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()",[1594,1726,1727],{"class":1607}," =>",[1594,1729,1632],{"class":1615},[1594,1731,1733,1736,1738,1740,1742,1744,1746],{"class":1596,"line":1732},7,[1594,1734,1735],{"class":1611},"    track",[1594,1737,1616],{"class":1648},[1594,1739,1651],{"class":1615},[1594,1741,1717],{"class":1654},[1594,1743,1651],{"class":1615},[1594,1745,1623],{"class":1615},[1594,1747,1632],{"class":1615},[1594,1749,1751,1754,1757,1760,1763,1765],{"class":1596,"line":1750},8,[1594,1752,1753],{"class":1648},"        button",[1594,1755,1756],{"class":1615},":",[1594,1758,1759],{"class":1615}," '",[1594,1761,1762],{"class":1654},"buy",[1594,1764,1651],{"class":1615},[1594,1766,1767],{"class":1615},",\n",[1594,1769,1771,1774,1776,1779,1781,1784],{"class":1596,"line":1770},9,[1594,1772,1773],{"class":1648},"        page",[1594,1775,1756],{"class":1615},[1594,1777,1778],{"class":1638}," location",[1594,1780,1642],{"class":1615},[1594,1782,1783],{"class":1638},"pathname",[1594,1785,1767],{"class":1615},[1594,1787,1789,1792,1794],{"class":1596,"line":1788},10,[1594,1790,1791],{"class":1615},"    }",[1594,1793,1629],{"class":1648},[1594,1795,1671],{"class":1615},[1594,1797,1799,1802,1804],{"class":1596,"line":1798},11,[1594,1800,1801],{"class":1615},"}",[1594,1803,1629],{"class":1638},[1594,1805,1671],{"class":1615},[1531,1807,1808],{},"埋哪个点、带什么数据完全由你控制，所以精确；代价是每个点都要写代码，需求变了还得改代码、发版本。",[1531,1810,1811,1814],{},[1535,1812,1813],{},"无埋点（全埋点）","：接入 SDK 自动收集页面上所有点击、浏览行为，事后在后台圈选关心的元素。省事且能回溯，但收集到的多是「某个 div 被点了」这类信息，精细分析时不如手动埋点清晰。",[1816,1817,1818],"tip",{},[1531,1819,1820],{},"实际项目常搭配使用：下单、支付等核心指标用手动埋点，粗放的行为分析用无埋点。",[1558,1822],{},[1526,1824,1826],{"id":1825},"曝光埋点统计被看见","🧱 曝光埋点：统计「被看见」",[1531,1828,1829,1832,1833,1837],{},[1535,1830,1831],{},"曝光埋点统计「模块有没有进入过可视区域」","，用 IntersectionObserver 实现：元素进入可视区域时上报一次。这个 API 在 ",[1834,1835,1836],"a",{"href":1463},"性能优化课程"," 的懒加载一篇详细讲过，这里直接用：",[1584,1839,1844],{"className":1840,"code":1841,"filename":1842,"language":1843,"meta":1590,"style":1590},"language-html shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003C!-- 要统计曝光的 banner -->\n\u003Cdiv class=\"banner\" data-track=\"home-banner\">夏日活动\u003C/div>\n","index.html","html",[1553,1845,1846,1851],{"__ignoreMap":1590},[1594,1847,1848],{"class":1596,"line":1597},[1594,1849,1850],{"class":1600},"\u003C!-- 要统计曝光的 banner -->\n",[1594,1852,1853,1856,1859,1862,1865,1868,1871,1873,1876,1878,1880,1883,1885,1888,1891,1894,1896],{"class":1596,"line":1604},[1594,1854,1855],{"class":1615},"\u003C",[1594,1857,1858],{"class":1648},"div",[1594,1860,1861],{"class":1607}," class",[1594,1863,1864],{"class":1615},"=",[1594,1866,1867],{"class":1615},"\"",[1594,1869,1870],{"class":1654},"banner",[1594,1872,1867],{"class":1615},[1594,1874,1875],{"class":1607}," data-track",[1594,1877,1864],{"class":1615},[1594,1879,1867],{"class":1615},[1594,1881,1882],{"class":1654},"home-banner",[1594,1884,1867],{"class":1615},[1594,1886,1887],{"class":1615},">",[1594,1889,1890],{"class":1638},"夏日活动",[1594,1892,1893],{"class":1615},"\u003C/",[1594,1895,1858],{"class":1648},[1594,1897,1898],{"class":1615},">\n",[1584,1900,1903],{"className":1586,"code":1901,"filename":1902,"language":1589,"meta":1590,"style":1590},"const 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            track('exposure', {\n                module: entry.target.dataset.track,\n                page: location.pathname,\n            });\n            observer.unobserve(entry.target); // 只统计一次，不再监听\n        }\n    });\n});\n\ndocument.querySelectorAll('.banner').forEach((el) => {\n    observer.observe(el);\n});\n","exposure.js",[1553,1904,1905,1934,1957,1962,1984,2002,2029,2044,2053,2079,2084,2092,2101,2106,2144,2163],{"__ignoreMap":1590},[1594,1906,1907,1910,1913,1915,1918,1921,1923,1925,1928,1930,1932],{"class":1596,"line":1597},[1594,1908,1909],{"class":1607},"const",[1594,1911,1912],{"class":1638}," observer ",[1594,1914,1864],{"class":1615},[1594,1916,1917],{"class":1615}," new",[1594,1919,1920],{"class":1611}," IntersectionObserver",[1594,1922,1616],{"class":1638},[1594,1924,1616],{"class":1615},[1594,1926,1927],{"class":1619},"entries",[1594,1929,1629],{"class":1615},[1594,1931,1727],{"class":1607},[1594,1933,1632],{"class":1615},[1594,1935,1936,1939,1941,1944,1946,1948,1951,1953,1955],{"class":1596,"line":1604},[1594,1937,1938],{"class":1638},"    entries",[1594,1940,1642],{"class":1615},[1594,1942,1943],{"class":1611},"forEach",[1594,1945,1616],{"class":1648},[1594,1947,1616],{"class":1615},[1594,1949,1950],{"class":1619},"entry",[1594,1952,1629],{"class":1615},[1594,1954,1727],{"class":1607},[1594,1956,1632],{"class":1615},[1594,1958,1959],{"class":1596,"line":1635},[1594,1960,1961],{"class":1600},"        // isIntersecting 为 true，表示元素进入可视区域了\n",[1594,1963,1964,1968,1971,1973,1975,1978,1981],{"class":1596,"line":1674},[1594,1965,1967],{"class":1966},"s8pZq","        if",[1594,1969,1970],{"class":1648}," (",[1594,1972,1950],{"class":1638},[1594,1974,1642],{"class":1615},[1594,1976,1977],{"class":1638},"isIntersecting",[1594,1979,1980],{"class":1648},") ",[1594,1982,1983],{"class":1615},"{\n",[1594,1985,1986,1989,1991,1993,1996,1998,2000],{"class":1596,"line":1680},[1594,1987,1988],{"class":1611},"            track",[1594,1990,1616],{"class":1648},[1594,1992,1651],{"class":1615},[1594,1994,1995],{"class":1654},"exposure",[1594,1997,1651],{"class":1615},[1594,1999,1623],{"class":1615},[1594,2001,1632],{"class":1615},[1594,2003,2004,2007,2009,2012,2014,2017,2019,2022,2024,2027],{"class":1596,"line":1687},[1594,2005,2006],{"class":1648},"                module",[1594,2008,1756],{"class":1615},[1594,2010,2011],{"class":1638}," entry",[1594,2013,1642],{"class":1615},[1594,2015,2016],{"class":1638},"target",[1594,2018,1642],{"class":1615},[1594,2020,2021],{"class":1638},"dataset",[1594,2023,1642],{"class":1615},[1594,2025,2026],{"class":1638},"track",[1594,2028,1767],{"class":1615},[1594,2030,2031,2034,2036,2038,2040,2042],{"class":1596,"line":1732},[1594,2032,2033],{"class":1648},"                page",[1594,2035,1756],{"class":1615},[1594,2037,1778],{"class":1638},[1594,2039,1642],{"class":1615},[1594,2041,1783],{"class":1638},[1594,2043,1767],{"class":1615},[1594,2045,2046,2049,2051],{"class":1596,"line":1750},[1594,2047,2048],{"class":1615},"            }",[1594,2050,1629],{"class":1648},[1594,2052,1671],{"class":1615},[1594,2054,2055,2058,2060,2063,2065,2067,2069,2071,2073,2076],{"class":1596,"line":1770},[1594,2056,2057],{"class":1638},"            observer",[1594,2059,1642],{"class":1615},[1594,2061,2062],{"class":1611},"unobserve",[1594,2064,1616],{"class":1648},[1594,2066,1950],{"class":1638},[1594,2068,1642],{"class":1615},[1594,2070,2016],{"class":1638},[1594,2072,1629],{"class":1648},[1594,2074,2075],{"class":1615},";",[1594,2077,2078],{"class":1600}," // 只统计一次，不再监听\n",[1594,2080,2081],{"class":1596,"line":1788},[1594,2082,2083],{"class":1615},"        }\n",[1594,2085,2086,2088,2090],{"class":1596,"line":1798},[1594,2087,1791],{"class":1615},[1594,2089,1629],{"class":1648},[1594,2091,1671],{"class":1615},[1594,2093,2095,2097,2099],{"class":1596,"line":2094},12,[1594,2096,1801],{"class":1615},[1594,2098,1629],{"class":1638},[1594,2100,1671],{"class":1615},[1594,2102,2104],{"class":1596,"line":2103},13,[1594,2105,1684],{"emptyLinePlaceholder":1683},[1594,2107,2109,2111,2113,2116,2118,2120,2123,2125,2127,2129,2131,2133,2135,2138,2140,2142],{"class":1596,"line":2108},14,[1594,2110,7],{"class":1638},[1594,2112,1642],{"class":1615},[1594,2114,2115],{"class":1611},"querySelectorAll",[1594,2117,1616],{"class":1638},[1594,2119,1651],{"class":1615},[1594,2121,2122],{"class":1654},".banner",[1594,2124,1651],{"class":1615},[1594,2126,1629],{"class":1638},[1594,2128,1642],{"class":1615},[1594,2130,1943],{"class":1611},[1594,2132,1616],{"class":1638},[1594,2134,1616],{"class":1615},[1594,2136,2137],{"class":1619},"el",[1594,2139,1629],{"class":1615},[1594,2141,1727],{"class":1607},[1594,2143,1632],{"class":1615},[1594,2145,2147,2150,2152,2155,2157,2159,2161],{"class":1596,"line":2146},15,[1594,2148,2149],{"class":1638},"    observer",[1594,2151,1642],{"class":1615},[1594,2153,2154],{"class":1611},"observe",[1594,2156,1616],{"class":1648},[1594,2158,2137],{"class":1638},[1594,2160,1629],{"class":1648},[1594,2162,1671],{"class":1615},[1594,2164,2166,2168,2170],{"class":1596,"line":2165},16,[1594,2167,1801],{"class":1615},[1594,2169,1629],{"class":1638},[1594,2171,1671],{"class":1615},[1531,2173,2174,2175,2177],{},"注意 ",[1553,2176,2062],{}," 这行：不取消监听，用户反复滚动经过时同一个 banner 会被重复统计。",[1558,2179],{},[1526,2181,2183],{"id":2182},"数据上报手段","🧱 数据上报手段",[1531,2185,2186,2192],{},[1535,2187,2188,2189],{},"埋点上报优先用 ",[1553,2190,2191],{},"sendBeacon","。数据常在用户离开页面那一刻才发（比如停留时长），而页面一旦卸载，浏览器会取消还没发完的普通异步请求，数据就丢了。常见三种手段：",[1531,2194,2195,2198,2199,2202,2203,2206],{},[1535,2196,2197],{},"图片打点","：创建 ",[1553,2200,2201],{},"Image"," 对象，把数据拼在 URL 参数里，设置 ",[1553,2204,2205],{},"src"," 触发一次 GET 请求：",[1584,2208,2211],{"className":1586,"code":2209,"filename":2210,"language":1589,"meta":1590,"style":1590},"function report(data) {\n    const img = new Image();\n    // 服务端收到这个请求就算一条数据，返回一张 1x1 像素的空白图\n    img.src = '/collect?data=' + encodeURIComponent(JSON.stringify(data));\n}\n","report-image.js",[1553,2212,2213,2229,2250,2255,2298],{"__ignoreMap":1590},[1594,2214,2215,2217,2220,2222,2225,2227],{"class":1596,"line":1597},[1594,2216,1608],{"class":1607},[1594,2218,2219],{"class":1611}," report",[1594,2221,1616],{"class":1615},[1594,2223,2224],{"class":1619},"data",[1594,2226,1629],{"class":1615},[1594,2228,1632],{"class":1615},[1594,2230,2231,2234,2237,2240,2242,2245,2248],{"class":1596,"line":1604},[1594,2232,2233],{"class":1607},"    const",[1594,2235,2236],{"class":1638}," img",[1594,2238,2239],{"class":1615}," =",[1594,2241,1917],{"class":1615},[1594,2243,2244],{"class":1611}," Image",[1594,2246,2247],{"class":1648},"()",[1594,2249,1671],{"class":1615},[1594,2251,2252],{"class":1596,"line":1635},[1594,2253,2254],{"class":1600},"    // 服务端收到这个请求就算一条数据，返回一张 1x1 像素的空白图\n",[1594,2256,2257,2260,2262,2264,2266,2268,2271,2273,2276,2279,2281,2284,2286,2289,2291,2293,2296],{"class":1596,"line":1674},[1594,2258,2259],{"class":1638},"    img",[1594,2261,1642],{"class":1615},[1594,2263,2205],{"class":1638},[1594,2265,2239],{"class":1615},[1594,2267,1759],{"class":1615},[1594,2269,2270],{"class":1654},"/collect?data=",[1594,2272,1651],{"class":1615},[1594,2274,2275],{"class":1615}," +",[1594,2277,2278],{"class":1611}," encodeURIComponent",[1594,2280,1616],{"class":1648},[1594,2282,2283],{"class":1638},"JSON",[1594,2285,1642],{"class":1615},[1594,2287,2288],{"class":1611},"stringify",[1594,2290,1616],{"class":1648},[1594,2292,2224],{"class":1638},[1594,2294,2295],{"class":1648},"))",[1594,2297,1671],{"class":1615},[1594,2299,2300],{"class":1596,"line":1680},[1594,2301,1677],{"class":1615},[1531,2303,2304],{},"简单、天然跨域，但只能发 GET、受 URL 长度限制，请求成没成功也无从得知。",[1531,2306,2307,2310],{},[1535,2308,2309],{},"fetch","：灵活可控，但页面卸载时没发完的请求会被取消，不适合离开页面时上报。",[1531,2312,2313,2315],{},[1535,2314,2191],{},"：浏览器专为「页面卸载时也要把数据发出去」设计的 API：",[1584,2317,2320],{"className":1586,"code":2318,"filename":2319,"language":1589,"meta":1590,"style":1590},"function report(data) {\n    const blob = new Blob([JSON.stringify(data)], { type: 'application/json' });\n    navigator.sendBeacon('/collect', blob);\n}\n","report-beacon.js",[1553,2321,2322,2336,2390,2416],{"__ignoreMap":1590},[1594,2323,2324,2326,2328,2330,2332,2334],{"class":1596,"line":1597},[1594,2325,1608],{"class":1607},[1594,2327,2219],{"class":1611},[1594,2329,1616],{"class":1615},[1594,2331,2224],{"class":1619},[1594,2333,1629],{"class":1615},[1594,2335,1632],{"class":1615},[1594,2337,2338,2340,2343,2345,2347,2350,2353,2355,2357,2359,2361,2363,2366,2368,2371,2374,2376,2378,2381,2383,2386,2388],{"class":1596,"line":1604},[1594,2339,2233],{"class":1607},[1594,2341,2342],{"class":1638}," blob",[1594,2344,2239],{"class":1615},[1594,2346,1917],{"class":1615},[1594,2348,2349],{"class":1611}," Blob",[1594,2351,2352],{"class":1648},"([",[1594,2354,2283],{"class":1638},[1594,2356,1642],{"class":1615},[1594,2358,2288],{"class":1611},[1594,2360,1616],{"class":1648},[1594,2362,2224],{"class":1638},[1594,2364,2365],{"class":1648},")]",[1594,2367,1623],{"class":1615},[1594,2369,2370],{"class":1615}," {",[1594,2372,2373],{"class":1648}," type",[1594,2375,1756],{"class":1615},[1594,2377,1759],{"class":1615},[1594,2379,2380],{"class":1654},"application/json",[1594,2382,1651],{"class":1615},[1594,2384,2385],{"class":1615}," }",[1594,2387,1629],{"class":1648},[1594,2389,1671],{"class":1615},[1594,2391,2392,2395,2397,2399,2401,2403,2406,2408,2410,2412,2414],{"class":1596,"line":1635},[1594,2393,2394],{"class":1638},"    navigator",[1594,2396,1642],{"class":1615},[1594,2398,2191],{"class":1611},[1594,2400,1616],{"class":1648},[1594,2402,1651],{"class":1615},[1594,2404,2405],{"class":1654},"/collect",[1594,2407,1651],{"class":1615},[1594,2409,1623],{"class":1615},[1594,2411,2342],{"class":1638},[1594,2413,1629],{"class":1648},[1594,2415,1671],{"class":1615},[1594,2417,2418],{"class":1596,"line":1674},[1594,2419,1677],{"class":1615},[1531,2421,2422],{},"调用后浏览器接管这次发送、排队处理，用户立刻关闭页面，数据也会在后台继续发出。就像把包裹交给快递员，之后的路不用你管。",[2424,2425,2426,2442],"table",{},[2427,2428,2429],"thead",{},[2430,2431,2432,2436,2438,2440],"tr",{},[2433,2434,2435],"th",{},"对比项",[2433,2437,2197],{},[2433,2439,2309],{},[2433,2441,2191],{},[2443,2444,2445,2460,2474,2488],"tbody",{},[2430,2446,2447,2451,2454,2457],{},[2448,2449,2450],"td",{},"请求方式",[2448,2452,2453],{},"只能 GET",[2448,2455,2456],{},"任意",[2448,2458,2459],{},"POST",[2430,2461,2462,2465,2468,2471],{},[2448,2463,2464],{},"页面关闭时",[2448,2466,2467],{},"可能丢失",[2448,2469,2470],{},"大概率被取消",[2448,2472,2473],{},"浏览器保证继续发送",[2430,2475,2476,2479,2482,2485],{},[2448,2477,2478],{},"数据大小",[2448,2480,2481],{},"受 URL 长度限制",[2448,2483,2484],{},"较大",[2448,2486,2487],{},"有上限（约 64KB）",[2430,2489,2490,2493,2496,2499],{},[2448,2491,2492],{},"适用场景",[2448,2494,2495],{},"简单计数、兼容老站",[2448,2497,2498],{},"常规接口交互",[2448,2500,2501],{},"埋点、日志上报",[1531,2503,2504],{},"需要拿响应结果做后续处理的普通接口，继续用 fetch。",[2506,2507,2508],"warning",{},[1531,2509,2510,2512,2513,2516,2517,2520],{},[1553,2511,2191],{}," 返回 ",[1553,2514,2515],{},"true"," 只表示数据成功进入浏览器的发送队列，",[1535,2518,2519],{},"不代表服务端一定收到了","。可靠性要求高的数据，服务端要做好去重和补录的容灾设计。",[1558,2522],{},[1526,2524,2526],{"id":2525},"串起来一个最小可用的埋点工具","🛠 串起来：一个最小可用的埋点工具",[1584,2528,2530],{"className":1586,"code":2529,"filename":1588,"language":1589,"meta":1590,"style":1590},"// 公共信息：每条数据都带上，省去每次手写\nconst common = {\n    page: location.pathname,\n    time: Date.now(),\n};\n\n// 统一上报：优先 sendBeacon，不支持的旧环境降级 fetch\nfunction report(data) {\n    const body = JSON.stringify(data);\n    if (navigator.sendBeacon) {\n        navigator.sendBeacon('/collect', new Blob([body], { type: 'application/json' }));\n    } else {\n        fetch('/collect', { method: 'POST', body, keepalive: true });\n    }\n}\n\n// 对外暴露的采集函数\nfunction track(event, data = {}) {\n    report({ event, ...common, ...data });\n}\n\n// 点击埋点\ndocument.querySelector('#buy-btn').addEventListener('click', () => {\n    track('click', { button: 'buy' });\n});\n\n// 页面离开前，上报停留时长\nconst start = Date.now();\nwindow.addEventListener('pagehide', () => {\n    track('stay', { duration: Math.round((Date.now() - start) / 1000) });\n});\n",[1553,2531,2532,2537,2548,2563,2582,2587,2591,2596,2610,2634,2652,2703,2712,2761,2766,2770,2774,2780,2802,2835,2840,2845,2851,2890,2924,2933,2938,2944,2964,2991,3058],{"__ignoreMap":1590},[1594,2533,2534],{"class":1596,"line":1597},[1594,2535,2536],{"class":1600},"// 公共信息：每条数据都带上，省去每次手写\n",[1594,2538,2539,2541,2544,2546],{"class":1596,"line":1604},[1594,2540,1909],{"class":1607},[1594,2542,2543],{"class":1638}," common ",[1594,2545,1864],{"class":1615},[1594,2547,1632],{"class":1615},[1594,2549,2550,2553,2555,2557,2559,2561],{"class":1596,"line":1635},[1594,2551,2552],{"class":1648},"    page",[1594,2554,1756],{"class":1615},[1594,2556,1778],{"class":1638},[1594,2558,1642],{"class":1615},[1594,2560,1783],{"class":1638},[1594,2562,1767],{"class":1615},[1594,2564,2565,2568,2570,2573,2575,2578,2580],{"class":1596,"line":1674},[1594,2566,2567],{"class":1648},"    time",[1594,2569,1756],{"class":1615},[1594,2571,2572],{"class":1638}," Date",[1594,2574,1642],{"class":1615},[1594,2576,2577],{"class":1611},"now",[1594,2579,2247],{"class":1638},[1594,2581,1767],{"class":1615},[1594,2583,2584],{"class":1596,"line":1680},[1594,2585,2586],{"class":1615},"};\n",[1594,2588,2589],{"class":1596,"line":1687},[1594,2590,1684],{"emptyLinePlaceholder":1683},[1594,2592,2593],{"class":1596,"line":1732},[1594,2594,2595],{"class":1600},"// 统一上报：优先 sendBeacon，不支持的旧环境降级 fetch\n",[1594,2597,2598,2600,2602,2604,2606,2608],{"class":1596,"line":1750},[1594,2599,1608],{"class":1607},[1594,2601,2219],{"class":1611},[1594,2603,1616],{"class":1615},[1594,2605,2224],{"class":1619},[1594,2607,1629],{"class":1615},[1594,2609,1632],{"class":1615},[1594,2611,2612,2614,2617,2619,2622,2624,2626,2628,2630,2632],{"class":1596,"line":1770},[1594,2613,2233],{"class":1607},[1594,2615,2616],{"class":1638}," body",[1594,2618,2239],{"class":1615},[1594,2620,2621],{"class":1638}," JSON",[1594,2623,1642],{"class":1615},[1594,2625,2288],{"class":1611},[1594,2627,1616],{"class":1648},[1594,2629,2224],{"class":1638},[1594,2631,1629],{"class":1648},[1594,2633,1671],{"class":1615},[1594,2635,2636,2639,2641,2644,2646,2648,2650],{"class":1596,"line":1788},[1594,2637,2638],{"class":1966},"    if",[1594,2640,1970],{"class":1648},[1594,2642,2643],{"class":1638},"navigator",[1594,2645,1642],{"class":1615},[1594,2647,2191],{"class":1638},[1594,2649,1980],{"class":1648},[1594,2651,1983],{"class":1615},[1594,2653,2654,2657,2659,2661,2663,2665,2667,2669,2671,2673,2675,2677,2680,2683,2685,2687,2689,2691,2693,2695,2697,2699,2701],{"class":1596,"line":1798},[1594,2655,2656],{"class":1638},"        navigator",[1594,2658,1642],{"class":1615},[1594,2660,2191],{"class":1611},[1594,2662,1616],{"class":1648},[1594,2664,1651],{"class":1615},[1594,2666,2405],{"class":1654},[1594,2668,1651],{"class":1615},[1594,2670,1623],{"class":1615},[1594,2672,1917],{"class":1615},[1594,2674,2349],{"class":1611},[1594,2676,2352],{"class":1648},[1594,2678,2679],{"class":1638},"body",[1594,2681,2682],{"class":1648},"]",[1594,2684,1623],{"class":1615},[1594,2686,2370],{"class":1615},[1594,2688,2373],{"class":1648},[1594,2690,1756],{"class":1615},[1594,2692,1759],{"class":1615},[1594,2694,2380],{"class":1654},[1594,2696,1651],{"class":1615},[1594,2698,2385],{"class":1615},[1594,2700,2295],{"class":1648},[1594,2702,1671],{"class":1615},[1594,2704,2705,2707,2710],{"class":1596,"line":2094},[1594,2706,1791],{"class":1615},[1594,2708,2709],{"class":1966}," else",[1594,2711,1632],{"class":1615},[1594,2713,2714,2717,2719,2721,2723,2725,2727,2729,2732,2734,2736,2738,2740,2742,2744,2746,2749,2751,2755,2757,2759],{"class":1596,"line":2103},[1594,2715,2716],{"class":1611},"        fetch",[1594,2718,1616],{"class":1648},[1594,2720,1651],{"class":1615},[1594,2722,2405],{"class":1654},[1594,2724,1651],{"class":1615},[1594,2726,1623],{"class":1615},[1594,2728,2370],{"class":1615},[1594,2730,2731],{"class":1648}," method",[1594,2733,1756],{"class":1615},[1594,2735,1759],{"class":1615},[1594,2737,2459],{"class":1654},[1594,2739,1651],{"class":1615},[1594,2741,1623],{"class":1615},[1594,2743,2616],{"class":1638},[1594,2745,1623],{"class":1615},[1594,2747,2748],{"class":1648}," keepalive",[1594,2750,1756],{"class":1615},[1594,2752,2754],{"class":2753},"sPKOg"," true",[1594,2756,2385],{"class":1615},[1594,2758,1629],{"class":1648},[1594,2760,1671],{"class":1615},[1594,2762,2763],{"class":1596,"line":2108},[1594,2764,2765],{"class":1615},"    }\n",[1594,2767,2768],{"class":1596,"line":2146},[1594,2769,1677],{"class":1615},[1594,2771,2772],{"class":1596,"line":2165},[1594,2773,1684],{"emptyLinePlaceholder":1683},[1594,2775,2777],{"class":1596,"line":2776},17,[1594,2778,2779],{"class":1600},"// 对外暴露的采集函数\n",[1594,2781,2783,2785,2787,2789,2791,2793,2795,2797,2800],{"class":1596,"line":2782},18,[1594,2784,1608],{"class":1607},[1594,2786,1612],{"class":1611},[1594,2788,1616],{"class":1615},[1594,2790,1620],{"class":1619},[1594,2792,1623],{"class":1615},[1594,2794,1626],{"class":1619},[1594,2796,2239],{"class":1615},[1594,2798,2799],{"class":1615}," {})",[1594,2801,1632],{"class":1615},[1594,2803,2805,2808,2810,2813,2815,2817,2820,2823,2825,2827,2829,2831,2833],{"class":1596,"line":2804},19,[1594,2806,2807],{"class":1611},"    report",[1594,2809,1616],{"class":1648},[1594,2811,2812],{"class":1615},"{",[1594,2814,1662],{"class":1638},[1594,2816,1623],{"class":1615},[1594,2818,2819],{"class":1615}," ...",[1594,2821,2822],{"class":1638},"common",[1594,2824,1623],{"class":1615},[1594,2826,2819],{"class":1615},[1594,2828,2224],{"class":1638},[1594,2830,2385],{"class":1615},[1594,2832,1629],{"class":1648},[1594,2834,1671],{"class":1615},[1594,2836,2838],{"class":1596,"line":2837},20,[1594,2839,1677],{"class":1615},[1594,2841,2843],{"class":1596,"line":2842},21,[1594,2844,1684],{"emptyLinePlaceholder":1683},[1594,2846,2848],{"class":1596,"line":2847},22,[1594,2849,2850],{"class":1600},"// 点击埋点\n",[1594,2852,2854,2856,2858,2860,2862,2864,2866,2868,2870,2872,2874,2876,2878,2880,2882,2884,2886,2888],{"class":1596,"line":2853},23,[1594,2855,7],{"class":1638},[1594,2857,1642],{"class":1615},[1594,2859,1694],{"class":1611},[1594,2861,1616],{"class":1638},[1594,2863,1651],{"class":1615},[1594,2865,1701],{"class":1654},[1594,2867,1651],{"class":1615},[1594,2869,1629],{"class":1638},[1594,2871,1642],{"class":1615},[1594,2873,1710],{"class":1611},[1594,2875,1616],{"class":1638},[1594,2877,1651],{"class":1615},[1594,2879,1717],{"class":1654},[1594,2881,1651],{"class":1615},[1594,2883,1623],{"class":1615},[1594,2885,1724],{"class":1615},[1594,2887,1727],{"class":1607},[1594,2889,1632],{"class":1615},[1594,2891,2893,2895,2897,2899,2901,2903,2905,2907,2910,2912,2914,2916,2918,2920,2922],{"class":1596,"line":2892},24,[1594,2894,1735],{"class":1611},[1594,2896,1616],{"class":1648},[1594,2898,1651],{"class":1615},[1594,2900,1717],{"class":1654},[1594,2902,1651],{"class":1615},[1594,2904,1623],{"class":1615},[1594,2906,2370],{"class":1615},[1594,2908,2909],{"class":1648}," button",[1594,2911,1756],{"class":1615},[1594,2913,1759],{"class":1615},[1594,2915,1762],{"class":1654},[1594,2917,1651],{"class":1615},[1594,2919,2385],{"class":1615},[1594,2921,1629],{"class":1648},[1594,2923,1671],{"class":1615},[1594,2925,2927,2929,2931],{"class":1596,"line":2926},25,[1594,2928,1801],{"class":1615},[1594,2930,1629],{"class":1638},[1594,2932,1671],{"class":1615},[1594,2934,2936],{"class":1596,"line":2935},26,[1594,2937,1684],{"emptyLinePlaceholder":1683},[1594,2939,2941],{"class":1596,"line":2940},27,[1594,2942,2943],{"class":1600},"// 页面离开前，上报停留时长\n",[1594,2945,2947,2949,2952,2954,2956,2958,2960,2962],{"class":1596,"line":2946},28,[1594,2948,1909],{"class":1607},[1594,2950,2951],{"class":1638}," start ",[1594,2953,1864],{"class":1615},[1594,2955,2572],{"class":1638},[1594,2957,1642],{"class":1615},[1594,2959,2577],{"class":1611},[1594,2961,2247],{"class":1638},[1594,2963,1671],{"class":1615},[1594,2965,2967,2970,2972,2974,2976,2978,2981,2983,2985,2987,2989],{"class":1596,"line":2966},29,[1594,2968,2969],{"class":1638},"window",[1594,2971,1642],{"class":1615},[1594,2973,1710],{"class":1611},[1594,2975,1616],{"class":1638},[1594,2977,1651],{"class":1615},[1594,2979,2980],{"class":1654},"pagehide",[1594,2982,1651],{"class":1615},[1594,2984,1623],{"class":1615},[1594,2986,1724],{"class":1615},[1594,2988,1727],{"class":1607},[1594,2990,1632],{"class":1615},[1594,2992,2994,2996,2998,3000,3003,3005,3007,3009,3012,3014,3017,3019,3022,3025,3028,3030,3032,3035,3038,3041,3043,3046,3050,3052,3054,3056],{"class":1596,"line":2993},30,[1594,2995,1735],{"class":1611},[1594,2997,1616],{"class":1648},[1594,2999,1651],{"class":1615},[1594,3001,3002],{"class":1654},"stay",[1594,3004,1651],{"class":1615},[1594,3006,1623],{"class":1615},[1594,3008,2370],{"class":1615},[1594,3010,3011],{"class":1648}," duration",[1594,3013,1756],{"class":1615},[1594,3015,3016],{"class":1638}," Math",[1594,3018,1642],{"class":1615},[1594,3020,3021],{"class":1611},"round",[1594,3023,3024],{"class":1648},"((",[1594,3026,3027],{"class":1638},"Date",[1594,3029,1642],{"class":1615},[1594,3031,2577],{"class":1611},[1594,3033,3034],{"class":1648},"() ",[1594,3036,3037],{"class":1615},"-",[1594,3039,3040],{"class":1638}," start",[1594,3042,1980],{"class":1648},[1594,3044,3045],{"class":1615},"/",[1594,3047,3049],{"class":3048},"smPcV"," 1000",[1594,3051,1980],{"class":1648},[1594,3053,1801],{"class":1615},[1594,3055,1629],{"class":1648},[1594,3057,1671],{"class":1615},[1594,3059,3061,3063,3065],{"class":1596,"line":3060},31,[1594,3062,1801],{"class":1615},[1594,3064,1629],{"class":1638},[1594,3066,1671],{"class":1615},[1531,3068,3069,3070,3073,3074,3076,3077,3080],{},"两个代码里看不出来的细节：降级分支的 ",[1553,3071,3072],{},"keepalive: true"," 让浏览器在页面卸载后也把请求发完；离开页面监听 ",[1553,3075,2980],{}," 而不是 ",[1553,3078,3079],{},"beforeunload","，前者在移动端触发更可靠。",[1558,3082],{},[1526,3084,3086],{"id":3085},"小节总结","🧾 小节总结",[1540,3088,3089,3092,3095,3101,3107],{},[1543,3090,3091],{},"埋点就是在关键位置写记录代码，链路是：采集 → 上报 → 分析。",[1543,3093,3094],{},"手动埋点精确灵活但要手写，无埋点省事但业务语义弱，核心指标用手动埋点。",[1543,3096,3097,3098,3100],{},"曝光埋点用 IntersectionObserver，进入可视区域上报一次，记得 ",[1553,3099,2062],{}," 防重复统计。",[1543,3102,3103,3104,3106],{},"页面卸载时普通异步请求会被取消，",[1553,3105,2191],{}," 由浏览器接管发送、关闭页面也能送达，埋点上报优先用它。",[1543,3108,3109,3110,3112,3113,3115],{},"fetch 加 ",[1553,3111,3072],{}," 是降级补救，离开页面的监听用 ",[1553,3114,2980],{},"。",[1558,3117],{},[1526,3119,3121],{"id":3120},"知识问答","❓ 知识问答",[1531,3123,3124],{},[1535,3125,3126],{},"Q1：图片打点为什么服务端要返回 1x1 像素的图？",[1531,3128,3129],{},"A：打点请求的目的只是让服务端收到参数，响应内容没人看。返回极小的空白图，是为了让请求正常完成、不报错，同时体积尽量小。",[1531,3131,3132],{},[1535,3133,3134,3135,3137],{},"Q2：在 ",[1553,3136,3079],{}," 里用 fetch 上报，为什么数据经常丢？",[1531,3139,3140,3141,3143,3144,3146],{},"A：页面开始卸载后，浏览器会取消还没完成的异步请求。改用 ",[1553,3142,2191],{}," 或 fetch 加 ",[1553,3145,3072],{},"，浏览器才会承诺把请求发完。",[1531,3148,3149],{},[1535,3150,3151,3152,3154],{},"Q3：",[1553,3153,2191],{}," 有数据大小限制吗？",[1531,3156,3157],{},"A：有，常见上限在 64KB 左右。单条埋点数据很小，正常用碰不到；真要上报大段日志，应分批发送或压缩后再发。",[1531,3159,3160],{},[1535,3161,3162],{},"Q4：无埋点能完全替代手动埋点吗？",[1531,3164,3165],{},"A：不能。无埋点收集的是「某个元素被点了」这类原始事件，分不清是「购买商品 A」还是「购买商品 B」，核心业务指标还是建议手动埋点。",[1531,3167,3168],{},[1535,3169,3170],{},"Q5：曝光埋点会不会把「快速划过」的模块也算成曝光？",[1531,3172,3173],{},"A：会，进入可视区域一瞬间就会触发。只认「停留了一段时间」的有效曝光时，可以在回调里延迟几百毫秒再上报，期间元素离开就取消。",[1558,3175],{},[1526,3177,3179],{"id":3178},"小练习","🧪 小练习",[1531,3181,3182,3185],{},[1535,3183,3184],{},"练习一","：给「立即购买」按钮补上点击埋点，要求带上按钮标识和当前页面路径：",[1584,3187,3189],{"className":1586,"code":3188,"language":1589,"meta":1590,"style":1590},"function track(event, data) {\n    console.log('采集到事件：', event, data);\n}\n\ndocument.querySelector('#buy-btn').addEventListener('click', () => {\n    // 请在这里编写代码：上报一次点击事件\n});\n",[1553,3190,3191,3209,3237,3241,3245,3283,3288],{"__ignoreMap":1590},[1594,3192,3193,3195,3197,3199,3201,3203,3205,3207],{"class":1596,"line":1597},[1594,3194,1608],{"class":1607},[1594,3196,1612],{"class":1611},[1594,3198,1616],{"class":1615},[1594,3200,1620],{"class":1619},[1594,3202,1623],{"class":1615},[1594,3204,1626],{"class":1619},[1594,3206,1629],{"class":1615},[1594,3208,1632],{"class":1615},[1594,3210,3211,3213,3215,3217,3219,3221,3223,3225,3227,3229,3231,3233,3235],{"class":1596,"line":1604},[1594,3212,1639],{"class":1638},[1594,3214,1642],{"class":1615},[1594,3216,1645],{"class":1611},[1594,3218,1616],{"class":1648},[1594,3220,1651],{"class":1615},[1594,3222,1655],{"class":1654},[1594,3224,1651],{"class":1615},[1594,3226,1623],{"class":1615},[1594,3228,1662],{"class":1638},[1594,3230,1623],{"class":1615},[1594,3232,1626],{"class":1638},[1594,3234,1629],{"class":1648},[1594,3236,1671],{"class":1615},[1594,3238,3239],{"class":1596,"line":1635},[1594,3240,1677],{"class":1615},[1594,3242,3243],{"class":1596,"line":1674},[1594,3244,1684],{"emptyLinePlaceholder":1683},[1594,3246,3247,3249,3251,3253,3255,3257,3259,3261,3263,3265,3267,3269,3271,3273,3275,3277,3279,3281],{"class":1596,"line":1680},[1594,3248,7],{"class":1638},[1594,3250,1642],{"class":1615},[1594,3252,1694],{"class":1611},[1594,3254,1616],{"class":1638},[1594,3256,1651],{"class":1615},[1594,3258,1701],{"class":1654},[1594,3260,1651],{"class":1615},[1594,3262,1629],{"class":1638},[1594,3264,1642],{"class":1615},[1594,3266,1710],{"class":1611},[1594,3268,1616],{"class":1638},[1594,3270,1651],{"class":1615},[1594,3272,1717],{"class":1654},[1594,3274,1651],{"class":1615},[1594,3276,1623],{"class":1615},[1594,3278,1724],{"class":1615},[1594,3280,1727],{"class":1607},[1594,3282,1632],{"class":1615},[1594,3284,3285],{"class":1596,"line":1687},[1594,3286,3287],{"class":1600},"    // 请在这里编写代码：上报一次点击事件\n",[1594,3289,3290,3292,3294],{"class":1596,"line":1732},[1594,3291,1801],{"class":1615},[1594,3293,1629],{"class":1638},[1594,3295,1671],{"class":1615},[1531,3297,3298,3301,3302,3304],{},[1535,3299,3300],{},"练习二","：下面这个上报函数用的是普通 fetch，页面关闭时数据容易丢，把它改成 ",[1553,3303,2191],{}," 的写法（记得处理旧浏览器的降级）：",[1584,3306,3308],{"className":1586,"code":3307,"language":1589,"meta":1590,"style":1590},"function report(data) {\n    // 请在这里编写代码：优先 sendBeacon，降级 fetch + keepalive\n    fetch('/collect', { method: 'POST', body: JSON.stringify(data) });\n}\n",[1553,3309,3310,3324,3329,3380],{"__ignoreMap":1590},[1594,3311,3312,3314,3316,3318,3320,3322],{"class":1596,"line":1597},[1594,3313,1608],{"class":1607},[1594,3315,2219],{"class":1611},[1594,3317,1616],{"class":1615},[1594,3319,2224],{"class":1619},[1594,3321,1629],{"class":1615},[1594,3323,1632],{"class":1615},[1594,3325,3326],{"class":1596,"line":1604},[1594,3327,3328],{"class":1600},"    // 请在这里编写代码：优先 sendBeacon，降级 fetch + keepalive\n",[1594,3330,3331,3334,3336,3338,3340,3342,3344,3346,3348,3350,3352,3354,3356,3358,3360,3362,3364,3366,3368,3370,3372,3374,3376,3378],{"class":1596,"line":1635},[1594,3332,3333],{"class":1611},"    fetch",[1594,3335,1616],{"class":1648},[1594,3337,1651],{"class":1615},[1594,3339,2405],{"class":1654},[1594,3341,1651],{"class":1615},[1594,3343,1623],{"class":1615},[1594,3345,2370],{"class":1615},[1594,3347,2731],{"class":1648},[1594,3349,1756],{"class":1615},[1594,3351,1759],{"class":1615},[1594,3353,2459],{"class":1654},[1594,3355,1651],{"class":1615},[1594,3357,1623],{"class":1615},[1594,3359,2616],{"class":1648},[1594,3361,1756],{"class":1615},[1594,3363,2621],{"class":1638},[1594,3365,1642],{"class":1615},[1594,3367,2288],{"class":1611},[1594,3369,1616],{"class":1648},[1594,3371,2224],{"class":1638},[1594,3373,1980],{"class":1648},[1594,3375,1801],{"class":1615},[1594,3377,1629],{"class":1648},[1594,3379,1671],{"class":1615},[1594,3381,3382],{"class":1596,"line":1674},[1594,3383,1677],{"class":1615},[1531,3385,3386,3387,3389,3390,3393,3394,3396],{},"完成后想想：为什么 ",[1553,3388,2191],{}," 分支里要包一层 ",[1553,3391,3392],{},"Blob"," 并声明 ",[1553,3395,2380],{}," 类型？直接传字符串时，服务端读到的 Content-Type 会是什么？",[1558,3398],{},[1531,3400,3401],{},"🎉 恭喜你已经掌握埋点与数据上报技能啦！下一篇我们把目光转向「页面跑得有多快」，看看性能数据是怎么采集和上报的。",[3403,3404,3405],"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 .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}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 .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 .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 .sPKOg, html code.shiki .sPKOg{--shiki-light:#FF5370;--shiki-default:#FF9CAC;--shiki-dark:#FF9CAC}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":1590,"searchDepth":1604,"depth":1604,"links":3407},[3408,3409,3410,3411,3412,3413,3414,3415],{"id":1528,"depth":1604,"text":1529},{"id":1562,"depth":1604,"text":1563},{"id":1825,"depth":1604,"text":1826},{"id":2182,"depth":1604,"text":2183},{"id":2525,"depth":1604,"text":2526},{"id":3085,"depth":1604,"text":3086},{"id":3120,"depth":1604,"text":3121},{"id":3178,"depth":1604,"text":3179},"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。","md",null,{},{"title":1504},{"title":1521,"description":3416},"QsDjW7xjAy",[3424,3426],{"title":1500,"path":1501,"stem":1502,"description":3425,"children":-1},"掌握 JS 运行时错误、Promise 异常与资源加载错误的采集方法，让线上报错无处可藏。",{"title":1508,"path":1509,"stem":1510,"description":3427,"children":-1},"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。",1784715112222]