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先懂客户端与服务器",[1531,1542,1543,1544,1548,1549,1552],{},"Web 的世界里有两种角色：",[1545,1546,1547],"strong",{},"客户端","（比如浏览器）负责发请求，",[1545,1550,1551],{},"服务器","负责接收请求并返回响应。",[1531,1554,1555],{},"就像去餐厅点餐：你告诉服务员要吃什么，这是“请求”；厨房做好后端上来，这是“响应”。浏览器访问一个网址，背后就是这一套流程。Node.js 可以让我们的电脑扮演服务器的角色。",[1535,1557],{},[1526,1559,1561],{"id":1560},"第一个服务器","🛠 第一个服务器",[1531,1563,1564,1565,1569],{},"创建 ",[1566,1567,1568],"code",{},"server.js","，写入下面的代码：",[1571,1572,1577],"pre",{"className":1573,"code":1574,"filename":1568,"language":1575,"meta":1576,"style":1576},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import http from 'node:http';\n\n// 创建服务器：每次有请求进来，这个回调函数就会执行\nconst server = http.createServer((req, res) => {\n    res.end('Hello Node.js Server');\n});\n\n// 监听 3000 端口，启动服务\nserver.listen(3000, () => {\n    console.log('服务器已启动：http://localhost:3000');\n});\n","js","",[1566,1578,1579,1609,1616,1623,1670,1695,1705,1710,1716,1742,1766],{"__ignoreMap":1576},[1580,1581,1584,1588,1592,1595,1599,1603,1606],"span",{"class":1582,"line":1583},"line",1,[1580,1585,1587],{"class":1586},"s8pZq","import",[1580,1589,1591],{"class":1590},"sndM8"," http ",[1580,1593,1594],{"class":1586},"from",[1580,1596,1598],{"class":1597},"s86vT"," '",[1580,1600,1602],{"class":1601},"sIEYB","node:http",[1580,1604,1605],{"class":1597},"'",[1580,1607,1608],{"class":1597},";\n",[1580,1610,1612],{"class":1582,"line":1611},2,[1580,1613,1615],{"emptyLinePlaceholder":1614},true,"\n",[1580,1617,1619],{"class":1582,"line":1618},3,[1580,1620,1622],{"class":1621},"syuKq","// 创建服务器：每次有请求进来，这个回调函数就会执行\n",[1580,1624,1626,1630,1633,1636,1639,1642,1646,1649,1651,1655,1658,1661,1664,1667],{"class":1582,"line":1625},4,[1580,1627,1629],{"class":1628},"s50WR","const",[1580,1631,1632],{"class":1590}," server 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console",[1580,1749,1641],{"class":1597},[1580,1751,1752],{"class":1644},"log",[1580,1754,1648],{"class":1683},[1580,1756,1605],{"class":1597},[1580,1758,1759],{"class":1601},"服务器已启动：http://localhost:3000",[1580,1761,1605],{"class":1597},[1580,1763,1663],{"class":1683},[1580,1765,1608],{"class":1597},[1580,1767,1769,1771,1773],{"class":1582,"line":1768},11,[1580,1770,1700],{"class":1597},[1580,1772,1663],{"class":1590},[1580,1774,1608],{"class":1597},[1531,1776,1777],{},"逐行理解：",[1779,1780,1781,1794,1804],"ul",{},[1782,1783,1784,1786,1787,1789,1790,1793],"li",{},[1566,1785,1645],{}," 创建一个服务器实例，回调里的 ",[1566,1788,1654],{}," 是请求对象（客户端发来的信息），",[1566,1791,1792],{},"res"," 是响应对象（我们回给客户端的内容）。",[1782,1795,1796,1799,1800,1803],{},[1566,1797,1798],{},"res.end()"," 结束响应并把内容发给客户端，",[1545,1801,1802],{},"每个请求都必须调用它","，否则浏览器会一直转圈等待。",[1782,1805,1806,1809],{},[1566,1807,1808],{},"listen(3000)"," 让服务器监听 3000 端口，端口可以理解为这台电脑上的“服务窗口编号”。",[1531,1811,1812,1813,1816,1817,1820],{},"运行 ",[1566,1814,1815],{},"node server.js","，浏览器打开 ",[1566,1818,1819],{},"http://localhost:3000","，就能看到返回的文字了。",[1535,1822],{},[1526,1824,1826],{"id":1825},"中文乱码问题","🪤 中文乱码问题",[1531,1828,1829,1830,1833],{},"把上面的返回内容改成中文试试：",[1566,1831,1832],{},"res.end('你好，世界')","。浏览器很可能显示一堆乱码。",[1531,1835,1836,1837,1840],{},"原因是浏览器不知道我们发的是什么编码。用 ",[1566,1838,1839],{},"setHeader"," 明确告诉它：",[1571,1842,1844],{"className":1573,"code":1843,"filename":1568,"language":1575,"meta":1576,"style":1576},"const server = http.createServer((req, res) => {\n    res.setHeader('Content-Type', 'text/plain; charset=utf-8');\n    res.end('你好，世界');\n});\n",[1566,1845,1846,1876,1906,1927],{"__ignoreMap":1576},[1580,1847,1848,1850,1852,1854,1856,1858,1860,1862,1864,1866,1868,1870,1872,1874],{"class":1582,"line":1583},[1580,1849,1629],{"class":1628},[1580,1851,1632],{"class":1590},[1580,1853,1635],{"class":1597},[1580,1855,1638],{"class":1590},[1580,1857,1641],{"class":1597},[1580,1859,1645],{"class":1644},[1580,1861,1648],{"class":1590},[1580,1863,1648],{"class":1597},[1580,1865,1654],{"class":1653},[1580,1867,1657],{"class":1597},[1580,1869,1660],{"class":1653},[1580,1871,1663],{"class":1597},[1580,1873,1666],{"class":1628},[1580,1875,1669],{"class":1597},[1580,1877,1878,1880,1882,1884,1886,1888,1891,1893,1895,1897,1900,1902,1904],{"class":1582,"line":1611},[1580,1879,1675],{"class":1590},[1580,1881,1641],{"class":1597},[1580,1883,1839],{"class":1644},[1580,1885,1648],{"class":1683},[1580,1887,1605],{"class":1597},[1580,1889,1890],{"class":1601},"Content-Type",[1580,1892,1605],{"class":1597},[1580,1894,1657],{"class":1597},[1580,1896,1598],{"class":1597},[1580,1898,1899],{"class":1601},"text/plain; charset=utf-8",[1580,1901,1605],{"class":1597},[1580,1903,1663],{"class":1683},[1580,1905,1608],{"class":1597},[1580,1907,1908,1910,1912,1914,1916,1918,1921,1923,1925],{"class":1582,"line":1618},[1580,1909,1675],{"class":1590},[1580,1911,1641],{"class":1597},[1580,1913,1680],{"class":1644},[1580,1915,1648],{"class":1683},[1580,1917,1605],{"class":1597},[1580,1919,1920],{"class":1601},"你好，世界",[1580,1922,1605],{"class":1597},[1580,1924,1663],{"class":1683},[1580,1926,1608],{"class":1597},[1580,1928,1929,1931,1933],{"class":1582,"line":1625},[1580,1930,1700],{"class":1597},[1580,1932,1663],{"class":1590},[1580,1934,1608],{"class":1597},[1936,1937,1938],"warning",{},[1531,1939,1940,1941,1944,1945,1947,1948,1950],{},"返回中文却不设置 ",[1566,1942,1943],{},"charset=utf-8"," 是初学者的高频踩坑点。记住：",[1566,1946,1890],{}," 告诉浏览器“内容的类型和编码”，设置要在 ",[1566,1949,1798],{}," 之前。",[1535,1952],{},[1526,1954,1956],{"id":1955},"简单路由","🛠 简单路由",[1531,1958,1959,1960,1962,1963,1966,1967,1970],{},"真实的服务器要根据访问地址返回不同内容，这就是",[1545,1961,1162],{},"。用 ",[1566,1964,1965],{},"req.url"," 和 ",[1566,1968,1969],{},"req.method"," 判断即可：",[1571,1972,1974],{"className":1573,"code":1973,"filename":1568,"language":1575,"meta":1576,"style":1576},"import http from 'node:http';\n\nconst server = http.createServer((req, res) => {\n    res.setHeader('Content-Type', 'text/plain; charset=utf-8');\n\n    if (req.url === '/' && req.method === 'GET') {\n        res.end('欢迎来到首页');\n    } else if (req.url === '/about' && req.method === 'GET') {\n        res.end('这是关于页面');\n    } else {\n        // 没匹配到的地址，返回 404\n        res.statusCode = 404;\n        res.end('页面不存在');\n    }\n});\n\nserver.listen(3000);\n",[1566,1975,1976,1992,1996,2026,2054,2058,2109,2131,2179,2200,2208,2213,2231,2253,2259,2268,2273],{"__ignoreMap":1576},[1580,1977,1978,1980,1982,1984,1986,1988,1990],{"class":1582,"line":1583},[1580,1979,1587],{"class":1586},[1580,1981,1591],{"class":1590},[1580,1983,1594],{"class":1586},[1580,1985,1598],{"class":1597},[1580,1987,1602],{"class":1601},[1580,1989,1605],{"class":1597},[1580,1991,1608],{"class":1597},[1580,1993,1994],{"class":1582,"line":1611},[1580,1995,1615],{"emptyLinePlaceholder":1614},[1580,1997,1998,2000,2002,2004,2006,2008,2010,2012,2014,2016,2018,2020,2022,2024],{"class":1582,"line":1618},[1580,1999,1629],{"class":1628},[1580,2001,1632],{"class":1590},[1580,2003,1635],{"class":1597},[1580,2005,1638],{"class":1590},[1580,2007,1641],{"class":1597},[1580,2009,1645],{"class":1644},[1580,2011,1648],{"class":1590},[1580,2013,1648],{"class":1597},[1580,2015,1654],{"class":1653},[1580,2017,1657],{"class":1597},[1580,2019,1660],{"class":1653},[1580,2021,1663],{"class":1597},[1580,2023,1666],{"class":1628},[1580,2025,1669],{"class":1597},[1580,2027,2028,2030,2032,2034,2036,2038,2040,2042,2044,2046,2048,2050,2052],{"class":1582,"line":1625},[1580,2029,1675],{"class":1590},[1580,2031,1641],{"class":1597},[1580,2033,1839],{"class":1644},[1580,2035,1648],{"class":1683},[1580,2037,1605],{"class":1597},[1580,2039,1890],{"class":1601},[1580,2041,1605],{"class":1597},[1580,2043,1657],{"class":1597},[1580,2045,1598],{"class":1597},[1580,2047,1899],{"class":1601},[1580,2049,1605],{"class":1597},[1580,2051,1663],{"class":1683},[1580,2053,1608],{"class":1597},[1580,2055,2056],{"class":1582,"line":1672},[1580,2057,1615],{"emptyLinePlaceholder":1614},[1580,2059,2060,2063,2066,2068,2070,2073,2076,2078,2081,2083,2086,2089,2091,2094,2096,2098,2101,2103,2106],{"class":1582,"line":1697},[1580,2061,2062],{"class":1586},"    if",[1580,2064,2065],{"class":1683}," (",[1580,2067,1654],{"class":1590},[1580,2069,1641],{"class":1597},[1580,2071,2072],{"class":1590},"url",[1580,2074,2075],{"class":1597}," ===",[1580,2077,1598],{"class":1597},[1580,2079,2080],{"class":1601},"/",[1580,2082,1605],{"class":1597},[1580,2084,2085],{"class":1597}," &&",[1580,2087,2088],{"class":1590}," req",[1580,2090,1641],{"class":1597},[1580,2092,2093],{"class":1590},"method",[1580,2095,2075],{"class":1597},[1580,2097,1598],{"class":1597},[1580,2099,2100],{"class":1601},"GET",[1580,2102,1605],{"class":1597},[1580,2104,2105],{"class":1683},") ",[1580,2107,2108],{"class":1597},"{\n",[1580,2110,2111,2114,2116,2118,2120,2122,2125,2127,2129],{"class":1582,"line":1707},[1580,2112,2113],{"class":1590},"        res",[1580,2115,1641],{"class":1597},[1580,2117,1680],{"class":1644},[1580,2119,1648],{"class":1683},[1580,2121,1605],{"class":1597},[1580,2123,2124],{"class":1601},"欢迎来到首页",[1580,2126,1605],{"class":1597},[1580,2128,1663],{"class":1683},[1580,2130,1608],{"class":1597},[1580,2132,2133,2136,2139,2142,2144,2146,2148,2150,2152,2154,2157,2159,2161,2163,2165,2167,2169,2171,2173,2175,2177],{"class":1582,"line":1712},[1580,2134,2135],{"class":1597},"    }",[1580,2137,2138],{"class":1586}," else",[1580,2140,2141],{"class":1586}," if",[1580,2143,2065],{"class":1683},[1580,2145,1654],{"class":1590},[1580,2147,1641],{"class":1597},[1580,2149,2072],{"class":1590},[1580,2151,2075],{"class":1597},[1580,2153,1598],{"class":1597},[1580,2155,2156],{"class":1601},"/about",[1580,2158,1605],{"class":1597},[1580,2160,2085],{"class":1597},[1580,2162,2088],{"class":1590},[1580,2164,1641],{"class":1597},[1580,2166,2093],{"class":1590},[1580,2168,2075],{"class":1597},[1580,2170,1598],{"class":1597},[1580,2172,2100],{"class":1601},[1580,2174,1605],{"class":1597},[1580,2176,2105],{"class":1683},[1580,2178,2108],{"class":1597},[1580,2180,2181,2183,2185,2187,2189,2191,2194,2196,2198],{"class":1582,"line":1718},[1580,2182,2113],{"class":1590},[1580,2184,1641],{"class":1597},[1580,2186,1680],{"class":1644},[1580,2188,1648],{"class":1683},[1580,2190,1605],{"class":1597},[1580,2192,2193],{"class":1601},"这是关于页面",[1580,2195,1605],{"class":1597},[1580,2197,1663],{"class":1683},[1580,2199,1608],{"class":1597},[1580,2201,2202,2204,2206],{"class":1582,"line":1744},[1580,2203,2135],{"class":1597},[1580,2205,2138],{"class":1586},[1580,2207,1669],{"class":1597},[1580,2209,2210],{"class":1582,"line":1768},[1580,2211,2212],{"class":1621},"        // 没匹配到的地址，返回 404\n",[1580,2214,2216,2218,2220,2223,2226,2229],{"class":1582,"line":2215},12,[1580,2217,2113],{"class":1590},[1580,2219,1641],{"class":1597},[1580,2221,2222],{"class":1590},"statusCode",[1580,2224,2225],{"class":1597}," =",[1580,2227,2228],{"class":1731}," 404",[1580,2230,1608],{"class":1597},[1580,2232,2234,2236,2238,2240,2242,2244,2247,2249,2251],{"class":1582,"line":2233},13,[1580,2235,2113],{"class":1590},[1580,2237,1641],{"class":1597},[1580,2239,1680],{"class":1644},[1580,2241,1648],{"class":1683},[1580,2243,1605],{"class":1597},[1580,2245,2246],{"class":1601},"页面不存在",[1580,2248,1605],{"class":1597},[1580,2250,1663],{"class":1683},[1580,2252,1608],{"class":1597},[1580,2254,2256],{"class":1582,"line":2255},14,[1580,2257,2258],{"class":1597},"    }\n",[1580,2260,2262,2264,2266],{"class":1582,"line":2261},15,[1580,2263,1700],{"class":1597},[1580,2265,1663],{"class":1590},[1580,2267,1608],{"class":1597},[1580,2269,2271],{"class":1582,"line":2270},16,[1580,2272,1615],{"emptyLinePlaceholder":1614},[1580,2274,2276,2278,2280,2282,2284,2286,2288],{"class":1582,"line":2275},17,[1580,2277,1721],{"class":1590},[1580,2279,1641],{"class":1597},[1580,2281,1726],{"class":1644},[1580,2283,1648],{"class":1590},[1580,2285,1732],{"class":1731},[1580,2287,1663],{"class":1590},[1580,2289,1608],{"class":1597},[1531,2291,2292,2293,1966,2295,2297],{},"现在访问 ",[1566,2294,2080],{},[1566,2296,2156],{}," 会看到不同内容，访问其他地址会收到 404。这就是路由的朴素实现：Express 等框架本质上就是把这套判断做得更优雅，后面的课程会专门学习。",[1535,2299],{},[1526,2301,2303],{"id":2302},"返回-json-接口","🛠 返回 JSON 接口",[1531,2305,2306,2307,2309,2310,2313,2314,2317],{},"前后端分离项目里，服务器经常返回 JSON 数据。把 ",[1566,2308,1890],{}," 换成 ",[1566,2311,2312],{},"application/json","，内容用 ",[1566,2315,2316],{},"JSON.stringify"," 转换：",[1571,2319,2322],{"className":1573,"code":2320,"filename":2321,"language":1575,"meta":1576,"style":1576},"import http from 'node:http';\n\nconst server = http.createServer((req, res) => {\n    if (req.url === '/api/user') {\n        const user = { name: '小明', age: 18 };\n\n        res.setHeader('Content-Type', 'application/json; charset=utf-8');\n        res.end(JSON.stringify(user));\n    }\n});\n\nserver.listen(3000);\n","api.js",[1566,2323,2324,2340,2344,2374,2399,2438,2442,2471,2499,2503,2511,2515],{"__ignoreMap":1576},[1580,2325,2326,2328,2330,2332,2334,2336,2338],{"class":1582,"line":1583},[1580,2327,1587],{"class":1586},[1580,2329,1591],{"class":1590},[1580,2331,1594],{"class":1586},[1580,2333,1598],{"class":1597},[1580,2335,1602],{"class":1601},[1580,2337,1605],{"class":1597},[1580,2339,1608],{"class":1597},[1580,2341,2342],{"class":1582,"line":1611},[1580,2343,1615],{"emptyLinePlaceholder":1614},[1580,2345,2346,2348,2350,2352,2354,2356,2358,2360,2362,2364,2366,2368,2370,2372],{"class":1582,"line":1618},[1580,2347,1629],{"class":1628},[1580,2349,1632],{"class":1590},[1580,2351,1635],{"class":1597},[1580,2353,1638],{"class":1590},[1580,2355,1641],{"class":1597},[1580,2357,1645],{"class":1644},[1580,2359,1648],{"class":1590},[1580,2361,1648],{"class":1597},[1580,2363,1654],{"class":1653},[1580,2365,1657],{"class":1597},[1580,2367,1660],{"class":1653},[1580,2369,1663],{"class":1597},[1580,2371,1666],{"class":1628},[1580,2373,1669],{"class":1597},[1580,2375,2376,2378,2380,2382,2384,2386,2388,2390,2393,2395,2397],{"class":1582,"line":1625},[1580,2377,2062],{"class":1586},[1580,2379,2065],{"class":1683},[1580,2381,1654],{"class":1590},[1580,2383,1641],{"class":1597},[1580,2385,2072],{"class":1590},[1580,2387,2075],{"class":1597},[1580,2389,1598],{"class":1597},[1580,2391,2392],{"class":1601},"/api/user",[1580,2394,1605],{"class":1597},[1580,2396,2105],{"class":1683},[1580,2398,2108],{"class":1597},[1580,2400,2401,2404,2407,2409,2412,2415,2418,2420,2423,2425,2427,2430,2432,2435],{"class":1582,"line":1672},[1580,2402,2403],{"class":1628},"        const",[1580,2405,2406],{"class":1590}," user",[1580,2408,2225],{"class":1597},[1580,2410,2411],{"class":1597}," {",[1580,2413,2414],{"class":1683}," name",[1580,2416,2417],{"class":1597},":",[1580,2419,1598],{"class":1597},[1580,2421,2422],{"class":1601},"小明",[1580,2424,1605],{"class":1597},[1580,2426,1657],{"class":1597},[1580,2428,2429],{"class":1683}," age",[1580,2431,2417],{"class":1597},[1580,2433,2434],{"class":1731}," 18",[1580,2436,2437],{"class":1597}," };\n",[1580,2439,2440],{"class":1582,"line":1697},[1580,2441,1615],{"emptyLinePlaceholder":1614},[1580,2443,2444,2446,2448,2450,2452,2454,2456,2458,2460,2462,2465,2467,2469],{"class":1582,"line":1707},[1580,2445,2113],{"class":1590},[1580,2447,1641],{"class":1597},[1580,2449,1839],{"class":1644},[1580,2451,1648],{"class":1683},[1580,2453,1605],{"class":1597},[1580,2455,1890],{"class":1601},[1580,2457,1605],{"class":1597},[1580,2459,1657],{"class":1597},[1580,2461,1598],{"class":1597},[1580,2463,2464],{"class":1601},"application/json; charset=utf-8",[1580,2466,1605],{"class":1597},[1580,2468,1663],{"class":1683},[1580,2470,1608],{"class":1597},[1580,2472,2473,2475,2477,2479,2481,2484,2486,2489,2491,2494,2497],{"class":1582,"line":1712},[1580,2474,2113],{"class":1590},[1580,2476,1641],{"class":1597},[1580,2478,1680],{"class":1644},[1580,2480,1648],{"class":1683},[1580,2482,2483],{"class":1590},"JSON",[1580,2485,1641],{"class":1597},[1580,2487,2488],{"class":1644},"stringify",[1580,2490,1648],{"class":1683},[1580,2492,2493],{"class":1590},"user",[1580,2495,2496],{"class":1683},"))",[1580,2498,1608],{"class":1597},[1580,2500,2501],{"class":1582,"line":1718},[1580,2502,2258],{"class":1597},[1580,2504,2505,2507,2509],{"class":1582,"line":1744},[1580,2506,1700],{"class":1597},[1580,2508,1663],{"class":1590},[1580,2510,1608],{"class":1597},[1580,2512,2513],{"class":1582,"line":1768},[1580,2514,1615],{"emptyLinePlaceholder":1614},[1580,2516,2517,2519,2521,2523,2525,2527,2529],{"class":1582,"line":2215},[1580,2518,1721],{"class":1590},[1580,2520,1641],{"class":1597},[1580,2522,1726],{"class":1644},[1580,2524,1648],{"class":1590},[1580,2526,1732],{"class":1731},[1580,2528,1663],{"class":1590},[1580,2530,1608],{"class":1597},[1531,2532,2533,2534,2537,2538,2541],{},"浏览器访问 ",[1566,2535,2536],{},"http://localhost:3000/api/user","，就能看到 ",[1566,2539,2540],{},"{\"name\":\"小明\",\"age\":18}","。这就是后端接口的雏形，前端用 Axios 请求它就能拿到数据。",[1535,2543],{},[1526,2545,2547],{"id":2546},"常见状态码速查","🧾 常见状态码速查",[2549,2550,2551,2567],"table",{},[2552,2553,2554],"thead",{},[2555,2556,2557,2561,2564],"tr",{},[2558,2559,2560],"th",{},"状态码",[2558,2562,2563],{},"含义",[2558,2565,2566],{},"常见场景",[2568,2569,2570,2582,2593],"tbody",{},[2555,2571,2572,2576,2579],{},[2573,2574,2575],"td",{},"200",[2573,2577,2578],{},"成功",[2573,2580,2581],{},"正常返回内容",[2555,2583,2584,2587,2590],{},[2573,2585,2586],{},"404",[2573,2588,2589],{},"未找到",[2573,2591,2592],{},"地址不存在",[2555,2594,2595,2598,2601],{},[2573,2596,2597],{},"500",[2573,2599,2600],{},"服务器内部错误",[2573,2602,2603],{},"代码抛异常了",[1531,2605,2606,2607,2610,2611,2613],{},"设置方式是 ",[1566,2608,2609],{},"res.statusCode = 404","，记得要在 ",[1566,2612,1798],{}," 之前设置。",[1535,2615],{},[1526,2617,2619],{"id":2618},"小节总结","🧾 小节总结",[1779,2621,2622,2625,2637,2644,2652],{},[1782,2623,2624],{},"客户端发请求，服务器返回响应；Node.js 用 http 模块扮演服务器角色。",[1782,2626,2627,2630,2631,2633,2634,2636],{},[1566,2628,2629],{},"http.createServer"," 的回调处理每个请求，",[1566,2632,1798],{}," 必须调用，",[1566,2635,1726],{}," 指定端口。",[1782,2638,2639,2640,2643],{},"返回中文要设置 ",[1566,2641,2642],{},"Content-Type: text/plain; charset=utf-8","，否则浏览器会乱码。",[1782,2645,2646,2647,1966,2649,2651],{},"通过 ",[1566,2648,1965],{},[1566,2650,1969],{}," 可以实现简单路由，未匹配的地址返回 404。",[1782,2653,2654,2655,2657,2658,2660],{},"返回 JSON 接口：",[1566,2656,2312],{}," 加 ",[1566,2659,2316],{},"。",[1535,2662],{},[1526,2664,2666],{"id":2665},"知识问答","❓ 知识问答",[1531,2668,2669],{},[1545,2670,2671],{},"Q1：res.write 和 res.end 有什么区别？",[1531,2673,2674,2677,2678,2681,2682,2684,2685,2687],{},[1566,2675,2676],{},"res.write"," 可以分多次发送内容，",[1566,2679,2680],{},"res.end"," 发送最后的内容并结束响应。简单场景只用 ",[1566,2683,2680],{}," 就够了，每个请求必须有一个 ",[1566,2686,1680],{}," 收尾。",[1531,2689,2690],{},[1545,2691,2692],{},"Q2：改了代码为什么浏览器里不生效？",[1531,2694,2695,2696,2699,2700,2702,2703,2706],{},"服务器代码运行在 Node 进程里，改完需要在终端按 ",[1566,2697,2698],{},"Ctrl+C"," 停止，再重新执行 ",[1566,2701,1815],{},"。开发时也可以用 ",[1566,2704,2705],{},"node --watch server.js","，文件保存后自动重启。",[1531,2708,2709],{},[1545,2710,2711],{},"Q3：启动时报端口被占用怎么办？",[1531,2713,2714,2715,2717],{},"说明 3000 端口已经被其他程序用了。要么关掉占用它的程序，要么把 ",[1566,2716,1726],{}," 的端口换成 3001 等其他值。",[1531,2719,2720],{},[1545,2721,2722],{},"Q4：http 模块和 Express 是什么关系？",[1531,2724,2725],{},"Express 是基于 http 模块封装的框架，把路由、中间件等常用功能做得更方便。先懂 http 模块的原理，再学 Express 会觉得水到渠成。",[1535,2727],{},[1526,2729,2731],{"id":2730},"小练习","🧪 小练习",[1531,2733,2734,2735,2738,2739,2660],{},"在服务器上加一个 ",[1566,2736,2737],{},"/api/time"," 接口，返回当前时间的 JSON，格式为 ",[1566,2740,2741],{},"{ \"time\": \"2024-01-01 12:00:00\" }",[1571,2743,2745],{"className":1573,"code":2744,"filename":1568,"language":1575,"meta":1576,"style":1576},"import http from 'node:http';\n\nconst server = http.createServer((req, res) => {\n    // 请在这里编写代码\n});\n\nserver.listen(3000);\n",[1566,2746,2747,2763,2767,2797,2802,2810,2814],{"__ignoreMap":1576},[1580,2748,2749,2751,2753,2755,2757,2759,2761],{"class":1582,"line":1583},[1580,2750,1587],{"class":1586},[1580,2752,1591],{"class":1590},[1580,2754,1594],{"class":1586},[1580,2756,1598],{"class":1597},[1580,2758,1602],{"class":1601},[1580,2760,1605],{"class":1597},[1580,2762,1608],{"class":1597},[1580,2764,2765],{"class":1582,"line":1611},[1580,2766,1615],{"emptyLinePlaceholder":1614},[1580,2768,2769,2771,2773,2775,2777,2779,2781,2783,2785,2787,2789,2791,2793,2795],{"class":1582,"line":1618},[1580,2770,1629],{"class":1628},[1580,2772,1632],{"class":1590},[1580,2774,1635],{"class":1597},[1580,2776,1638],{"class":1590},[1580,2778,1641],{"class":1597},[1580,2780,1645],{"class":1644},[1580,2782,1648],{"class":1590},[1580,2784,1648],{"class":1597},[1580,2786,1654],{"class":1653},[1580,2788,1657],{"class":1597},[1580,2790,1660],{"class":1653},[1580,2792,1663],{"class":1597},[1580,2794,1666],{"class":1628},[1580,2796,1669],{"class":1597},[1580,2798,2799],{"class":1582,"line":1625},[1580,2800,2801],{"class":1621},"    // 请在这里编写代码\n",[1580,2803,2804,2806,2808],{"class":1582,"line":1672},[1580,2805,1700],{"class":1597},[1580,2807,1663],{"class":1590},[1580,2809,1608],{"class":1597},[1580,2811,2812],{"class":1582,"line":1697},[1580,2813,1615],{"emptyLinePlaceholder":1614},[1580,2815,2816,2818,2820,2822,2824,2826,2828],{"class":1582,"line":1707},[1580,2817,1721],{"class":1590},[1580,2819,1641],{"class":1597},[1580,2821,1726],{"class":1644},[1580,2823,1648],{"class":1590},[1580,2825,1732],{"class":1731},[1580,2827,1663],{"class":1590},[1580,2829,1608],{"class":1597},[1535,2831],{},[1531,2833,2834],{},"🎉 恭喜你已经能独立搭建 Web 服务器了！下一篇我们深入 Node.js 的心脏：事件循环与异步机制。",[2836,2837,2838],"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 .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 .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}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 .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 .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}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: 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var(--shiki-dark-text-decoration);}",{"title":1576,"searchDepth":1611,"depth":1611,"links":2840},[2841,2842,2843,2844,2845,2846,2847,2848,2849,2850],{"id":1528,"depth":1611,"text":1529},{"id":1539,"depth":1611,"text":1540},{"id":1560,"depth":1611,"text":1561},{"id":1825,"depth":1611,"text":1826},{"id":1955,"depth":1611,"text":1956},{"id":2302,"depth":1611,"text":2303},{"id":2546,"depth":1611,"text":2547},{"id":2618,"depth":1611,"text":2619},{"id":2665,"depth":1611,"text":2666},{"id":2730,"depth":1611,"text":2731},"掌握 Node.js http 模块创建服务器、处理请求与响应的方法，理解请求、响应、状态码与简单路由。","md",null,{},{"title":1134},{"title":1521,"description":2851},"DDRuqViSnG",[2859,2861],{"title":1130,"path":1131,"stem":1132,"description":2860,"children":-1},"掌握 Node.js path 模块拼接和解析路径的常用方法，分清 __dirname 与 process.cwd() 的区别。",{"title":1138,"path":1139,"stem":1140,"description":2862,"children":-1},"理解 Node.js 单线程与事件循环的工作原理，掌握同步代码与各类异步 API 的执行顺序。",1784715110216]