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解析完成耗时",[1602,1771,1630],{"class":1619},[1602,1773,1639],{"class":1619},[1602,1775,1723],{"class":1615},[1602,1777,1620],{"class":1619},[1602,1779,1728],{"class":1623},[1602,1781,1627],{"class":1678},[1602,1783,1661],{"class":1615},[1602,1785,1620],{"class":1619},[1602,1787,1788],{"class":1615},"domContentLoadedEventEnd",[1602,1790,1751],{"class":1678},[1602,1792,1691],{"class":1619},[1602,1794,1796,1798,1800,1802,1804,1806,1809,1811,1813,1815,1817,1819,1821,1823,1825,1828,1830],{"class":1604,"line":1795},7,[1602,1797,1704],{"class":1615},[1602,1799,1620],{"class":1619},[1602,1801,1709],{"class":1623},[1602,1803,1627],{"class":1678},[1602,1805,1630],{"class":1619},[1602,1807,1808],{"class":1633},"页面完全加载耗时",[1602,1810,1630],{"class":1619},[1602,1812,1639],{"class":1619},[1602,1814,1723],{"class":1615},[1602,1816,1620],{"class":1619},[1602,1818,1728],{"class":1623},[1602,1820,1627],{"class":1678},[1602,1822,1661],{"class":1615},[1602,1824,1620],{"class":1619},[1602,1826,1827],{"class":1615},"loadEventEnd",[1602,1829,1751],{"class":1678},[1602,1831,1691],{"class":1619},[1602,1833,1835,1838,1840],{"class":1604,"line":1834},8,[1602,1836,1837],{"class":1619},"}",[1602,1839,1688],{"class":1615},[1602,1841,1691],{"class":1619},[1530,1843,1844,1846,1847,1850,1851,1853],{},[1566,1845,1661],{}," 上的字段是加载各节点的时间戳（毫秒），两两相减即得阶段耗时。比如 ",[1566,1848,1849],{},"responseStart - requestStart"," 就是服务器响应耗时，",[1566,1852,1827],{}," 则是页面完全加载的总耗时。",[1530,1855,1856,1857,1590],{},"另一类常用的是 ",[1534,1858,1859],{},"paint（绘制）",[1592,1861,1863],{"className":1594,"code":1862,"filename":1596,"language":1597,"meta":1598,"style":1598},"performance.getEntriesByType('paint').forEach((entry) => {\n    console.log(entry.name, Math.round(entry.startTime));\n    // first-paint：屏幕上第一次画出任何像素\n    // first-contentful-paint：第一次画出文字、图片等实际内容\n});\n",[1566,1864,1865,1904,1942,1947,1952],{"__ignoreMap":1598},[1602,1866,1867,1870,1872,1874,1876,1878,1881,1883,1885,1887,1890,1892,1894,1898,1900,1902],{"class":1604,"line":1605},[1602,1868,1869],{"class":1615},"performance",[1602,1871,1620],{"class":1619},[1602,1873,1675],{"class":1623},[1602,1875,1627],{"class":1615},[1602,1877,1630],{"class":1619},[1602,1879,1880],{"class":1633},"paint",[1602,1882,1630],{"class":1619},[1602,1884,1688],{"class":1615},[1602,1886,1620],{"class":1619},[1602,1888,1889],{"class":1623},"forEach",[1602,1891,1627],{"class":1615},[1602,1893,1627],{"class":1619},[1602,1895,1897],{"class":1896},"sK9QF","entry",[1602,1899,1688],{"class":1619},[1602,1901,1646],{"class":1645},[1602,1903,1649],{"class":1619},[1602,1905,1906,1908,1910,1912,1914,1916,1918,1921,1923,1925,1927,1929,1931,1933,1935,1938,1940],{"class":1604,"line":1612},[1602,1907,1704],{"class":1615},[1602,1909,1620],{"class":1619},[1602,1911,1709],{"class":1623},[1602,1913,1627],{"class":1678},[1602,1915,1897],{"class":1615},[1602,1917,1620],{"class":1619},[1602,1919,1920],{"class":1615},"name",[1602,1922,1639],{"class":1619},[1602,1924,1723],{"class":1615},[1602,1926,1620],{"class":1619},[1602,1928,1728],{"class":1623},[1602,1930,1627],{"class":1678},[1602,1932,1897],{"class":1615},[1602,1934,1620],{"class":1619},[1602,1936,1937],{"class":1615},"startTime",[1602,1939,1751],{"class":1678},[1602,1941,1691],{"class":1619},[1602,1943,1944],{"class":1604,"line":1652},[1602,1945,1946],{"class":1608},"    // first-paint：屏幕上第一次画出任何像素\n",[1602,1948,1949],{"class":1604,"line":1694},[1602,1950,1951],{"class":1608},"    // first-contentful-paint：第一次画出文字、图片等实际内容\n",[1602,1953,1954,1956,1958],{"class":1604,"line":1701},[1602,1955,1837],{"class":1619},[1602,1957,1688],{"class":1615},[1602,1959,1691],{"class":1619},[1530,1961,1962,1964,1965,1968],{},[1566,1963,1937],{}," 是「页面打开后第几毫秒」，可直接使用。其中 ",[1566,1966,1967],{},"first-contentful-paint","（简称 FCP）代表白屏结束、用户看到内容的时刻。",[1970,1971,1972],"warning",{},[1530,1973,1974,1975,1977,1978,1980],{},"一定要在 ",[1566,1976,1634],{}," 事件触发后再读取 navigation 记录。读早了，",[1566,1979,1827],{}," 等字段还是 0，算出来的耗时会是错误的负数或零值。",[1982,1983,1984],"tip",{},[1530,1985,1986,1987,1989,1990,1992],{},"初学阶段记住 ",[1566,1988,1683],{}," 看加载各阶段耗时、",[1566,1991,1880],{}," 看白屏结束时刻就够了，其余字段用到时再查 MDN 文档。",[1571,1994],{},[1525,1996,1998],{"id":1997},"web-vitals-库","🧱 web-vitals 库",[1530,2000,2001,2002,2004,2005,2009],{},"LCP、INP、CLS 三大核心指标靠手写监听很难采准：LCP 随内容绘制不断更新、INP 要跟踪整次访问的所有交互、CLS 要累计每一次布局偏移。Google 官方的 ",[1534,2003,1561],{}," 库把这套逻辑封装成了三个函数。指标的概念和合格标准见 ",[2006,2007,2008],"a",{"href":1463},"性能优化课程"," 的《性能指标与 Lighthouse》，这里只讲采集和上报。",[1530,2011,2012],{},"先安装，以下示例在 Node.js v22 + web-vitals v5.x 下验证：",[1592,2014,2018],{"className":2015,"code":2016,"language":2017,"meta":1598,"style":1598},"language-bash shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","pnpm add web-vitals\n","bash",[1566,2019,2020],{"__ignoreMap":1598},[1602,2021,2022,2026,2029],{"class":1604,"line":1605},[1602,2023,2025],{"class":2024},"sYGMc","pnpm",[1602,2027,2028],{"class":1633}," add",[1602,2030,2031],{"class":1633}," web-vitals\n",[1530,2033,2034,2035,2038],{},"三个函数对应三个指标，回调里的 ",[1566,2036,2037],{},"metric.value"," 就是指标数值：",[1592,2040,2043],{"className":1594,"code":2041,"filename":2042,"language":1597,"meta":1598,"style":1598},"import { onLCP, onINP, onCLS } from 'web-vitals';\n\nonLCP((metric) => console.log('LCP（毫秒）', Math.round(metric.value)));\nonINP((metric) => console.log('INP（毫秒）', Math.round(metric.value)));\nonCLS((metric) => console.log('CLS（无单位分数）', metric.value.toFixed(2)));\n","vitals.js",[1566,2044,2045,2082,2086,2136,2182],{"__ignoreMap":1598},[1602,2046,2047,2051,2054,2057,2059,2062,2064,2067,2070,2073,2076,2078,2080],{"class":1604,"line":1605},[1602,2048,2050],{"class":2049},"s8pZq","import",[1602,2052,2053],{"class":1619}," {",[1602,2055,2056],{"class":1615}," onLCP",[1602,2058,1639],{"class":1619},[1602,2060,2061],{"class":1615}," onINP",[1602,2063,1639],{"class":1619},[1602,2065,2066],{"class":1615}," onCLS",[1602,2068,2069],{"class":1619}," }",[1602,2071,2072],{"class":2049}," from",[1602,2074,2075],{"class":1619}," '",[1602,2077,1561],{"class":1633},[1602,2079,1630],{"class":1619},[1602,2081,1691],{"class":1619},[1602,2083,2084],{"class":1604,"line":1612},[1602,2085,1698],{"emptyLinePlaceholder":1697},[1602,2087,2088,2091,2093,2095,2098,2100,2102,2105,2107,2109,2111,2113,2116,2118,2120,2122,2124,2126,2129,2131,2134],{"class":1604,"line":1652},[1602,2089,2090],{"class":1623},"onLCP",[1602,2092,1627],{"class":1615},[1602,2094,1627],{"class":1619},[1602,2096,2097],{"class":1896},"metric",[1602,2099,1688],{"class":1619},[1602,2101,1646],{"class":1645},[1602,2103,2104],{"class":1615}," console",[1602,2106,1620],{"class":1619},[1602,2108,1709],{"class":1623},[1602,2110,1627],{"class":1615},[1602,2112,1630],{"class":1619},[1602,2114,2115],{"class":1633},"LCP（毫秒）",[1602,2117,1630],{"class":1619},[1602,2119,1639],{"class":1619},[1602,2121,1723],{"class":1615},[1602,2123,1620],{"class":1619},[1602,2125,1728],{"class":1623},[1602,2127,2128],{"class":1615},"(metric",[1602,2130,1620],{"class":1619},[1602,2132,2133],{"class":1615},"value)))",[1602,2135,1691],{"class":1619},[1602,2137,2138,2141,2143,2145,2147,2149,2151,2153,2155,2157,2159,2161,2164,2166,2168,2170,2172,2174,2176,2178,2180],{"class":1604,"line":1694},[1602,2139,2140],{"class":1623},"onINP",[1602,2142,1627],{"class":1615},[1602,2144,1627],{"class":1619},[1602,2146,2097],{"class":1896},[1602,2148,1688],{"class":1619},[1602,2150,1646],{"class":1645},[1602,2152,2104],{"class":1615},[1602,2154,1620],{"class":1619},[1602,2156,1709],{"class":1623},[1602,2158,1627],{"class":1615},[1602,2160,1630],{"class":1619},[1602,2162,2163],{"class":1633},"INP（毫秒）",[1602,2165,1630],{"class":1619},[1602,2167,1639],{"class":1619},[1602,2169,1723],{"class":1615},[1602,2171,1620],{"class":1619},[1602,2173,1728],{"class":1623},[1602,2175,2128],{"class":1615},[1602,2177,1620],{"class":1619},[1602,2179,2133],{"class":1615},[1602,2181,1691],{"class":1619},[1602,2183,2184,2187,2189,2191,2193,2195,2197,2199,2201,2203,2205,2207,2210,2212,2214,2217,2219,2222,2224,2227,2229,2233,2236],{"class":1604,"line":1701},[1602,2185,2186],{"class":1623},"onCLS",[1602,2188,1627],{"class":1615},[1602,2190,1627],{"class":1619},[1602,2192,2097],{"class":1896},[1602,2194,1688],{"class":1619},[1602,2196,1646],{"class":1645},[1602,2198,2104],{"class":1615},[1602,2200,1620],{"class":1619},[1602,2202,1709],{"class":1623},[1602,2204,1627],{"class":1615},[1602,2206,1630],{"class":1619},[1602,2208,2209],{"class":1633},"CLS（无单位分数）",[1602,2211,1630],{"class":1619},[1602,2213,1639],{"class":1619},[1602,2215,2216],{"class":1615}," metric",[1602,2218,1620],{"class":1619},[1602,2220,2221],{"class":1615},"value",[1602,2223,1620],{"class":1619},[1602,2225,2226],{"class":1623},"toFixed",[1602,2228,1627],{"class":1615},[1602,2230,2232],{"class":2231},"smPcV","2",[1602,2234,2235],{"class":1615},")))",[1602,2237,1691],{"class":1619},[1970,2239,2240],{},[1530,2241,2242,2243,2246],{},"这些回调",[1534,2244,2245],{},"不是","页面一加载就触发。像 LCP 这种会不断更新的指标，库会等到页面切到后台或关闭时才上报最终值。本地测试时切一下浏览器标签页再切回来，才能在控制台看到输出，这是正常行为。",[1571,2248],{},[1525,2250,2252],{"id":2251},"上报到服务端","🧱 上报到服务端",[1530,2254,2255,2256,2258],{},"上报直接用上一篇学过的 ",[1566,2257,1568],{},"：页面关闭时也由浏览器保证发出，正好匹配性能指标「页面关闭时才出最终值」的特点。采集加上报的完整最小示例：",[1592,2260,2262],{"className":1594,"code":2261,"filename":2042,"language":1597,"meta":1598,"style":1598},"import { onLCP, onINP, onCLS } from 'web-vitals';\n\nfunction report(metric) {\n    const data = {\n        name: metric.name, // 指标名：LCP / INP / CLS\n        value: Math.round(metric.value), // 取整后上报\n        path: location.pathname, // 哪个页面\n    };\n\n    const body = JSON.stringify(data);\n    navigator.sendBeacon('/api/monitor/performance', new Blob([body], { type: 'application/json' }));\n}\n\nonLCP(report);\nonINP(report);\nonCLS(report);\n",[1566,2263,2264,2292,2296,2312,2323,2342,2370,2390,2395,2400,2427,2484,2490,2495,2505,2514],{"__ignoreMap":1598},[1602,2265,2266,2268,2270,2272,2274,2276,2278,2280,2282,2284,2286,2288,2290],{"class":1604,"line":1605},[1602,2267,2050],{"class":2049},[1602,2269,2053],{"class":1619},[1602,2271,2056],{"class":1615},[1602,2273,1639],{"class":1619},[1602,2275,2061],{"class":1615},[1602,2277,1639],{"class":1619},[1602,2279,2066],{"class":1615},[1602,2281,2069],{"class":1619},[1602,2283,2072],{"class":2049},[1602,2285,2075],{"class":1619},[1602,2287,1561],{"class":1633},[1602,2289,1630],{"class":1619},[1602,2291,1691],{"class":1619},[1602,2293,2294],{"class":1604,"line":1612},[1602,2295,1698],{"emptyLinePlaceholder":1697},[1602,2297,2298,2301,2304,2306,2308,2310],{"class":1604,"line":1652},[1602,2299,2300],{"class":1645},"function",[1602,2302,2303],{"class":1623}," report",[1602,2305,1627],{"class":1619},[1602,2307,2097],{"class":1896},[1602,2309,1688],{"class":1619},[1602,2311,1649],{"class":1619},[1602,2313,2314,2316,2319,2321],{"class":1604,"line":1694},[1602,2315,1655],{"class":1645},[1602,2317,2318],{"class":1615}," data",[1602,2320,1667],{"class":1619},[1602,2322,1649],{"class":1619},[1602,2324,2325,2328,2331,2333,2335,2337,2339],{"class":1604,"line":1701},[1602,2326,2327],{"class":1678},"        name",[1602,2329,2330],{"class":1619},":",[1602,2332,2216],{"class":1615},[1602,2334,1620],{"class":1619},[1602,2336,1920],{"class":1615},[1602,2338,1639],{"class":1619},[1602,2340,2341],{"class":1608}," // 指标名：LCP / INP / CLS\n",[1602,2343,2344,2347,2349,2351,2353,2355,2357,2359,2361,2363,2365,2367],{"class":1604,"line":1756},[1602,2345,2346],{"class":1678},"        value",[1602,2348,2330],{"class":1619},[1602,2350,1723],{"class":1615},[1602,2352,1620],{"class":1619},[1602,2354,1728],{"class":1623},[1602,2356,1627],{"class":1678},[1602,2358,2097],{"class":1615},[1602,2360,1620],{"class":1619},[1602,2362,2221],{"class":1615},[1602,2364,1688],{"class":1678},[1602,2366,1639],{"class":1619},[1602,2368,2369],{"class":1608}," // 取整后上报\n",[1602,2371,2372,2375,2377,2380,2382,2385,2387],{"class":1604,"line":1795},[1602,2373,2374],{"class":1678},"        path",[1602,2376,2330],{"class":1619},[1602,2378,2379],{"class":1615}," location",[1602,2381,1620],{"class":1619},[1602,2383,2384],{"class":1615},"pathname",[1602,2386,1639],{"class":1619},[1602,2388,2389],{"class":1608}," // 哪个页面\n",[1602,2391,2392],{"class":1604,"line":1834},[1602,2393,2394],{"class":1619},"    };\n",[1602,2396,2398],{"class":1604,"line":2397},9,[1602,2399,1698],{"emptyLinePlaceholder":1697},[1602,2401,2403,2405,2408,2410,2413,2415,2418,2420,2423,2425],{"class":1604,"line":2402},10,[1602,2404,1655],{"class":1645},[1602,2406,2407],{"class":1615}," body",[1602,2409,1667],{"class":1619},[1602,2411,2412],{"class":1615}," JSON",[1602,2414,1620],{"class":1619},[1602,2416,2417],{"class":1623},"stringify",[1602,2419,1627],{"class":1678},[1602,2421,2422],{"class":1615},"data",[1602,2424,1688],{"class":1678},[1602,2426,1691],{"class":1619},[1602,2428,2430,2433,2435,2437,2439,2441,2444,2446,2448,2451,2454,2457,2460,2462,2464,2466,2469,2471,2473,2476,2478,2480,2482],{"class":1604,"line":2429},11,[1602,2431,2432],{"class":1615},"    navigator",[1602,2434,1620],{"class":1619},[1602,2436,1568],{"class":1623},[1602,2438,1627],{"class":1678},[1602,2440,1630],{"class":1619},[1602,2442,2443],{"class":1633},"/api/monitor/performance",[1602,2445,1630],{"class":1619},[1602,2447,1639],{"class":1619},[1602,2449,2450],{"class":1619}," new",[1602,2452,2453],{"class":1623}," Blob",[1602,2455,2456],{"class":1678},"([",[1602,2458,2459],{"class":1615},"body",[1602,2461,1664],{"class":1678},[1602,2463,1639],{"class":1619},[1602,2465,2053],{"class":1619},[1602,2467,2468],{"class":1678}," type",[1602,2470,2330],{"class":1619},[1602,2472,2075],{"class":1619},[1602,2474,2475],{"class":1633},"application/json",[1602,2477,1630],{"class":1619},[1602,2479,2069],{"class":1619},[1602,2481,1751],{"class":1678},[1602,2483,1691],{"class":1619},[1602,2485,2487],{"class":1604,"line":2486},12,[1602,2488,2489],{"class":1619},"}\n",[1602,2491,2493],{"class":1604,"line":2492},13,[1602,2494,1698],{"emptyLinePlaceholder":1697},[1602,2496,2498,2500,2503],{"class":1604,"line":2497},14,[1602,2499,2090],{"class":1623},[1602,2501,2502],{"class":1615},"(report)",[1602,2504,1691],{"class":1619},[1602,2506,2508,2510,2512],{"class":1604,"line":2507},15,[1602,2509,2140],{"class":1623},[1602,2511,2502],{"class":1615},[1602,2513,1691],{"class":1619},[1602,2515,2517,2519,2521],{"class":1604,"line":2516},16,[1602,2518,2186],{"class":1623},[1602,2520,2502],{"class":1615},[1602,2522,1691],{"class":1619},[1530,2524,2525,2528],{},[1566,2526,2527],{},"path"," 用于区分页面：不同页面性能差异很大，服务端汇总时要按页面分开统计，混在一起就没有指导意义了。服务端收到 JSON 后入库、按页面和时间聚合即可，存储和看板属于后端范畴，前端把数据采准、发出去就完成了职责。",[1982,2530,2531],{},[1530,2532,2533,2534,2537],{},"Performance API 读到的 FCP、服务器响应耗时也可以放进同一个 ",[1566,2535,2536],{},"report"," 函数一起上报，字段结构保持一致即可。",[1571,2539],{},[1525,2541,2543],{"id":2542},"小节总结","🧾 小节总结",[1546,2545,2546,2549,2558,2572,2577],{},[1549,2547,2548],{},"性能数据上报回答「真实用户端页面快不快」，开发机上的体感判断不出来。",[1549,2550,2551,2552,2554,2555,2557],{},"Performance API 是浏览器内置能力：",[1566,2553,1683],{}," 记录看加载各阶段耗时，",[1566,2556,1880],{}," 记录看白屏结束时刻（FCP）。",[1549,2559,2560,2561,2563,2564,2563,2566,2568,2569,2571],{},"web-vitals 把 LCP、INP、CLS 的采集封装成 ",[1566,2562,2090],{},"、",[1566,2565,2140],{},[1566,2567,2186],{},"，回调里的 ",[1566,2570,2037],{}," 就是指标数值。",[1549,2573,2574,2575,1541],{},"指标回调常在页面隐藏或关闭时才触发，所以上报要用页面关闭也不丢数据的 ",[1566,2576,1568],{},[1549,2578,2579,2580,2582],{},"上报带上 ",[1566,2581,2527],{}," 等上下文，服务端才能按页面维度统计。",[1571,2584],{},[1525,2586,2588],{"id":2587},"知识问答","❓ 知识问答",[1530,2590,2591],{},[1534,2592,2593,2594,2596],{},"Q1：为什么我注册了 ",[1566,2595,2090],{},"，页面加载完控制台却没有输出？",[1530,2598,2599],{},"A：正常行为。LCP 会随内容绘制不断更新，库等页面切到后台或关闭时才回调最终值，本地测试切换一下标签页即可触发。",[1530,2601,2602],{},[1534,2603,2604,2605,2607,2608,2611],{},"Q2：上报为什么用 ",[1566,2606,1568],{}," 而不是 ",[1566,2609,2610],{},"fetch","？",[1530,2613,2614,2615,2617,2618,2620],{},"A：性能指标常在页面关闭那一刻才产生，此时浏览器可能取消进行中的 ",[1566,2616,2610],{},"，导致数据丢失；",[1566,2619,1568],{}," 由浏览器接管保证发出。详细对比见上一篇《埋点与数据上报》。",[1530,2622,2623],{},[1534,2624,2625],{},"Q3：每个用户每次访问都上报，数据量会不会太大？",[1530,2627,2628,2629,2632,2633,2636],{},"A：可以",[1534,2630,2631],{},"采样上报","，比如用 ",[1566,2634,2635],{},"Math.random() \u003C 0.1"," 只让约一成用户执行上报，统计上仍能反映整体情况，比例按访问量调整。",[1571,2638],{},[1525,2640,2642],{"id":2641},"小练习","🧪 小练习",[1530,2644,2645,2648],{},[1534,2646,2647],{},"练习一","：补全下面的代码，用 Performance API 计算「服务器响应耗时」（从发出请求到收到第一个字节），取整后打印：",[1592,2650,2652],{"className":1594,"code":2651,"language":1597,"meta":1598,"style":1598},"window.addEventListener('load', () => {\n    const [nav] = performance.getEntriesByType('navigation');\n\n    // 请在这里编写代码：计算并打印服务器响应耗时\n});\n",[1566,2653,2654,2678,2708,2712,2717],{"__ignoreMap":1598},[1602,2655,2656,2658,2660,2662,2664,2666,2668,2670,2672,2674,2676],{"class":1604,"line":1605},[1602,2657,1616],{"class":1615},[1602,2659,1620],{"class":1619},[1602,2661,1624],{"class":1623},[1602,2663,1627],{"class":1615},[1602,2665,1630],{"class":1619},[1602,2667,1634],{"class":1633},[1602,2669,1630],{"class":1619},[1602,2671,1639],{"class":1619},[1602,2673,1642],{"class":1619},[1602,2675,1646],{"class":1645},[1602,2677,1649],{"class":1619},[1602,2679,2680,2682,2684,2686,2688,2690,2692,2694,2696,2698,2700,2702,2704,2706],{"class":1604,"line":1612},[1602,2681,1655],{"class":1645},[1602,2683,1658],{"class":1619},[1602,2685,1661],{"class":1615},[1602,2687,1664],{"class":1619},[1602,2689,1667],{"class":1619},[1602,2691,1670],{"class":1615},[1602,2693,1620],{"class":1619},[1602,2695,1675],{"class":1623},[1602,2697,1627],{"class":1678},[1602,2699,1630],{"class":1619},[1602,2701,1683],{"class":1633},[1602,2703,1630],{"class":1619},[1602,2705,1688],{"class":1678},[1602,2707,1691],{"class":1619},[1602,2709,2710],{"class":1604,"line":1652},[1602,2711,1698],{"emptyLinePlaceholder":1697},[1602,2713,2714],{"class":1604,"line":1694},[1602,2715,2716],{"class":1608},"    // 请在这里编写代码：计算并打印服务器响应耗时\n",[1602,2718,2719,2721,2723],{"class":1604,"line":1701},[1602,2720,1837],{"class":1619},[1602,2722,1688],{"class":1615},[1602,2724,1691],{"class":1619},[1530,2726,2727,2730,2731,2733,2734,2737,2738,2741],{},[1534,2728,2729],{},"练习二","：给 ",[1566,2732,2536],{}," 的数据加一个 ",[1566,2735,2736],{},"ua"," 字段（值为 ",[1566,2739,2740],{},"navigator.userAgent","），方便服务端按浏览器区分数据：",[1592,2743,2745],{"className":1594,"code":2744,"language":1597,"meta":1598,"style":1598},"function report(metric) {\n    const data = {\n        name: metric.name,\n        value: Math.round(metric.value),\n        path: location.pathname,\n        // 请在这里编写代码：补充 ua 字段\n    };\n\n    const body = JSON.stringify(data);\n    navigator.sendBeacon('/api/monitor/performance', new Blob([body], { type: 'application/json' }));\n}\n",[1566,2746,2747,2761,2771,2786,2810,2824,2829,2833,2837,2859,2907],{"__ignoreMap":1598},[1602,2748,2749,2751,2753,2755,2757,2759],{"class":1604,"line":1605},[1602,2750,2300],{"class":1645},[1602,2752,2303],{"class":1623},[1602,2754,1627],{"class":1619},[1602,2756,2097],{"class":1896},[1602,2758,1688],{"class":1619},[1602,2760,1649],{"class":1619},[1602,2762,2763,2765,2767,2769],{"class":1604,"line":1612},[1602,2764,1655],{"class":1645},[1602,2766,2318],{"class":1615},[1602,2768,1667],{"class":1619},[1602,2770,1649],{"class":1619},[1602,2772,2773,2775,2777,2779,2781,2783],{"class":1604,"line":1652},[1602,2774,2327],{"class":1678},[1602,2776,2330],{"class":1619},[1602,2778,2216],{"class":1615},[1602,2780,1620],{"class":1619},[1602,2782,1920],{"class":1615},[1602,2784,2785],{"class":1619},",\n",[1602,2787,2788,2790,2792,2794,2796,2798,2800,2802,2804,2806,2808],{"class":1604,"line":1694},[1602,2789,2346],{"class":1678},[1602,2791,2330],{"class":1619},[1602,2793,1723],{"class":1615},[1602,2795,1620],{"class":1619},[1602,2797,1728],{"class":1623},[1602,2799,1627],{"class":1678},[1602,2801,2097],{"class":1615},[1602,2803,1620],{"class":1619},[1602,2805,2221],{"class":1615},[1602,2807,1688],{"class":1678},[1602,2809,2785],{"class":1619},[1602,2811,2812,2814,2816,2818,2820,2822],{"class":1604,"line":1701},[1602,2813,2374],{"class":1678},[1602,2815,2330],{"class":1619},[1602,2817,2379],{"class":1615},[1602,2819,1620],{"class":1619},[1602,2821,2384],{"class":1615},[1602,2823,2785],{"class":1619},[1602,2825,2826],{"class":1604,"line":1756},[1602,2827,2828],{"class":1608},"        // 请在这里编写代码：补充 ua 字段\n",[1602,2830,2831],{"class":1604,"line":1795},[1602,2832,2394],{"class":1619},[1602,2834,2835],{"class":1604,"line":1834},[1602,2836,1698],{"emptyLinePlaceholder":1697},[1602,2838,2839,2841,2843,2845,2847,2849,2851,2853,2855,2857],{"class":1604,"line":2397},[1602,2840,1655],{"class":1645},[1602,2842,2407],{"class":1615},[1602,2844,1667],{"class":1619},[1602,2846,2412],{"class":1615},[1602,2848,1620],{"class":1619},[1602,2850,2417],{"class":1623},[1602,2852,1627],{"class":1678},[1602,2854,2422],{"class":1615},[1602,2856,1688],{"class":1678},[1602,2858,1691],{"class":1619},[1602,2860,2861,2863,2865,2867,2869,2871,2873,2875,2877,2879,2881,2883,2885,2887,2889,2891,2893,2895,2897,2899,2901,2903,2905],{"class":1604,"line":2402},[1602,2862,2432],{"class":1615},[1602,2864,1620],{"class":1619},[1602,2866,1568],{"class":1623},[1602,2868,1627],{"class":1678},[1602,2870,1630],{"class":1619},[1602,2872,2443],{"class":1633},[1602,2874,1630],{"class":1619},[1602,2876,1639],{"class":1619},[1602,2878,2450],{"class":1619},[1602,2880,2453],{"class":1623},[1602,2882,2456],{"class":1678},[1602,2884,2459],{"class":1615},[1602,2886,1664],{"class":1678},[1602,2888,1639],{"class":1619},[1602,2890,2053],{"class":1619},[1602,2892,2468],{"class":1678},[1602,2894,2330],{"class":1619},[1602,2896,2075],{"class":1619},[1602,2898,2475],{"class":1633},[1602,2900,1630],{"class":1619},[1602,2902,2069],{"class":1619},[1602,2904,1751],{"class":1678},[1602,2906,1691],{"class":1619},[1602,2908,2909],{"class":1604,"line":2429},[1602,2910,2489],{"class":1619},[1530,2912,2913],{},"完成后想想：如果想按「移动端 / PC 端」分开统计，除了上报完整的 UA 字符串，有没有更省事的做法？",[1571,2915],{},[1530,2917,2918],{},"🎉 恭喜你已经掌握性能数据上报技能啦！下一篇我们看看如何用 Sentry 这类监控平台，几行配置就把错误、性能监控一站式接入。",[2920,2921,2922],"style",{},"html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-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.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 .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 .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":1598,"searchDepth":1612,"depth":1612,"links":2924},[2925,2926,2927,2928,2929,2930,2931],{"id":1527,"depth":1612,"text":1528},{"id":1575,"depth":1612,"text":1576},{"id":1997,"depth":1612,"text":1998},{"id":2251,"depth":1612,"text":2252},{"id":2542,"depth":1612,"text":2543},{"id":2587,"depth":1612,"text":2588},{"id":2641,"depth":1612,"text":2642},"掌握用 Performance API 和 web-vitals 库采集性能指标，并上报到服务端的基本流程。","md",null,{},{"title":1508},{"title":1508,"description":2932},"88s1t4SVIf",[2940,2942],{"title":1504,"path":1505,"stem":1506,"description":2941,"children":-1},"掌握常见的埋点方式与数据上报手段，学会用 sendBeacon 可靠地把数据发到服务端。",{"title":1512,"path":1513,"stem":1514,"description":2943,"children":-1},"学会在 Vue3 项目中接入 Sentry，实现错误自动上报、来源映射与告警通知。",1784715112227]