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render",[1583,1765,1766],{"class":1608},":",[1583,1768,1723],{"class":1604},[1583,1770,1669],{"class":1608},[1583,1772,1773],{"class":1604},"render",[1583,1775,1757],{"class":1608},[1583,1777,1779],{"class":1585,"line":1778},12,[1583,1780,1781],{"class":1608},"    };\n",[1583,1783,1785,1788,1790],{"class":1585,"line":1784},13,[1583,1786,1787],{"class":1608},"}",[1583,1789,1637],{"class":1604},[1583,1791,1684],{"class":1608},[1531,1793,1794],{},"三个阶段各司其职：",[1796,1797,1798,1805,1811],"ul",{},[1799,1800,1801,1804],"li",{},[1549,1802,1803],{},"parse","：把模板字符串解析成 AST（抽象语法树）。",[1799,1806,1807,1810],{},[1549,1808,1809],{},"optimize","：遍历 AST，标记静态节点，为后续更新做优化。",[1799,1812,1813,1816,1817,1820,1821,1824],{},[1549,1814,1815],{},"generate","：把 AST 转成 ",[1540,1818,1819],{},"_c('div', ...)"," 这样的代码字符串，最终通过 ",[1540,1822,1823],{},"new Function"," 变成 render 函数。",[1531,1826,1827,1828,1551],{},"你可以把它想象成翻译一篇文章：",[1549,1829,1830],{},"先读懂原文断句（parse），再划出不用每次重翻的固定段落（optimize），最后写出译文（generate）",[1560,1832],{},[1526,1834,1836],{"id":1835},"parse模板-ast","🧱 parse：模板 → AST",[1531,1838,1839,1840,1843,1844,1847,1848,1851],{},"parse 的源码在 ",[1540,1841,1842],{},"src/compiler/parser/index.js","，有几百行，但核心思路很朴素：",[1549,1845,1846],{},"用正则从头到尾逐段扫描模板字符串","，遇到开始标签、属性、结束标签、文本就分别处理，边解析边用一个",[1549,1849,1850],{},"栈","维护父子关系。",[1531,1853,1854],{},"简化后的工作流程：",[1574,1856,1858],{"className":1576,"code":1857,"filename":1842,"language":1578,"meta":1579,"style":1579},"// 简化自 src/compiler/parser/index.js 的核心思路\nfunction parse(template) {\n    const stack = []; // 栈：维护当前解析到哪一层\n    let root; // AST 根节点\n\n    while (template) {\n        if (template 以结束标签开头) {\n            // 如 \u003C/div>：栈顶元素出栈，表示这一层解析完了\n            stack.pop();\n        } else if (template 以开始标签开头) {\n            // 如 \u003Cdiv id=\"app\">：创建元素节点\n            const element = { type: 1, tag: 'div', attrsList: [...], children: [] };\n            if (!root) root = element;\n            // 挂到栈顶元素的 children 里，然后自己入栈\n            stack.push(element);\n        } else {\n            // 文本：创建文本节点，挂到栈顶元素下\n            // 带 {{}} 的文本 type 为 2，纯文本 type 为 3\n        }\n        // 每处理完一段，就把这段从 template 中截掉，继续循环\n    }\n    return root;\n}\n",[1540,1859,1860,1865,1879,1897,1910,1916,1932,1948,1953,1967,1989,1994,2062,2085,2091,2110,2119,2125,2131,2137,2143,2149,2158],{"__ignoreMap":1579},[1583,1861,1862],{"class":1585,"line":1586},[1583,1863,1864],{"class":1589},"// 简化自 src/compiler/parser/index.js 的核心思路\n",[1583,1866,1867,1869,1871,1873,1875,1877],{"class":1585,"line":1593},[1583,1868,1619],{"class":1600},[1583,1870,1661],{"class":1612},[1583,1872,1616],{"class":1608},[1583,1874,1628],{"class":1627},[1583,1876,1637],{"class":1608},[1583,1878,1640],{"class":1608},[1583,1880,1881,1883,1886,1888,1891,1894],{"class":1585,"line":1643},[1583,1882,1652],{"class":1600},[1583,1884,1885],{"class":1604}," stack",[1583,1887,1658],{"class":1608},[1583,1889,1890],{"class":1664}," []",[1583,1892,1893],{"class":1608},";",[1583,1895,1896],{"class":1589}," // 栈：维护当前解析到哪一层\n",[1583,1898,1899,1902,1905,1907],{"class":1585,"line":1649},[1583,1900,1901],{"class":1600},"    let",[1583,1903,1904],{"class":1604}," root",[1583,1906,1893],{"class":1608},[1583,1908,1909],{"class":1589}," // AST 根节点\n",[1583,1911,1912],{"class":1585,"line":1687},[1583,1913,1915],{"emptyLinePlaceholder":1914},true,"\n",[1583,1917,1918,1921,1924,1926,1929],{"class":1585,"line":1693},[1583,1919,1920],{"class":1596},"    while",[1583,1922,1923],{"class":1664}," (",[1583,1925,1628],{"class":1604},[1583,1927,1928],{"class":1664},") ",[1583,1930,1931],{"class":1608},"{\n",[1583,1933,1934,1937,1939,1941,1944,1946],{"class":1585,"line":1712},[1583,1935,1936],{"class":1596},"        if",[1583,1938,1923],{"class":1664},[1583,1940,1628],{"class":1604},[1583,1942,1943],{"class":1604}," 以结束标签开头",[1583,1945,1928],{"class":1664},[1583,1947,1931],{"class":1608},[1583,1949,1950],{"class":1585,"line":1718},[1583,1951,1952],{"class":1589},"            // 如 \u003C/div>：栈顶元素出栈，表示这一层解析完了\n",[1583,1954,1955,1958,1960,1963,1965],{"class":1585,"line":1743},[1583,1956,1957],{"class":1604},"            stack",[1583,1959,1669],{"class":1608},[1583,1961,1962],{"class":1612},"pop",[1583,1964,1675],{"class":1664},[1583,1966,1684],{"class":1608},[1583,1968,1969,1972,1975,1978,1980,1982,1985,1987],{"class":1585,"line":1751},[1583,1970,1971],{"class":1608},"        }",[1583,1973,1974],{"class":1596}," else",[1583,1976,1977],{"class":1596}," if",[1583,1979,1923],{"class":1664},[1583,1981,1628],{"class":1604},[1583,1983,1984],{"class":1604}," 以开始标签开头",[1583,1986,1928],{"class":1664},[1583,1988,1931],{"class":1608},[1583,1990,1991],{"class":1585,"line":1760},[1583,1992,1993],{"class":1589},"            // 如 \u003Cdiv id=\"app\">：创建元素节点\n",[1583,1995,1996,1999,2002,2004,2007,2010,2012,2016,2018,2021,2023,2026,2030,2033,2035,2038,2040,2043,2046,2049,2051,2054,2056,2059],{"class":1585,"line":1778},[1583,1997,1998],{"class":1600},"            const",[1583,2000,2001],{"class":1604}," element",[1583,2003,1658],{"class":1608},[1583,2005,2006],{"class":1608}," {",[1583,2008,2009],{"class":1664}," type",[1583,2011,1766],{"class":1608},[1583,2013,2015],{"class":2014},"smPcV"," 1",[1583,2017,1631],{"class":1608},[1583,2019,2020],{"class":1664}," tag",[1583,2022,1766],{"class":1608},[1583,2024,2025],{"class":1608}," '",[1583,2027,2029],{"class":2028},"sIEYB","div",[1583,2031,2032],{"class":1608},"'",[1583,2034,1631],{"class":1608},[1583,2036,2037],{"class":1664}," attrsList",[1583,2039,1766],{"class":1608},[1583,2041,2042],{"class":1664}," [",[1583,2044,2045],{"class":1608},"...",[1583,2047,2048],{"class":1664},"]",[1583,2050,1631],{"class":1608},[1583,2052,2053],{"class":1664}," children",[1583,2055,1766],{"class":1608},[1583,2057,2058],{"class":1664}," [] ",[1583,2060,2061],{"class":1608},"};\n",[1583,2063,2064,2067,2069,2072,2075,2077,2079,2081,2083],{"class":1585,"line":1784},[1583,2065,2066],{"class":1596},"            if",[1583,2068,1923],{"class":1664},[1583,2070,2071],{"class":1608},"!",[1583,2073,2074],{"class":1604},"root",[1583,2076,1928],{"class":1664},[1583,2078,2074],{"class":1604},[1583,2080,1658],{"class":1608},[1583,2082,2001],{"class":1604},[1583,2084,1684],{"class":1608},[1583,2086,2088],{"class":1585,"line":2087},14,[1583,2089,2090],{"class":1589},"            // 挂到栈顶元素的 children 里，然后自己入栈\n",[1583,2092,2094,2096,2098,2101,2103,2106,2108],{"class":1585,"line":2093},15,[1583,2095,1957],{"class":1604},[1583,2097,1669],{"class":1608},[1583,2099,2100],{"class":1612},"push",[1583,2102,1616],{"class":1664},[1583,2104,2105],{"class":1604},"element",[1583,2107,1637],{"class":1664},[1583,2109,1684],{"class":1608},[1583,2111,2113,2115,2117],{"class":1585,"line":2112},16,[1583,2114,1971],{"class":1608},[1583,2116,1974],{"class":1596},[1583,2118,1640],{"class":1608},[1583,2120,2122],{"class":1585,"line":2121},17,[1583,2123,2124],{"class":1589},"            // 文本：创建文本节点，挂到栈顶元素下\n",[1583,2126,2128],{"class":1585,"line":2127},18,[1583,2129,2130],{"class":1589},"            // 带 {{}} 的文本 type 为 2，纯文本 type 为 3\n",[1583,2132,2134],{"class":1585,"line":2133},19,[1583,2135,2136],{"class":1608},"        }\n",[1583,2138,2140],{"class":1585,"line":2139},20,[1583,2141,2142],{"class":1589},"        // 每处理完一段，就把这段从 template 中截掉，继续循环\n",[1583,2144,2146],{"class":1585,"line":2145},21,[1583,2147,2148],{"class":1608},"    }\n",[1583,2150,2152,2154,2156],{"class":1585,"line":2151},22,[1583,2153,1746],{"class":1596},[1583,2155,1904],{"class":1604},[1583,2157,1684],{"class":1608},[1583,2159,2161],{"class":1585,"line":2160},23,[1583,2162,2163],{"class":1608},"}\n",[1531,2165,2166,2169],{},[1549,2167,2168],{},"栈的作用","是记住\"当前元素的父亲是谁\"：遇到开始标签就入栈，遇到结束标签就出栈，栈顶永远是当前正在解析的父元素。",[2171,2172,2174],"h3",{"id":2173},"ast-节点的三种-type","AST 节点的三种 type",[1531,2176,2177,2178,2181],{},"parse 产出的 AST 节点用一个 ",[1540,2179,2180],{},"type"," 字段区分类型，只有三种：",[2183,2184,2185,2200],"table",{},[2186,2187,2188],"thead",{},[2189,2190,2191,2194,2197],"tr",{},[2192,2193,2180],"th",{},[2192,2195,2196],{},"含义",[2192,2198,2199],{},"例子",[2201,2202,2203,2220,2232],"tbody",{},[2189,2204,2205,2209,2212],{},[2206,2207,2208],"td",{},"1",[2206,2210,2211],{},"元素节点",[2206,2213,2214,1543,2217],{},[1540,2215,2216],{},"\u003Cdiv>",[1540,2218,2219],{},"\u003Cp>",[2189,2221,2222,2225,2228],{},[2206,2223,2224],{},"2",[2206,2226,2227],{},"带表达式的文本节点",[2206,2229,2230],{},[1540,2231,1542],{},[2189,2233,2234,2237,2240],{},[2206,2235,2236],{},"3",[2206,2238,2239],{},"纯文本节点",[2206,2241,2242],{},[1540,2243,2244],{},"hello",[2171,2246,2248],{"id":2247},"一个简单模板的-ast-示意","一个简单模板的 AST 示意",[1531,2250,2251],{},"模板：",[1574,2253,2257],{"className":2254,"code":2255,"language":2256,"meta":1579,"style":1579},"language-html shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cdiv id=\"app\">\n    \u003Cp>{{ message }}\u003C/p>\n    hello\n\u003C/div>\n","html",[1540,2258,2259,2282,2301,2306],{"__ignoreMap":1579},[1583,2260,2261,2264,2266,2269,2271,2274,2277,2279],{"class":1585,"line":1586},[1583,2262,2263],{"class":1608},"\u003C",[1583,2265,2029],{"class":1664},[1583,2267,2268],{"class":1600}," id",[1583,2270,1609],{"class":1608},[1583,2272,2273],{"class":1608},"\"",[1583,2275,2276],{"class":2028},"app",[1583,2278,2273],{"class":1608},[1583,2280,2281],{"class":1608},">\n",[1583,2283,2284,2287,2289,2292,2294,2297,2299],{"class":1585,"line":1593},[1583,2285,2286],{"class":1608},"    \u003C",[1583,2288,1531],{"class":1664},[1583,2290,2291],{"class":1608},">",[1583,2293,1542],{"class":1604},[1583,2295,2296],{"class":1608},"\u003C/",[1583,2298,1531],{"class":1664},[1583,2300,2281],{"class":1608},[1583,2302,2303],{"class":1585,"line":1643},[1583,2304,2305],{"class":1604},"    hello\n",[1583,2307,2308,2310,2312],{"class":1585,"line":1649},[1583,2309,2296],{"class":1608},[1583,2311,2029],{"class":1664},[1583,2313,2281],{"class":1608},[1531,2315,2316],{},"对应的 AST 大致长这样：",[1574,2318,2320],{"className":1576,"code":2319,"language":1578,"meta":1579,"style":1579},"{\n    type: 1,\n    tag: 'div',\n    attrsList: [{ name: 'id', value: 'app' }],\n    children: [\n        {\n            type: 1,\n            tag: 'p',\n            children: [\n                { type: 2, expression: '_s(message)', text: '{{ message }}' },\n            ],\n        },\n        { type: 3, text: 'hello' },\n    ],\n}\n",[1540,2321,2322,2326,2338,2353,2397,2407,2412,2423,2438,2447,2489,2496,2501,2527,2534],{"__ignoreMap":1579},[1583,2323,2324],{"class":1585,"line":1586},[1583,2325,1931],{"class":1608},[1583,2327,2328,2332,2334,2336],{"class":1585,"line":1593},[1583,2329,2331],{"class":2330},"sYGMc","    type",[1583,2333,1766],{"class":1608},[1583,2335,2015],{"class":2014},[1583,2337,1757],{"class":1608},[1583,2339,2340,2343,2345,2347,2349,2351],{"class":1585,"line":1643},[1583,2341,2342],{"class":2330},"    tag",[1583,2344,1766],{"class":1608},[1583,2346,2025],{"class":1608},[1583,2348,2029],{"class":2028},[1583,2350,2032],{"class":1608},[1583,2352,1757],{"class":1608},[1583,2354,2355,2358,2360,2362,2365,2368,2370,2372,2375,2377,2379,2382,2384,2386,2388,2390,2393,2395],{"class":1585,"line":1649},[1583,2356,2357],{"class":2330},"    attrsList",[1583,2359,1766],{"class":1608},[1583,2361,2042],{"class":1664},[1583,2363,2364],{"class":1608},"{",[1583,2366,2367],{"class":1664}," name",[1583,2369,1766],{"class":1608},[1583,2371,2025],{"class":1608},[1583,2373,2374],{"class":2028},"id",[1583,2376,2032],{"class":1608},[1583,2378,1631],{"class":1608},[1583,2380,2381],{"class":1664}," value",[1583,2383,1766],{"class":1608},[1583,2385,2025],{"class":1608},[1583,2387,2276],{"class":2028},[1583,2389,2032],{"class":1608},[1583,2391,2392],{"class":1608}," }",[1583,2394,2048],{"class":1664},[1583,2396,1757],{"class":1608},[1583,2398,2399,2402,2404],{"class":1585,"line":1687},[1583,2400,2401],{"class":2330},"    children",[1583,2403,1766],{"class":1608},[1583,2405,2406],{"class":1664}," [\n",[1583,2408,2409],{"class":1585,"line":1693},[1583,2410,2411],{"class":1608},"        {\n",[1583,2413,2414,2417,2419,2421],{"class":1585,"line":1712},[1583,2415,2416],{"class":1664},"            type",[1583,2418,1766],{"class":1608},[1583,2420,2015],{"class":2014},[1583,2422,1757],{"class":1608},[1583,2424,2425,2428,2430,2432,2434,2436],{"class":1585,"line":1718},[1583,2426,2427],{"class":1664},"            tag",[1583,2429,1766],{"class":1608},[1583,2431,2025],{"class":1608},[1583,2433,1531],{"class":2028},[1583,2435,2032],{"class":1608},[1583,2437,1757],{"class":1608},[1583,2439,2440,2443,2445],{"class":1585,"line":1743},[1583,2441,2442],{"class":1664},"            children",[1583,2444,1766],{"class":1608},[1583,2446,2406],{"class":1664},[1583,2448,2449,2452,2454,2456,2459,2461,2464,2466,2468,2471,2473,2475,2478,2480,2482,2484,2486],{"class":1585,"line":1751},[1583,2450,2451],{"class":1608},"                {",[1583,2453,2009],{"class":1664},[1583,2455,1766],{"class":1608},[1583,2457,2458],{"class":2014}," 2",[1583,2460,1631],{"class":1608},[1583,2462,2463],{"class":1664}," expression",[1583,2465,1766],{"class":1608},[1583,2467,2025],{"class":1608},[1583,2469,2470],{"class":2028},"_s(message)",[1583,2472,2032],{"class":1608},[1583,2474,1631],{"class":1608},[1583,2476,2477],{"class":1664}," text",[1583,2479,1766],{"class":1608},[1583,2481,2025],{"class":1608},[1583,2483,1542],{"class":2028},[1583,2485,2032],{"class":1608},[1583,2487,2488],{"class":1608}," },\n",[1583,2490,2491,2494],{"class":1585,"line":1760},[1583,2492,2493],{"class":1664},"            ]",[1583,2495,1757],{"class":1608},[1583,2497,2498],{"class":1585,"line":1778},[1583,2499,2500],{"class":1608},"        },\n",[1583,2502,2503,2506,2508,2510,2513,2515,2517,2519,2521,2523,2525],{"class":1585,"line":1784},[1583,2504,2505],{"class":1608},"        {",[1583,2507,2009],{"class":1664},[1583,2509,1766],{"class":1608},[1583,2511,2512],{"class":2014}," 3",[1583,2514,1631],{"class":1608},[1583,2516,2477],{"class":1664},[1583,2518,1766],{"class":1608},[1583,2520,2025],{"class":1608},[1583,2522,2244],{"class":2028},[1583,2524,2032],{"class":1608},[1583,2526,2488],{"class":1608},[1583,2528,2529,2532],{"class":1585,"line":2087},[1583,2530,2531],{"class":1664},"    ]",[1583,2533,1757],{"class":1608},[1583,2535,2536],{"class":1585,"line":2093},[1583,2537,2163],{"class":1608},[1531,2539,2540,2541,2544],{},"可以看到 AST 就是一棵普通的 JS 对象树，",[1549,2542,2543],{},"模板里的嵌套结构变成了对象的 children 嵌套","，每个节点都记录了标签名、属性、文本或表达式。",[1560,2546],{},[1526,2548,2550],{"id":2549},"optimize标记静态节点","✨ optimize：标记静态节点",[1531,2552,2553,2554,2557,2558,1551],{},"optimize 的源码在 ",[1540,2555,2556],{},"src/compiler/optimizer.js","，做的事情只有一件：",[1549,2559,2560,2561,2564],{},"递归遍历 AST，给不依赖响应式数据的节点打上 ",[1540,2562,2563],{},"static: true"," 标记",[1531,2566,2567,2568,2571,2572,2575,2576,2579],{},"什么叫\"静态\"？就是这个节点的内容",[1549,2569,2570],{},"永远不会因为数据变化而改变","。比如 ",[1540,2573,2574],{},"\u003Cp>hello\u003C/p>","，无论 ",[1540,2577,2578],{},"message"," 怎么变，它都长这样，这就是静态节点。",[1531,2581,2582],{},"简化后的核心逻辑：",[1574,2584,2586],{"className":1576,"code":2585,"filename":2556,"language":1578,"meta":1579,"style":1579},"// 简化自 src/compiler/optimizer.js\nfunction optimize(root) {\n    markStatic(root);\n}\n\nfunction markStatic(node) {\n    // 纯文本节点、没有动态绑定的元素 → 静态\n    node.static = isStatic(node);\n    if (node.type === 1) {\n        for (const child of node.children) {\n            markStatic(child);\n            // 只要有一个子节点是动态的，父元素就不是静态的\n            if (!child.static) node.static = false;\n        }\n    }\n}\n\nfunction isStatic(node) {\n    if (node.type === 2) return false; // 带表达式的文本，动态\n    if (node.type === 3) return true; // 纯文本，静态\n    // 元素节点：没有 v-if、v-for、动态绑定等才是静态\n    return !node.if && !node.for && !node.hasBindings /* ... */;\n}\n",[1540,2587,2588,2593,2608,2621,2625,2629,2645,2650,2673,2695,2723,2737,2742,2772,2776,2780,2784,2788,2802,2830,2858,2863,2905],{"__ignoreMap":1579},[1583,2589,2590],{"class":1585,"line":1586},[1583,2591,2592],{"class":1589},"// 简化自 src/compiler/optimizer.js\n",[1583,2594,2595,2597,2600,2602,2604,2606],{"class":1585,"line":1593},[1583,2596,1619],{"class":1600},[1583,2598,2599],{"class":1612}," optimize",[1583,2601,1616],{"class":1608},[1583,2603,2074],{"class":1627},[1583,2605,1637],{"class":1608},[1583,2607,1640],{"class":1608},[1583,2609,2610,2613,2615,2617,2619],{"class":1585,"line":1643},[1583,2611,2612],{"class":1612},"    markStatic",[1583,2614,1616],{"class":1664},[1583,2616,2074],{"class":1604},[1583,2618,1637],{"class":1664},[1583,2620,1684],{"class":1608},[1583,2622,2623],{"class":1585,"line":1649},[1583,2624,2163],{"class":1608},[1583,2626,2627],{"class":1585,"line":1687},[1583,2628,1915],{"emptyLinePlaceholder":1914},[1583,2630,2631,2633,2636,2638,2641,2643],{"class":1585,"line":1693},[1583,2632,1619],{"class":1600},[1583,2634,2635],{"class":1612}," markStatic",[1583,2637,1616],{"class":1608},[1583,2639,2640],{"class":1627},"node",[1583,2642,1637],{"class":1608},[1583,2644,1640],{"class":1608},[1583,2646,2647],{"class":1585,"line":1712},[1583,2648,2649],{"class":1589},"    // 纯文本节点、没有动态绑定的元素 → 静态\n",[1583,2651,2652,2655,2657,2660,2662,2665,2667,2669,2671],{"class":1585,"line":1718},[1583,2653,2654],{"class":1604},"    node",[1583,2656,1669],{"class":1608},[1583,2658,2659],{"class":1604},"static",[1583,2661,1658],{"class":1608},[1583,2663,2664],{"class":1612}," isStatic",[1583,2666,1616],{"class":1664},[1583,2668,2640],{"class":1604},[1583,2670,1637],{"class":1664},[1583,2672,1684],{"class":1608},[1583,2674,2675,2678,2680,2682,2684,2686,2689,2691,2693],{"class":1585,"line":1743},[1583,2676,2677],{"class":1596},"    if",[1583,2679,1923],{"class":1664},[1583,2681,2640],{"class":1604},[1583,2683,1669],{"class":1608},[1583,2685,2180],{"class":1604},[1583,2687,2688],{"class":1608}," ===",[1583,2690,2015],{"class":2014},[1583,2692,1928],{"class":1664},[1583,2694,1931],{"class":1608},[1583,2696,2697,2700,2702,2705,2708,2711,2714,2716,2719,2721],{"class":1585,"line":1751},[1583,2698,2699],{"class":1596},"        for",[1583,2701,1923],{"class":1664},[1583,2703,2704],{"class":1600},"const",[1583,2706,2707],{"class":1604}," child",[1583,2709,2710],{"class":1608}," of",[1583,2712,2713],{"class":1604}," node",[1583,2715,1669],{"class":1608},[1583,2717,2718],{"class":1604},"children",[1583,2720,1928],{"class":1664},[1583,2722,1931],{"class":1608},[1583,2724,2725,2728,2730,2733,2735],{"class":1585,"line":1760},[1583,2726,2727],{"class":1612},"            markStatic",[1583,2729,1616],{"class":1664},[1583,2731,2732],{"class":1604},"child",[1583,2734,1637],{"class":1664},[1583,2736,1684],{"class":1608},[1583,2738,2739],{"class":1585,"line":1778},[1583,2740,2741],{"class":1589},"            // 只要有一个子节点是动态的，父元素就不是静态的\n",[1583,2743,2744,2746,2748,2750,2752,2754,2756,2758,2760,2762,2764,2766,2770],{"class":1585,"line":1784},[1583,2745,2066],{"class":1596},[1583,2747,1923],{"class":1664},[1583,2749,2071],{"class":1608},[1583,2751,2732],{"class":1604},[1583,2753,1669],{"class":1608},[1583,2755,2659],{"class":1604},[1583,2757,1928],{"class":1664},[1583,2759,2640],{"class":1604},[1583,2761,1669],{"class":1608},[1583,2763,2659],{"class":1604},[1583,2765,1658],{"class":1608},[1583,2767,2769],{"class":2768},"sPKOg"," false",[1583,2771,1684],{"class":1608},[1583,2773,2774],{"class":1585,"line":2087},[1583,2775,2136],{"class":1608},[1583,2777,2778],{"class":1585,"line":2093},[1583,2779,2148],{"class":1608},[1583,2781,2782],{"class":1585,"line":2112},[1583,2783,2163],{"class":1608},[1583,2785,2786],{"class":1585,"line":2121},[1583,2787,1915],{"emptyLinePlaceholder":1914},[1583,2789,2790,2792,2794,2796,2798,2800],{"class":1585,"line":2127},[1583,2791,1619],{"class":1600},[1583,2793,2664],{"class":1612},[1583,2795,1616],{"class":1608},[1583,2797,2640],{"class":1627},[1583,2799,1637],{"class":1608},[1583,2801,1640],{"class":1608},[1583,2803,2804,2806,2808,2810,2812,2814,2816,2818,2820,2823,2825,2827],{"class":1585,"line":2133},[1583,2805,2677],{"class":1596},[1583,2807,1923],{"class":1664},[1583,2809,2640],{"class":1604},[1583,2811,1669],{"class":1608},[1583,2813,2180],{"class":1604},[1583,2815,2688],{"class":1608},[1583,2817,2458],{"class":2014},[1583,2819,1928],{"class":1664},[1583,2821,2822],{"class":1596},"return",[1583,2824,2769],{"class":2768},[1583,2826,1893],{"class":1608},[1583,2828,2829],{"class":1589}," // 带表达式的文本，动态\n",[1583,2831,2832,2834,2836,2838,2840,2842,2844,2846,2848,2850,2853,2855],{"class":1585,"line":2139},[1583,2833,2677],{"class":1596},[1583,2835,1923],{"class":1664},[1583,2837,2640],{"class":1604},[1583,2839,1669],{"class":1608},[1583,2841,2180],{"class":1604},[1583,2843,2688],{"class":1608},[1583,2845,2512],{"class":2014},[1583,2847,1928],{"class":1664},[1583,2849,2822],{"class":1596},[1583,2851,2852],{"class":2768}," true",[1583,2854,1893],{"class":1608},[1583,2856,2857],{"class":1589}," // 纯文本，静态\n",[1583,2859,2860],{"class":1585,"line":2145},[1583,2861,2862],{"class":1589},"    // 元素节点：没有 v-if、v-for、动态绑定等才是静态\n",[1583,2864,2865,2867,2870,2872,2874,2877,2880,2882,2884,2886,2889,2891,2893,2895,2897,2900,2903],{"class":1585,"line":2151},[1583,2866,1746],{"class":1596},[1583,2868,2869],{"class":1608}," !",[1583,2871,2640],{"class":1604},[1583,2873,1669],{"class":1608},[1583,2875,2876],{"class":1604},"if",[1583,2878,2879],{"class":1608}," &&",[1583,2881,2869],{"class":1608},[1583,2883,2640],{"class":1604},[1583,2885,1669],{"class":1608},[1583,2887,2888],{"class":1604},"for",[1583,2890,2879],{"class":1608},[1583,2892,2869],{"class":1608},[1583,2894,2640],{"class":1604},[1583,2896,1669],{"class":1608},[1583,2898,2899],{"class":1604},"hasBindings",[1583,2901,2902],{"class":1589}," /* ... */",[1583,2904,1684],{"class":1608},[1583,2906,2907],{"class":1585,"line":2160},[1583,2908,2163],{"class":1608},[1531,2910,2911,2912,2915,2916,2919],{},"另外还会标记",[1549,2913,2914],{},"静态根","（",[1540,2917,2918],{},"staticRoot","）：一个静态节点如果本身有子节点、且不是只有一个文本子节点，就可以作为静态根。",[2171,2921,2922],{"id":2922},"标记了有什么用",[1531,2924,2925],{},"这些标记是给后面的 patch 阶段用的：",[1796,2927,2928,2934],{},[1799,2929,2930,2933],{},[1549,2931,2932],{},"静态子树直接跳过","：数据变化触发重新渲染时，patch 发现新旧节点都是静态的，就不用对比它们的子树了，整棵跳过。",[1799,2935,2936,2939],{},[1549,2937,2938],{},"静态节点可缓存复用","：静态内容渲染一次后可以缓存起来，下次直接复用，不用重新创建。",[1531,2941,2942,2943,2946,2947,2950],{},"也就是说，optimize 是在编译期提前做功课，",[1549,2944,2945],{},"把\"哪些部分永远不变\"这个信息算好存起来","，让运行时的 Diff 少干活。这和我们在 ",[1535,2948,2949],{"href":936},"Snabbdom 课程"," 里看到的\"逐节点对比\"形成互补：Vue 先用编译时信息剪枝，再做运行时对比。",[1560,2952],{},[1526,2954,2956],{"id":2955},"generateast-render-代码","🛠 generate：AST → render 代码",[1531,2958,2959,2960,2963,2964,2967],{},"generate 的源码在 ",[1540,2961,2962],{},"src/compiler/codegen/index.js","，负责把 AST ",[1549,2965,2966],{},"转成一串代码字符串","。还是上面的例子：",[1574,2969,2970],{"className":2254,"code":2255,"language":2256,"meta":1579,"style":1579},[1540,2971,2972,2990,3006,3010],{"__ignoreMap":1579},[1583,2973,2974,2976,2978,2980,2982,2984,2986,2988],{"class":1585,"line":1586},[1583,2975,2263],{"class":1608},[1583,2977,2029],{"class":1664},[1583,2979,2268],{"class":1600},[1583,2981,1609],{"class":1608},[1583,2983,2273],{"class":1608},[1583,2985,2276],{"class":2028},[1583,2987,2273],{"class":1608},[1583,2989,2281],{"class":1608},[1583,2991,2992,2994,2996,2998,3000,3002,3004],{"class":1585,"line":1593},[1583,2993,2286],{"class":1608},[1583,2995,1531],{"class":1664},[1583,2997,2291],{"class":1608},[1583,2999,1542],{"class":1604},[1583,3001,2296],{"class":1608},[1583,3003,1531],{"class":1664},[1583,3005,2281],{"class":1608},[1583,3007,3008],{"class":1585,"line":1643},[1583,3009,2305],{"class":1604},[1583,3011,3012,3014,3016],{"class":1585,"line":1649},[1583,3013,2296],{"class":1608},[1583,3015,2029],{"class":1664},[1583,3017,2281],{"class":1608},[1531,3019,3020],{},"生成结果大致是：",[1574,3022,3024],{"className":1576,"code":3023,"language":1578,"meta":1579,"style":1579},"with (this) {\n    return _c('div', { attrs: { id: 'app' } }, [_c('p', [_v(_s(message))]), _v('hello')]);\n}\n",[1540,3025,3026,3040,3131],{"__ignoreMap":1579},[1583,3027,3028,3031,3033,3036,3038],{"class":1585,"line":1586},[1583,3029,3030],{"class":1596},"with",[1583,3032,1923],{"class":1604},[1583,3034,3035],{"class":1608},"this",[1583,3037,1928],{"class":1604},[1583,3039,1931],{"class":1608},[1583,3041,3042,3044,3047,3049,3051,3053,3055,3057,3059,3062,3064,3066,3068,3070,3072,3074,3076,3078,3081,3083,3086,3088,3090,3092,3094,3096,3098,3101,3103,3106,3108,3110,3113,3115,3118,3120,3122,3124,3126,3129],{"class":1585,"line":1593},[1583,3043,1746],{"class":1596},[1583,3045,3046],{"class":1612}," _c",[1583,3048,1616],{"class":1664},[1583,3050,2032],{"class":1608},[1583,3052,2029],{"class":2028},[1583,3054,2032],{"class":1608},[1583,3056,1631],{"class":1608},[1583,3058,2006],{"class":1608},[1583,3060,3061],{"class":1664}," attrs",[1583,3063,1766],{"class":1608},[1583,3065,2006],{"class":1608},[1583,3067,2268],{"class":1664},[1583,3069,1766],{"class":1608},[1583,3071,2025],{"class":1608},[1583,3073,2276],{"class":2028},[1583,3075,2032],{"class":1608},[1583,3077,2392],{"class":1608},[1583,3079,3080],{"class":1608}," },",[1583,3082,2042],{"class":1664},[1583,3084,3085],{"class":1612},"_c",[1583,3087,1616],{"class":1664},[1583,3089,2032],{"class":1608},[1583,3091,1531],{"class":2028},[1583,3093,2032],{"class":1608},[1583,3095,1631],{"class":1608},[1583,3097,2042],{"class":1664},[1583,3099,3100],{"class":1612},"_v",[1583,3102,1616],{"class":1664},[1583,3104,3105],{"class":1612},"_s",[1583,3107,1616],{"class":1664},[1583,3109,2578],{"class":1604},[1583,3111,3112],{"class":1664},"))])",[1583,3114,1631],{"class":1608},[1583,3116,3117],{"class":1612}," _v",[1583,3119,1616],{"class":1664},[1583,3121,2032],{"class":1608},[1583,3123,2244],{"class":2028},[1583,3125,2032],{"class":1608},[1583,3127,3128],{"class":1664},")])",[1583,3130,1684],{"class":1608},[1583,3132,3133],{"class":1585,"line":1643},[1583,3134,2163],{"class":1608},[1531,3136,3137,3138,3140],{},"这串字符串再经过 ",[1540,3139,1823],{}," 包装，就变成了真正的 render 函数。执行后返回一棵虚拟节点树（vnode），交给 patch 渲染成真实 DOM。",[2171,3142,3143],{"id":3143},"常用的渲染辅助函数",[1531,3145,3146,3147,1543,3149,1543,3151,3153],{},"代码里的 ",[1540,3148,3085],{},[1540,3150,3100],{},[1540,3152,3105],{}," 不是编译器发明的黑话，而是 Vue 挂在组件实例上的一组辅助函数的简写：",[2183,3155,3156,3169],{},[2186,3157,3158],{},[2189,3159,3160,3163,3166],{},[2192,3161,3162],{},"简写",[2192,3164,3165],{},"完整函数",[2192,3167,3168],{},"作用",[2201,3170,3171,3186,3198,3216],{},[2189,3172,3173,3177,3180],{},[2206,3174,3175],{},[1540,3176,3085],{},[2206,3178,3179],{},"createElement",[2206,3181,3182,3183],{},"创建元素节点的 vnode，对应 Snabbdom 的 ",[1540,3184,3185],{},"h()",[2189,3187,3188,3192,3195],{},[2206,3189,3190],{},[1540,3191,3100],{},[2206,3193,3194],{},"createTextVNode",[2206,3196,3197],{},"创建文本节点的 vnode",[2189,3199,3200,3204,3207],{},[2206,3201,3202],{},[1540,3203,3105],{},[2206,3205,3206],{},"toString",[2206,3208,3209,3210,3212,3213,3215],{},"把值转成字符串（",[1540,3211,1542],{}," 编译成 ",[1540,3214,2470],{},"）",[2189,3217,3218,3223,3226],{},[2206,3219,3220],{},[1540,3221,3222],{},"_l",[2206,3224,3225],{},"renderList",[2206,3227,3228,3229,3231,3232,3234],{},"渲染列表，",[1540,3230,1546],{}," 会编译成 ",[1540,3233,3222],{}," 的循环",[1531,3236,3237,3238,3240],{},"比如一个 ",[1540,3239,1546],{}," 模板：",[1574,3242,3244],{"className":2254,"code":3243,"language":2256,"meta":1579,"style":1579},"\u003Cul>\n    \u003Cli v-for=\"item in list\">{{ item.name }}\u003C/li>\n\u003C/ul>\n",[1540,3245,3246,3254,3283],{"__ignoreMap":1579},[1583,3247,3248,3250,3252],{"class":1585,"line":1586},[1583,3249,2263],{"class":1608},[1583,3251,1796],{"class":1664},[1583,3253,2281],{"class":1608},[1583,3255,3256,3258,3260,3263,3265,3267,3270,3272,3274,3277,3279,3281],{"class":1585,"line":1593},[1583,3257,2286],{"class":1608},[1583,3259,1799],{"class":1664},[1583,3261,3262],{"class":1600}," v-for",[1583,3264,1609],{"class":1608},[1583,3266,2273],{"class":1608},[1583,3268,3269],{"class":2028},"item in list",[1583,3271,2273],{"class":1608},[1583,3273,2291],{"class":1608},[1583,3275,3276],{"class":1604},"{{ item.name }}",[1583,3278,2296],{"class":1608},[1583,3280,1799],{"class":1664},[1583,3282,2281],{"class":1608},[1583,3284,3285,3287,3289],{"class":1585,"line":1643},[1583,3286,2296],{"class":1608},[1583,3288,1796],{"class":1664},[1583,3290,2281],{"class":1608},[1531,3292,3293],{},"编译后大致是：",[1574,3295,3297],{"className":1576,"code":3296,"language":1578,"meta":1579,"style":1579},"with (this) {\n    return _c('ul', _l(list, function (item) {\n        return _c('li', [_v(_s(item.name))]);\n    }));\n}\n",[1540,3298,3299,3311,3349,3387,3397],{"__ignoreMap":1579},[1583,3300,3301,3303,3305,3307,3309],{"class":1585,"line":1586},[1583,3302,3030],{"class":1596},[1583,3304,1923],{"class":1604},[1583,3306,3035],{"class":1608},[1583,3308,1928],{"class":1604},[1583,3310,1931],{"class":1608},[1583,3312,3313,3315,3317,3319,3321,3323,3325,3327,3330,3332,3335,3337,3340,3342,3345,3347],{"class":1585,"line":1593},[1583,3314,1746],{"class":1596},[1583,3316,3046],{"class":1612},[1583,3318,1616],{"class":1664},[1583,3320,2032],{"class":1608},[1583,3322,1796],{"class":2028},[1583,3324,2032],{"class":1608},[1583,3326,1631],{"class":1608},[1583,3328,3329],{"class":1612}," _l",[1583,3331,1616],{"class":1664},[1583,3333,3334],{"class":1604},"list",[1583,3336,1631],{"class":1608},[1583,3338,3339],{"class":1600}," function",[1583,3341,1923],{"class":1608},[1583,3343,3344],{"class":1627},"item",[1583,3346,1637],{"class":1608},[1583,3348,1640],{"class":1608},[1583,3350,3351,3354,3356,3358,3360,3362,3364,3366,3368,3370,3372,3374,3376,3378,3380,3383,3385],{"class":1585,"line":1643},[1583,3352,3353],{"class":1596},"        return",[1583,3355,3046],{"class":1612},[1583,3357,1616],{"class":1664},[1583,3359,2032],{"class":1608},[1583,3361,1799],{"class":2028},[1583,3363,2032],{"class":1608},[1583,3365,1631],{"class":1608},[1583,3367,2042],{"class":1664},[1583,3369,3100],{"class":1612},[1583,3371,1616],{"class":1664},[1583,3373,3105],{"class":1612},[1583,3375,1616],{"class":1664},[1583,3377,3344],{"class":1604},[1583,3379,1669],{"class":1608},[1583,3381,3382],{"class":1604},"name",[1583,3384,3112],{"class":1664},[1583,3386,1684],{"class":1608},[1583,3388,3389,3392,3395],{"class":1585,"line":1649},[1583,3390,3391],{"class":1608},"    }",[1583,3393,3394],{"class":1664},"))",[1583,3396,1684],{"class":1608},[1583,3398,3399],{"class":1585,"line":1687},[1583,3400,2163],{"class":1608},[1531,3402,3403,3406,3407,3409,3410,3412,3413,3415,3416,3418,3419,3421,3422,3425],{},[1540,3404,3405],{},"_l(list, fn)"," 会遍历 ",[1540,3408,3334],{},"，对每个 ",[1540,3411,3344],{}," 执行回调生成 vnode，最后收集成一个数组作为 ",[1540,3414,1796],{}," 的子节点。看到这里的 ",[1540,3417,3185],{}," 风格调用，是不是和 ",[1535,3420,2949],{"href":936}," 里手写的 ",[1540,3423,3424],{},"h('li', ...)"," 对上了？模板编译的最终产物，就是一棵用代码描述的虚拟 DOM。",[1560,3427],{},[1526,3429,3431],{"id":3430},"withthis-的作用","💡 with(this) 的作用",[1531,3433,3434,3435,3438,3439,1551],{},"你一定注意到了，生成的 render 函数外面包了一层 ",[1540,3436,3437],{},"with (this)","。它的作用是：",[1549,3440,3441,3442,3444],{},"把 ",[1540,3443,3035],{},"（组件实例）设为作用域查找的第一站",[1531,3446,3447,3448,3450,3451,3453,3454,3457,3458,3460,3461,1551],{},"有了它，模板里写的 ",[1540,3449,2578],{}," 在 render 函数里就会先去 ",[1540,3452,3035],{}," 上找，等价于 ",[1540,3455,3456],{},"this.message","。这就是为什么我们写模板时可以直接写 ",[1540,3459,1542],{},"，而不用写 ",[1540,3462,3463],{},"{{ this.message }}",[3465,3466,3467],"warning",{},[1531,3468,3469,3471,3472,3475,3476,1551],{},[1540,3470,3030],{}," 语句在 JavaScript 严格模式（",[1540,3473,3474],{},"'use strict'","）下是被禁用的，这也是 Vue2 模板编译生成的代码不使用严格模式的原因之一。Vue3 改用了其他方案，不再依赖 ",[1540,3477,3030],{},[1531,3479,3480,3481,3483],{},"另外 ",[1540,3482,3030],{}," 也有代价：它会让作用域查找变慢，而且变量来源不明确。不过模板里的变量一般就几个，实际影响有限。",[1560,3485],{},[1526,3487,3489],{"id":3488},"️-完整版-vs-runtime-only","⚖️ 完整版 vs runtime-only",[1531,3491,3492],{},"既然编译器能把模板转成 render 函数，那是不是每次运行都要编译一遍？不一定，这取决于你用的是哪个版本的 Vue。",[1531,3494,3495,3496,3499],{},"通过 npm 安装 Vue 时（本地环境：Node.js v22，",[1540,3497,3498],{},"vue@2.7.16","）：",[1574,3501,3505],{"className":3502,"code":3503,"language":3504,"meta":1579,"style":1579},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","# Node.js v22\nnpm install vue@2.7.16\n","bash",[1540,3506,3507,3512],{"__ignoreMap":1579},[1583,3508,3509],{"class":1585,"line":1586},[1583,3510,3511],{"class":1589},"# Node.js v22\n",[1583,3513,3514,3517,3520],{"class":1585,"line":1593},[1583,3515,3516],{"class":2330},"npm",[1583,3518,3519],{"class":2028}," install",[1583,3521,3522],{"class":2028}," vue@2.7.16\n",[1531,3524,3525,3526,3529,3530,3533,3534,3537,3538,3541,3542,3545,3546,3549],{},"默认导出的构建（",[1540,3527,3528],{},"vue.runtime.common.js"," / 打包工具默认解析的 ",[1540,3531,3532],{},"vue.runtime.esm.js","）是 ",[1549,3535,3536],{},"runtime-only 版，不含模板编译器","。它假设你的模板已经在构建阶段被 ",[1540,3539,3540],{},"vue-loader","（处理 ",[1540,3543,3544],{},".vue"," 文件）或 ",[1540,3547,3548],{},"vue-template-compiler"," 提前编译成了 render 函数，运行时只管渲染，体积更小。",[1531,3551,3552,3553,2915,3556,3559,3560,3562,3563,3566],{},"只有显式引用",[1549,3554,3555],{},"完整版",[1540,3557,3558],{},"vue/dist/vue.js","，编译器 + 运行时），才能在浏览器里实时编译 ",[1540,3561,1628],{}," 选项或 ",[1540,3564,3565],{},"el"," 挂载点的 HTML：",[1574,3568,3570],{"className":1576,"code":3569,"language":1578,"meta":1579,"style":1579},"// 完整版才能这样用：运行时编译 template\nnew Vue({\n    el: '#app',\n    template: '\u003Cdiv>{{ message }}\u003C/div>',\n    data: { message: 'hello' },\n});\n",[1540,3571,3572,3577,3589,3605,3620,3642],{"__ignoreMap":1579},[1583,3573,3574],{"class":1585,"line":1586},[1583,3575,3576],{"class":1589},"// 完整版才能这样用：运行时编译 template\n",[1583,3578,3579,3582,3585,3587],{"class":1585,"line":1593},[1583,3580,3581],{"class":1608},"new",[1583,3583,3584],{"class":1612}," Vue",[1583,3586,1616],{"class":1604},[1583,3588,1931],{"class":1608},[1583,3590,3591,3594,3596,3598,3601,3603],{"class":1585,"line":1643},[1583,3592,3593],{"class":1664},"    el",[1583,3595,1766],{"class":1608},[1583,3597,2025],{"class":1608},[1583,3599,3600],{"class":2028},"#app",[1583,3602,2032],{"class":1608},[1583,3604,1757],{"class":1608},[1583,3606,3607,3610,3612,3614,3616,3618],{"class":1585,"line":1649},[1583,3608,3609],{"class":1664},"    template",[1583,3611,1766],{"class":1608},[1583,3613,2025],{"class":1608},[1583,3615,1557],{"class":2028},[1583,3617,2032],{"class":1608},[1583,3619,1757],{"class":1608},[1583,3621,3622,3625,3627,3629,3632,3634,3636,3638,3640],{"class":1585,"line":1687},[1583,3623,3624],{"class":1664},"    data",[1583,3626,1766],{"class":1608},[1583,3628,2006],{"class":1608},[1583,3630,3631],{"class":1664}," message",[1583,3633,1766],{"class":1608},[1583,3635,2025],{"class":1608},[1583,3637,2244],{"class":2028},[1583,3639,2032],{"class":1608},[1583,3641,2488],{"class":1608},[1583,3643,3644,3646,3648],{"class":1585,"line":1693},[1583,3645,1787],{"class":1608},[1583,3647,1637],{"class":1604},[1583,3649,1684],{"class":1608},[3651,3652,3653],"tip",{},[1531,3654,3655,3656,3658,3659,3662],{},"实际项目里基本都走构建工具，模板在打包时就被编译好了，所以默认用 runtime-only 版即可。这也是为什么你在 ",[1540,3657,3544],{}," 文件里写 ",[1540,3660,3661],{},"\u003Ctemplate>"," 不需要关心编译器：构建时已经替你编译完了。",[1531,3664,3665,3666,3669],{},"一句话总结：",[1549,3667,3668],{},"编译器和运行时是分开的","。完整版 = 运行时 + 编译器，可以随时编译模板；runtime-only 版 = 只有运行时，模板必须在构建时编译。",[1560,3671],{},[1526,3673,3675],{"id":3674},"小节总结","🧾 小节总结",[1796,3677,3678,3681,3684,3687,3706,3713],{},[1799,3679,3680],{},"模板编译分三步：parse（模板 → AST）、optimize（标记静态节点）、generate（AST → render 代码字符串）。",[1799,3682,3683],{},"parse 用正则逐段扫描模板，用栈维护父子关系，产出 AST；AST 节点分三种 type：1 元素、2 带表达式的文本、3 纯文本。",[1799,3685,3686],{},"optimize 标记不依赖响应式数据的静态节点和静态根，让 patch 时可以跳过或复用静态子树。",[1799,3688,3689,3690,3693,3694,3696,3697,3699,3700,3702,3703,3705],{},"generate 产出 ",[1540,3691,3692],{},"_c('div', [_v(_s(message))])"," 这样的代码字符串，",[1540,3695,3085],{}," 建元素、",[1540,3698,3100],{}," 建文本、",[1540,3701,3105],{}," 转字符串、",[1540,3704,3222],{}," 渲染列表。",[1799,3707,3708,3709,3712],{},"生成的 render 函数包在 ",[1540,3710,3711],{},"with(this)"," 里，所以模板中可以直接写变量名。",[1799,3714,3715,3716,3718,3719,1551],{},"npm 安装的 ",[1540,3717,3498],{}," 默认是 runtime-only 版（不含编译器），运行时编译模板需要完整版 ",[1540,3720,3558],{},[1560,3722],{},[1526,3724,3726],{"id":3725},"知识问答","❓ 知识问答",[1531,3728,3729],{},[1549,3730,3731],{},"Q1：AST 和虚拟 DOM（vnode）是一回事吗？",[1531,3733,3734],{},"A：不是。AST 是编译期的中间产物，描述模板的结构和表达式；vnode 是运行时的产物，由 render 函数执行后生成，描述要渲染的节点。流程是：模板 → AST → render 函数 → vnode → 真实 DOM。",[1531,3736,3737],{},[1549,3738,3739],{},"Q2：optimize 标记静态节点，是不是静态节点就不会出现在 vnode 里？",[1531,3741,3742],{},"A：会。静态节点照常生成 vnode、照常渲染，只是 patch 对比时认出它是静态的，就跳过子树的精细对比，并用缓存复用。标记是优化手段，不改变渲染结果。",[1531,3744,3745],{},[1549,3746,3747,3748,3750,3751,3753,3754,3756],{},"Q3：为什么 ",[1540,3749,1542],{}," 编译后是 ",[1540,3752,2470],{}," 而不是直接用 ",[1540,3755,2578],{},"？",[1531,3758,3759,3760,3762,3763,1551],{},"A：因为插值需要的是字符串。",[1540,3761,3105],{},"（toString）负责把数字、对象等各种类型安全地转成字符串，避免直接把对象拼进文本出现 ",[1540,3764,3765],{},"[object Object]",[1531,3767,3768],{},[1549,3769,3770,3771,3773],{},"Q4：runtime-only 版遇到 ",[1540,3772,1628],{}," 选项会直接报错吗？",[1531,3775,3776,3777,3779],{},"A：在开发环境下，runtime-only 版检测到传入了 ",[1540,3778,1628],{}," 且没有对应 render 函数时，会给出警告提示你改用完整版或改用 render 函数。正常走构建工具的项目不会遇到这个问题，因为模板早已被编译。",[1531,3781,3782],{},[1549,3783,3784],{},"Q5：模板编译发生在什么时候？",[1531,3786,3787,3788,3791],{},"A：看版本。完整版在浏览器运行 ",[1540,3789,3790],{},"new Vue"," 时实时编译；runtime-only 版的项目里，编译发生在打包构建阶段（由 vue-loader 完成），浏览器拿到的已经是 render 函数。",[1560,3793],{},[1526,3795,3797],{"id":3796},"小练习","🧪 小练习",[1531,3799,3800,3801,1543,3803,1543,3805,1543,3807,3499],{},"不看上文，手写下面这个模板编译后的 render 代码（用 ",[1540,3802,3085],{},[1540,3804,3222],{},[1540,3806,3100],{},[1540,3808,3105],{},[1574,3810,3812],{"className":2254,"code":3811,"language":2256,"meta":1579,"style":1579},"\u003Cdiv>\n    \u003Ch1>{{ title }}\u003C/h1>\n    \u003Cul>\n        \u003Cli v-for=\"todo in todos\">{{ todo.text }}\u003C/li>\n    \u003C/ul>\n\u003C/div>\n",[1540,3813,3814,3822,3840,3848,3877,3886],{"__ignoreMap":1579},[1583,3815,3816,3818,3820],{"class":1585,"line":1586},[1583,3817,2263],{"class":1608},[1583,3819,2029],{"class":1664},[1583,3821,2281],{"class":1608},[1583,3823,3824,3826,3829,3831,3834,3836,3838],{"class":1585,"line":1593},[1583,3825,2286],{"class":1608},[1583,3827,3828],{"class":1664},"h1",[1583,3830,2291],{"class":1608},[1583,3832,3833],{"class":1604},"{{ title }}",[1583,3835,2296],{"class":1608},[1583,3837,3828],{"class":1664},[1583,3839,2281],{"class":1608},[1583,3841,3842,3844,3846],{"class":1585,"line":1643},[1583,3843,2286],{"class":1608},[1583,3845,1796],{"class":1664},[1583,3847,2281],{"class":1608},[1583,3849,3850,3853,3855,3857,3859,3861,3864,3866,3868,3871,3873,3875],{"class":1585,"line":1649},[1583,3851,3852],{"class":1608},"        \u003C",[1583,3854,1799],{"class":1664},[1583,3856,3262],{"class":1600},[1583,3858,1609],{"class":1608},[1583,3860,2273],{"class":1608},[1583,3862,3863],{"class":2028},"todo in todos",[1583,3865,2273],{"class":1608},[1583,3867,2291],{"class":1608},[1583,3869,3870],{"class":1604},"{{ todo.text }}",[1583,3872,2296],{"class":1608},[1583,3874,1799],{"class":1664},[1583,3876,2281],{"class":1608},[1583,3878,3879,3882,3884],{"class":1585,"line":1687},[1583,3880,3881],{"class":1608},"    \u003C/",[1583,3883,1796],{"class":1664},[1583,3885,2281],{"class":1608},[1583,3887,3888,3890,3892],{"class":1585,"line":1693},[1583,3889,2296],{"class":1608},[1583,3891,2029],{"class":1664},[1583,3893,2281],{"class":1608},[1574,3895,3897],{"className":1576,"code":3896,"language":1578,"meta":1579,"style":1579},"with (this) {\n    // 请在这里编写代码\n}\n",[1540,3898,3899,3911,3916],{"__ignoreMap":1579},[1583,3900,3901,3903,3905,3907,3909],{"class":1585,"line":1586},[1583,3902,3030],{"class":1596},[1583,3904,1923],{"class":1604},[1583,3906,3035],{"class":1608},[1583,3908,1928],{"class":1604},[1583,3910,1931],{"class":1608},[1583,3912,3913],{"class":1585,"line":1593},[1583,3914,3915],{"class":1589},"    // 请在这里编写代码\n",[1583,3917,3918],{"class":1585,"line":1643},[1583,3919,2163],{"class":1608},[1531,3921,3922,3923,3925,3926,3929,3930,3932,3933,3936,3937,1551],{},"写完后对照检查：",[1540,3924,3828],{}," 里的插值用 ",[1540,3927,3928],{},"_v(_s(title))","；",[1540,3931,1796],{}," 的第二个参数是 ",[1540,3934,3935],{},"_l(todos, function (todo) { ... })","，回调里返回 ",[1540,3938,3939],{},"_c('li', [_v(_s(todo.text))])",[1560,3941],{},[1531,3943,3944],{},"🎉 恭喜你已经掌握了模板编译的完整流程！从模板字符串到 AST，再到 render 函数，Vue 的\"模板魔法\"其实就是这三步踏实的转换。",[3946,3947,3948],"style",{},"html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sK9QF, html code.shiki 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pre.shiki code .sPKOg, html code.shiki .sPKOg{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}",{"title":1579,"searchDepth":1593,"depth":1593,"links":3950},[3951,3952,3953,3957,3960,3963,3964,3965,3966,3967],{"id":1528,"depth":1593,"text":1529},{"id":1564,"depth":1593,"text":1565},{"id":1835,"depth":1593,"text":1836,"children":3954},[3955,3956],{"id":2173,"depth":1643,"text":2174},{"id":2247,"depth":1643,"text":2248},{"id":2549,"depth":1593,"text":2550,"children":3958},[3959],{"id":2922,"depth":1643,"text":2922},{"id":2955,"depth":1593,"text":2956,"children":3961},[3962],{"id":3143,"depth":1643,"text":3143},{"id":3430,"depth":1593,"text":3431},{"id":3488,"depth":1593,"text":3489},{"id":3674,"depth":1593,"text":3675},{"id":3725,"depth":1593,"text":3726},{"id":3796,"depth":1593,"text":3797},"掌握模板编译 parse、optimize、generate 三个阶段，理解模板到 render 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