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loading",[1605,1700,1629],{"class":1618},[1605,1702,1632],{"class":1618},[1605,1704,1705],{"class":1635},"lazy",[1605,1707,1632],{"class":1618},[1605,1709,1653],{"class":1618},[1605,1711,1713,1715,1717,1719,1721,1723,1726,1728,1730,1732,1734,1737,1739,1741,1743,1745,1747,1749],{"class":1607,"line":1712},6,[1605,1714,1619],{"class":1618},[1605,1716,1592],{"class":1622},[1605,1718,1626],{"class":1625},[1605,1720,1629],{"class":1618},[1605,1722,1632],{"class":1618},[1605,1724,1725],{"class":1635},"photo-2.png",[1605,1727,1632],{"class":1618},[1605,1729,1641],{"class":1625},[1605,1731,1629],{"class":1618},[1605,1733,1632],{"class":1618},[1605,1735,1736],{"class":1635},"配图2",[1605,1738,1632],{"class":1618},[1605,1740,1698],{"class":1625},[1605,1742,1629],{"class":1618},[1605,1744,1632],{"class":1618},[1605,1746,1705],{"class":1635},[1605,1748,1632],{"class":1618},[1605,1750,1653],{"class":1618},[1530,1752,1753,1754,1757],{},"浏览器会自动判断图片和可视区域的距离，快滚动到它时才发起下载。这个方案兼容性好、零成本，是图片懒加载的",[1534,1755,1756],{},"优先推荐做法","。",[1759,1760,1761],"tip",{},[1530,1762,1763,1764,1766],{},"首屏立刻可见的图片（比如顶部横幅）不要加 ",[1549,1765,1551],{},"，否则浏览器反而可能推迟它的加载，拖慢首屏。",[1575,1768],{},[1525,1770,1772],{"id":1771},"图片懒加载intersectionobserver-思路","🧱 图片懒加载：IntersectionObserver 思路",[1530,1774,1775],{},"原生属性虽好，但了解背后的手动实现思路仍然值得：面试常问，而且「等元素进入可视区域再做事」这个思路还能用在无限滚动、曝光统计等场景。",[1530,1777,1778,1779,1782],{},"核心工具是浏览器提供的 ",[1534,1780,1781],{},"IntersectionObserver","（交叉观察器）。你可以把它想象成一个「哨兵」：你让它盯着某个元素，一旦这个元素进入（或离开）可视区域，它就通知你。我们利用这个通知，把图片的真实地址换上：",[1595,1784,1786],{"className":1597,"code":1785,"filename":1599,"language":1600,"meta":1601,"style":1601},"\u003C!-- 注意：src 先放空或占位图，真实地址存在 data-src 里 -->\n\u003Cimg class=\"lazy-img\" data-src=\"photo-1.png\" alt=\"配图1\" />\n",[1549,1787,1788,1793],{"__ignoreMap":1601},[1605,1789,1790],{"class":1607,"line":1608},[1605,1791,1792],{"class":1611},"\u003C!-- 注意：src 先放空或占位图，真实地址存在 data-src 里 -->\n",[1605,1794,1795,1797,1799,1802,1804,1806,1809,1811,1814,1816,1818,1820,1822,1824,1826,1828,1830,1832],{"class":1607,"line":1615},[1605,1796,1619],{"class":1618},[1605,1798,1592],{"class":1622},[1605,1800,1801],{"class":1625}," class",[1605,1803,1629],{"class":1618},[1605,1805,1632],{"class":1618},[1605,1807,1808],{"class":1635},"lazy-img",[1605,1810,1632],{"class":1618},[1605,1812,1813],{"class":1625}," data-src",[1605,1815,1629],{"class":1618},[1605,1817,1632],{"class":1618},[1605,1819,1682],{"class":1635},[1605,1821,1632],{"class":1618},[1605,1823,1641],{"class":1625},[1605,1825,1629],{"class":1618},[1605,1827,1632],{"class":1618},[1605,1829,1693],{"class":1635},[1605,1831,1632],{"class":1618},[1605,1833,1653],{"class":1618},[1595,1835,1840],{"className":1836,"code":1837,"filename":1838,"language":1839,"meta":1601,"style":1601},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","// 创建一个哨兵，盯着所有 .lazy-img 元素\nconst observer = new IntersectionObserver((entries) => {\n    entries.forEach((entry) => {\n        // isIntersecting 为 true，表示元素进入可视区域了\n        if (entry.isIntersecting) {\n            const img = entry.target;\n            img.src = img.dataset.src; // 把真实地址换上，浏览器开始下载\n            observer.unobserve(img); // 加载完就不用再盯它了\n        }\n    });\n});\n\ndocument.querySelectorAll('.lazy-img').forEach((img) => {\n    observer.observe(img); // 让哨兵开始盯每一张图\n});\n","lazy.js","js",[1549,1841,1842,1847,1883,1907,1912,1934,1956,1986,2008,2014,2024,2034,2039,2077,2099],{"__ignoreMap":1601},[1605,1843,1844],{"class":1607,"line":1608},[1605,1845,1846],{"class":1611},"// 创建一个哨兵，盯着所有 .lazy-img 元素\n",[1605,1848,1849,1852,1856,1858,1861,1865,1868,1870,1874,1877,1880],{"class":1607,"line":1615},[1605,1850,1851],{"class":1625},"const",[1605,1853,1855],{"class":1854},"sndM8"," observer ",[1605,1857,1629],{"class":1618},[1605,1859,1860],{"class":1618}," new",[1605,1862,1864],{"class":1863},"swgpB"," IntersectionObserver",[1605,1866,1867],{"class":1854},"(",[1605,1869,1867],{"class":1618},[1605,1871,1873],{"class":1872},"sK9QF","entries",[1605,1875,1876],{"class":1618},")",[1605,1878,1879],{"class":1625}," =>",[1605,1881,1882],{"class":1618}," {\n",[1605,1884,1885,1888,1891,1894,1896,1898,1901,1903,1905],{"class":1607,"line":1656},[1605,1886,1887],{"class":1854},"    entries",[1605,1889,1890],{"class":1618},".",[1605,1892,1893],{"class":1863},"forEach",[1605,1895,1867],{"class":1622},[1605,1897,1867],{"class":1618},[1605,1899,1900],{"class":1872},"entry",[1605,1902,1876],{"class":1618},[1605,1904,1879],{"class":1625},[1605,1906,1882],{"class":1618},[1605,1908,1909],{"class":1607,"line":1663},[1605,1910,1911],{"class":1611},"        // isIntersecting 为 true，表示元素进入可视区域了\n",[1605,1913,1914,1918,1921,1923,1925,1928,1931],{"class":1607,"line":1669},[1605,1915,1917],{"class":1916},"s8pZq","        if",[1605,1919,1920],{"class":1622}," (",[1605,1922,1900],{"class":1854},[1605,1924,1890],{"class":1618},[1605,1926,1927],{"class":1854},"isIntersecting",[1605,1929,1930],{"class":1622},") ",[1605,1932,1933],{"class":1618},"{\n",[1605,1935,1936,1939,1942,1945,1948,1950,1953],{"class":1607,"line":1712},[1605,1937,1938],{"class":1625},"            const",[1605,1940,1941],{"class":1854}," img",[1605,1943,1944],{"class":1618}," =",[1605,1946,1947],{"class":1854}," entry",[1605,1949,1890],{"class":1618},[1605,1951,1952],{"class":1854},"target",[1605,1954,1955],{"class":1618},";\n",[1605,1957,1959,1962,1964,1967,1969,1971,1973,1976,1978,1980,1983],{"class":1607,"line":1958},7,[1605,1960,1961],{"class":1854},"            img",[1605,1963,1890],{"class":1618},[1605,1965,1966],{"class":1854},"src",[1605,1968,1944],{"class":1618},[1605,1970,1941],{"class":1854},[1605,1972,1890],{"class":1618},[1605,1974,1975],{"class":1854},"dataset",[1605,1977,1890],{"class":1618},[1605,1979,1966],{"class":1854},[1605,1981,1982],{"class":1618},";",[1605,1984,1985],{"class":1611}," // 把真实地址换上，浏览器开始下载\n",[1605,1987,1989,1992,1994,1997,1999,2001,2003,2005],{"class":1607,"line":1988},8,[1605,1990,1991],{"class":1854},"            observer",[1605,1993,1890],{"class":1618},[1605,1995,1996],{"class":1863},"unobserve",[1605,1998,1867],{"class":1622},[1605,2000,1592],{"class":1854},[1605,2002,1876],{"class":1622},[1605,2004,1982],{"class":1618},[1605,2006,2007],{"class":1611}," // 加载完就不用再盯它了\n",[1605,2009,2011],{"class":1607,"line":2010},9,[1605,2012,2013],{"class":1618},"        }\n",[1605,2015,2017,2020,2022],{"class":1607,"line":2016},10,[1605,2018,2019],{"class":1618},"    }",[1605,2021,1876],{"class":1622},[1605,2023,1955],{"class":1618},[1605,2025,2027,2030,2032],{"class":1607,"line":2026},11,[1605,2028,2029],{"class":1618},"}",[1605,2031,1876],{"class":1854},[1605,2033,1955],{"class":1618},[1605,2035,2037],{"class":1607,"line":2036},12,[1605,2038,1660],{"emptyLinePlaceholder":1659},[1605,2040,2042,2044,2046,2049,2051,2054,2057,2059,2061,2063,2065,2067,2069,2071,2073,2075],{"class":1607,"line":2041},13,[1605,2043,7],{"class":1854},[1605,2045,1890],{"class":1618},[1605,2047,2048],{"class":1863},"querySelectorAll",[1605,2050,1867],{"class":1854},[1605,2052,2053],{"class":1618},"'",[1605,2055,2056],{"class":1635},".lazy-img",[1605,2058,2053],{"class":1618},[1605,2060,1876],{"class":1854},[1605,2062,1890],{"class":1618},[1605,2064,1893],{"class":1863},[1605,2066,1867],{"class":1854},[1605,2068,1867],{"class":1618},[1605,2070,1592],{"class":1872},[1605,2072,1876],{"class":1618},[1605,2074,1879],{"class":1625},[1605,2076,1882],{"class":1618},[1605,2078,2080,2083,2085,2088,2090,2092,2094,2096],{"class":1607,"line":2079},14,[1605,2081,2082],{"class":1854},"    observer",[1605,2084,1890],{"class":1618},[1605,2086,2087],{"class":1863},"observe",[1605,2089,1867],{"class":1622},[1605,2091,1592],{"class":1854},[1605,2093,1876],{"class":1622},[1605,2095,1982],{"class":1618},[1605,2097,2098],{"class":1611}," // 让哨兵开始盯每一张图\n",[1605,2100,2102,2104,2106],{"class":1607,"line":2101},15,[1605,2103,2029],{"class":1618},[1605,2105,1876],{"class":1854},[1605,2107,1955],{"class":1618},[1530,2109,2110,2111,2121,2122,2124],{},"整个流程就三步：",[1534,2112,2113,2114,2117,2118,2120],{},"真实地址先存在 ",[1549,2115,2116],{},"data-src"," 里 → 哨兵发现图片进入可视区域 → 把地址换到 ",[1549,2119,1966],{}," 上触发下载","。日常开发中用原生 ",[1549,2123,1551],{}," 就够了，手动实现了解思路即可。",[1575,2126],{},[1525,2128,2130],{"id":2129},"路由懒加载","🧱 路由懒加载",[1530,2132,2133],{},"懒加载的思路不只适用于图片，也适用于整个页面。一个 Vue 单页应用可能有十几个路由页面，如果打包时把它们全部塞进一个 JS 文件，用户打开首页时就要下载全部代码，首屏自然慢。",[1530,2135,2136,2138,2139,2141],{},[1534,2137,2129],{},"的做法是：路由配置里不直接引入组件，而是写一个返回 ",[1549,2140,1558],{}," 的函数：",[1595,2143,2146],{"className":1836,"code":2144,"filename":2145,"language":1839,"meta":1601,"style":1601},"import { createRouter, createWebHistory } from 'vue-router';\nimport Home from './views/Home.vue';\n\nconst router = createRouter({\n    history: createWebHistory(),\n    routes: [\n        // 首页直接引入，首屏就要用\n        { path: '/', component: Home },\n        // 其他页面用动态 import，访问到时才加载\n        { path: '/about', component: () => import('./views/About.vue') },\n        { path: '/user', component: () => import('./views/User.vue') },\n    ],\n});\n","router.js",[1549,2147,2148,2181,2200,2204,2219,2235,2245,2250,2279,2284,2326,2366,2373],{"__ignoreMap":1601},[1605,2149,2150,2153,2156,2159,2162,2165,2168,2171,2174,2177,2179],{"class":1607,"line":1608},[1605,2151,2152],{"class":1916},"import",[1605,2154,2155],{"class":1618}," {",[1605,2157,2158],{"class":1854}," createRouter",[1605,2160,2161],{"class":1618},",",[1605,2163,2164],{"class":1854}," createWebHistory",[1605,2166,2167],{"class":1618}," }",[1605,2169,2170],{"class":1916}," from",[1605,2172,2173],{"class":1618}," '",[1605,2175,2176],{"class":1635},"vue-router",[1605,2178,2053],{"class":1618},[1605,2180,1955],{"class":1618},[1605,2182,2183,2185,2188,2191,2193,2196,2198],{"class":1607,"line":1615},[1605,2184,2152],{"class":1916},[1605,2186,2187],{"class":1854}," Home ",[1605,2189,2190],{"class":1916},"from",[1605,2192,2173],{"class":1618},[1605,2194,2195],{"class":1635},"./views/Home.vue",[1605,2197,2053],{"class":1618},[1605,2199,1955],{"class":1618},[1605,2201,2202],{"class":1607,"line":1656},[1605,2203,1660],{"emptyLinePlaceholder":1659},[1605,2205,2206,2208,2211,2213,2215,2217],{"class":1607,"line":1663},[1605,2207,1851],{"class":1625},[1605,2209,2210],{"class":1854}," router ",[1605,2212,1629],{"class":1618},[1605,2214,2158],{"class":1863},[1605,2216,1867],{"class":1854},[1605,2218,1933],{"class":1618},[1605,2220,2221,2224,2227,2229,2232],{"class":1607,"line":1669},[1605,2222,2223],{"class":1622},"    history",[1605,2225,2226],{"class":1618},":",[1605,2228,2164],{"class":1863},[1605,2230,2231],{"class":1854},"()",[1605,2233,2234],{"class":1618},",\n",[1605,2236,2237,2240,2242],{"class":1607,"line":1712},[1605,2238,2239],{"class":1622},"    routes",[1605,2241,2226],{"class":1618},[1605,2243,2244],{"class":1854}," [\n",[1605,2246,2247],{"class":1607,"line":1958},[1605,2248,2249],{"class":1611},"        // 首页直接引入，首屏就要用\n",[1605,2251,2252,2255,2258,2260,2262,2265,2267,2269,2272,2274,2276],{"class":1607,"line":1988},[1605,2253,2254],{"class":1618},"        {",[1605,2256,2257],{"class":1622}," path",[1605,2259,2226],{"class":1618},[1605,2261,2173],{"class":1618},[1605,2263,2264],{"class":1635},"/",[1605,2266,2053],{"class":1618},[1605,2268,2161],{"class":1618},[1605,2270,2271],{"class":1622}," component",[1605,2273,2226],{"class":1618},[1605,2275,2187],{"class":1854},[1605,2277,2278],{"class":1618},"},\n",[1605,2280,2281],{"class":1607,"line":2010},[1605,2282,2283],{"class":1611},"        // 其他页面用动态 import，访问到时才加载\n",[1605,2285,2286,2288,2290,2292,2294,2297,2299,2301,2303,2305,2308,2310,2313,2315,2317,2320,2322,2324],{"class":1607,"line":2016},[1605,2287,2254],{"class":1618},[1605,2289,2257],{"class":1622},[1605,2291,2226],{"class":1618},[1605,2293,2173],{"class":1618},[1605,2295,2296],{"class":1635},"/about",[1605,2298,2053],{"class":1618},[1605,2300,2161],{"class":1618},[1605,2302,2271],{"class":1863},[1605,2304,2226],{"class":1618},[1605,2306,2307],{"class":1618}," ()",[1605,2309,1879],{"class":1625},[1605,2311,2312],{"class":1618}," import",[1605,2314,1867],{"class":1854},[1605,2316,2053],{"class":1618},[1605,2318,2319],{"class":1635},"./views/About.vue",[1605,2321,2053],{"class":1618},[1605,2323,1930],{"class":1854},[1605,2325,2278],{"class":1618},[1605,2327,2328,2330,2332,2334,2336,2339,2341,2343,2345,2347,2349,2351,2353,2355,2357,2360,2362,2364],{"class":1607,"line":2026},[1605,2329,2254],{"class":1618},[1605,2331,2257],{"class":1622},[1605,2333,2226],{"class":1618},[1605,2335,2173],{"class":1618},[1605,2337,2338],{"class":1635},"/user",[1605,2340,2053],{"class":1618},[1605,2342,2161],{"class":1618},[1605,2344,2271],{"class":1863},[1605,2346,2226],{"class":1618},[1605,2348,2307],{"class":1618},[1605,2350,1879],{"class":1625},[1605,2352,2312],{"class":1618},[1605,2354,1867],{"class":1854},[1605,2356,2053],{"class":1618},[1605,2358,2359],{"class":1635},"./views/User.vue",[1605,2361,2053],{"class":1618},[1605,2363,1930],{"class":1854},[1605,2365,2278],{"class":1618},[1605,2367,2368,2371],{"class":1607,"line":2036},[1605,2369,2370],{"class":1854},"    ]",[1605,2372,2234],{"class":1618},[1605,2374,2375,2377,2379],{"class":1607,"line":2041},[1605,2376,2029],{"class":1618},[1605,2378,1876],{"class":1854},[1605,2380,1955],{"class":1618},[1530,2382,2383,2384,2387,2388,2390,2391,2394,2395,1757],{},"关键就在 ",[1549,2385,2386],{},"() => import('./views/About.vue')"," 这个写法上。",[1549,2389,1558],{}," 是动态导入语法，打包工具（Webpack、Vite 都支持）见到它时，会把 ",[1549,2392,2393],{},"About.vue"," 单独拆成一个文件，而不是合并进主包。运行时的效果就是：",[1534,2396,2397,2398,2400],{},"用户访问 ",[1549,2399,2296],{}," 路由的那一刻，浏览器才去下载 About 页面的代码",[1530,2402,2403],{},"这样首页只需下载「公共代码 + 首页代码」，体积小了，首屏自然就快了。至于首屏必经的首页，保持直接引入即可。",[1759,2405,2406],{},[1530,2407,2408,2409,2413],{},"vue-router 的安装与基础配置在 Node.js v22 + vue-router 4.x 下验证，完整用法见 ",[2410,2411,2412],"a",{"href":671},"Vue3 使用课程","，这里只关注懒加载写法。",[1575,2415],{},[1525,2417,2419],{"id":2418},"预加载-preload-与预取-prefetch","⚡ 预加载 preload 与预取 prefetch",[1530,2421,2422,2423,2426,2427,2430,2431,2434],{},"懒加载是「推迟不急着要的」，反过来还有一对「提前准备马上要的」的手段：",[1534,2424,2425],{},"preload（预加载）"," 和 ",[1534,2428,2429],{},"prefetch（预取）","。两者都写在 ",[1549,2432,2433],{},"\u003Clink rel>"," 里，长得像、名字像，是初学者非常容易混淆的点，我们对比着讲清楚。",[1530,2436,2437],{},[1534,2438,2439],{},"preload：当前页面马上就要用的资源，高优先级提前下载。",[1530,2441,2442],{},"比如页面用一个自定义字体渲染大标题，浏览器要等到 CSS 解析完才发现这个字体，标题会先显示成默认字体再「跳变」。用 preload 可以让浏览器尽早开始下载：",[1595,2444,2446],{"className":1597,"code":2445,"filename":1599,"language":1600,"meta":1601,"style":1601},"\u003Chead>\n    \u003C!-- 当前页面渲染马上要用，提前高优先级下载 -->\n    \u003Clink rel=\"preload\" href=\"/fonts/title.woff2\" as=\"font\" type=\"font/woff2\" crossorigin />\n\u003C/head>\n",[1549,2447,2448,2458,2463,2523],{"__ignoreMap":1601},[1605,2449,2450,2452,2455],{"class":1607,"line":1608},[1605,2451,1619],{"class":1618},[1605,2453,2454],{"class":1622},"head",[1605,2456,2457],{"class":1618},">\n",[1605,2459,2460],{"class":1607,"line":1615},[1605,2461,2462],{"class":1611},"    \u003C!-- 当前页面渲染马上要用，提前高优先级下载 -->\n",[1605,2464,2465,2468,2471,2474,2476,2478,2480,2482,2485,2487,2489,2492,2494,2497,2499,2501,2504,2506,2509,2511,2513,2516,2518,2521],{"class":1607,"line":1656},[1605,2466,2467],{"class":1618},"    \u003C",[1605,2469,2470],{"class":1622},"link",[1605,2472,2473],{"class":1625}," rel",[1605,2475,1629],{"class":1618},[1605,2477,1632],{"class":1618},[1605,2479,1565],{"class":1635},[1605,2481,1632],{"class":1618},[1605,2483,2484],{"class":1625}," href",[1605,2486,1629],{"class":1618},[1605,2488,1632],{"class":1618},[1605,2490,2491],{"class":1635},"/fonts/title.woff2",[1605,2493,1632],{"class":1618},[1605,2495,2496],{"class":1625}," as",[1605,2498,1629],{"class":1618},[1605,2500,1632],{"class":1618},[1605,2502,2503],{"class":1635},"font",[1605,2505,1632],{"class":1618},[1605,2507,2508],{"class":1625}," type",[1605,2510,1629],{"class":1618},[1605,2512,1632],{"class":1618},[1605,2514,2515],{"class":1635},"font/woff2",[1605,2517,1632],{"class":1618},[1605,2519,2520],{"class":1625}," crossorigin",[1605,2522,1653],{"class":1618},[1605,2524,2525,2528,2530],{"class":1607,"line":1663},[1605,2526,2527],{"class":1618},"\u003C/",[1605,2529,2454],{"class":1622},[1605,2531,2457],{"class":1618},[1530,2533,2534,2535,2538,2539,2541,2542,2541,2545,2541,2548,2551],{},"注意 ",[1549,2536,2537],{},"as"," 属性必须写，它告诉浏览器资源类型（",[1549,2540,2503],{},"、",[1549,2543,2544],{},"script",[1549,2546,2547],{},"style",[1549,2549,2550],{},"image"," 等），浏览器据此安排优先级并复用下载结果。",[1530,2553,2554],{},[1534,2555,2556],{},"prefetch：下一个页面可能要用的资源，低优先级空闲时下载。",[1530,2558,2559,2560,2563],{},"比如用户在产品列表页，大概率下一步会点进详情页。我们可以让浏览器在",[1534,2561,2562],{},"当前页面加载完、网络空闲时","，悄悄把详情页的代码先下载好，用户点击时秒开：",[1595,2565,2567],{"className":1597,"code":2566,"filename":1599,"language":1600,"meta":1601,"style":1601},"\u003Chead>\n    \u003C!-- 下一个页面可能要用，利用空闲时间低优先级下载 -->\n    \u003Clink rel=\"prefetch\" href=\"/js/detail-page.js\" />\n\u003C/head>\n",[1549,2568,2569,2577,2582,2611],{"__ignoreMap":1601},[1605,2570,2571,2573,2575],{"class":1607,"line":1608},[1605,2572,1619],{"class":1618},[1605,2574,2454],{"class":1622},[1605,2576,2457],{"class":1618},[1605,2578,2579],{"class":1607,"line":1615},[1605,2580,2581],{"class":1611},"    \u003C!-- 下一个页面可能要用，利用空闲时间低优先级下载 -->\n",[1605,2583,2584,2586,2588,2590,2592,2594,2596,2598,2600,2602,2604,2607,2609],{"class":1607,"line":1656},[1605,2585,2467],{"class":1618},[1605,2587,2470],{"class":1622},[1605,2589,2473],{"class":1625},[1605,2591,1629],{"class":1618},[1605,2593,1632],{"class":1618},[1605,2595,1569],{"class":1635},[1605,2597,1632],{"class":1618},[1605,2599,2484],{"class":1625},[1605,2601,1629],{"class":1618},[1605,2603,1632],{"class":1618},[1605,2605,2606],{"class":1635},"/js/detail-page.js",[1605,2608,1632],{"class":1618},[1605,2610,1653],{"class":1618},[1605,2612,2613,2615,2617],{"class":1607,"line":1663},[1605,2614,2527],{"class":1618},[1605,2616,2454],{"class":1622},[1605,2618,2457],{"class":1618},[1530,2620,2621],{},"一句话记住区别：",[2623,2624,2625,2639],"table",{},[2626,2627,2628],"thead",{},[2629,2630,2631,2635,2637],"tr",{},[2632,2633,2634],"th",{},"对比项",[2632,2636,1565],{},[2632,2638,1569],{},[2640,2641,2642,2659,2670],"tbody",{},[2629,2643,2644,2648,2654],{},[2645,2646,2647],"td",{},"服务对象",[2645,2649,2650,2653],{},[1534,2651,2652],{},"当前页面","的资源",[2645,2655,2656,2653],{},[1534,2657,2658],{},"下一个页面",[2629,2660,2661,2664,2667],{},[2645,2662,2663],{},"优先级",[2645,2665,2666],{},"高，马上开始下载",[2645,2668,2669],{},"低，当前页面加载完空闲才下载",[2629,2671,2672,2675,2678],{},[2645,2673,2674],{},"典型场景",[2645,2676,2677],{},"首屏字体、关键 CSS/JS",[2645,2679,2680],{},"下一步可能访问的页面代码",[2682,2683,2684],"warning",{},[1530,2685,2686],{},"preload 是「声明这个资源很重要」，用错了反而有害：把不关键的资源标成高优先级，会挤占真正关键资源的带宽，只给确定马上要用的资源加。",[1530,2688,2689],{},"你也可以在 Chrome DevTools 的 Network 面板里观察两类资源的加载时机和优先级。",[2682,2691,2692],{},[1530,2693,2694],{},"Chrome DevTools 的界面会不定期更新，面板名称和入口位置可能与你看到的略有不同。以上观察思路不变，操作时以实际界面为准。",[1575,2696],{},[1525,2698,2700],{"id":2699},"代码分包","🧱 代码分包",[1530,2702,2703,2704,1757],{},"最后把视角拉高一点，看看这些手段背后的共同思想：",[1534,2705,2699],{},[1530,2707,2708,2709,2712],{},"打包工具的默认行为是把所有代码合并成少量文件。项目小没问题，项目一大，主包就会膨胀，首屏要下载和解析的东西越来越多。分包就是把这坨代码",[1534,2710,2711],{},"按使用时机拆开","：首屏需要的留在主包里，首屏用不到的拆出去，用到时再下载。",[1530,2714,2715,2716,2718,2719,2541,2722,2724],{},"其实我们这篇已经见过两种分包了：路由懒加载是「按路由拆」，",[1549,2717,1558],{}," 出现的地方就是拆分的边界；prefetch 预取的也常是拆出去的异步包。除此之外还有常见的「按依赖拆」，比如把 ",[1549,2720,2721],{},"vue",[1549,2723,2176],{}," 这类很少变动的第三方库拆成单独的文件，业务代码更新时它们还能继续命中缓存。",[1759,2726,2727],{},[1530,2728,2729,2730,2733,2734,2737,2738,2426,2741,2744],{},"具体的分包配置（如 Vite 的 ",[1549,2731,2732],{},"manualChunks","、Webpack 的 ",[1549,2735,2736],{},"splitChunks","）属于构建工具的范畴，详见 ",[2410,2739,2740],{"href":737},"Vite 课程",[2410,2742,2743],{"href":369},"Webpack 课程","，这里不重复展开，理解「按需拆分」的思想即可。",[1530,2746,2747,2748,2751],{},"判断要不要拆，标准很朴素：",[1534,2749,2750],{},"这个模块首屏需要吗？"," 不需要（比如管理后台的图表页、弹窗里的复杂编辑器），就拆出去按需加载。",[1575,2753],{},[1525,2755,2757],{"id":2756},"小节总结","🧾 小节总结",[1542,2759,2760,2766,2774,2781,2784],{},[1545,2761,2762,2763,2765],{},"图片懒加载优先用原生 ",[1549,2764,1551],{},"，一行属性搞定；首屏立即可见的图不要加。",[1545,2767,2768,2769,2771,2772,1757],{},"IntersectionObserver 像「哨兵」，元素进入可视区域时通知你，手动懒加载就是此时把 ",[1549,2770,2116],{}," 换到 ",[1549,2773,1966],{},[1545,2775,2776,2777,2780],{},"路由懒加载用 ",[1549,2778,2779],{},"() => import('./About.vue')","，打包时拆成单独文件，访问路由时才下载。",[1545,2782,2783],{},"preload 管当前页面：高优先级、马上下载，给首屏关键资源用；prefetch 管下一个页面：低优先级、空闲时下载。",[1545,2785,2786],{},"代码分包的核心思想：首屏用不到的代码拆出去按需加载，具体配置交给构建工具。",[1575,2788],{},[1525,2790,2792],{"id":2791},"知识问答","❓ 知识问答",[1530,2794,2795],{},[1534,2796,2797,2798,2800],{},"Q1：",[1549,2799,1551],{}," 所有浏览器都支持吗？",[1530,2802,2803],{},"A：主流现代浏览器（Chrome、Firefox、Safari、Edge 的较新版本）都已支持。对于不支持的旧浏览器，这个属性会被忽略，图片退化为立即加载，功能不会出错，只是没有懒加载效果。",[1530,2805,2806],{},[1534,2807,2808],{},"Q2：路由懒加载后，组件里的代码都会在访问时才下载吗？",[1530,2810,2811],{},"A：是的，该组件自身以及它独有依赖的模块都会打进那个单独的文件里。但如果某个模块同时被主包和懒加载路由引用，打包工具通常会把它提到公共部分，避免重复下载。",[1530,2813,2814],{},[1534,2815,2816],{},"Q3：preload 和 prefetch 可以同时用吗？",[1530,2818,2819],{},"A：可以，两者服务的资源不同：当前页面关键资源用 preload，下一页资源用 prefetch，互不冲突。但要注意总量，预加载太多资源会占用带宽，反而拖慢真正重要的加载。",[1530,2821,2822],{},[1534,2823,2824,2825,2827],{},"Q4：为什么 preload 必须写 ",[1549,2826,2537],{}," 属性？",[1530,2829,2830,2831,2833,2834,2836],{},"A：",[1549,2832,2537],{}," 告诉浏览器资源类型，浏览器才能设置正确的下载优先级，并在后续真正使用这个资源时复用已下载的内容。漏写 ",[1549,2835,2537],{}," 会导致资源可能被下载两次，preload 就白做了。",[1530,2838,2839],{},[1534,2840,2841],{},"Q5：路由懒加载和 prefetch 是什么关系？",[1530,2843,2844],{},"A：两者是配合关系。懒加载决定「拆出去、用到时才下载」，prefetch 决定「空闲时提前下载好」。不少框架（如 Nuxt）会自动为路由分包生成 prefetch 提示，让懒加载的页面也能秒开。",[1575,2846],{},[1525,2848,2850],{"id":2849},"小练习","🧪 小练习",[1530,2852,2853,2856,2857,2860],{},[1534,2854,2855],{},"练习一","：给一个路由配置补上懒加载。下面的 ",[1549,2858,2859],{},"User.vue"," 目前是直接引入的，把它改成访问时才加载的写法：",[1595,2862,2864],{"className":1836,"code":2863,"language":1839,"meta":1601,"style":1601},"import { createRouter, createWebHistory } from 'vue-router';\nimport Home from './views/Home.vue';\nimport User from './views/User.vue';\n\nconst router = createRouter({\n    history: createWebHistory(),\n    routes: [\n        { path: '/', component: Home },\n        // 请在这里编写代码：把 User 路由改成懒加载写法\n        { path: '/user', component: User },\n    ],\n});\n",[1549,2865,2866,2890,2906,2923,2927,2941,2953,2961,2985,2990,3014,3020],{"__ignoreMap":1601},[1605,2867,2868,2870,2872,2874,2876,2878,2880,2882,2884,2886,2888],{"class":1607,"line":1608},[1605,2869,2152],{"class":1916},[1605,2871,2155],{"class":1618},[1605,2873,2158],{"class":1854},[1605,2875,2161],{"class":1618},[1605,2877,2164],{"class":1854},[1605,2879,2167],{"class":1618},[1605,2881,2170],{"class":1916},[1605,2883,2173],{"class":1618},[1605,2885,2176],{"class":1635},[1605,2887,2053],{"class":1618},[1605,2889,1955],{"class":1618},[1605,2891,2892,2894,2896,2898,2900,2902,2904],{"class":1607,"line":1615},[1605,2893,2152],{"class":1916},[1605,2895,2187],{"class":1854},[1605,2897,2190],{"class":1916},[1605,2899,2173],{"class":1618},[1605,2901,2195],{"class":1635},[1605,2903,2053],{"class":1618},[1605,2905,1955],{"class":1618},[1605,2907,2908,2910,2913,2915,2917,2919,2921],{"class":1607,"line":1656},[1605,2909,2152],{"class":1916},[1605,2911,2912],{"class":1854}," User ",[1605,2914,2190],{"class":1916},[1605,2916,2173],{"class":1618},[1605,2918,2359],{"class":1635},[1605,2920,2053],{"class":1618},[1605,2922,1955],{"class":1618},[1605,2924,2925],{"class":1607,"line":1663},[1605,2926,1660],{"emptyLinePlaceholder":1659},[1605,2928,2929,2931,2933,2935,2937,2939],{"class":1607,"line":1669},[1605,2930,1851],{"class":1625},[1605,2932,2210],{"class":1854},[1605,2934,1629],{"class":1618},[1605,2936,2158],{"class":1863},[1605,2938,1867],{"class":1854},[1605,2940,1933],{"class":1618},[1605,2942,2943,2945,2947,2949,2951],{"class":1607,"line":1712},[1605,2944,2223],{"class":1622},[1605,2946,2226],{"class":1618},[1605,2948,2164],{"class":1863},[1605,2950,2231],{"class":1854},[1605,2952,2234],{"class":1618},[1605,2954,2955,2957,2959],{"class":1607,"line":1958},[1605,2956,2239],{"class":1622},[1605,2958,2226],{"class":1618},[1605,2960,2244],{"class":1854},[1605,2962,2963,2965,2967,2969,2971,2973,2975,2977,2979,2981,2983],{"class":1607,"line":1988},[1605,2964,2254],{"class":1618},[1605,2966,2257],{"class":1622},[1605,2968,2226],{"class":1618},[1605,2970,2173],{"class":1618},[1605,2972,2264],{"class":1635},[1605,2974,2053],{"class":1618},[1605,2976,2161],{"class":1618},[1605,2978,2271],{"class":1622},[1605,2980,2226],{"class":1618},[1605,2982,2187],{"class":1854},[1605,2984,2278],{"class":1618},[1605,2986,2987],{"class":1607,"line":2010},[1605,2988,2989],{"class":1611},"        // 请在这里编写代码：把 User 路由改成懒加载写法\n",[1605,2991,2992,2994,2996,2998,3000,3002,3004,3006,3008,3010,3012],{"class":1607,"line":2016},[1605,2993,2254],{"class":1618},[1605,2995,2257],{"class":1622},[1605,2997,2226],{"class":1618},[1605,2999,2173],{"class":1618},[1605,3001,2338],{"class":1635},[1605,3003,2053],{"class":1618},[1605,3005,2161],{"class":1618},[1605,3007,2271],{"class":1622},[1605,3009,2226],{"class":1618},[1605,3011,2912],{"class":1854},[1605,3013,2278],{"class":1618},[1605,3015,3016,3018],{"class":1607,"line":2026},[1605,3017,2370],{"class":1854},[1605,3019,2234],{"class":1618},[1605,3021,3022,3024,3026],{"class":1607,"line":2036},[1605,3023,2029],{"class":1618},[1605,3025,1876],{"class":1854},[1605,3027,1955],{"class":1618},[1530,3029,3030,3033,3034,3036,3037,3040,3041,3044,3045,3048,3049,3052],{},[1534,3031,3032],{},"练习二","：下面这个页面，大标题用了自定义字体 ",[1549,3035,2491],{},"，且用户大概率会接着访问「关于页」（代码在 ",[1549,3038,3039],{},"/js/about-page.js","）。在 ",[1549,3042,3043],{},"\u003Chead>"," 中补上合适的 ",[1549,3046,3047],{},"\u003Clink>"," 提示，注意选对 ",[1549,3050,3051],{},"rel"," 和优先级：",[1595,3054,3056],{"className":1597,"code":3055,"language":1600,"meta":1601,"style":1601},"\u003Chead>\n    \u003C!-- 请在这里编写代码：预加载首屏字体 -->\n\n    \u003C!-- 请在这里编写代码：预取关于页代码 -->\n\u003C/head>\n",[1549,3057,3058,3066,3071,3075,3080],{"__ignoreMap":1601},[1605,3059,3060,3062,3064],{"class":1607,"line":1608},[1605,3061,1619],{"class":1618},[1605,3063,2454],{"class":1622},[1605,3065,2457],{"class":1618},[1605,3067,3068],{"class":1607,"line":1615},[1605,3069,3070],{"class":1611},"    \u003C!-- 请在这里编写代码：预加载首屏字体 -->\n",[1605,3072,3073],{"class":1607,"line":1656},[1605,3074,1660],{"emptyLinePlaceholder":1659},[1605,3076,3077],{"class":1607,"line":1663},[1605,3078,3079],{"class":1611},"    \u003C!-- 请在这里编写代码：预取关于页代码 -->\n",[1605,3081,3082,3084,3086],{"class":1607,"line":1669},[1605,3083,2527],{"class":1618},[1605,3085,2454],{"class":1622},[1605,3087,2457],{"class":1618},[1530,3089,3090,3091,3093],{},"完成后想想：两个资源的 ",[1549,3092,3051],{}," 为什么不一样？如果把它们对调，会发生什么？",[1575,3095],{},[1530,3097,3098],{},"🎉 恭喜你已经掌握加载优化技能啦！下一篇我们进入渲染优化，看看页面加载完之后，怎么让它跑得更流畅。",[2547,3100,3101],{},"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 .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 .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sIEYB, html code.shiki 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.shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}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 .sK9QF{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--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}",{"title":1601,"searchDepth":1615,"depth":1615,"links":3103},[3104,3105,3106,3107,3108,3109,3110,3111,3112],{"id":1527,"depth":1615,"text":1528},{"id":1579,"depth":1615,"text":1580},{"id":1771,"depth":1615,"text":1772},{"id":2129,"depth":1615,"text":2130},{"id":2418,"depth":1615,"text":2419},{"id":2699,"depth":1615,"text":2700},{"id":2756,"depth":1615,"text":2757},{"id":2791,"depth":1615,"text":2792},{"id":2849,"depth":1615,"text":2850},"掌握图片懒加载、路由懒加载、预加载与代码分包等常用加载优化手段。","md",null,{},{"title":1468},{"title":1468,"description":3113},"5pKmiYffpg",[3121,3123],{"title":1462,"path":1463,"stem":1464,"description":3122,"children":-1},"了解前端性能优化的意义、核心指标与整体思路，明确本课程的学习路径。",{"title":1472,"path":1473,"stem":1474,"description":3124,"children":-1},"掌握防抖节流、虚拟列表、长列表与高频事件优化技巧，减少页面卡顿。",1784715112318]