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timer",[1621,1730,1665],{"class":1635},[1621,1732,1733],{"class":1631}," setTimeout",[1621,1735,1636],{"class":1714},[1621,1737,1738],{"class":1635},"()",[1621,1740,1741],{"class":1627}," =>",[1621,1743,1652],{"class":1635},[1621,1745,1747,1750,1753,1756,1758,1761,1764,1766],{"class":1623,"line":1746},8,[1621,1748,1749],{"class":1661},"            fn",[1621,1751,1752],{"class":1635},".",[1621,1754,1755],{"class":1631},"apply",[1621,1757,1636],{"class":1714},[1621,1759,1760],{"class":1635},"this,",[1621,1762,1763],{"class":1661}," args",[1621,1765,1649],{"class":1714},[1621,1767,1722],{"class":1635},[1621,1769,1771,1774,1776,1778],{"class":1623,"line":1770},9,[1621,1772,1773],{"class":1635},"        },",[1621,1775,1646],{"class":1661},[1621,1777,1649],{"class":1714},[1621,1779,1722],{"class":1635},[1621,1781,1783],{"class":1623,"line":1782},10,[1621,1784,1785],{"class":1635},"    };\n",[1621,1787,1789],{"class":1623,"line":1788},11,[1621,1790,1791],{"class":1635},"}\n",[1530,1793,1794],{},"用法很直接，把原来的处理函数包一层就行：",[1611,1796,1798],{"className":1613,"code":1797,"language":1616,"meta":1617,"style":1617},"// 搜索联想：停止输入 300ms 后才发请求\nconst onInput = debounce((keyword) => {\n    console.log('发送搜索请求：', keyword);\n}, 300);\n",[1587,1799,1800,1805,1831,1861],{"__ignoreMap":1617},[1621,1801,1802],{"class":1623,"line":1624},[1621,1803,1804],{"class":1671},"// 搜索联想：停止输入 300ms 后才发请求\n",[1621,1806,1807,1810,1813,1816,1818,1820,1822,1825,1827,1829],{"class":1623,"line":1655},[1621,1808,1809],{"class":1627},"const",[1621,1811,1812],{"class":1661}," onInput ",[1621,1814,1815],{"class":1635},"=",[1621,1817,1632],{"class":1631},[1621,1819,1636],{"class":1661},[1621,1821,1636],{"class":1635},[1621,1823,1824],{"class":1639},"keyword",[1621,1826,1649],{"class":1635},[1621,1828,1741],{"class":1627},[1621,1830,1652],{"class":1635},[1621,1832,1833,1836,1838,1841,1843,1846,1850,1852,1854,1857,1859],{"class":1623,"line":1675},[1621,1834,1835],{"class":1661},"    console",[1621,1837,1752],{"class":1635},[1621,1839,1840],{"class":1631},"log",[1621,1842,1636],{"class":1714},[1621,1844,1845],{"class":1635},"'",[1621,1847,1849],{"class":1848},"sIEYB","发送搜索请求：",[1621,1851,1845],{"class":1635},[1621,1853,1643],{"class":1635},[1621,1855,1856],{"class":1661}," keyword",[1621,1858,1649],{"class":1714},[1621,1860,1722],{"class":1635},[1621,1862,1863,1866,1870,1872],{"class":1623,"line":1682},[1621,1864,1865],{"class":1635},"},",[1621,1867,1869],{"class":1868},"smPcV"," 300",[1621,1871,1649],{"class":1661},[1621,1873,1722],{"class":1635},[1530,1875,1876],{},"这样用户连续敲键盘时请求一次都不会发，只有停下手来才真正请求，请求次数从「按字母数算」变成「按停顿次数算」。",[1878,1879,1880],"tip",{},[1530,1881,1882],{},"防抖适合「只关心最后一次结果」的场景：搜索联想、窗口 resize 后重新布局、表单自动保存草稿。",[1577,1884],{},[1525,1886,1888],{"id":1887},"节流固定节奏执行","🧱 节流：固定节奏执行",[1530,1890,1891,1892,1895],{},"再看另一个场景：监听页面滚动，根据滚动位置决定是否显示「回到顶部」按钮。",[1587,1893,1894],{},"scroll"," 事件触发频率很高，拖一下滚动条可能触发几十次，每次都执行处理函数太浪费了。",[1530,1897,1898,1899,1902,1903,1905,1906],{},"这次防抖就不合适了：用户可能一直滚动不停，我们希望滚动过程中也能",[1534,1900,1901],{},"定期","更新状态，而不是等停下来才更新。解决思路是",[1534,1904,1554],{},"（throttle）：",[1534,1907,1908],{},"不管事件触发多频繁，都按固定的时间间隔执行，间隔内的触发直接忽略。",[1530,1910,1911,1912,1915],{},"节流就像",[1534,1913,1914],{},"游戏里的技能冷却","：技能放出去后进入冷却时间，冷却期间你怎么按技能键都没反应，冷却结束才能放下一次。按键频率再高，技能释放的节奏也是固定的。",[1611,1917,1920],{"className":1613,"code":1918,"filename":1919,"language":1616,"meta":1617,"style":1617},"function throttle(fn, interval) {\n    let lastTime = 0; // 上次执行的时间点\n\n    return function (...args) {\n        const now = Date.now();\n        // 距离上次执行还不够一个间隔，直接忽略\n        if (now - lastTime >= interval) {\n            lastTime = now;\n            fn.apply(this, args);\n        }\n    };\n}\n","throttle.js",[1587,1921,1922,1942,1960,1964,1978,2000,2005,2031,2042,2060,2065,2069],{"__ignoreMap":1617},[1621,1923,1924,1926,1929,1931,1933,1935,1938,1940],{"class":1623,"line":1624},[1621,1925,1628],{"class":1627},[1621,1927,1928],{"class":1631}," throttle",[1621,1930,1636],{"class":1635},[1621,1932,1640],{"class":1639},[1621,1934,1643],{"class":1635},[1621,1936,1937],{"class":1639}," interval",[1621,1939,1649],{"class":1635},[1621,1941,1652],{"class":1635},[1621,1943,1944,1946,1949,1951,1954,1957],{"class":1623,"line":1655},[1621,1945,1658],{"class":1627},[1621,1947,1948],{"class":1661}," lastTime",[1621,1950,1665],{"class":1635},[1621,1952,1953],{"class":1868}," 0",[1621,1955,1956],{"class":1635},";",[1621,1958,1959],{"class":1671}," // 上次执行的时间点\n",[1621,1961,1962],{"class":1623,"line":1675},[1621,1963,1679],{"emptyLinePlaceholder":1678},[1621,1965,1966,1968,1970,1972,1974,1976],{"class":1623,"line":1682},[1621,1967,1686],{"class":1685},[1621,1969,1689],{"class":1627},[1621,1971,1692],{"class":1635},[1621,1973,1695],{"class":1639},[1621,1975,1649],{"class":1635},[1621,1977,1652],{"class":1635},[1621,1979,1980,1983,1986,1988,1991,1993,1996,1998],{"class":1623,"line":1702},[1621,1981,1982],{"class":1627},"        const",[1621,1984,1985],{"class":1661}," now",[1621,1987,1665],{"class":1635},[1621,1989,1990],{"class":1661}," Date",[1621,1992,1752],{"class":1635},[1621,1994,1995],{"class":1631},"now",[1621,1997,1738],{"class":1714},[1621,1999,1722],{"class":1635},[1621,2001,2002],{"class":1623,"line":1708},[1621,2003,2004],{"class":1671},"        // 距离上次执行还不够一个间隔，直接忽略\n",[1621,2006,2007,2010,2013,2015,2018,2020,2023,2025,2028],{"class":1623,"line":1725},[1621,2008,2009],{"class":1685},"        if",[1621,2011,2012],{"class":1714}," (",[1621,2014,1995],{"class":1661},[1621,2016,2017],{"class":1635}," -",[1621,2019,1948],{"class":1661},[1621,2021,2022],{"class":1635}," >=",[1621,2024,1937],{"class":1661},[1621,2026,2027],{"class":1714},") ",[1621,2029,2030],{"class":1635},"{\n",[1621,2032,2033,2036,2038,2040],{"class":1623,"line":1746},[1621,2034,2035],{"class":1661},"            lastTime",[1621,2037,1665],{"class":1635},[1621,2039,1985],{"class":1661},[1621,2041,1722],{"class":1635},[1621,2043,2044,2046,2048,2050,2052,2054,2056,2058],{"class":1623,"line":1770},[1621,2045,1749],{"class":1661},[1621,2047,1752],{"class":1635},[1621,2049,1755],{"class":1631},[1621,2051,1636],{"class":1714},[1621,2053,1760],{"class":1635},[1621,2055,1763],{"class":1661},[1621,2057,1649],{"class":1714},[1621,2059,1722],{"class":1635},[1621,2061,2062],{"class":1623,"line":1782},[1621,2063,2064],{"class":1635},"        }\n",[1621,2066,2067],{"class":1623,"line":1788},[1621,2068,1785],{"class":1635},[1621,2070,2072],{"class":1623,"line":2071},12,[1621,2073,1791],{"class":1635},[1530,2075,2076],{},"用法同样是包一层：",[1611,2078,2080],{"className":1613,"code":2079,"language":1616,"meta":1617,"style":1617},"// 滚动监听：每 200ms 才执行一次\nconst onScroll = throttle(() => {\n    console.log('当前滚动位置：', window.scrollY);\n}, 200);\n\nwindow.addEventListener('scroll', onScroll);\n",[1587,2081,2082,2087,2106,2137,2148,2152],{"__ignoreMap":1617},[1621,2083,2084],{"class":1623,"line":1624},[1621,2085,2086],{"class":1671},"// 滚动监听：每 200ms 才执行一次\n",[1621,2088,2089,2091,2094,2096,2098,2100,2102,2104],{"class":1623,"line":1655},[1621,2090,1809],{"class":1627},[1621,2092,2093],{"class":1661}," onScroll ",[1621,2095,1815],{"class":1635},[1621,2097,1928],{"class":1631},[1621,2099,1636],{"class":1661},[1621,2101,1738],{"class":1635},[1621,2103,1741],{"class":1627},[1621,2105,1652],{"class":1635},[1621,2107,2108,2110,2112,2114,2116,2118,2121,2123,2125,2128,2130,2133,2135],{"class":1623,"line":1675},[1621,2109,1835],{"class":1661},[1621,2111,1752],{"class":1635},[1621,2113,1840],{"class":1631},[1621,2115,1636],{"class":1714},[1621,2117,1845],{"class":1635},[1621,2119,2120],{"class":1848},"当前滚动位置：",[1621,2122,1845],{"class":1635},[1621,2124,1643],{"class":1635},[1621,2126,2127],{"class":1661}," window",[1621,2129,1752],{"class":1635},[1621,2131,2132],{"class":1661},"scrollY",[1621,2134,1649],{"class":1714},[1621,2136,1722],{"class":1635},[1621,2138,2139,2141,2144,2146],{"class":1623,"line":1682},[1621,2140,1865],{"class":1635},[1621,2142,2143],{"class":1868}," 200",[1621,2145,1649],{"class":1661},[1621,2147,1722],{"class":1635},[1621,2149,2150],{"class":1623,"line":1702},[1621,2151,1679],{"emptyLinePlaceholder":1678},[1621,2153,2154,2157,2159,2162,2164,2166,2168,2170,2172,2175],{"class":1623,"line":1708},[1621,2155,2156],{"class":1661},"window",[1621,2158,1752],{"class":1635},[1621,2160,2161],{"class":1631},"addEventListener",[1621,2163,1636],{"class":1661},[1621,2165,1845],{"class":1635},[1621,2167,1894],{"class":1848},[1621,2169,1845],{"class":1635},[1621,2171,1643],{"class":1635},[1621,2173,2174],{"class":1661}," onScroll)",[1621,2176,1722],{"class":1635},[1530,2178,2179],{},"事件照样高频触发，但处理函数每 200ms 才执行一次，开销立刻降下来了。",[1577,2181],{},[1525,2183,2185],{"id":2184},"防抖与节流的区别","⚡ 防抖与节流的区别",[1530,2187,2188],{},"这两个概念是初学者很容易混淆的一对，我们用一张表对比清楚：",[2190,2191,2192,2208],"table",{},[2193,2194,2195],"thead",{},[2196,2197,2198,2202,2205],"tr",{},[2199,2200,2201],"th",{},"对比项",[2199,2203,2204],{},"防抖 debounce",[2199,2206,2207],{},"节流 throttle",[2209,2210,2211,2223,2234,2245],"tbody",{},[2196,2212,2213,2217,2220],{},[2214,2215,2216],"td",{},"执行时机",[2214,2218,2219],{},"事件「停下来」之后执行一次",[2214,2221,2222],{},"按固定间隔执行，停不下来也会执行",[2196,2224,2225,2228,2231],{},[2214,2226,2227],{},"生活比喻",[2214,2229,2230],{},"电梯等人，人齐了才关门",[2214,2232,2233],{},"技能冷却，到点才能放",[2196,2235,2236,2239,2242],{},[2214,2237,2238],{},"触发 n 次事件",[2214,2240,2241],{},"通常只执行 1 次（最后一次）",[2214,2243,2244],{},"大约执行 n × 间隔比例次",[2196,2246,2247,2250,2253],{},[2214,2248,2249],{},"典型场景",[2214,2251,2252],{},"搜索联想、resize、自动保存",[2214,2254,2255],{},"滚动监听、鼠标移动、按钮防连点",[1530,2257,2258,2259,2262],{},"一句话记忆：",[1534,2260,2261],{},"防抖是「等你做完」，节流是「按我的节奏来」","。选型的关键问题是：你需要的是「最终那一次」的结果，还是「过程中持续的反馈」？前者用防抖，后者用节流。",[2264,2265,2266],"warning",{},[1530,2267,2268,2269,2272],{},"两个函数都返回一个新函数，事件绑定和解绑时要用同一个新函数。比如在 Vue 组件卸载时 ",[1587,2270,2271],{},"removeEventListener","，传入的必须是当初绑定的那个包装后的函数。",[1577,2274],{},[1525,2276,2278],{"id":2277},"虚拟列表只渲染看得见的部分","🧱 虚拟列表：只渲染看得见的部分",[1530,2280,2281,2282,2285],{},"再来看长列表的卡顿问题。假设一个页面要展示一万条数据，如果用 ",[1587,2283,2284],{},"v-for"," 全部渲染，浏览器就要一口气创建一万个 DOM 节点。DOM 节点是很「重」的对象，创建、布局、绘制都要消耗资源，节点多了之后，首次渲染慢、滚动也卡。",[1530,2287,2288,2289,2292,2293],{},"关键在于：",[1534,2290,2291],{},"用户一次能看到的，只有屏幕里那十几条","。看不到的那九千多条，渲染出来纯属浪费。虚拟列表（Virtual List）的核心思想就是：",[1534,2294,2295],{},"只渲染可视区域附近的条目，滚动时动态替换内容，让页面上的 DOM 节点始终维持在几十个。",[1530,2297,2298,2299,2302],{},"生活化一点说，这就像机场的航班信息屏：机场一天有几百个航班，但屏幕一次只显示十几行，滚动查看时屏幕上的行数不变，只是每一行的内容被替换成了新的航班。虚拟列表里的 DOM 节点就是这些固定行，",[1534,2300,2301],{},"复用位置、替换内容","。",[1530,2304,2305],{},"原理可以拆成三步：",[2307,2308,2309,2315,2325],"ol",{},[1545,2310,2311,2314],{},[1534,2312,2313],{},"撑开总高度","：用一个占位元素把高度设为「条目数 × 每条高度」，让滚动条表现得和真实一万条一样长。",[1545,2316,2317,2320,2321,2324],{},[1534,2318,2319],{},"算出该渲染哪些","：监听滚动，用 ",[1587,2322,2323],{},"scrollTop ÷ 每条高度"," 算出可视区域起始下标，加上一屏能显示的条数，得到要渲染的一小段数据。",[1545,2326,2327,2330,2331,2334],{},[1534,2328,2329],{},"对齐位置","：用一个内层容器做垂直偏移（",[1587,2332,2333],{},"transform: translateY","），让这一小段内容正好出现在可视区域里。",[1530,2336,2337],{},"简化的示意代码如下：",[1611,2339,2342],{"className":1613,"code":2340,"filename":2341,"language":1616,"meta":1617,"style":1617},"const itemHeight = 50; // 每条高度固定 50px\nconst total = 10000; // 共一万条\nconst visibleCount = 10; // 一屏大约显示 10 条\n\nfunction getVisibleItems(scrollTop) {\n    // 1. 算出可视区域从第几条开始\n    const start = Math.floor(scrollTop / itemHeight);\n    // 2. 截取这一小段数据（实际渲染的只有 10 条）\n    // listData 是完整的一万条数据\n    const items = listData.slice(start, start + visibleCount);\n    // 3. 内层容器的偏移量，让内容对齐到正确位置\n    const offsetY = start * itemHeight;\n    return { items, offsetY };\n}\n","virtual-list.js",[1587,2343,2344,2361,2378,2395,2399,2415,2420,2452,2457,2462,2498,2503,2521,2538],{"__ignoreMap":1617},[1621,2345,2346,2348,2351,2353,2356,2358],{"class":1623,"line":1624},[1621,2347,1809],{"class":1627},[1621,2349,2350],{"class":1661}," itemHeight ",[1621,2352,1815],{"class":1635},[1621,2354,2355],{"class":1868}," 50",[1621,2357,1956],{"class":1635},[1621,2359,2360],{"class":1671}," // 每条高度固定 50px\n",[1621,2362,2363,2365,2368,2370,2373,2375],{"class":1623,"line":1655},[1621,2364,1809],{"class":1627},[1621,2366,2367],{"class":1661}," total ",[1621,2369,1815],{"class":1635},[1621,2371,2372],{"class":1868}," 10000",[1621,2374,1956],{"class":1635},[1621,2376,2377],{"class":1671}," // 共一万条\n",[1621,2379,2380,2382,2385,2387,2390,2392],{"class":1623,"line":1675},[1621,2381,1809],{"class":1627},[1621,2383,2384],{"class":1661}," visibleCount ",[1621,2386,1815],{"class":1635},[1621,2388,2389],{"class":1868}," 10",[1621,2391,1956],{"class":1635},[1621,2393,2394],{"class":1671}," // 一屏大约显示 10 条\n",[1621,2396,2397],{"class":1623,"line":1682},[1621,2398,1679],{"emptyLinePlaceholder":1678},[1621,2400,2401,2403,2406,2408,2411,2413],{"class":1623,"line":1702},[1621,2402,1628],{"class":1627},[1621,2404,2405],{"class":1631}," getVisibleItems",[1621,2407,1636],{"class":1635},[1621,2409,2410],{"class":1639},"scrollTop",[1621,2412,1649],{"class":1635},[1621,2414,1652],{"class":1635},[1621,2416,2417],{"class":1623,"line":1708},[1621,2418,2419],{"class":1671},"    // 1. 算出可视区域从第几条开始\n",[1621,2421,2422,2425,2428,2430,2433,2435,2438,2440,2442,2445,2448,2450],{"class":1623,"line":1725},[1621,2423,2424],{"class":1627},"    const",[1621,2426,2427],{"class":1661}," start",[1621,2429,1665],{"class":1635},[1621,2431,2432],{"class":1661}," Math",[1621,2434,1752],{"class":1635},[1621,2436,2437],{"class":1631},"floor",[1621,2439,1636],{"class":1714},[1621,2441,2410],{"class":1661},[1621,2443,2444],{"class":1635}," /",[1621,2446,2447],{"class":1661}," itemHeight",[1621,2449,1649],{"class":1714},[1621,2451,1722],{"class":1635},[1621,2453,2454],{"class":1623,"line":1746},[1621,2455,2456],{"class":1671},"    // 2. 截取这一小段数据（实际渲染的只有 10 条）\n",[1621,2458,2459],{"class":1623,"line":1770},[1621,2460,2461],{"class":1671},"    // listData 是完整的一万条数据\n",[1621,2463,2464,2466,2469,2471,2474,2476,2479,2481,2484,2486,2488,2491,2494,2496],{"class":1623,"line":1782},[1621,2465,2424],{"class":1627},[1621,2467,2468],{"class":1661}," items",[1621,2470,1665],{"class":1635},[1621,2472,2473],{"class":1661}," listData",[1621,2475,1752],{"class":1635},[1621,2477,2478],{"class":1631},"slice",[1621,2480,1636],{"class":1714},[1621,2482,2483],{"class":1661},"start",[1621,2485,1643],{"class":1635},[1621,2487,2427],{"class":1661},[1621,2489,2490],{"class":1635}," +",[1621,2492,2493],{"class":1661}," visibleCount",[1621,2495,1649],{"class":1714},[1621,2497,1722],{"class":1635},[1621,2499,2500],{"class":1623,"line":1788},[1621,2501,2502],{"class":1671},"    // 3. 内层容器的偏移量，让内容对齐到正确位置\n",[1621,2504,2505,2507,2510,2512,2514,2517,2519],{"class":1623,"line":2071},[1621,2506,2424],{"class":1627},[1621,2508,2509],{"class":1661}," offsetY",[1621,2511,1665],{"class":1635},[1621,2513,2427],{"class":1661},[1621,2515,2516],{"class":1635}," *",[1621,2518,2447],{"class":1661},[1621,2520,1722],{"class":1635},[1621,2522,2524,2526,2529,2531,2533,2535],{"class":1623,"line":2523},13,[1621,2525,1686],{"class":1685},[1621,2527,2528],{"class":1635}," {",[1621,2530,2468],{"class":1661},[1621,2532,1643],{"class":1635},[1621,2534,2509],{"class":1661},[1621,2536,2537],{"class":1635}," };\n",[1621,2539,2541],{"class":1623,"line":2540},14,[1621,2542,1791],{"class":1635},[1530,2544,2545,2546,2549,2550,2553],{},"无论 ",[1587,2547,2548],{},"total"," 是一万还是十万，真正渲染的 DOM 都只有 ",[1587,2551,2552],{},"visibleCount"," 那么多，滚动时只需要更新这一小段数据和偏移量，这就是虚拟列表流畅的原因。",[2264,2555,2556],{},[1530,2557,2558],{},"上面的简化版要求每条高度固定。如果条目高度不固定（比如长度不一的评论），计算会复杂不少，这时更建议直接用现成库。",[1530,2560,2561,2562,2565,2566,2569],{},"实战中不必自己造轮子，Vue3 项目可以直接用成熟库，比如 ",[1534,2563,2564],{},"vue-virtual-scroller","（本地验证环境：Node.js v22，包版本 ",[1587,2567,2568],{},"vue-virtual-scroller@2.0.0-beta.8","）：",[1611,2571,2575],{"className":2572,"code":2573,"language":2574,"meta":1617,"style":1617},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add vue-virtual-scroller@2.0.0-beta.8\n","bash",[1587,2576,2577],{"__ignoreMap":1617},[1621,2578,2579,2583,2586],{"class":1623,"line":1624},[1621,2580,2582],{"class":2581},"sYGMc","pnpm",[1621,2584,2585],{"class":1848}," add",[1621,2587,2588],{"class":1848}," vue-virtual-scroller@2.0.0-beta.8\n",[1611,2590,2595],{"className":2591,"code":2592,"filename":2593,"language":2594,"meta":1617,"style":1617},"language-vue shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cscript setup>\nimport { RecycleScroller } from 'vue-virtual-scroller';\nimport 'vue-virtual-scroller/dist/vue-virtual-scroller.css';\n\n// users 是一万条用户数据\ndefineProps(['users']);\n\u003C/script>\n\n\u003Ctemplate>\n    \u003CRecycleScroller :items=\"users\" :item-size=\"50\" style=\"height: 500px\">\n        \u003Ctemplate #default=\"{ item }\">\n            \u003Cdiv class=\"row\">{{ item.name }}\u003C/div>\n        \u003C/template>\n    \u003C/RecycleScroller>\n\u003C/template>\n","UserList.vue","vue",[1587,2596,2597,2611,2636,2649,2653,2658,2678,2687,2691,2700,2746,2776,2808,2817,2826],{"__ignoreMap":1617},[1621,2598,2599,2602,2605,2608],{"class":1623,"line":1624},[1621,2600,2601],{"class":1635},"\u003C",[1621,2603,2604],{"class":1714},"script",[1621,2606,2607],{"class":1627}," setup",[1621,2609,2610],{"class":1635},">\n",[1621,2612,2613,2616,2618,2621,2624,2627,2630,2632,2634],{"class":1623,"line":1655},[1621,2614,2615],{"class":1685},"import",[1621,2617,2528],{"class":1635},[1621,2619,2620],{"class":1661}," RecycleScroller",[1621,2622,2623],{"class":1635}," }",[1621,2625,2626],{"class":1685}," from",[1621,2628,2629],{"class":1635}," '",[1621,2631,2564],{"class":1848},[1621,2633,1845],{"class":1635},[1621,2635,1722],{"class":1635},[1621,2637,2638,2640,2642,2645,2647],{"class":1623,"line":1675},[1621,2639,2615],{"class":1685},[1621,2641,2629],{"class":1635},[1621,2643,2644],{"class":1848},"vue-virtual-scroller/dist/vue-virtual-scroller.css",[1621,2646,1845],{"class":1635},[1621,2648,1722],{"class":1635},[1621,2650,2651],{"class":1623,"line":1682},[1621,2652,1679],{"emptyLinePlaceholder":1678},[1621,2654,2655],{"class":1623,"line":1702},[1621,2656,2657],{"class":1671},"// users 是一万条用户数据\n",[1621,2659,2660,2663,2666,2668,2671,2673,2676],{"class":1623,"line":1708},[1621,2661,2662],{"class":1631},"defineProps",[1621,2664,2665],{"class":1661},"([",[1621,2667,1845],{"class":1635},[1621,2669,2670],{"class":1848},"users",[1621,2672,1845],{"class":1635},[1621,2674,2675],{"class":1661},"])",[1621,2677,1722],{"class":1635},[1621,2679,2680,2683,2685],{"class":1623,"line":1725},[1621,2681,2682],{"class":1635},"\u003C/",[1621,2684,2604],{"class":1714},[1621,2686,2610],{"class":1635},[1621,2688,2689],{"class":1623,"line":1746},[1621,2690,1679],{"emptyLinePlaceholder":1678},[1621,2692,2693,2695,2698],{"class":1623,"line":1770},[1621,2694,2601],{"class":1635},[1621,2696,2697],{"class":1714},"template",[1621,2699,2610],{"class":1635},[1621,2701,2702,2705,2708,2711,2713,2716,2718,2720,2723,2725,2727,2730,2732,2735,2737,2739,2742,2744],{"class":1623,"line":1782},[1621,2703,2704],{"class":1635},"    \u003C",[1621,2706,2707],{"class":1714},"RecycleScroller",[1621,2709,2710],{"class":1627}," :items",[1621,2712,1815],{"class":1635},[1621,2714,2715],{"class":1635},"\"",[1621,2717,2670],{"class":1848},[1621,2719,2715],{"class":1635},[1621,2721,2722],{"class":1627}," :item-size",[1621,2724,1815],{"class":1635},[1621,2726,2715],{"class":1635},[1621,2728,2729],{"class":1848},"50",[1621,2731,2715],{"class":1635},[1621,2733,2734],{"class":1627}," style",[1621,2736,1815],{"class":1635},[1621,2738,2715],{"class":1635},[1621,2740,2741],{"class":1848},"height: 500px",[1621,2743,2715],{"class":1635},[1621,2745,2610],{"class":1635},[1621,2747,2748,2751,2753,2756,2759,2761,2763,2766,2769,2772,2774],{"class":1623,"line":1788},[1621,2749,2750],{"class":1635},"        \u003C",[1621,2752,2697],{"class":1714},[1621,2754,2755],{"class":1635}," #",[1621,2757,2758],{"class":1627},"default",[1621,2760,1815],{"class":1635},[1621,2762,2715],{"class":1635},[1621,2764,2765],{"class":1635},"{",[1621,2767,2768],{"class":1661}," item ",[1621,2770,2771],{"class":1635},"}",[1621,2773,2715],{"class":1635},[1621,2775,2610],{"class":1635},[1621,2777,2778,2781,2784,2787,2789,2791,2794,2796,2799,2802,2804,2806],{"class":1623,"line":2071},[1621,2779,2780],{"class":1635},"            \u003C",[1621,2782,2783],{"class":1714},"div",[1621,2785,2786],{"class":1627}," class",[1621,2788,1815],{"class":1635},[1621,2790,2715],{"class":1635},[1621,2792,2793],{"class":1848},"row",[1621,2795,2715],{"class":1635},[1621,2797,2798],{"class":1635},">",[1621,2800,2801],{"class":1661},"{{ item.name }}",[1621,2803,2682],{"class":1635},[1621,2805,2783],{"class":1714},[1621,2807,2610],{"class":1635},[1621,2809,2810,2813,2815],{"class":1623,"line":2523},[1621,2811,2812],{"class":1635},"        \u003C/",[1621,2814,2697],{"class":1714},[1621,2816,2610],{"class":1635},[1621,2818,2819,2822,2824],{"class":1623,"line":2540},[1621,2820,2821],{"class":1635},"    \u003C/",[1621,2823,2707],{"class":1714},[1621,2825,2610],{"class":1635},[1621,2827,2829,2831,2833],{"class":1623,"line":2828},15,[1621,2830,2682],{"class":1635},[1621,2832,2697],{"class":1714},[1621,2834,2610],{"class":1635},[1530,2836,2837],{},"指定每条高度和容器高度，库就帮你处理好了上面说的所有计算，你只需要关心每条数据怎么展示。",[1577,2839],{},[1525,2841,2843],{"id":2842},"重排与重绘浏览器是怎么画页面的","🧱 重排与重绘：浏览器是怎么画页面的",[1530,2845,2846,2847,2849,2850,2852],{},"最后一个话题回到浏览器本身。要理解为什么有些操作特别卡，先要认识两个概念：",[1534,2848,1568],{},"（reflow）和",[1534,2851,1571],{},"（repaint）。",[1530,2854,2855,2856,2859,2860,2863],{},"浏览器渲染页面可以粗略理解为两步：先算好每个元素的",[1534,2857,2858],{},"几何信息","（多宽多高、在什么位置），再把它们",[1534,2861,2862],{},"画","到屏幕上（颜色、背景、文字）。这两个概念就对应这两步：",[1542,2865,2866,2871],{},[1545,2867,2868,2870],{},[1534,2869,1568],{},"：元素的几何信息变了（宽高、位置、字体大小等），浏览器要重新计算布局，受影响的元素甚至整棵树的布局都可能要重算。就像停车场里把一个车位加宽，后面的车位线全都要跟着重新画。",[1545,2872,2873,2875],{},[1534,2874,1571],{},"：元素的外观变了但几何信息没变（颜色、背景色等），浏览器只需要重新画一遍，不用重算布局。就像给车位里那辆车重新喷个漆，车还是那辆车，车位线一根都不用动。",[1530,2877,2878,2879,2882],{},"很明显，",[1534,2880,2881],{},"重排的代价比重绘大得多","，因为重排包含了布局计算，而且重排之后通常必然跟着重绘。常见的重排触发场景有：修改元素宽高位置、添加删除 DOM 节点、改变窗口大小，以及读取某些布局属性（这一点下面细讲）。",[1577,2884],{},[1525,2886,2888],{"id":2887},"减少重排重绘的三个手段","🛠 减少重排重绘的三个手段",[1530,2890,2891,2892,2895],{},"知道了重排很贵，优化的方向就是",[1534,2893,2894],{},"让它少发生、小范围发生","。下面三个手段日常开发中很实用。",[1530,2897,2898],{},[1534,2899,2900],{},"手段一：批量修改样式，别一条一条改。",[1530,2902,2903,2904,2907],{},"逐条修改样式，每次修改都可能触发一次重排；改用 ",[1587,2905,2906],{},"class"," 一次性切换，浏览器只需要处理一次变化：",[1611,2909,2911],{"className":1613,"code":2910,"language":1616,"meta":1617,"style":1617},"// 不好：三次修改可能触发三次重排\nel.style.width = '100px';\nel.style.height = '100px';\nel.style.backgroundColor = 'skyblue';\n\n// 好：预先写好一个 class，一次切换\nel.classList.add('active');\n",[1587,2912,2913,2918,2944,2967,2991,2995,3000],{"__ignoreMap":1617},[1621,2914,2915],{"class":1623,"line":1624},[1621,2916,2917],{"class":1671},"// 不好：三次修改可能触发三次重排\n",[1621,2919,2920,2923,2925,2928,2930,2933,2935,2937,2940,2942],{"class":1623,"line":1655},[1621,2921,2922],{"class":1661},"el",[1621,2924,1752],{"class":1635},[1621,2926,2927],{"class":1661},"style",[1621,2929,1752],{"class":1635},[1621,2931,2932],{"class":1661},"width ",[1621,2934,1815],{"class":1635},[1621,2936,2629],{"class":1635},[1621,2938,2939],{"class":1848},"100px",[1621,2941,1845],{"class":1635},[1621,2943,1722],{"class":1635},[1621,2945,2946,2948,2950,2952,2954,2957,2959,2961,2963,2965],{"class":1623,"line":1675},[1621,2947,2922],{"class":1661},[1621,2949,1752],{"class":1635},[1621,2951,2927],{"class":1661},[1621,2953,1752],{"class":1635},[1621,2955,2956],{"class":1661},"height ",[1621,2958,1815],{"class":1635},[1621,2960,2629],{"class":1635},[1621,2962,2939],{"class":1848},[1621,2964,1845],{"class":1635},[1621,2966,1722],{"class":1635},[1621,2968,2969,2971,2973,2975,2977,2980,2982,2984,2987,2989],{"class":1623,"line":1682},[1621,2970,2922],{"class":1661},[1621,2972,1752],{"class":1635},[1621,2974,2927],{"class":1661},[1621,2976,1752],{"class":1635},[1621,2978,2979],{"class":1661},"backgroundColor ",[1621,2981,1815],{"class":1635},[1621,2983,2629],{"class":1635},[1621,2985,2986],{"class":1848},"skyblue",[1621,2988,1845],{"class":1635},[1621,2990,1722],{"class":1635},[1621,2992,2993],{"class":1623,"line":1702},[1621,2994,1679],{"emptyLinePlaceholder":1678},[1621,2996,2997],{"class":1623,"line":1708},[1621,2998,2999],{"class":1671},"// 好：预先写好一个 class，一次切换\n",[1621,3001,3002,3004,3006,3009,3011,3014,3016,3018,3021,3023,3025],{"class":1623,"line":1725},[1621,3003,2922],{"class":1661},[1621,3005,1752],{"class":1635},[1621,3007,3008],{"class":1661},"classList",[1621,3010,1752],{"class":1635},[1621,3012,3013],{"class":1631},"add",[1621,3015,1636],{"class":1661},[1621,3017,1845],{"class":1635},[1621,3019,3020],{"class":1848},"active",[1621,3022,1845],{"class":1635},[1621,3024,1649],{"class":1661},[1621,3026,1722],{"class":1635},[1530,3028,3029],{},[1534,3030,3031,3032,3035,3036,3039,3040,3043,3044,2302],{},"手段二：动画用 ",[1587,3033,3034],{},"transform"," 和 ",[1587,3037,3038],{},"opacity","，别用 ",[1587,3041,3042],{},"top"," / ",[1587,3045,3046],{},"left",[1530,3048,3049,3043,3051,3053,3054,3056,3057,3059],{},[1587,3050,3042],{},[1587,3052,3046],{}," 改变的是元素位置，每一帧都会触发重排。而 ",[1587,3055,3034],{},"（位移、缩放、旋转）和 ",[1587,3058,3038],{},"（透明度）可以由浏览器的合成线程直接处理，跳过重排，动画会流畅很多：",[1611,3061,3065],{"className":3062,"code":3063,"language":3064,"meta":1617,"style":1617},"language-css shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","/* 不好：每一帧都在改布局 */\n.box {\n    transition: left 0.3s;\n}\n.box.moved {\n    left: 100px;\n}\n\n/* 好：位移交给 transform，不触发重排 */\n.box {\n    transition: transform 0.3s;\n}\n.box.moved {\n    transform: translateX(100px);\n}\n","css",[1587,3066,3067,3072,3081,3098,3102,3115,3127,3131,3135,3140,3148,3161,3165,3177,3194],{"__ignoreMap":1617},[1621,3068,3069],{"class":1623,"line":1624},[1621,3070,3071],{"class":1671},"/* 不好：每一帧都在改布局 */\n",[1621,3073,3074,3076,3079],{"class":1623,"line":1655},[1621,3075,1752],{"class":1635},[1621,3077,3078],{"class":2581},"box",[1621,3080,1652],{"class":1635},[1621,3082,3083,3087,3090,3093,3096],{"class":1623,"line":1675},[1621,3084,3086],{"class":3085},"sug0G","    transition",[1621,3088,3089],{"class":1635},":",[1621,3091,3092],{"class":1661}," left ",[1621,3094,3095],{"class":1868},"0.3s",[1621,3097,1722],{"class":1635},[1621,3099,3100],{"class":1623,"line":1682},[1621,3101,1791],{"class":1635},[1621,3103,3104,3106,3108,3110,3113],{"class":1623,"line":1702},[1621,3105,1752],{"class":1635},[1621,3107,3078],{"class":2581},[1621,3109,1752],{"class":1635},[1621,3111,3112],{"class":2581},"moved",[1621,3114,1652],{"class":1635},[1621,3116,3117,3120,3122,3125],{"class":1623,"line":1708},[1621,3118,3119],{"class":3085},"    left",[1621,3121,3089],{"class":1635},[1621,3123,3124],{"class":1868}," 100px",[1621,3126,1722],{"class":1635},[1621,3128,3129],{"class":1623,"line":1725},[1621,3130,1791],{"class":1635},[1621,3132,3133],{"class":1623,"line":1746},[1621,3134,1679],{"emptyLinePlaceholder":1678},[1621,3136,3137],{"class":1623,"line":1770},[1621,3138,3139],{"class":1671},"/* 好：位移交给 transform，不触发重排 */\n",[1621,3141,3142,3144,3146],{"class":1623,"line":1782},[1621,3143,1752],{"class":1635},[1621,3145,3078],{"class":2581},[1621,3147,1652],{"class":1635},[1621,3149,3150,3152,3154,3157,3159],{"class":1623,"line":1788},[1621,3151,3086],{"class":3085},[1621,3153,3089],{"class":1635},[1621,3155,3156],{"class":1661}," transform ",[1621,3158,3095],{"class":1868},[1621,3160,1722],{"class":1635},[1621,3162,3163],{"class":1623,"line":2071},[1621,3164,1791],{"class":1635},[1621,3166,3167,3169,3171,3173,3175],{"class":1623,"line":2523},[1621,3168,1752],{"class":1635},[1621,3170,3078],{"class":2581},[1621,3172,1752],{"class":1635},[1621,3174,3112],{"class":2581},[1621,3176,1652],{"class":1635},[1621,3178,3179,3182,3184,3187,3189,3191],{"class":1623,"line":2540},[1621,3180,3181],{"class":3085},"    transform",[1621,3183,3089],{"class":1635},[1621,3185,3186],{"class":1631}," translateX",[1621,3188,1636],{"class":1635},[1621,3190,2939],{"class":1868},[1621,3192,3193],{"class":1635},");\n",[1621,3195,3196],{"class":1623,"line":2828},[1621,3197,1791],{"class":1635},[1530,3199,3200],{},[1534,3201,3202],{},"手段三：读写分离，别边读边写。",[1530,3204,3205,3206,3209,3210,3213,3214,3213,3217,3220],{},"这是容易踩的隐藏坑。浏览器不会每改一行样式就立刻重排一次，而是会把短时间内连续的样式修改先记下来，攒成一批后统一做一次重排，这样十次修改也只花一次重排的成本。但如果你在修改之间",[1534,3207,3208],{},"读取","了布局信息（如 ",[1587,3211,3212],{},"offsetTop","、",[1587,3215,3216],{},"clientWidth",[1587,3218,3219],{},"getBoundingClientRect()","），浏览器为了给你返回准确的值，必须立刻把攒着的修改结算掉、执行一次重排，这个「攒一批再统一处理」的优化就被打断了：",[1611,3222,3224],{"className":1613,"code":3223,"language":1616,"meta":1617,"style":1617},"// 不好：写一下、读一下，每次循环都强制重排\nfor (const el of items) {\n    el.style.width = el.offsetTop + 10 + 'px';\n}\n\n// 好：先集中读完，再集中写\nconst widths = items.map((el) => el.offsetTop + 10);\nitems.forEach((el, i) => {\n    el.style.width = widths[i] + 'px';\n});\n",[1587,3225,3226,3231,3251,3289,3293,3297,3302,3344,3371,3407],{"__ignoreMap":1617},[1621,3227,3228],{"class":1623,"line":1624},[1621,3229,3230],{"class":1671},"// 不好：写一下、读一下，每次循环都强制重排\n",[1621,3232,3233,3236,3238,3240,3243,3246,3249],{"class":1623,"line":1655},[1621,3234,3235],{"class":1685},"for",[1621,3237,2012],{"class":1661},[1621,3239,1809],{"class":1627},[1621,3241,3242],{"class":1661}," el ",[1621,3244,3245],{"class":1635},"of",[1621,3247,3248],{"class":1661}," items) ",[1621,3250,2030],{"class":1635},[1621,3252,3253,3256,3258,3260,3262,3265,3267,3270,3272,3274,3276,3278,3280,3282,3285,3287],{"class":1623,"line":1675},[1621,3254,3255],{"class":1661},"    el",[1621,3257,1752],{"class":1635},[1621,3259,2927],{"class":1661},[1621,3261,1752],{"class":1635},[1621,3263,3264],{"class":1661},"width",[1621,3266,1665],{"class":1635},[1621,3268,3269],{"class":1661}," el",[1621,3271,1752],{"class":1635},[1621,3273,3212],{"class":1661},[1621,3275,2490],{"class":1635},[1621,3277,2389],{"class":1868},[1621,3279,2490],{"class":1635},[1621,3281,2629],{"class":1635},[1621,3283,3284],{"class":1848},"px",[1621,3286,1845],{"class":1635},[1621,3288,1722],{"class":1635},[1621,3290,3291],{"class":1623,"line":1682},[1621,3292,1791],{"class":1635},[1621,3294,3295],{"class":1623,"line":1702},[1621,3296,1679],{"emptyLinePlaceholder":1678},[1621,3298,3299],{"class":1623,"line":1708},[1621,3300,3301],{"class":1671},"// 好：先集中读完，再集中写\n",[1621,3303,3304,3306,3309,3311,3313,3315,3318,3320,3322,3324,3326,3328,3330,3332,3335,3338,3340,3342],{"class":1623,"line":1725},[1621,3305,1809],{"class":1627},[1621,3307,3308],{"class":1661}," widths ",[1621,3310,1815],{"class":1635},[1621,3312,2468],{"class":1661},[1621,3314,1752],{"class":1635},[1621,3316,3317],{"class":1631},"map",[1621,3319,1636],{"class":1661},[1621,3321,1636],{"class":1635},[1621,3323,2922],{"class":1639},[1621,3325,1649],{"class":1635},[1621,3327,1741],{"class":1627},[1621,3329,3269],{"class":1661},[1621,3331,1752],{"class":1635},[1621,3333,3334],{"class":1661},"offsetTop ",[1621,3336,3337],{"class":1635},"+",[1621,3339,2389],{"class":1868},[1621,3341,1649],{"class":1661},[1621,3343,1722],{"class":1635},[1621,3345,3346,3349,3351,3354,3356,3358,3360,3362,3365,3367,3369],{"class":1623,"line":1746},[1621,3347,3348],{"class":1661},"items",[1621,3350,1752],{"class":1635},[1621,3352,3353],{"class":1631},"forEach",[1621,3355,1636],{"class":1661},[1621,3357,1636],{"class":1635},[1621,3359,2922],{"class":1639},[1621,3361,1643],{"class":1635},[1621,3363,3364],{"class":1639}," i",[1621,3366,1649],{"class":1635},[1621,3368,1741],{"class":1627},[1621,3370,1652],{"class":1635},[1621,3372,3373,3375,3377,3379,3381,3383,3385,3388,3391,3394,3397,3399,3401,3403,3405],{"class":1623,"line":1770},[1621,3374,3255],{"class":1661},[1621,3376,1752],{"class":1635},[1621,3378,2927],{"class":1661},[1621,3380,1752],{"class":1635},[1621,3382,3264],{"class":1661},[1621,3384,1665],{"class":1635},[1621,3386,3387],{"class":1661}," widths",[1621,3389,3390],{"class":1714},"[",[1621,3392,3393],{"class":1661},"i",[1621,3395,3396],{"class":1714},"] ",[1621,3398,3337],{"class":1635},[1621,3400,2629],{"class":1635},[1621,3402,3284],{"class":1848},[1621,3404,1845],{"class":1635},[1621,3406,1722],{"class":1635},[1621,3408,3409,3411,3413],{"class":1623,"line":1782},[1621,3410,2771],{"class":1635},[1621,3412,1649],{"class":1661},[1621,3414,1722],{"class":1635},[1530,3416,3417,3418,3421],{},"记住口诀：",[1534,3419,3420],{},"先读后写，读写分开","。循环里夹杂读写是性能杀手，把读取集中在前、写入集中在后，重排就从「每次循环一次」变成「读一批、写一批」。",[1577,3423],{},[1525,3425,3427],{"id":3426},"小节总结","🧾 小节总结",[1542,3429,3430,3435,3440,3443,3448,3456],{},[1545,3431,3432,3434],{},[1534,3433,1550],{},"：事件停下后才执行一次，像电梯等人，适合搜索联想、resize、自动保存。",[1545,3436,3437,3439],{},[1534,3438,1554],{},"：按固定间隔执行，像技能冷却，适合滚动、鼠标移动等高频事件。",[1545,3441,3442],{},"两者选型看需求：要「最终那一次」用防抖，要「过程中持续反馈」用节流。",[1545,3444,3445,3447],{},[1534,3446,1561],{},"只渲染可视区域的条目，让一万条数据的列表也只维持几十个 DOM 节点，实战可直接用 vue-virtual-scroller。",[1545,3449,3450,3452,3453,3455],{},[1534,3451,1568],{},"重算布局、代价大，",[1534,3454,1571],{},"只重画外观、代价小，重排之后必然跟着重绘。",[1545,3457,3458,3459,3043,3461,3463],{},"优化三板斧：批量修改样式、动画用 ",[1587,3460,3034],{},[1587,3462,3038],{},"、读写分离（先集中读、再集中写）。",[1577,3465],{},[1525,3467,3469],{"id":3468},"知识问答","❓ 知识问答",[1530,3471,3472],{},[1534,3473,3474],{},"Q1：防抖和节流可以自己写，项目里还要引入 lodash 吗？",[1530,3476,3477,3478,3043,3481,3484],{},"A：本文的手写版本覆盖了常用场景，够用了。lodash 的 ",[1587,3479,3480],{},"debounce",[1587,3482,3483],{},"throttle"," 额外支持「立即执行」「最大等待时间」等选项，如果项目已经用了 lodash，直接用它的更省事。",[1530,3486,3487],{},[1534,3488,3489],{},"Q2：按钮防重复点击，用防抖还是节流？",[1530,3491,3492],{},"A：用节流（或直接把冷却时间设长一点）。防连点的目的是「一段时间内只响应一次点击」，这正是固定节奏执行，和节流一致。防抖要等用户停止点击才执行，反而不符合预期。",[1530,3494,3495],{},[1534,3496,3497],{},"Q3：虚拟列表只能用在固定高度的列表吗？",[1530,3499,3500],{},"A：固定高度实现起来简单，高度不固定也能做，但需要额外记录和估算每条的高度，实现复杂度明显上升。这种场景建议直接用 vue-virtual-scroller 这类库，它们已经处理好了动态高度的情况。",[1530,3502,3503],{},[1534,3504,3505],{},"Q4：怎么确认页面有没有频繁重排？",[1530,3507,3508],{},"A：可以用 Chrome DevTools 的 Performance 面板录制一段操作，观察其中紫色的 Layout（重排）和绿色的 Paint（重绘）耗时是否密集出现。",[2264,3510,3511],{},[1530,3512,3513],{},"Chrome DevTools 的界面会随版本更新，面板名称和入口位置可能与你看到的略有不同。以上流程仅供参考，核心思路不变，操作时以你本地的面板为准。",[1530,3515,3516],{},[1534,3517,3518],{},"Q5：重排和重绘，是不是完全不触发更好？",[1530,3520,3521,3522,3525],{},"A：不是，也做不到。页面内容变化本来就需要重新布局和绘制，这是正常开销。优化的目标是",[1534,3523,3524],{},"避免不必要的、重复的、大范围的重排","，而不是追求一次都不发生。",[1577,3527],{},[1525,3529,3531],{"id":3530},"小练习","🧪 小练习",[1530,3533,3534,3535,3537],{},"练习一：给下面的搜索框加上防抖，要求停止输入 300ms 后才打印搜索词。把文中手写的 ",[1587,3536,3480],{}," 复制过来直接用即可。",[1611,3539,3542],{"className":2591,"code":3540,"filename":3541,"language":2594,"meta":1617,"style":1617},"\u003Cscript setup>\n// 请在这里粘贴 debounce 的实现\n\nfunction search(keyword) {\n    console.log('搜索：', keyword);\n}\n\n// 请在这里编写代码：用 debounce 包装 search，延迟 300ms\n\u003C/script>\n\n\u003Ctemplate>\n    \u003C!-- 请在这里编写代码：绑定 input 事件，调用包装后的函数 -->\n    \u003Cinput placeholder=\"输入关键词\" />\n\u003C/template>\n","SearchBox.vue",[1587,3543,3544,3554,3559,3563,3578,3603,3607,3611,3616,3624,3628,3636,3641,3662],{"__ignoreMap":1617},[1621,3545,3546,3548,3550,3552],{"class":1623,"line":1624},[1621,3547,2601],{"class":1635},[1621,3549,2604],{"class":1714},[1621,3551,2607],{"class":1627},[1621,3553,2610],{"class":1635},[1621,3555,3556],{"class":1623,"line":1655},[1621,3557,3558],{"class":1671},"// 请在这里粘贴 debounce 的实现\n",[1621,3560,3561],{"class":1623,"line":1675},[1621,3562,1679],{"emptyLinePlaceholder":1678},[1621,3564,3565,3567,3570,3572,3574,3576],{"class":1623,"line":1682},[1621,3566,1628],{"class":1627},[1621,3568,3569],{"class":1631}," search",[1621,3571,1636],{"class":1635},[1621,3573,1824],{"class":1639},[1621,3575,1649],{"class":1635},[1621,3577,1652],{"class":1635},[1621,3579,3580,3582,3584,3586,3588,3590,3593,3595,3597,3599,3601],{"class":1623,"line":1702},[1621,3581,1835],{"class":1661},[1621,3583,1752],{"class":1635},[1621,3585,1840],{"class":1631},[1621,3587,1636],{"class":1714},[1621,3589,1845],{"class":1635},[1621,3591,3592],{"class":1848},"搜索：",[1621,3594,1845],{"class":1635},[1621,3596,1643],{"class":1635},[1621,3598,1856],{"class":1661},[1621,3600,1649],{"class":1714},[1621,3602,1722],{"class":1635},[1621,3604,3605],{"class":1623,"line":1708},[1621,3606,1791],{"class":1635},[1621,3608,3609],{"class":1623,"line":1725},[1621,3610,1679],{"emptyLinePlaceholder":1678},[1621,3612,3613],{"class":1623,"line":1746},[1621,3614,3615],{"class":1671},"// 请在这里编写代码：用 debounce 包装 search，延迟 300ms\n",[1621,3617,3618,3620,3622],{"class":1623,"line":1770},[1621,3619,2682],{"class":1635},[1621,3621,2604],{"class":1714},[1621,3623,2610],{"class":1635},[1621,3625,3626],{"class":1623,"line":1782},[1621,3627,1679],{"emptyLinePlaceholder":1678},[1621,3629,3630,3632,3634],{"class":1623,"line":1788},[1621,3631,2601],{"class":1635},[1621,3633,2697],{"class":1714},[1621,3635,2610],{"class":1635},[1621,3637,3638],{"class":1623,"line":2071},[1621,3639,3640],{"class":1671},"    \u003C!-- 请在这里编写代码：绑定 input 事件，调用包装后的函数 -->\n",[1621,3642,3643,3645,3647,3650,3652,3654,3657,3659],{"class":1623,"line":2523},[1621,3644,2704],{"class":1635},[1621,3646,1589],{"class":1714},[1621,3648,3649],{"class":1627}," placeholder",[1621,3651,1815],{"class":1635},[1621,3653,2715],{"class":1635},[1621,3655,3656],{"class":1848},"输入关键词",[1621,3658,2715],{"class":1635},[1621,3660,3661],{"class":1635}," />\n",[1621,3663,3664,3666,3668],{"class":1623,"line":2540},[1621,3665,2682],{"class":1635},[1621,3667,2697],{"class":1714},[1621,3669,2610],{"class":1635},[1530,3671,3672],{},"练习二：下面这段代码在一个 500 项的循环里边读边写，请改成「读写分离」的写法。",[1611,3674,3676],{"className":1613,"code":3675,"language":1616,"meta":1617,"style":1617},"const items = document.querySelectorAll('.item');\n\n// 请在这里编写代码：先集中读取 offsetTop，再集中写入 height\nfor (const el of items) {\n    el.style.height = el.offsetTop + 20 + 'px';\n}\n",[1587,3677,3678,3708,3712,3717,3733,3769],{"__ignoreMap":1617},[1621,3679,3680,3682,3685,3687,3690,3692,3695,3697,3699,3702,3704,3706],{"class":1623,"line":1624},[1621,3681,1809],{"class":1627},[1621,3683,3684],{"class":1661}," items ",[1621,3686,1815],{"class":1635},[1621,3688,3689],{"class":1661}," document",[1621,3691,1752],{"class":1635},[1621,3693,3694],{"class":1631},"querySelectorAll",[1621,3696,1636],{"class":1661},[1621,3698,1845],{"class":1635},[1621,3700,3701],{"class":1848},".item",[1621,3703,1845],{"class":1635},[1621,3705,1649],{"class":1661},[1621,3707,1722],{"class":1635},[1621,3709,3710],{"class":1623,"line":1655},[1621,3711,1679],{"emptyLinePlaceholder":1678},[1621,3713,3714],{"class":1623,"line":1675},[1621,3715,3716],{"class":1671},"// 请在这里编写代码：先集中读取 offsetTop，再集中写入 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