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常用方法进阶",[1580,1825,1828],{"className":1582,"code":1826,"filename":1827,"language":1585,"meta":1586,"style":1586},"import { EventEmitter } from 'node:events';\n\nconst emitter = new EventEmitter();\n\n// once：只响应一次，触发后自动移除\nemitter.once('start', () => {\n    console.log('程序启动了');\n});\n\nemitter.emit('start'); // 输出：程序启动了\nemitter.emit('start'); // 没有输出\n\n// off：手动移除指定的监听器\nfunction onLogin(name) {\n    console.log(`${name} 登录了`);\n}\n\nemitter.on('login', onLogin);\nemitter.off('login', onLogin); // 退订\nemitter.emit('login', '小明'); // 没有输出\n\n// eventNames：查看当前订阅了哪些事件\nconsole.log(emitter.eventNames()); // []\n","methods.js",[1553,1829,1830,1850,1854,1870,1874,1879,1906,1927,1935,1939,1962,1985,1990,1996,2013,2040,2046,2051,2075,2101,2132,2137,2143],{"__ignoreMap":1586},[1590,1831,1832,1834,1836,1838,1840,1842,1844,1846,1848],{"class":1592,"line":1593},[1590,1833,1597],{"class":1596},[1590,1835,1601],{"class":1600},[1590,1837,1605],{"class":1604},[1590,1839,1608],{"class":1600},[1590,1841,1611],{"class":1596},[1590,1843,1614],{"class":1600},[1590,1845,1618],{"class":1617},[1590,1847,1621],{"class":1600},[1590,1849,1624],{"class":1600},[1590,1851,1852],{"class":1592,"line":1627},[1590,1853,1631],{"emptyLinePlaceholder":1630},[1590,1855,1856,1858,1860,1862,1864,1866,1868],{"class":1592,"line":1634},[1590,1857,1638],{"class":1637},[1590,1859,1641],{"class":1604},[1590,1861,1644],{"class":1600},[1590,1863,1647],{"class":1600},[1590,1865,1605],{"class":1650},[1590,1867,1653],{"class":1604},[1590,1869,1624],{"class":1600},[1590,1871,1872],{"class":1592,"line":1658},[1590,1873,1631],{"emptyLinePlaceholder":1630},[1590,1875,1876],{"class":1592,"line":1663},[1590,1877,1878],{"class":1666},"// once：只响应一次，触发后自动移除\n",[1590,1880,1881,1883,1885,1888,1890,1892,1895,1897,1899,1902,1904],{"class":1592,"line":1670},[1590,1882,1673],{"class":1604},[1590,1884,1676],{"class":1600},[1590,1886,1887],{"class":1650},"once",[1590,1889,1681],{"class":1604},[1590,1891,1621],{"class":1600},[1590,1893,1894],{"class":1617},"start",[1590,1896,1621],{"class":1600},[1590,1898,1691],{"class":1600},[1590,1900,1901],{"class":1600}," ()",[1590,1903,1704],{"class":1637},[1590,1905,1707],{"class":1600},[1590,1907,1908,1910,1912,1914,1916,1918,1921,1923,1925],{"class":1592,"line":1710},[1590,1909,1713],{"class":1604},[1590,1911,1676],{"class":1600},[1590,1913,1718],{"class":1650},[1590,1915,1681],{"class":1721},[1590,1917,1621],{"class":1600},[1590,1919,1920],{"class":1617},"程序启动了",[1590,1922,1621],{"class":1600},[1590,1924,1701],{"class":1721},[1590,1926,1624],{"class":1600},[1590,1928,1929,1931,1933],{"class":1592,"line":1742},[1590,1930,1745],{"class":1600},[1590,1932,1701],{"class":1604},[1590,1934,1624],{"class":1600},[1590,1936,1937],{"class":1592,"line":1752},[1590,1938,1631],{"emptyLinePlaceholder":1630},[1590,1940,1941,1943,1945,1947,1949,1951,1953,1955,1957,1959],{"class":1592,"line":1757},[1590,1942,1673],{"class":1604},[1590,1944,1676],{"class":1600},[1590,1946,1567],{"class":1650},[1590,1948,1681],{"class":1604},[1590,1950,1621],{"class":1600},[1590,1952,1894],{"class":1617},[1590,1954,1621],{"class":1600},[1590,1956,1701],{"class":1604},[1590,1958,1791],{"class":1600},[1590,1960,1961],{"class":1666}," // 输出：程序启动了\n",[1590,1963,1964,1966,1968,1970,1972,1974,1976,1978,1980,1982],{"class":1592,"line":1763},[1590,1965,1673],{"class":1604},[1590,1967,1676],{"class":1600},[1590,1969,1567],{"class":1650},[1590,1971,1681],{"class":1604},[1590,1973,1621],{"class":1600},[1590,1975,1894],{"class":1617},[1590,1977,1621],{"class":1600},[1590,1979,1701],{"class":1604},[1590,1981,1791],{"class":1600},[1590,1983,1984],{"class":1666}," // 没有输出\n",[1590,1986,1988],{"class":1592,"line":1987},12,[1590,1989,1631],{"emptyLinePlaceholder":1630},[1590,1991,1993],{"class":1592,"line":1992},13,[1590,1994,1995],{"class":1666},"// off：手动移除指定的监听器\n",[1590,1997,1999,2002,2005,2007,2009,2011],{"class":1592,"line":1998},14,[1590,2000,2001],{"class":1637},"function",[1590,2003,2004],{"class":1650}," onLogin",[1590,2006,1681],{"class":1600},[1590,2008,1698],{"class":1697},[1590,2010,1701],{"class":1600},[1590,2012,1707],{"class":1600},[1590,2014,2016,2018,2020,2022,2024,2027,2029,2031,2034,2036,2038],{"class":1592,"line":2015},15,[1590,2017,1713],{"class":1604},[1590,2019,1676],{"class":1600},[1590,2021,1718],{"class":1650},[1590,2023,1681],{"class":1721},[1590,2025,2026],{"class":1600},"`${",[1590,2028,1698],{"class":1604},[1590,2030,1745],{"class":1600},[1590,2032,2033],{"class":1617}," 登录了",[1590,2035,1724],{"class":1600},[1590,2037,1701],{"class":1721},[1590,2039,1624],{"class":1600},[1590,2041,2043],{"class":1592,"line":2042},16,[1590,2044,2045],{"class":1600},"}\n",[1590,2047,2049],{"class":1592,"line":2048},17,[1590,2050,1631],{"emptyLinePlaceholder":1630},[1590,2052,2054,2056,2058,2060,2062,2064,2066,2068,2070,2073],{"class":1592,"line":2053},18,[1590,2055,1673],{"class":1604},[1590,2057,1676],{"class":1600},[1590,2059,1563],{"class":1650},[1590,2061,1681],{"class":1604},[1590,2063,1621],{"class":1600},[1590,2065,1686],{"class":1617},[1590,2067,1621],{"class":1600},[1590,2069,1691],{"class":1600},[1590,2071,2072],{"class":1604}," onLogin)",[1590,2074,1624],{"class":1600},[1590,2076,2078,2080,2082,2084,2086,2088,2090,2092,2094,2096,2098],{"class":1592,"line":2077},19,[1590,2079,1673],{"class":1604},[1590,2081,1676],{"class":1600},[1590,2083,1571],{"class":1650},[1590,2085,1681],{"class":1604},[1590,2087,1621],{"class":1600},[1590,2089,1686],{"class":1617},[1590,2091,1621],{"class":1600},[1590,2093,1691],{"class":1600},[1590,2095,2072],{"class":1604},[1590,2097,1791],{"class":1600},[1590,2099,2100],{"class":1666}," // 退订\n",[1590,2102,2104,2106,2108,2110,2112,2114,2116,2118,2120,2122,2124,2126,2128,2130],{"class":1592,"line":2103},20,[1590,2105,1673],{"class":1604},[1590,2107,1676],{"class":1600},[1590,2109,1567],{"class":1650},[1590,2111,1681],{"class":1604},[1590,2113,1621],{"class":1600},[1590,2115,1686],{"class":1617},[1590,2117,1621],{"class":1600},[1590,2119,1691],{"class":1600},[1590,2121,1614],{"class":1600},[1590,2123,1784],{"class":1617},[1590,2125,1621],{"class":1600},[1590,2127,1701],{"class":1604},[1590,2129,1791],{"class":1600},[1590,2131,1984],{"class":1666},[1590,2133,2135],{"class":1592,"line":2134},21,[1590,2136,1631],{"emptyLinePlaceholder":1630},[1590,2138,2140],{"class":1592,"line":2139},22,[1590,2141,2142],{"class":1666},"// eventNames：查看当前订阅了哪些事件\n",[1590,2144,2146,2149,2151,2153,2156,2158,2161,2164,2166],{"class":1592,"line":2145},23,[1590,2147,2148],{"class":1604},"console",[1590,2150,1676],{"class":1600},[1590,2152,1718],{"class":1650},[1590,2154,2155],{"class":1604},"(emitter",[1590,2157,1676],{"class":1600},[1590,2159,2160],{"class":1650},"eventNames",[1590,2162,2163],{"class":1604},"())",[1590,2165,1791],{"class":1600},[1590,2167,2168],{"class":1666}," // []\n",[2170,2171,2172],"tip",{},[1531,2173,2174,2176,2177,2179],{},[1553,2175,1571],{}," 移除监听器时，传入的必须是同一个函数引用。如果 ",[1553,2178,1563],{}," 的时候写的是匿名箭头函数，之后是没办法单独移除它的，需要移除的场景请把函数先存成变量。",[1535,2181],{},[1526,2183,2185],{"id":2184},"这些细节要注意","🪤 这些细节要注意",[1531,2187,2188,2191],{},[1545,2189,2190],{},"同一个事件可以挂多个监听器","，触发时按订阅顺序依次执行：",[1580,2193,2196],{"className":1582,"code":2194,"filename":2195,"language":1585,"meta":1586,"style":1586},"emitter.on('login', () => console.log('记录日志'));\nemitter.on('login', () => console.log('发送通知'));\n\nemitter.emit('login');\n// 记录日志\n// 发送通知\n","multi.js",[1553,2197,2198,2241,2282,2286,2306,2311],{"__ignoreMap":1586},[1590,2199,2200,2202,2204,2206,2208,2210,2212,2214,2216,2218,2220,2223,2225,2227,2229,2231,2234,2236,2239],{"class":1592,"line":1593},[1590,2201,1673],{"class":1604},[1590,2203,1676],{"class":1600},[1590,2205,1563],{"class":1650},[1590,2207,1681],{"class":1604},[1590,2209,1621],{"class":1600},[1590,2211,1686],{"class":1617},[1590,2213,1621],{"class":1600},[1590,2215,1691],{"class":1600},[1590,2217,1901],{"class":1600},[1590,2219,1704],{"class":1637},[1590,2221,2222],{"class":1604}," console",[1590,2224,1676],{"class":1600},[1590,2226,1718],{"class":1650},[1590,2228,1681],{"class":1604},[1590,2230,1621],{"class":1600},[1590,2232,2233],{"class":1617},"记录日志",[1590,2235,1621],{"class":1600},[1590,2237,2238],{"class":1604},"))",[1590,2240,1624],{"class":1600},[1590,2242,2243,2245,2247,2249,2251,2253,2255,2257,2259,2261,2263,2265,2267,2269,2271,2273,2276,2278,2280],{"class":1592,"line":1627},[1590,2244,1673],{"class":1604},[1590,2246,1676],{"class":1600},[1590,2248,1563],{"class":1650},[1590,2250,1681],{"class":1604},[1590,2252,1621],{"class":1600},[1590,2254,1686],{"class":1617},[1590,2256,1621],{"class":1600},[1590,2258,1691],{"class":1600},[1590,2260,1901],{"class":1600},[1590,2262,1704],{"class":1637},[1590,2264,2222],{"class":1604},[1590,2266,1676],{"class":1600},[1590,2268,1718],{"class":1650},[1590,2270,1681],{"class":1604},[1590,2272,1621],{"class":1600},[1590,2274,2275],{"class":1617},"发送通知",[1590,2277,1621],{"class":1600},[1590,2279,2238],{"class":1604},[1590,2281,1624],{"class":1600},[1590,2283,2284],{"class":1592,"line":1634},[1590,2285,1631],{"emptyLinePlaceholder":1630},[1590,2287,2288,2290,2292,2294,2296,2298,2300,2302,2304],{"class":1592,"line":1658},[1590,2289,1673],{"class":1604},[1590,2291,1676],{"class":1600},[1590,2293,1567],{"class":1650},[1590,2295,1681],{"class":1604},[1590,2297,1621],{"class":1600},[1590,2299,1686],{"class":1617},[1590,2301,1621],{"class":1600},[1590,2303,1701],{"class":1604},[1590,2305,1624],{"class":1600},[1590,2307,2308],{"class":1592,"line":1663},[1590,2309,2310],{"class":1666},"// 记录日志\n",[1590,2312,2313],{"class":1592,"line":1670},[1590,2314,2315],{"class":1666},"// 发送通知\n",[1531,2317,2318,2323],{},[1545,2319,2320,2322],{},[1553,2321,1567],{}," 是同步执行的","，触发的那一刻，所有监听器立即按顺序跑完，并不会排队等下一轮事件循环。",[2325,2326,2327],"warning",{},[1531,2328,2329,2330,2332,2333,2335],{},"不再使用的监听器要记得移除。反复 ",[1553,2331,1563],{}," 却不 ",[1553,2334,1571],{},"，监听器会越积越多造成内存泄漏。Node.js 默认同一个事件超过 10 个监听器就会在终端打印警告，这是在提醒你检查代码。",[1535,2337],{},[1526,2339,2341],{"id":2340},"实战写一个解耦的日志器","💡 实战：写一个解耦的日志器",[1531,2343,2344,2345,2348],{},"发布订阅的价值在于",[1545,2346,2347],{},"解耦","：发消息的人不用关心谁在听、怎么处理。用一个日志器体会一下：",[1580,2350,2353],{"className":1582,"code":2351,"filename":2352,"language":1585,"meta":1586,"style":1586},"import { EventEmitter } from 'node:events';\n\nexport const logger = new EventEmitter();\n\n// 日志器自己决定怎么处理 log 事件\nlogger.on('log', (message) => {\n    const time = new Date().toLocaleTimeString();\n    console.log(`[${time}] ${message}`);\n});\n","logger.js",[1553,2354,2355,2375,2379,2400,2404,2409,2439,2466,2501],{"__ignoreMap":1586},[1590,2356,2357,2359,2361,2363,2365,2367,2369,2371,2373],{"class":1592,"line":1593},[1590,2358,1597],{"class":1596},[1590,2360,1601],{"class":1600},[1590,2362,1605],{"class":1604},[1590,2364,1608],{"class":1600},[1590,2366,1611],{"class":1596},[1590,2368,1614],{"class":1600},[1590,2370,1618],{"class":1617},[1590,2372,1621],{"class":1600},[1590,2374,1624],{"class":1600},[1590,2376,2377],{"class":1592,"line":1627},[1590,2378,1631],{"emptyLinePlaceholder":1630},[1590,2380,2381,2384,2387,2390,2392,2394,2396,2398],{"class":1592,"line":1634},[1590,2382,2383],{"class":1596},"export",[1590,2385,2386],{"class":1637}," const",[1590,2388,2389],{"class":1604}," logger ",[1590,2391,1644],{"class":1600},[1590,2393,1647],{"class":1600},[1590,2395,1605],{"class":1650},[1590,2397,1653],{"class":1604},[1590,2399,1624],{"class":1600},[1590,2401,2402],{"class":1592,"line":1658},[1590,2403,1631],{"emptyLinePlaceholder":1630},[1590,2405,2406],{"class":1592,"line":1663},[1590,2407,2408],{"class":1666},"// 日志器自己决定怎么处理 log 事件\n",[1590,2410,2411,2414,2416,2418,2420,2422,2424,2426,2428,2430,2433,2435,2437],{"class":1592,"line":1670},[1590,2412,2413],{"class":1604},"logger",[1590,2415,1676],{"class":1600},[1590,2417,1563],{"class":1650},[1590,2419,1681],{"class":1604},[1590,2421,1621],{"class":1600},[1590,2423,1718],{"class":1617},[1590,2425,1621],{"class":1600},[1590,2427,1691],{"class":1600},[1590,2429,1694],{"class":1600},[1590,2431,2432],{"class":1697},"message",[1590,2434,1701],{"class":1600},[1590,2436,1704],{"class":1637},[1590,2438,1707],{"class":1600},[1590,2440,2441,2444,2447,2450,2452,2455,2457,2459,2462,2464],{"class":1592,"line":1710},[1590,2442,2443],{"class":1637},"    const",[1590,2445,2446],{"class":1604}," time",[1590,2448,2449],{"class":1600}," =",[1590,2451,1647],{"class":1600},[1590,2453,2454],{"class":1650}," Date",[1590,2456,1653],{"class":1721},[1590,2458,1676],{"class":1600},[1590,2460,2461],{"class":1650},"toLocaleTimeString",[1590,2463,1653],{"class":1721},[1590,2465,1624],{"class":1600},[1590,2467,2468,2470,2472,2474,2476,2478,2481,2483,2486,2488,2491,2493,2495,2497,2499],{"class":1592,"line":1742},[1590,2469,1713],{"class":1604},[1590,2471,1676],{"class":1600},[1590,2473,1718],{"class":1650},[1590,2475,1681],{"class":1721},[1590,2477,1724],{"class":1600},[1590,2479,2480],{"class":1617},"[",[1590,2482,1730],{"class":1600},[1590,2484,2485],{"class":1604},"time",[1590,2487,1745],{"class":1600},[1590,2489,2490],{"class":1617},"] ",[1590,2492,1730],{"class":1600},[1590,2494,2432],{"class":1604},[1590,2496,1735],{"class":1600},[1590,2498,1701],{"class":1721},[1590,2500,1624],{"class":1600},[1590,2502,2503,2505,2507],{"class":1592,"line":1752},[1590,2504,1745],{"class":1600},[1590,2506,1701],{"class":1604},[1590,2508,1624],{"class":1600},[1580,2510,2513],{"className":1582,"code":2511,"filename":2512,"language":1585,"meta":1586,"style":1586},"import { logger } from './logger.js';\n\n// 业务代码只管发事件，不关心日志怎么打印\nlogger.emit('log', '用户小明登录了');\nlogger.emit('log', '用户小明退出了');\n","app.js",[1553,2514,2515,2537,2541,2546,2575],{"__ignoreMap":1586},[1590,2516,2517,2519,2521,2524,2526,2528,2530,2533,2535],{"class":1592,"line":1593},[1590,2518,1597],{"class":1596},[1590,2520,1601],{"class":1600},[1590,2522,2523],{"class":1604}," logger",[1590,2525,1608],{"class":1600},[1590,2527,1611],{"class":1596},[1590,2529,1614],{"class":1600},[1590,2531,2532],{"class":1617},"./logger.js",[1590,2534,1621],{"class":1600},[1590,2536,1624],{"class":1600},[1590,2538,2539],{"class":1592,"line":1627},[1590,2540,1631],{"emptyLinePlaceholder":1630},[1590,2542,2543],{"class":1592,"line":1634},[1590,2544,2545],{"class":1666},"// 业务代码只管发事件，不关心日志怎么打印\n",[1590,2547,2548,2550,2552,2554,2556,2558,2560,2562,2564,2566,2569,2571,2573],{"class":1592,"line":1658},[1590,2549,2413],{"class":1604},[1590,2551,1676],{"class":1600},[1590,2553,1567],{"class":1650},[1590,2555,1681],{"class":1604},[1590,2557,1621],{"class":1600},[1590,2559,1718],{"class":1617},[1590,2561,1621],{"class":1600},[1590,2563,1691],{"class":1600},[1590,2565,1614],{"class":1600},[1590,2567,2568],{"class":1617},"用户小明登录了",[1590,2570,1621],{"class":1600},[1590,2572,1701],{"class":1604},[1590,2574,1624],{"class":1600},[1590,2576,2577,2579,2581,2583,2585,2587,2589,2591,2593,2595,2598,2600,2602],{"class":1592,"line":1663},[1590,2578,2413],{"class":1604},[1590,2580,1676],{"class":1600},[1590,2582,1567],{"class":1650},[1590,2584,1681],{"class":1604},[1590,2586,1621],{"class":1600},[1590,2588,1718],{"class":1617},[1590,2590,1621],{"class":1600},[1590,2592,1691],{"class":1600},[1590,2594,1614],{"class":1600},[1590,2596,2597],{"class":1617},"用户小明退出了",[1590,2599,1621],{"class":1600},[1590,2601,1701],{"class":1604},[1590,2603,1624],{"class":1600},[1531,2605,2606,2607,2609],{},"以后想把日志改成写入文件，只需要改 ",[1553,2608,2352],{}," 一处，所有业务代码都不用动。Node.js 的很多核心模块（http 的 server、文件流等）都建立在 EventEmitter 之上，理解了它，后面学 Express 会轻松很多。",[1535,2611],{},[1526,2613,2615],{"id":2614},"小节总结","🧾 小节总结",[2617,2618,2619,2623,2635,2643,2649],"ul",{},[2620,2621,2622],"li",{},"EventEmitter 是 Node.js 事件驱动的核心：订阅事件，有事发生再处理。",[2620,2624,2625,2626,2628,2629,2631,2632,2634],{},"基本三件套：",[1553,2627,1563],{}," 监听、",[1553,2630,1567],{}," 触发并传参、",[1553,2633,1571],{}," 移除。",[2620,2636,2637,2639,2640,2642],{},[1553,2638,1887],{}," 只响应一次，",[1553,2641,2160],{}," 查看当前订阅的事件。",[2620,2644,2645,2646,2648],{},"同一事件的多个监听器按顺序同步执行，",[1553,2647,1567],{}," 本身不是异步的。",[2620,2650,2651],{},"发布订阅让模块之间解耦，日志、通知等横向功能非常适合用它实现。",[1535,2653],{},[1526,2655,2657],{"id":2656},"知识问答","❓ 知识问答",[1531,2659,2660],{},[1545,2661,2662],{},"Q1：on 和 addListener 有区别吗？",[1531,2664,2665,2666,2668],{},"没有，两者是同一个方法的两个名字，用哪个都可以，社区里 ",[1553,2667,1563],{}," 更常见。",[1531,2670,2671],{},[1545,2672,2673],{},"Q2：emit 是同步还是异步？",[1531,2675,2676,2677,2679,2680,2682],{},"同步。",[1553,2678,1567],{}," 调用时，所有监听器会立即按顺序执行完，然后才继续执行 ",[1553,2681,1567],{}," 后面的代码。",[1531,2684,2685],{},[1545,2686,2687],{},"Q3：once 触发之后还需要手动 off 吗？",[1531,2689,2690,2691,2693],{},"不需要。",[1553,2692,1887],{}," 注册的监听器在触发后会自动移除。",[1531,2695,2696],{},[1545,2697,2698],{},"Q4：EventEmitter 和浏览器的事件是一回事吗？",[1531,2700,2701],{},"思想相同，实现是两套。浏览器事件由 DOM 提供，EventEmitter 是 Node.js 自己的实现，用法相近但 API 不完全一样，不要混用概念。",[1535,2703],{},[1526,2705,2707],{"id":2706},"小练习","🧪 小练习",[1531,2709,2710,2711,2714,2715,2717,2718,2721,2722,2724,2725,1817],{},"模拟一个简单的下单流程：创建 ",[1553,2712,2713],{},"order.js","，订阅 ",[1553,2716,1813],{}," 事件并打印“收到订单：xxx”，订阅 ",[1553,2719,2720],{},"pay"," 事件并只响应一次，打印“支付成功”。然后依次触发一次 ",[1553,2723,1813],{},"（参数：奶茶）、两次 ",[1553,2726,2720],{},[1580,2728,2730],{"className":1582,"code":2729,"filename":2713,"language":1585,"meta":1586,"style":1586},"import { EventEmitter } from 'node:events';\n\nconst emitter = new EventEmitter();\n\n// 请在这里编写代码\n",[1553,2731,2732,2752,2756,2772,2776],{"__ignoreMap":1586},[1590,2733,2734,2736,2738,2740,2742,2744,2746,2748,2750],{"class":1592,"line":1593},[1590,2735,1597],{"class":1596},[1590,2737,1601],{"class":1600},[1590,2739,1605],{"class":1604},[1590,2741,1608],{"class":1600},[1590,2743,1611],{"class":1596},[1590,2745,1614],{"class":1600},[1590,2747,1618],{"class":1617},[1590,2749,1621],{"class":1600},[1590,2751,1624],{"class":1600},[1590,2753,2754],{"class":1592,"line":1627},[1590,2755,1631],{"emptyLinePlaceholder":1630},[1590,2757,2758,2760,2762,2764,2766,2768,2770],{"class":1592,"line":1634},[1590,2759,1638],{"class":1637},[1590,2761,1641],{"class":1604},[1590,2763,1644],{"class":1600},[1590,2765,1647],{"class":1600},[1590,2767,1605],{"class":1650},[1590,2769,1653],{"class":1604},[1590,2771,1624],{"class":1600},[1590,2773,2774],{"class":1592,"line":1658},[1590,2775,1631],{"emptyLinePlaceholder":1630},[1590,2777,2778],{"class":1592,"line":1663},[1590,2779,2780],{"class":1666},"// 请在这里编写代码\n",[1535,2782],{},[1531,2784,2785],{},"🎉 恭喜你已经完成 Node.js 入门课程！现在你已经掌握 Node.js 的核心概念，以及 fs、path、http、events 等常用内置模块。接下来可以学习 Express 框架，用更高效的方式搭建完整的后端服务。",[2787,2788,2789],"style",{},"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 .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}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 .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html 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