n    data() {\n        return { count: 1 };\n    },\n    beforeCreate() {\n        // 请在这里编写代码：打印 this.count，观察结果\n    },\n    created() {\n        // 请在这里编写代码：打印 this.count 和 #app 的内容，观察结果\n    },\n    mounted() {\n        // 请在这里编写代码：再次打印 #app 的内容，对比 created 时的差异\n    },\n};\n\u003C/script>\n","App.vue","vue",[1535,3341,3342,3353,3363,3372,3391,3396,3405,3410,3414,3423,3428,3432,3441,3446,3450,3454],{"__ignoreMap":1571},[1575,3343,3344,3347,3350],{"class":1577,"line":1578},[1575,3345,3346],{"class":1596},"\u003C",[1575,3348,3349],{"class":1619},"script",[1575,3351,3352],{"class":1596},">\n",[1575,3354,3355,3358,3361],{"class":1577,"line":1585},[1575,3356,3357],{"class":2095},"export",[1575,3359,3360],{"class":2095}," default",[1575,3362,1607],{"class":1596},[1575,3364,3365,3367,3370],{"class":1577,"line":1610},[1575,3366,2524],{"class":1619},[1575,3368,3369],{"class":1596},"()",[1575,3371,1607],{"class":1596},[1575,3373,3374,3377,3379,3382,3384,3388],{"class":1577,"line":1630},[1575,3375,3376],{"class":2095},"        return",[1575,3378,2819],{"class":1596},[1575,3380,3381],{"class":1619}," count",[1575,3383,2572],{"class":1596},[1575,3385,3387],{"class":3386},"smPcV"," 1",[1575,3389,3390],{"class":1596}," };\n",[1575,3392,3393],{"class":1577,"line":1636},[1575,3394,3395],{"class":1596},"    },\n",[1575,3397,3398,3401,3403],{"class":1577,"line":1643},[1575,3399,3400],{"class":1619},"    beforeCreate",[1575,3402,3369],{"class":1596},[1575,3404,1607],{"class":1596},[1575,3406,3407],{"class":1577,"line":1658},[1575,3408,3409],{"class":1581},"        // 请在这里编写代码：打印 this.count，观察结果\n",[1575,3411,3412],{"class":1577,"line":1671},[1575,3413,3395],{"class":1596},[1575,3415,3416,3419,3421],{"class":1577,"line":1684},[1575,3417,3418],{"class":1619},"    created",[1575,3420,3369],{"class":1596},[1575,3422,1607],{"class":1596},[1575,3424,3425],{"class":1577,"line":1697},[1575,3426,3427],{"class":1581},"        // 请在这里编写代码：打印 this.count 和 #app 的内容，观察结果\n",[1575,3429,3430],{"class":1577,"line":1891},[1575,3431,3395],{"class":1596},[1575,3433,3434,3437,3439],{"class":1577,"line":1897},[1575,3435,3436],{"class":1619},"    mounted",[1575,3438,3369],{"class":1596},[1575,3440,1607],{"class":1596},[1575,3442,3443],{"class":1577,"line":1911},[1575,3444,3445],{"class":1581},"        // 请在这里编写代码：再次打印 #app 的内容，对比 created 时的差异\n",[1575,3447,3448],{"class":1577,"line":1916},[1575,3449,3395],{"class":1596},[1575,3451,3452],{"class":1577,"line":1922},[1575,3453,2154],{"class":1596},[1575,3455,3456,3459,3461],{"class":1577,"line":1936},[1575,3457,3458],{"class":1596},"\u003C/",[1575,3460,3349],{"class":1619},[1575,3462,3352],{"class":1596},[3104,3464,3465],{"start":1585},[2162,3466,3467,3468,3470],{},"对照本文的流程图，不看答案，自己在纸上默写一遍 ",[1535,3469,1616],{}," 的执行顺序，并标出四个钩子触发的位置。",[1552,3472],{},[1531,3474,3475,3476,3478],{},"🎉 恭喜你已经掌握了 Vue2 的初始化主链路！下一篇我们深入 ",[1535,3477,2669],{},"，看看响应式到底是怎么建立的。",[3480,3481,3482],"style",{},"html pre.shiki code .syuKq, html code.shiki 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