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Watcher 放进一个队列，等到当前事件循环快结束时，统一执行一次渲染。"," 这样 10 次修改合并成 1 次 DOM 更新，性能开销大幅降低。",[1531,1790,1791],{},"这就像一个快递柜：每来一个包裹就派一个快递员跑一趟太浪费，不如攒一批，到点统一派送一次。",[1548,1793],{},[1526,1795,1797],{"id":1796},"️-queuewatcher入队与去重","⚙️ queueWatcher：入队与去重",[1531,1799,1800,1801,1804,1805,1808],{},"数据变化会触发 Watcher 的 ",[1543,1802,1803],{},"update()"," 方法。同步 Watcher（如计算属性）会直接重新求值，而渲染 Watcher 走的是 ",[1543,1806,1807],{},"queueWatcher","，进入异步队列。",[1531,1810,1811,1812,1815],{},"简化自 ",[1543,1813,1814],{},"src/core/observer/scheduler.js","：",[1558,1817,1821],{"className":1818,"code":1819,"language":1820,"meta":1564,"style":1564},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const queue = [];\nconst has = {}; // 记录已入队的 watcher id\nlet waiting = false;\n\nfunction queueWatcher(watcher) {\n    const id = watcher.id;\n\n    // 按 id 去重：同一个 watcher 一次事件循环只入队一次\n    if (has[id] == null) {\n        has[id] = true;\n        queue.push(watcher);\n\n        // 一次事件循环只注册一次 flush\n        if (!waiting) {\n            waiting = true;\n            nextTick(flushSchedulerQueue);\n        }\n    }\n}\n","js",[1543,1822,1823,1840,1856,1871,1875,1896,1917,1921,1926,1954,1972,1990,1994,1999,2016,2027,2041,2046,2052],{"__ignoreMap":1564},[1568,1824,1825,1828,1831,1834,1837],{"class":1570,"line":1571},[1568,1826,1827],{"class":1705},"const",[1568,1829,1830],{"class":1597}," queue ",[1568,1832,1833],{"class":1574},"=",[1568,1835,1836],{"class":1597}," []",[1568,1838,1839],{"class":1574},";\n",[1568,1841,1842,1844,1847,1849,1852],{"class":1570,"line":1585},[1568,1843,1827],{"class":1705},[1568,1845,1846],{"class":1597}," has ",[1568,1848,1833],{"class":1574},[1568,1850,1851],{"class":1574}," {};",[1568,1853,1855],{"class":1854},"syuKq"," // 记录已入队的 watcher id\n",[1568,1857,1858,1860,1863,1865,1869],{"class":1570,"line":1608},[1568,1859,1706],{"class":1705},[1568,1861,1862],{"class":1597}," waiting ",[1568,1864,1833],{"class":1574},[1568,1866,1868],{"class":1867},"sPKOg"," false",[1568,1870,1839],{"class":1574},[1568,1872,1873],{"class":1570,"line":1617},[1568,1874,1621],{"emptyLinePlaceholder":1620},[1568,1876,1877,1880,1884,1887,1891,1894],{"class":1570,"line":1624},[1568,1878,1879],{"class":1705},"function",[1568,1881,1883],{"class":1882},"swgpB"," queueWatcher",[1568,1885,1886],{"class":1574},"(",[1568,1888,1890],{"class":1889},"sK9QF","watcher",[1568,1892,1893],{"class":1574},")",[1568,1895,1644],{"class":1574},[1568,1897,1898,1901,1904,1906,1909,1912,1915],{"class":1570,"line":1634},[1568,1899,1900],{"class":1705},"    const",[1568,1902,1903],{"class":1597}," id",[1568,1905,1712],{"class":1574},[1568,1907,1908],{"class":1597}," watcher",[1568,1910,1911],{"class":1574},".",[1568,1913,1914],{"class":1597},"id",[1568,1916,1839],{"class":1574},[1568,1918,1919],{"class":1570,"line":1647},[1568,1920,1621],{"emptyLinePlaceholder":1620},[1568,1922,1923],{"class":1570,"line":1658},[1568,1924,1925],{"class":1854},"    // 按 id 去重：同一个 watcher 一次事件循环只入队一次\n",[1568,1927,1928,1931,1933,1936,1939,1941,1944,1947,1950,1952],{"class":1570,"line":1680},[1568,1929,1930],{"class":1637},"    if",[1568,1932,1702],{"class":1578},[1568,1934,1935],{"class":1597},"has",[1568,1937,1938],{"class":1578},"[",[1568,1940,1914],{"class":1597},[1568,1942,1943],{"class":1578},"] ",[1568,1945,1946],{"class":1574},"==",[1568,1948,1949],{"class":1574}," null",[1568,1951,1735],{"class":1578},[1568,1953,1738],{"class":1574},[1568,1955,1956,1959,1961,1963,1965,1967,1970],{"class":1570,"line":1686},[1568,1957,1958],{"class":1597},"        has",[1568,1960,1938],{"class":1578},[1568,1962,1914],{"class":1597},[1568,1964,1943],{"class":1578},[1568,1966,1833],{"class":1574},[1568,1968,1969],{"class":1867}," true",[1568,1971,1839],{"class":1574},[1568,1973,1974,1977,1979,1982,1984,1986,1988],{"class":1570,"line":1696},[1568,1975,1976],{"class":1597},"        queue",[1568,1978,1911],{"class":1574},[1568,1980,1981],{"class":1882},"push",[1568,1983,1886],{"class":1578},[1568,1985,1890],{"class":1597},[1568,1987,1893],{"class":1578},[1568,1989,1839],{"class":1574},[1568,1991,1992],{"class":1570,"line":1741},[1568,1993,1621],{"emptyLinePlaceholder":1620},[1568,1995,1996],{"class":1570,"line":1753},[1568,1997,1998],{"class":1854},"        // 一次事件循环只注册一次 flush\n",[1568,2000,2001,2004,2006,2009,2012,2014],{"class":1570,"line":1759},[1568,2002,2003],{"class":1637},"        if",[1568,2005,1702],{"class":1578},[1568,2007,2008],{"class":1574},"!",[1568,2010,2011],{"class":1597},"waiting",[1568,2013,1735],{"class":1578},[1568,2015,1738],{"class":1574},[1568,2017,2018,2021,2023,2025],{"class":1570,"line":1764},[1568,2019,2020],{"class":1597},"            waiting",[1568,2022,1712],{"class":1574},[1568,2024,1969],{"class":1867},[1568,2026,1839],{"class":1574},[1568,2028,2029,2032,2034,2037,2039],{"class":1570,"line":1770},[1568,2030,2031],{"class":1882},"            nextTick",[1568,2033,1886],{"class":1578},[1568,2035,2036],{"class":1597},"flushSchedulerQueue",[1568,2038,1893],{"class":1578},[1568,2040,1839],{"class":1574},[1568,2042,2044],{"class":1570,"line":2043},17,[1568,2045,1756],{"class":1574},[1568,2047,2049],{"class":1570,"line":2048},18,[1568,2050,2051],{"class":1574},"    }\n",[1568,2053,2055],{"class":1570,"line":2054},19,[1568,2056,2057],{"class":1574},"}\n",[1531,2059,2060,2061,1815],{},"这段代码有",[1538,2062,2063],{},"三个关键设计",[2065,2066,2067,2082,2094],"ul",{},[2068,2069,2070,1815,2075,2077,2078,2081],"li",{},[1538,2071,2072,2074],{},[1543,2073,1935],{}," 对象去重",[1543,2076,1747],{}," 改 10 次，触发的是同一个渲染 Watcher，",[1543,2079,2080],{},"has[id]"," 保证它只入队一次。这就是\"改 10 次只更新一次\"的直接原因。",[2068,2083,2084,2089,2090,2093],{},[1538,2085,2086,2088],{},[1543,2087,2011],{}," 标志","：保证一次事件循环里只调用一次 ",[1543,2091,2092],{},"nextTick(flushSchedulerQueue)","，避免重复注册刷新任务。",[2068,2095,2096,2102],{},[1538,2097,2098,2101],{},[1543,2099,2100],{},"nextTick"," 延迟执行","：把队列刷新推迟到当前同步代码执行完之后，让这一轮的所有数据修改都能攒进队列。",[1548,2104],{},[1526,2106,2108],{"id":2107},"flushschedulerqueue统一刷新","🛠 flushSchedulerQueue：统一刷新",[1531,2110,2111,2112,2114,2115,1815],{},"下一次事件循环到来时，",[1543,2113,2036],{}," 开始工作。简化自 ",[1543,2116,1814],{},[1558,2118,2120],{"className":1818,"code":2119,"language":1820,"meta":1564,"style":1564},"function flushSchedulerQueue() {\n    // 按 id 从小到大排序\n    queue.sort((a, b) => a.id - b.id);\n\n    for (let i = 0; i \u003C queue.length; i++) {\n        const watcher = queue[i];\n        has[watcher.id] = null;\n        watcher.run(); // 重新渲染并打补丁\n    }\n\n    // 重置状态，等待下一轮\n    queue.length = 0;\n    waiting = false;\n}\n",[1543,2121,2122,2133,2138,2186,2190,2229,2250,2269,2286,2290,2294,2299,2313,2324],{"__ignoreMap":1564},[1568,2123,2124,2126,2129,2131],{"class":1570,"line":1571},[1568,2125,1879],{"class":1705},[1568,2127,2128],{"class":1882}," flushSchedulerQueue",[1568,2130,1653],{"class":1574},[1568,2132,1644],{"class":1574},[1568,2134,2135],{"class":1570,"line":1585},[1568,2136,2137],{"class":1854},"    // 按 id 从小到大排序\n",[1568,2139,2140,2143,2145,2148,2150,2152,2155,2158,2161,2163,2166,2169,2171,2173,2176,2178,2180,2182,2184],{"class":1570,"line":1608},[1568,2141,2142],{"class":1597},"    queue",[1568,2144,1911],{"class":1574},[1568,2146,2147],{"class":1882},"sort",[1568,2149,1886],{"class":1578},[1568,2151,1886],{"class":1574},[1568,2153,2154],{"class":1889},"a",[1568,2156,2157],{"class":1574},",",[1568,2159,2160],{"class":1889}," b",[1568,2162,1893],{"class":1574},[1568,2164,2165],{"class":1705}," =>",[1568,2167,2168],{"class":1597}," a",[1568,2170,1911],{"class":1574},[1568,2172,1914],{"class":1597},[1568,2174,2175],{"class":1574}," -",[1568,2177,2160],{"class":1597},[1568,2179,1911],{"class":1574},[1568,2181,1914],{"class":1597},[1568,2183,1893],{"class":1578},[1568,2185,1839],{"class":1574},[1568,2187,2188],{"class":1570,"line":1617},[1568,2189,1621],{"emptyLinePlaceholder":1620},[1568,2191,2192,2195,2197,2199,2201,2203,2205,2207,2209,2211,2214,2216,2219,2221,2223,2225,2227],{"class":1570,"line":1624},[1568,2193,2194],{"class":1637},"    for",[1568,2196,1702],{"class":1578},[1568,2198,1706],{"class":1705},[1568,2200,1709],{"class":1597},[1568,2202,1712],{"class":1574},[1568,2204,1674],{"class":1673},[1568,2206,1717],{"class":1574},[1568,2208,1709],{"class":1597},[1568,2210,1722],{"class":1574},[1568,2212,2213],{"class":1597}," queue",[1568,2215,1911],{"class":1574},[1568,2217,2218],{"class":1597},"length",[1568,2220,1717],{"class":1574},[1568,2222,1709],{"class":1597},[1568,2224,1732],{"class":1574},[1568,2226,1735],{"class":1578},[1568,2228,1738],{"class":1574},[1568,2230,2231,2234,2236,2238,2240,2242,2245,2248],{"class":1570,"line":1634},[1568,2232,2233],{"class":1705},"        const",[1568,2235,1908],{"class":1597},[1568,2237,1712],{"class":1574},[1568,2239,2213],{"class":1597},[1568,2241,1938],{"class":1578},[1568,2243,2244],{"class":1597},"i",[1568,2246,2247],{"class":1578},"]",[1568,2249,1839],{"class":1574},[1568,2251,2252,2254,2256,2258,2260,2262,2264,2266],{"class":1570,"line":1647},[1568,2253,1958],{"class":1597},[1568,2255,1938],{"class":1578},[1568,2257,1890],{"class":1597},[1568,2259,1911],{"class":1574},[1568,2261,1914],{"class":1597},[1568,2263,1943],{"class":1578},[1568,2265,1833],{"class":1574},[1568,2267,2268],{"class":1574}," null;\n",[1568,2270,2271,2274,2276,2279,2281,2283],{"class":1570,"line":1658},[1568,2272,2273],{"class":1597},"        watcher",[1568,2275,1911],{"class":1574},[1568,2277,2278],{"class":1882},"run",[1568,2280,1653],{"class":1578},[1568,2282,1717],{"class":1574},[1568,2284,2285],{"class":1854}," // 重新渲染并打补丁\n",[1568,2287,2288],{"class":1570,"line":1680},[1568,2289,2051],{"class":1574},[1568,2291,2292],{"class":1570,"line":1686},[1568,2293,1621],{"emptyLinePlaceholder":1620},[1568,2295,2296],{"class":1570,"line":1696},[1568,2297,2298],{"class":1854},"    // 重置状态，等待下一轮\n",[1568,2300,2301,2303,2305,2307,2309,2311],{"class":1570,"line":1741},[1568,2302,2142],{"class":1597},[1568,2304,1911],{"class":1574},[1568,2306,2218],{"class":1597},[1568,2308,1712],{"class":1574},[1568,2310,1674],{"class":1673},[1568,2312,1839],{"class":1574},[1568,2314,2315,2318,2320,2322],{"class":1570,"line":1753},[1568,2316,2317],{"class":1597},"    waiting",[1568,2319,1712],{"class":1574},[1568,2321,1868],{"class":1867},[1568,2323,1839],{"class":1574},[1568,2325,2326],{"class":1570,"line":1759},[1568,2327,2057],{"class":1574},[1531,2329,2330],{},"两个细节值得注意：",[2065,2332,2333,2343],{},[2068,2334,2335,2338,2339,2342],{},[1538,2336,2337],{},"为什么要排序","：Watcher 的 id 是递增的，创建越早 id 越小。父组件的渲染 Watcher 先于子组件创建，排序保证",[1538,2340,2341],{},"父组件先更新、子组件后更新","，避免子组件被重复刷新。",[2068,2344,2345,2350,2351,2354,2355,2358],{},[1538,2346,2347],{},[1543,2348,2349],{},"watcher.run()","：真正执行渲染的地方，内部会调用 ",[1543,2352,2353],{},"vm._update(vm._render())","，走我们在 ",[2154,2356,2357],{"href":936},"Snabbdom 课程"," 里学过的虚拟 DOM Diff 流程。",[1531,2360,2361,2362,2368,2369,2371],{},"所有 Watcher 跑完之后，Vue 还会在这里统一调用各个组件的 ",[1538,2363,2364,2367],{},[1543,2365,2366],{},"updated"," 生命周期钩子","。所以在 ",[1543,2370,2366],{}," 里读到的 DOM 一定是最新的。",[1548,2373],{},[1526,2375,2377],{"id":2376},"nexttick-实现微任务优先","⚡ nextTick 实现：微任务优先",[1531,2379,2380,2381,2383,2384,1815],{},"现在轮到最后一块拼图：",[1543,2382,2100],{}," 是怎么\"推迟执行\"的？简化自 ",[1543,2385,2386],{},"src/core/util/next-tick.js",[1558,2388,2390],{"className":1818,"code":2389,"language":1820,"meta":1564,"style":1564},"const callbacks = [];\nlet pending = false;\nlet timerFunc;\n\nfunction nextTick(cb) {\n    callbacks.push(cb);\n\n    if (!pending) {\n        pending = true;\n        timerFunc();\n    }\n}\n\nfunction flushCallbacks() {\n    pending = false;\n    const cbs = callbacks.slice(0);\n    callbacks.length = 0;\n    for (let i = 0; i \u003C cbs.length; i++) {\n        cbs[i]();\n    }\n}\n",[1543,2391,2392,2405,2418,2427,2431,2447,2464,2468,2483,2494,2503,2507,2511,2515,2526,2537,2563,2577,2613,2627,2632],{"__ignoreMap":1564},[1568,2393,2394,2396,2399,2401,2403],{"class":1570,"line":1571},[1568,2395,1827],{"class":1705},[1568,2397,2398],{"class":1597}," callbacks ",[1568,2400,1833],{"class":1574},[1568,2402,1836],{"class":1597},[1568,2404,1839],{"class":1574},[1568,2406,2407,2409,2412,2414,2416],{"class":1570,"line":1585},[1568,2408,1706],{"class":1705},[1568,2410,2411],{"class":1597}," pending ",[1568,2413,1833],{"class":1574},[1568,2415,1868],{"class":1867},[1568,2417,1839],{"class":1574},[1568,2419,2420,2422,2425],{"class":1570,"line":1608},[1568,2421,1706],{"class":1705},[1568,2423,2424],{"class":1597}," timerFunc",[1568,2426,1839],{"class":1574},[1568,2428,2429],{"class":1570,"line":1617},[1568,2430,1621],{"emptyLinePlaceholder":1620},[1568,2432,2433,2435,2438,2440,2443,2445],{"class":1570,"line":1624},[1568,2434,1879],{"class":1705},[1568,2436,2437],{"class":1882}," nextTick",[1568,2439,1886],{"class":1574},[1568,2441,2442],{"class":1889},"cb",[1568,2444,1893],{"class":1574},[1568,2446,1644],{"class":1574},[1568,2448,2449,2452,2454,2456,2458,2460,2462],{"class":1570,"line":1634},[1568,2450,2451],{"class":1597},"    callbacks",[1568,2453,1911],{"class":1574},[1568,2455,1981],{"class":1882},[1568,2457,1886],{"class":1578},[1568,2459,2442],{"class":1597},[1568,2461,1893],{"class":1578},[1568,2463,1839],{"class":1574},[1568,2465,2466],{"class":1570,"line":1647},[1568,2467,1621],{"emptyLinePlaceholder":1620},[1568,2469,2470,2472,2474,2476,2479,2481],{"class":1570,"line":1658},[1568,2471,1930],{"class":1637},[1568,2473,1702],{"class":1578},[1568,2475,2008],{"class":1574},[1568,2477,2478],{"class":1597},"pending",[1568,2480,1735],{"class":1578},[1568,2482,1738],{"class":1574},[1568,2484,2485,2488,2490,2492],{"class":1570,"line":1680},[1568,2486,2487],{"class":1597},"        pending",[1568,2489,1712],{"class":1574},[1568,2491,1969],{"class":1867},[1568,2493,1839],{"class":1574},[1568,2495,2496,2499,2501],{"class":1570,"line":1686},[1568,2497,2498],{"class":1882},"        timerFunc",[1568,2500,1653],{"class":1578},[1568,2502,1839],{"class":1574},[1568,2504,2505],{"class":1570,"line":1696},[1568,2506,2051],{"class":1574},[1568,2508,2509],{"class":1570,"line":1741},[1568,2510,2057],{"class":1574},[1568,2512,2513],{"class":1570,"line":1753},[1568,2514,1621],{"emptyLinePlaceholder":1620},[1568,2516,2517,2519,2522,2524],{"class":1570,"line":1759},[1568,2518,1879],{"class":1705},[1568,2520,2521],{"class":1882}," flushCallbacks",[1568,2523,1653],{"class":1574},[1568,2525,1644],{"class":1574},[1568,2527,2528,2531,2533,2535],{"class":1570,"line":1764},[1568,2529,2530],{"class":1597},"    pending",[1568,2532,1712],{"class":1574},[1568,2534,1868],{"class":1867},[1568,2536,1839],{"class":1574},[1568,2538,2539,2541,2544,2546,2549,2551,2554,2556,2559,2561],{"class":1570,"line":1770},[1568,2540,1900],{"class":1705},[1568,2542,2543],{"class":1597}," cbs",[1568,2545,1712],{"class":1574},[1568,2547,2548],{"class":1597}," callbacks",[1568,2550,1911],{"class":1574},[1568,2552,2553],{"class":1882},"slice",[1568,2555,1886],{"class":1578},[1568,2557,2558],{"class":1673},"0",[1568,2560,1893],{"class":1578},[1568,2562,1839],{"class":1574},[1568,2564,2565,2567,2569,2571,2573,2575],{"class":1570,"line":2043},[1568,2566,2451],{"class":1597},[1568,2568,1911],{"class":1574},[1568,2570,2218],{"class":1597},[1568,2572,1712],{"class":1574},[1568,2574,1674],{"class":1673},[1568,2576,1839],{"class":1574},[1568,2578,2579,2581,2583,2585,2587,2589,2591,2593,2595,2597,2599,2601,2603,2605,2607,2609,2611],{"class":1570,"line":2048},[1568,2580,2194],{"class":1637},[1568,2582,1702],{"class":1578},[1568,2584,1706],{"class":1705},[1568,2586,1709],{"class":1597},[1568,2588,1712],{"class":1574},[1568,2590,1674],{"class":1673},[1568,2592,1717],{"class":1574},[1568,2594,1709],{"class":1597},[1568,2596,1722],{"class":1574},[1568,2598,2543],{"class":1597},[1568,2600,1911],{"class":1574},[1568,2602,2218],{"class":1597},[1568,2604,1717],{"class":1574},[1568,2606,1709],{"class":1597},[1568,2608,1732],{"class":1574},[1568,2610,1735],{"class":1578},[1568,2612,1738],{"class":1574},[1568,2614,2615,2618,2620,2622,2625],{"class":1570,"line":2054},[1568,2616,2617],{"class":1597},"        cbs",[1568,2619,1938],{"class":1578},[1568,2621,2244],{"class":1597},[1568,2623,2624],{"class":1578},"]()",[1568,2626,1839],{"class":1574},[1568,2628,2630],{"class":1570,"line":2629},20,[1568,2631,2051],{"class":1574},[1568,2633,2635],{"class":1570,"line":2634},21,[1568,2636,2057],{"class":1574},[1531,2638,2639,2640,2643,2644,2646,2647,2650],{},"结构很简单：",[1543,2641,2642],{},"callbacks"," 数组收集所有回调，",[1543,2645,2478],{}," 保证一次事件循环只启动一次定时器，到点后由 ",[1543,2648,2649],{},"flushCallbacks"," 逐个执行。",[1531,2652,2653,2656,2657,2660],{},[1543,2654,2655],{},"timerFunc"," 的选择是一条",[1538,2658,2659],{},"优雅降级链","，Vue 按环境能力依次尝试：",[1558,2662,2664],{"className":1818,"code":2663,"language":1820,"meta":1564,"style":1564},"// 1. 优先使用 Promise（微任务）\nif (typeof Promise !== 'undefined') {\n    const p = Promise.resolve();\n    timerFunc = () => {\n        p.then(flushCallbacks);\n    };\n}\n// 2. 退化为 MutationObserver（微任务）\nelse if (typeof MutationObserver !== 'undefined') {\n    let counter = 1;\n    const observer = new MutationObserver(flushCallbacks);\n    const textNode = document.createTextNode(String(counter));\n    observer.observe(textNode, { characterData: true });\n    timerFunc = () => {\n        counter = (counter + 1) % 2;\n        textNode.data = String(counter);\n    };\n}\n// 3. 退化为 setImmediate（宏任务，仅 IE 和 Node 支持）\nelse if (typeof setImmediate !== 'undefined') {\n    timerFunc = () => {\n        setImmediate(flushCallbacks);\n    };\n}\n// 4. 兜底 setTimeout（宏任务）\nelse {\n    timerFunc = () => {\n        setTimeout(flushCallbacks, 0);\n    };\n}\n",[1543,2665,2666,2671,2702,2722,2736,2754,2759,2763,2768,2796,2811,2834,2866,2899,2911,2937,2960,2964,2968,2973,2998,3010,3024,3029,3034,3040,3047,3060,3078,3083],{"__ignoreMap":1564},[1568,2667,2668],{"class":1570,"line":1571},[1568,2669,2670],{"class":1854},"// 1. 优先使用 Promise（微任务）\n",[1568,2672,2673,2676,2678,2681,2685,2688,2691,2695,2698,2700],{"class":1570,"line":1585},[1568,2674,2675],{"class":1637},"if",[1568,2677,1702],{"class":1597},[1568,2679,2680],{"class":1574},"typeof",[1568,2682,2684],{"class":2683},"sYGMc"," Promise",[1568,2686,2687],{"class":1574}," !==",[1568,2689,2690],{"class":1574}," '",[1568,2692,2694],{"class":2693},"sIEYB","undefined",[1568,2696,2697],{"class":1574},"'",[1568,2699,1735],{"class":1597},[1568,2701,1738],{"class":1574},[1568,2703,2704,2706,2709,2711,2713,2715,2718,2720],{"class":1570,"line":1608},[1568,2705,1900],{"class":1705},[1568,2707,2708],{"class":1597}," p",[1568,2710,1712],{"class":1574},[1568,2712,2684],{"class":2683},[1568,2714,1911],{"class":1574},[1568,2716,2717],{"class":1882},"resolve",[1568,2719,1653],{"class":1578},[1568,2721,1839],{"class":1574},[1568,2723,2724,2727,2729,2732,2734],{"class":1570,"line":1617},[1568,2725,2726],{"class":1882},"    timerFunc",[1568,2728,1712],{"class":1574},[1568,2730,2731],{"class":1574}," ()",[1568,2733,2165],{"class":1705},[1568,2735,1644],{"class":1574},[1568,2737,2738,2741,2743,2746,2748,2750,2752],{"class":1570,"line":1624},[1568,2739,2740],{"class":1597},"        p",[1568,2742,1911],{"class":1574},[1568,2744,2745],{"class":1882},"then",[1568,2747,1886],{"class":1578},[1568,2749,2649],{"class":1597},[1568,2751,1893],{"class":1578},[1568,2753,1839],{"class":1574},[1568,2755,2756],{"class":1570,"line":1634},[1568,2757,2758],{"class":1574},"    };\n",[1568,2760,2761],{"class":1570,"line":1647},[1568,2762,2057],{"class":1574},[1568,2764,2765],{"class":1570,"line":1658},[1568,2766,2767],{"class":1854},"// 2. 退化为 MutationObserver（微任务）\n",[1568,2769,2770,2773,2776,2778,2780,2783,2786,2788,2790,2792,2794],{"class":1570,"line":1680},[1568,2771,2772],{"class":1637},"else",[1568,2774,2775],{"class":1637}," if",[1568,2777,1702],{"class":1597},[1568,2779,2680],{"class":1574},[1568,2781,2782],{"class":1597}," MutationObserver ",[1568,2784,2785],{"class":1574},"!==",[1568,2787,2690],{"class":1574},[1568,2789,2694],{"class":2693},[1568,2791,2697],{"class":1574},[1568,2793,1735],{"class":1597},[1568,2795,1738],{"class":1574},[1568,2797,2798,2801,2804,2806,2809],{"class":1570,"line":1686},[1568,2799,2800],{"class":1705},"    let",[1568,2802,2803],{"class":1597}," counter",[1568,2805,1712],{"class":1574},[1568,2807,2808],{"class":1673}," 1",[1568,2810,1839],{"class":1574},[1568,2812,2813,2815,2818,2820,2823,2826,2828,2830,2832],{"class":1570,"line":1696},[1568,2814,1900],{"class":1705},[1568,2816,2817],{"class":1597}," observer",[1568,2819,1712],{"class":1574},[1568,2821,2822],{"class":1574}," new",[1568,2824,2825],{"class":1882}," MutationObserver",[1568,2827,1886],{"class":1578},[1568,2829,2649],{"class":1597},[1568,2831,1893],{"class":1578},[1568,2833,1839],{"class":1574},[1568,2835,2836,2838,2841,2843,2846,2848,2851,2853,2856,2858,2861,2864],{"class":1570,"line":1741},[1568,2837,1900],{"class":1705},[1568,2839,2840],{"class":1597}," textNode",[1568,2842,1712],{"class":1574},[1568,2844,2845],{"class":1597}," document",[1568,2847,1911],{"class":1574},[1568,2849,2850],{"class":1882},"createTextNode",[1568,2852,1886],{"class":1578},[1568,2854,2855],{"class":1882},"String",[1568,2857,1886],{"class":1578},[1568,2859,2860],{"class":1597},"counter",[1568,2862,2863],{"class":1578},"))",[1568,2865,1839],{"class":1574},[1568,2867,2868,2871,2873,2876,2878,2881,2883,2885,2888,2890,2892,2895,2897],{"class":1570,"line":1753},[1568,2869,2870],{"class":1597},"    observer",[1568,2872,1911],{"class":1574},[1568,2874,2875],{"class":1882},"observe",[1568,2877,1886],{"class":1578},[1568,2879,2880],{"class":1597},"textNode",[1568,2882,2157],{"class":1574},[1568,2884,1664],{"class":1574},[1568,2886,2887],{"class":1578}," characterData",[1568,2889,1670],{"class":1574},[1568,2891,1969],{"class":1867},[1568,2893,2894],{"class":1574}," }",[1568,2896,1893],{"class":1578},[1568,2898,1839],{"class":1574},[1568,2900,2901,2903,2905,2907,2909],{"class":1570,"line":1759},[1568,2902,2726],{"class":1882},[1568,2904,1712],{"class":1574},[1568,2906,2731],{"class":1574},[1568,2908,2165],{"class":1705},[1568,2910,1644],{"class":1574},[1568,2912,2913,2916,2918,2920,2922,2925,2927,2929,2932,2935],{"class":1570,"line":1764},[1568,2914,2915],{"class":1597},"        counter",[1568,2917,1712],{"class":1574},[1568,2919,1702],{"class":1578},[1568,2921,2860],{"class":1597},[1568,2923,2924],{"class":1574}," +",[1568,2926,2808],{"class":1673},[1568,2928,1735],{"class":1578},[1568,2930,2931],{"class":1574},"%",[1568,2933,2934],{"class":1673}," 2",[1568,2936,1839],{"class":1574},[1568,2938,2939,2942,2944,2947,2949,2952,2954,2956,2958],{"class":1570,"line":1770},[1568,2940,2941],{"class":1597},"        textNode",[1568,2943,1911],{"class":1574},[1568,2945,2946],{"class":1597},"data",[1568,2948,1712],{"class":1574},[1568,2950,2951],{"class":1882}," String",[1568,2953,1886],{"class":1578},[1568,2955,2860],{"class":1597},[1568,2957,1893],{"class":1578},[1568,2959,1839],{"class":1574},[1568,2961,2962],{"class":1570,"line":2043},[1568,2963,2758],{"class":1574},[1568,2965,2966],{"class":1570,"line":2048},[1568,2967,2057],{"class":1574},[1568,2969,2970],{"class":1570,"line":2054},[1568,2971,2972],{"class":1854},"// 3. 退化为 setImmediate（宏任务，仅 IE 和 Node 支持）\n",[1568,2974,2975,2977,2979,2981,2983,2986,2988,2990,2992,2994,2996],{"class":1570,"line":2629},[1568,2976,2772],{"class":1637},[1568,2978,2775],{"class":1637},[1568,2980,1702],{"class":1597},[1568,2982,2680],{"class":1574},[1568,2984,2985],{"class":1597}," setImmediate ",[1568,2987,2785],{"class":1574},[1568,2989,2690],{"class":1574},[1568,2991,2694],{"class":2693},[1568,2993,2697],{"class":1574},[1568,2995,1735],{"class":1597},[1568,2997,1738],{"class":1574},[1568,2999,3000,3002,3004,3006,3008],{"class":1570,"line":2634},[1568,3001,2726],{"class":1882},[1568,3003,1712],{"class":1574},[1568,3005,2731],{"class":1574},[1568,3007,2165],{"class":1705},[1568,3009,1644],{"class":1574},[1568,3011,3013,3016,3018,3020,3022],{"class":1570,"line":3012},22,[1568,3014,3015],{"class":1882},"        setImmediate",[1568,3017,1886],{"class":1578},[1568,3019,2649],{"class":1597},[1568,3021,1893],{"class":1578},[1568,3023,1839],{"class":1574},[1568,3025,3027],{"class":1570,"line":3026},23,[1568,3028,2758],{"class":1574},[1568,3030,3032],{"class":1570,"line":3031},24,[1568,3033,2057],{"class":1574},[1568,3035,3037],{"class":1570,"line":3036},25,[1568,3038,3039],{"class":1854},"// 4. 兜底 setTimeout（宏任务）\n",[1568,3041,3043,3045],{"class":1570,"line":3042},26,[1568,3044,2772],{"class":1637},[1568,3046,1644],{"class":1574},[1568,3048,3050,3052,3054,3056,3058],{"class":1570,"line":3049},27,[1568,3051,2726],{"class":1882},[1568,3053,1712],{"class":1574},[1568,3055,2731],{"class":1574},[1568,3057,2165],{"class":1705},[1568,3059,1644],{"class":1574},[1568,3061,3063,3066,3068,3070,3072,3074,3076],{"class":1570,"line":3062},28,[1568,3064,3065],{"class":1882},"        setTimeout",[1568,3067,1886],{"class":1578},[1568,3069,2649],{"class":1597},[1568,3071,2157],{"class":1574},[1568,3073,1674],{"class":1673},[1568,3075,1893],{"class":1578},[1568,3077,1839],{"class":1574},[1568,3079,3081],{"class":1570,"line":3080},29,[1568,3082,2758],{"class":1574},[1568,3084,3086],{"class":1570,"line":3085},30,[1568,3087,2057],{"class":1574},[1531,3089,3090,3093,3094,3096,3097,3100],{},[1538,3091,3092],{},"为什么优先微任务？"," 微任务在当前调用栈结束后、浏览器渲染前执行；宏任务要等下一个事件循环，中间可能多经历一次渲染。用微任务执行刷新，能让 DOM 更新尽早发生，减少中间状态被用户看到的机会。在现代浏览器里，",[1543,3095,2655],{}," 走的就是 ",[1543,3098,3099],{},"Promise.then"," 这一档。",[1548,3102],{},[1526,3104,3106],{"id":3105},"thisnexttick-的典型用法","💡 this.$nextTick 的典型用法",[1531,3108,3109,3112,3113,3115,3116,3118,3119,3122],{},[1543,3110,3111],{},"this.$nextTick(cb)"," 就是把 ",[1543,3114,2442],{}," 放进同一个 ",[1543,3117,2642],{}," 数组，等队列刷新完成后执行。典型场景是：",[1538,3120,3121],{},"修改数据后，需要立刻读取更新后的 DOM","。",[1558,3124,3126],{"className":1560,"code":3125,"filename":1562,"language":1563,"meta":1564,"style":1564},"\u003Ctemplate>\n    \u003Cdiv>\n        \u003Cul ref=\"list\">\n            \u003Cli v-for=\"item in list\" :key=\"item\">{{ item }}\u003C/li>\n        \u003C/ul>\n        \u003Cbutton @click=\"addItem\">添加一项\u003C/button>\n    \u003C/div>\n\u003C/template>\n\n\u003Cscript>\nexport default {\n    data() {\n        return { list: ['苹果', '香蕉'] };\n    },\n    methods: {\n        addItem() {\n            this.list.push('橙子');\n\n            // 同步读：列表高度还没更新，拿到的是旧高度\n            console.log('同步读取：', this.$refs.list.offsetHeight);\n\n            this.$nextTick(() => {\n                // 异步读：DOM 已更新，拿到的是新高度\n                console.log('nextTick 读取：', this.$refs.list.offsetHeight);\n            });\n        },\n    },\n};\n\u003C/script>\n",[1543,3127,3128,3136,3144,3166,3208,3217,3247,3256,3264,3268,3276,3284,3292,3326,3330,3339,3348,3371,3375,3380,3420,3424,3439,3444,3480,3489,3494,3498,3502],{"__ignoreMap":1564},[1568,3129,3130,3132,3134],{"class":1570,"line":1571},[1568,3131,1575],{"class":1574},[1568,3133,1579],{"class":1578},[1568,3135,1582],{"class":1574},[1568,3137,3138,3140,3142],{"class":1570,"line":1585},[1568,3139,1588],{"class":1574},[1568,3141,1591],{"class":1578},[1568,3143,1582],{"class":1574},[1568,3145,3146,3149,3151,3154,3156,3159,3162,3164],{"class":1570,"line":1608},[1568,3147,3148],{"class":1574},"        \u003C",[1568,3150,2065],{"class":1578},[1568,3152,3153],{"class":1705}," ref",[1568,3155,1833],{"class":1574},[1568,3157,3158],{"class":1574},"\"",[1568,3160,3161],{"class":2693},"list",[1568,3163,3158],{"class":1574},[1568,3165,1582],{"class":1574},[1568,3167,3168,3171,3173,3176,3178,3180,3183,3185,3188,3190,3192,3195,3197,3199,3202,3204,3206],{"class":1570,"line":1617},[1568,3169,3170],{"class":1574},"            \u003C",[1568,3172,2068],{"class":1578},[1568,3174,3175],{"class":1705}," v-for",[1568,3177,1833],{"class":1574},[1568,3179,3158],{"class":1574},[1568,3181,3182],{"class":2693},"item in list",[1568,3184,3158],{"class":1574},[1568,3186,3187],{"class":1705}," :key",[1568,3189,1833],{"class":1574},[1568,3191,3158],{"class":1574},[1568,3193,3194],{"class":2693},"item",[1568,3196,3158],{"class":1574},[1568,3198,1594],{"class":1574},[1568,3200,3201],{"class":1597},"{{ item }}",[1568,3203,1601],{"class":1574},[1568,3205,2068],{"class":1578},[1568,3207,1582],{"class":1574},[1568,3209,3210,3213,3215],{"class":1570,"line":1624},[1568,3211,3212],{"class":1574},"        \u003C/",[1568,3214,2065],{"class":1578},[1568,3216,1582],{"class":1574},[1568,3218,3219,3221,3224,3227,3229,3231,3234,3236,3238,3241,3243,3245],{"class":1570,"line":1634},[1568,3220,3148],{"class":1574},[1568,3222,3223],{"class":1578},"button",[1568,3225,3226],{"class":1705}," @click",[1568,3228,1833],{"class":1574},[1568,3230,3158],{"class":1574},[1568,3232,3233],{"class":2693},"addItem",[1568,3235,3158],{"class":1574},[1568,3237,1594],{"class":1574},[1568,3239,3240],{"class":1597},"添加一项",[1568,3242,1601],{"class":1574},[1568,3244,3223],{"class":1578},[1568,3246,1582],{"class":1574},[1568,3248,3249,3252,3254],{"class":1570,"line":1647},[1568,3250,3251],{"class":1574},"    \u003C/",[1568,3253,1591],{"class":1578},[1568,3255,1582],{"class":1574},[1568,3257,3258,3260,3262],{"class":1570,"line":1658},[1568,3259,1601],{"class":1574},[1568,3261,1579],{"class":1578},[1568,3263,1582],{"class":1574},[1568,3265,3266],{"class":1570,"line":1680},[1568,3267,1621],{"emptyLinePlaceholder":1620},[1568,3269,3270,3272,3274],{"class":1570,"line":1686},[1568,3271,1575],{"class":1574},[1568,3273,1629],{"class":1578},[1568,3275,1582],{"class":1574},[1568,3277,3278,3280,3282],{"class":1570,"line":1696},[1568,3279,1638],{"class":1637},[1568,3281,1641],{"class":1637},[1568,3283,1644],{"class":1574},[1568,3285,3286,3288,3290],{"class":1570,"line":1741},[1568,3287,1650],{"class":1578},[1568,3289,1653],{"class":1574},[1568,3291,1644],{"class":1574},[1568,3293,3294,3296,3298,3301,3303,3306,3308,3311,3313,3315,3317,3320,3322,3324],{"class":1570,"line":1753},[1568,3295,1661],{"class":1637},[1568,3297,1664],{"class":1574},[1568,3299,3300],{"class":1578}," list",[1568,3302,1670],{"class":1574},[1568,3304,3305],{"class":1578}," [",[1568,3307,2697],{"class":1574},[1568,3309,3310],{"class":2693},"苹果",[1568,3312,2697],{"class":1574},[1568,3314,2157],{"class":1574},[1568,3316,2690],{"class":1574},[1568,3318,3319],{"class":2693},"香蕉",[1568,3321,2697],{"class":1574},[1568,3323,1943],{"class":1578},[1568,3325,1767],{"class":1574},[1568,3327,3328],{"class":1570,"line":1759},[1568,3329,1683],{"class":1574},[1568,3331,3332,3335,3337],{"class":1570,"line":1764},[1568,3333,3334],{"class":1578},"    methods",[1568,3336,1670],{"class":1574},[1568,3338,1644],{"class":1574},[1568,3340,3341,3344,3346],{"class":1570,"line":1770},[1568,3342,3343],{"class":1578},"        addItem",[1568,3345,1653],{"class":1574},[1568,3347,1644],{"class":1574},[1568,3349,3350,3352,3354,3356,3358,3360,3362,3365,3367,3369],{"class":1570,"line":2043},[1568,3351,1744],{"class":1574},[1568,3353,3161],{"class":1597},[1568,3355,1911],{"class":1574},[1568,3357,1981],{"class":1882},[1568,3359,1886],{"class":1578},[1568,3361,2697],{"class":1574},[1568,3363,3364],{"class":2693},"橙子",[1568,3366,2697],{"class":1574},[1568,3368,1893],{"class":1578},[1568,3370,1839],{"class":1574},[1568,3372,3373],{"class":1570,"line":2048},[1568,3374,1621],{"emptyLinePlaceholder":1620},[1568,3376,3377],{"class":1570,"line":2054},[1568,3378,3379],{"class":1854},"            // 同步读：列表高度还没更新，拿到的是旧高度\n",[1568,3381,3382,3385,3387,3390,3392,3394,3397,3399,3401,3404,3407,3409,3411,3413,3416,3418],{"class":1570,"line":2629},[1568,3383,3384],{"class":1597},"            console",[1568,3386,1911],{"class":1574},[1568,3388,3389],{"class":1882},"log",[1568,3391,1886],{"class":1578},[1568,3393,2697],{"class":1574},[1568,3395,3396],{"class":2693},"同步读取：",[1568,3398,2697],{"class":1574},[1568,3400,2157],{"class":1574},[1568,3402,3403],{"class":1574}," this.",[1568,3405,3406],{"class":1597},"$refs",[1568,3408,1911],{"class":1574},[1568,3410,3161],{"class":1597},[1568,3412,1911],{"class":1574},[1568,3414,3415],{"class":1597},"offsetHeight",[1568,3417,1893],{"class":1578},[1568,3419,1839],{"class":1574},[1568,3421,3422],{"class":1570,"line":2634},[1568,3423,1621],{"emptyLinePlaceholder":1620},[1568,3425,3426,3428,3431,3433,3435,3437],{"class":1570,"line":3012},[1568,3427,1744],{"class":1574},[1568,3429,3430],{"class":1882},"$nextTick",[1568,3432,1886],{"class":1578},[1568,3434,1653],{"class":1574},[1568,3436,2165],{"class":1705},[1568,3438,1644],{"class":1574},[1568,3440,3441],{"class":1570,"line":3026},[1568,3442,3443],{"class":1854},"                // 异步读：DOM 已更新，拿到的是新高度\n",[1568,3445,3446,3449,3451,3453,3455,3457,3460,3462,3464,3466,3468,3470,3472,3474,3476,3478],{"class":1570,"line":3031},[1568,3447,3448],{"class":1597},"                console",[1568,3450,1911],{"class":1574},[1568,3452,3389],{"class":1882},[1568,3454,1886],{"class":1578},[1568,3456,2697],{"class":1574},[1568,3458,3459],{"class":2693},"nextTick 读取：",[1568,3461,2697],{"class":1574},[1568,3463,2157],{"class":1574},[1568,3465,3403],{"class":1574},[1568,3467,3406],{"class":1597},[1568,3469,1911],{"class":1574},[1568,3471,3161],{"class":1597},[1568,3473,1911],{"class":1574},[1568,3475,3415],{"class":1597},[1568,3477,1893],{"class":1578},[1568,3479,1839],{"class":1574},[1568,3481,3482,3485,3487],{"class":1570,"line":3036},[1568,3483,3484],{"class":1574},"            }",[1568,3486,1893],{"class":1578},[1568,3488,1839],{"class":1574},[1568,3490,3491],{"class":1570,"line":3042},[1568,3492,3493],{"class":1574},"        },\n",[1568,3495,3496],{"class":1570,"line":3049},[1568,3497,1683],{"class":1574},[1568,3499,3500],{"class":1570,"line":3062},[1568,3501,1767],{"class":1574},[1568,3503,3504,3506,3508],{"class":1570,"line":3080},[1568,3505,1601],{"class":1574},[1568,3507,1629],{"class":1578},[1568,3509,1582],{"class":1574},[1531,3511,3512,3513,1815],{},"本地运行环境：Node.js v22，安装 ",[1543,3514,3515],{},"vue@2.7.16",[1558,3517,3521],{"className":3518,"code":3519,"language":3520,"meta":1564,"style":1564},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","npm install vue@2.7.16\n","bash",[1543,3522,3523],{"__ignoreMap":1564},[1568,3524,3525,3528,3531],{"class":1570,"line":1571},[1568,3526,3527],{"class":2683},"npm",[1568,3529,3530],{"class":2693}," install",[1568,3532,3533],{"class":2693}," vue@2.7.16\n",[3535,3536,3537],"warning",{},[1531,3538,3539,3541],{},[1543,3540,3430],{}," 不是让代码\"立刻执行\"，而是\"等 DOM 更新完再执行\"。如果你只是想延迟执行代码、不涉及读 DOM，用它没有意义。",[3543,3544,3545],"tip",{},[1531,3546,3547,3548,3551,3552,3555,3556,3551,3559,3562,3563,3122],{},"直接操作 DOM 的场景其实大多有替代方案：控制显隐用 ",[1543,3549,3550],{},"v-if"," / ",[1543,3553,3554],{},"v-show","，样式变化用 ",[1543,3557,3558],{},":class",[1543,3560,3561],{},":style"," 绑定。只有读取尺寸、对接第三方 DOM 库这类非碰 DOM 不可的场景，才需要 ",[1543,3564,3430],{},[1548,3566],{},[1526,3568,3570],{"id":3569},"小节总结","🧾 小节总结",[2065,3572,3573,3576,3587,3598,3608,3611],{},[2068,3574,3575],{},"Vue2 数据变化不立即渲染，而是把 Watcher 放入队列，合并到下一次事件循环统一执行。",[2068,3577,3578,3580,3581,3583,3584,3586],{},[1543,3579,1807],{}," 用 ",[1543,3582,1935],{}," 对象按 id 去重，同一个 Watcher 一轮只入队一次；",[1543,3585,2011],{}," 标志保证只注册一次刷新。",[2068,3588,3589,3591,3592,3594,3595,3597],{},[1543,3590,2036],{}," 按 id 排序执行（父组件先于子组件），逐个 ",[1543,3593,2349],{},"，随后调用 ",[1543,3596,2366],{}," 钩子。",[2068,3599,3600,3580,3602,3604,3605,3607],{},[1543,3601,2100],{},[1543,3603,2642],{}," 数组 + ",[1543,3606,2478],{}," 标志收集回调，定时器按 Promise → MutationObserver → setImmediate → setTimeout 降级。",[2068,3609,3610],{},"优先微任务是因为它在当前调用栈结束后、渲染前执行，能让更新尽早生效。",[2068,3612,3613,3614,3616],{},"修改数据后要操作更新后的 DOM，用 ",[1543,3615,3111],{},"；能不用 DOM 的场景尽量用数据绑定代替。",[1548,3618],{},[1526,3620,3622],{"id":3621},"知识问答","❓ 知识问答",[1531,3624,3625],{},[1538,3626,3627],{},"Q1：nextTick 是微任务还是宏任务？",[1531,3629,3630,3631,3633],{},"A：不固定，取决于运行环境。现代浏览器支持 Promise，",[1543,3632,2100],{}," 走微任务；老环境会按降级链退化为 MutationObserver（微任务）、setImmediate 或 setTimeout（宏任务）。Vue 优先选微任务，让回调在渲染前尽早执行。",[1531,3635,3636],{},[1538,3637,3638],{},"Q2：为什么改 10 次数据，DOM 只更新一次？",[1531,3640,3641,3642,3644,3645,3647,3648,3651],{},"A：10 次修改触发的是同一个渲染 Watcher，",[1543,3643,1807],{}," 里的 ",[1543,3646,1935],{}," 对象按 ",[1543,3649,3650],{},"watcher.id"," 去重，它只入队一次，队列刷新时自然只渲染一次。",[1531,3653,3654],{},[1538,3655,3656],{},"Q3：同步修改数据后立刻读 DOM，为什么拿到的是旧值？",[1531,3658,3659,3660,3662],{},"A：渲染是异步的，数据修改只是把 Watcher 放进了队列，真正的 DOM 更新要等 ",[1543,3661,2036],{}," 在下一次事件循环执行。同步代码里 DOM 还没更新，所以读到旧值。",[1531,3664,3665],{},[1538,3666,3667],{},"Q4：flushSchedulerQueue 为什么要给队列排序？",[1531,3669,3670],{},"A：排序按 Watcher id 从小到大执行，id 越小创建越早。父组件的渲染 Watcher 先于子组件创建，排序保证父先更新、子后更新，避免子组件被父组件更新牵连后再重复刷新一次。",[1531,3672,3673],{},[1538,3674,3675],{},"Q5：需要直接操作 DOM 的场景有哪些替代方案？",[1531,3677,3678,3679,3551,3681,3683,3684,3551,3686,3688,3689,3692,3693,3695],{},"A：多数场景可以用数据绑定替代：显隐用 ",[1543,3680,3550],{},[1543,3682,3554],{},"，样式用 ",[1543,3685,3558],{},[1543,3687,3561],{},"，文本用插值或 ",[1543,3690,3691],{},"v-text","。只有读取元素尺寸、初始化图表或地图这类第三方 DOM 库时，才真正需要在 ",[1543,3694,3430],{}," 里操作 DOM。",[1548,3697],{},[1526,3699,3701],{"id":3700},"小练习","🧪 小练习",[1531,3703,3704,3705,3707,3708,3710],{},"写一个计数器组件：点击按钮后 ",[1543,3706,1747],{}," 连续 +1 三次，分别在同步代码和 ",[1543,3709,3430],{}," 回调里打印 DOM 中的文本内容，观察两次打印的差异，并解释原因。",[1558,3712,3715],{"className":1560,"code":3713,"filename":3714,"language":1563,"meta":1564,"style":1564},"\u003Ctemplate>\n    \u003Cdiv>\n        \u003Cp ref=\"text\">{{ count }}\u003C/p>\n        \u003Cbutton @click=\"addThree\">连加三次\u003C/button>\n    \u003C/div>\n\u003C/template>\n\n\u003Cscript>\nexport default {\n    data() {\n        return { count: 0 };\n    },\n    methods: {\n        addThree() {\n            this.count++;\n            this.count++;\n            this.count++;\n\n            // 请在这里编写代码：同步打印 this.$refs.text.textContent\n\n            // 请在这里编写代码：在 $nextTick 回调里打印 this.$refs.text.textContent\n        },\n    },\n};\n\u003C/script>\n","Counter.vue",[1543,3716,3717,3725,3733,3760,3788,3796,3804,3808,3816,3824,3832,3846,3850,3858,3867,3875,3883,3891,3895,3900,3904,3909,3913,3917,3921],{"__ignoreMap":1564},[1568,3718,3719,3721,3723],{"class":1570,"line":1571},[1568,3720,1575],{"class":1574},[1568,3722,1579],{"class":1578},[1568,3724,1582],{"class":1574},[1568,3726,3727,3729,3731],{"class":1570,"line":1585},[1568,3728,1588],{"class":1574},[1568,3730,1591],{"class":1578},[1568,3732,1582],{"class":1574},[1568,3734,3735,3737,3739,3741,3743,3745,3748,3750,3752,3754,3756,3758],{"class":1570,"line":1608},[1568,3736,3148],{"class":1574},[1568,3738,1531],{"class":1578},[1568,3740,3153],{"class":1705},[1568,3742,1833],{"class":1574},[1568,3744,3158],{"class":1574},[1568,3746,3747],{"class":2693},"text",[1568,3749,3158],{"class":1574},[1568,3751,1594],{"class":1574},[1568,3753,1598],{"class":1597},[1568,3755,1601],{"class":1574},[1568,3757,1531],{"class":1578},[1568,3759,1582],{"class":1574},[1568,3761,3762,3764,3766,3768,3770,3772,3775,3777,3779,3782,3784,3786],{"class":1570,"line":1617},[1568,3763,3148],{"class":1574},[1568,3765,3223],{"class":1578},[1568,3767,3226],{"class":1705},[1568,3769,1833],{"class":1574},[1568,3771,3158],{"class":1574},[1568,3773,3774],{"class":2693},"addThree",[1568,3776,3158],{"class":1574},[1568,3778,1594],{"class":1574},[1568,3780,3781],{"class":1597},"连加三次",[1568,3783,1601],{"class":1574},[1568,3785,3223],{"class":1578},[1568,3787,1582],{"class":1574},[1568,3789,3790,3792,3794],{"class":1570,"line":1624},[1568,3791,3251],{"class":1574},[1568,3793,1591],{"class":1578},[1568,3795,1582],{"class":1574},[1568,3797,3798,3800,3802],{"class":1570,"line":1634},[1568,3799,1601],{"class":1574},[1568,3801,1579],{"class":1578},[1568,3803,1582],{"class":1574},[1568,3805,3806],{"class":1570,"line":1647},[1568,3807,1621],{"emptyLinePlaceholder":1620},[1568,3809,3810,3812,3814],{"class":1570,"line":1658},[1568,3811,1575],{"class":1574},[1568,3813,1629],{"class":1578},[1568,3815,1582],{"class":1574},[1568,3817,3818,3820,3822],{"class":1570,"line":1680},[1568,3819,1638],{"class":1637},[1568,3821,1641],{"class":1637},[1568,3823,1644],{"class":1574},[1568,3825,3826,3828,3830],{"class":1570,"line":1686},[1568,3827,1650],{"class":1578},[1568,3829,1653],{"class":1574},[1568,3831,1644],{"class":1574},[1568,3833,3834,3836,3838,3840,3842,3844],{"class":1570,"line":1696},[1568,3835,1661],{"class":1637},[1568,3837,1664],{"class":1574},[1568,3839,1667],{"class":1578},[1568,3841,1670],{"class":1574},[1568,3843,1674],{"class":1673},[1568,3845,1677],{"class":1574},[1568,3847,3848],{"class":1570,"line":1741},[1568,3849,1683],{"class":1574},[1568,3851,3852,3854,3856],{"class":1570,"line":1753},[1568,3853,3334],{"class":1578},[1568,3855,1670],{"class":1574},[1568,3857,1644],{"class":1574},[1568,3859,3860,3863,3865],{"class":1570,"line":1759},[1568,3861,3862],{"class":1578},"        addThree",[1568,3864,1653],{"class":1574},[1568,3866,1644],{"class":1574},[1568,3868,3869,3871,3873],{"class":1570,"line":1764},[1568,3870,1744],{"class":1574},[1568,3872,1747],{"class":1597},[1568,3874,1750],{"class":1574},[1568,3876,3877,3879,3881],{"class":1570,"line":1770},[1568,3878,1744],{"class":1574},[1568,3880,1747],{"class":1597},[1568,3882,1750],{"class":1574},[1568,3884,3885,3887,3889],{"class":1570,"line":2043},[1568,3886,1744],{"class":1574},[1568,3888,1747],{"class":1597},[1568,3890,1750],{"class":1574},[1568,3892,3893],{"class":1570,"line":2048},[1568,3894,1621],{"emptyLinePlaceholder":1620},[1568,3896,3897],{"class":1570,"line":2054},[1568,3898,3899],{"class":1854},"            // 请在这里编写代码：同步打印 this.$refs.text.textContent\n",[1568,3901,3902],{"class":1570,"line":2629},[1568,3903,1621],{"emptyLinePlaceholder":1620},[1568,3905,3906],{"class":1570,"line":2634},[1568,3907,3908],{"class":1854},"            // 请在这里编写代码：在 $nextTick 回调里打印 this.$refs.text.textContent\n",[1568,3910,3911],{"class":1570,"line":3012},[1568,3912,3493],{"class":1574},[1568,3914,3915],{"class":1570,"line":3026},[1568,3916,1683],{"class":1574},[1568,3918,3919],{"class":1570,"line":3031},[1568,3920,1767],{"class":1574},[1568,3922,3923,3925,3927],{"class":1570,"line":3036},[1568,3924,1601],{"class":1574},[1568,3926,1629],{"class":1578},[1568,3928,1582],{"class":1574},[1548,3930],{},[1531,3932,3933],{},"🎉 恭喜你已经掌握 Vue2 异步更新队列与 nextTick 的原理啦！理解了\"watcher 去重入队、微任务统一刷新\"这套机制，再看 Vue 的各种更新行为就都讲得通了。",[3935,3936,3937],"style",{},"html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s8pZq, html code.shiki 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