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res.send('删除一个用户');\n});\n\napp.listen(3000);\n","app.js","js","",[1535,1578,1579,1609,1616,1638,1643,1688,1713,1723,1728,1762,1784,1793,1798,1832,1854,1863,1868,1902,1924,1933,1938],{"__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"," express ",[1580,1593,1594],{"class":1586},"from",[1580,1596,1598],{"class":1597},"s86vT"," '",[1580,1600,1602],{"class":1601},"sIEYB","express",[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",[1580,1617,1619,1623,1626,1629,1633,1636],{"class":1582,"line":1618},3,[1580,1620,1622],{"class":1621},"s50WR","const",[1580,1624,1625],{"class":1590}," app ",[1580,1627,1628],{"class":1597},"=",[1580,1630,1632],{"class":1631},"swgpB"," 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res",[1580,1695,1651],{"class":1597},[1580,1697,1698],{"class":1631},"send",[1580,1700,1657],{"class":1701},"sd2Uz",[1580,1703,1605],{"class":1597},[1580,1705,1706],{"class":1601},"获取用户列表",[1580,1708,1605],{"class":1597},[1580,1710,1681],{"class":1701},[1580,1712,1608],{"class":1597},[1580,1714,1716,1719,1721],{"class":1582,"line":1715},7,[1580,1717,1718],{"class":1597},"}",[1580,1720,1681],{"class":1590},[1580,1722,1608],{"class":1597},[1580,1724,1726],{"class":1582,"line":1725},8,[1580,1727,1615],{"emptyLinePlaceholder":1614},[1580,1729,1731,1733,1735,1738,1740,1742,1744,1746,1748,1750,1752,1754,1756,1758,1760],{"class":1582,"line":1730},9,[1580,1732,1648],{"class":1590},[1580,1734,1651],{"class":1597},[1580,1736,1737],{"class":1631},"post",[1580,1739,1657],{"class":1590},[1580,1741,1605],{"class":1597},[1580,1743,1555],{"class":1601},[1580,1745,1605],{"class":1597},[1580,1747,1666],{"class":1597},[1580,1749,1669],{"class":1597},[1580,1751,1673],{"class":1672},[1580,1753,1666],{"class":1597},[1580,1755,1678],{"class":1672},[1580,1757,1681],{"class":1597},[1580,1759,1684],{"class":1621},[1580,1761,1687],{"class":1597},[1580,1763,1765,1767,1769,1771,1773,1775,1778,1780,1782],{"class":1582,"line":1764},10,[1580,1766,1693],{"class":1590},[1580,1768,1651],{"class":1597},[1580,1770,1698],{"class":1631},[1580,1772,1657],{"class":1701},[1580,1774,1605],{"class":1597},[1580,1776,1777],{"class":1601},"新增一个用户",[1580,1779,1605],{"class":1597},[1580,1781,1681],{"class":1701},[1580,1783,1608],{"class":1597},[1580,1785,1787,1789,1791],{"class":1582,"line":1786},11,[1580,1788,1718],{"class":1597},[1580,1790,1681],{"class":1590},[1580,1792,1608],{"class":1597},[1580,1794,1796],{"class":1582,"line":1795},12,[1580,1797,1615],{"emptyLinePlaceholder":1614},[1580,1799,1801,1803,1805,1808,1810,1812,1814,1816,1818,1820,1822,1824,1826,1828,1830],{"class":1582,"line":1800},13,[1580,1802,1648],{"class":1590},[1580,1804,1651],{"class":1597},[1580,1806,1807],{"class":1631},"put",[1580,1809,1657],{"class":1590},[1580,1811,1605],{"class":1597},[1580,1813,1555],{"class":1601},[1580,1815,1605],{"class":1597},[1580,1817,1666],{"class":1597},[1580,1819,1669],{"class":1597},[1580,1821,1673],{"class":1672},[1580,1823,1666],{"class":1597},[1580,1825,1678],{"class":1672},[1580,1827,1681],{"class":1597},[1580,1829,1684],{"class":1621},[1580,1831,1687],{"class":1597},[1580,1833,1835,1837,1839,1841,1843,1845,1848,1850,1852],{"class":1582,"line":1834},14,[1580,1836,1693],{"class":1590},[1580,1838,1651],{"class":1597},[1580,1840,1698],{"class":1631},[1580,1842,1657],{"class":1701},[1580,1844,1605],{"class":1597},[1580,1846,1847],{"class":1601},"更新用户信息",[1580,1849,1605],{"class":1597},[1580,1851,1681],{"class":1701},[1580,1853,1608],{"class":1597},[1580,1855,1857,1859,1861],{"class":1582,"line":1856},15,[1580,1858,1718],{"class":1597},[1580,1860,1681],{"class":1590},[1580,1862,1608],{"class":1597},[1580,1864,1866],{"class":1582,"line":1865},16,[1580,1867,1615],{"emptyLinePlaceholder":1614},[1580,1869,1871,1873,1875,1878,1880,1882,1884,1886,1888,1890,1892,1894,1896,1898,1900],{"class":1582,"line":1870},17,[1580,1872,1648],{"class":1590},[1580,1874,1651],{"class":1597},[1580,1876,1877],{"class":1631},"delete",[1580,1879,1657],{"class":1590},[1580,1881,1605],{"class":1597},[1580,1883,1555],{"class":1601},[1580,1885,1605],{"class":1597},[1580,1887,1666],{"class":1597},[1580,1889,1669],{"class":1597},[1580,1891,1673],{"class":1672},[1580,1893,1666],{"class":1597},[1580,1895,1678],{"class":1672},[1580,1897,1681],{"class":1597},[1580,1899,1684],{"class":1621},[1580,1901,1687],{"class":1597},[1580,1903,1905,1907,1909,1911,1913,1915,1918,1920,1922],{"class":1582,"line":1904},18,[1580,1906,1693],{"class":1590},[1580,1908,1651],{"class":1597},[1580,1910,1698],{"class":1631},[1580,1912,1657],{"class":1701},[1580,1914,1605],{"class":1597},[1580,1916,1917],{"class":1601},"删除一个用户",[1580,1919,1605],{"class":1597},[1580,1921,1681],{"class":1701},[1580,1923,1608],{"class":1597},[1580,1925,1927,1929,1931],{"class":1582,"line":1926},19,[1580,1928,1718],{"class":1597},[1580,1930,1681],{"class":1590},[1580,1932,1608],{"class":1597},[1580,1934,1936],{"class":1582,"line":1935},20,[1580,1937,1615],{"emptyLinePlaceholder":1614},[1580,1939,1941,1943,1945,1948,1950,1954,1956],{"class":1582,"line":1940},21,[1580,1942,1648],{"class":1590},[1580,1944,1651],{"class":1597},[1580,1946,1947],{"class":1631},"listen",[1580,1949,1657],{"class":1590},[1580,1951,1953],{"class":1952},"smPcV","3000",[1580,1955,1681],{"class":1590},[1580,1957,1608],{"class":1597},[1531,1959,1960],{},"地址相同、方法不同，会被路由到不同的处理函数，它们各司其职：",[1962,1963,1964,1971,1977,1983],"ul",{},[1965,1966,1967,1970],"li",{},[1535,1968,1969],{},"GET","：查询数据，浏览器地址栏直接访问就是 GET 请求。",[1965,1972,1973,1976],{},[1535,1974,1975],{},"POST","：新增数据，通常携带请求体。",[1965,1978,1979,1982],{},[1535,1980,1981],{},"PUT","：更新数据。",[1965,1984,1985,1988],{},[1535,1986,1987],{},"DELETE","：删除数据。",[1990,1991,1992],"tip",{},[1531,1993,1994],{},"浏览器地址栏只能发起 GET 请求，想调试 POST、PUT、DELETE，可以在终端用 curl，或者借助接口调试工具，后面的文章会专门讲。",[1540,1996],{},[1526,1998,2000],{"id":1999},"路径参数-reqparams","🛠 路径参数 req.params",[1531,2002,2003,2004,2007,2008,2011],{},"接口经常需要根据 ID 操作某条数据，比如 ",[1535,2005,2006],{},"/users/1"," 表示 1 号用户。ID 是变化的，不能为每个用户写一条路由，这时用",[1549,2009,2010],{},"路径参数","：",[1570,2013,2015],{"className":1572,"code":2014,"filename":1574,"language":1575,"meta":1576,"style":1576},"app.get('/users/:id', (req, res) => {\n    res.send(`用户详情：${req.params.id}`);\n});\n",[1535,2016,2017,2050,2088],{"__ignoreMap":1576},[1580,2018,2019,2021,2023,2025,2027,2029,2032,2034,2036,2038,2040,2042,2044,2046,2048],{"class":1582,"line":1583},[1580,2020,1648],{"class":1590},[1580,2022,1651],{"class":1597},[1580,2024,1654],{"class":1631},[1580,2026,1657],{"class":1590},[1580,2028,1605],{"class":1597},[1580,2030,2031],{"class":1601},"/users/:id",[1580,2033,1605],{"class":1597},[1580,2035,1666],{"class":1597},[1580,2037,1669],{"class":1597},[1580,2039,1673],{"class":1672},[1580,2041,1666],{"class":1597},[1580,2043,1678],{"class":1672},[1580,2045,1681],{"class":1597},[1580,2047,1684],{"class":1621},[1580,2049,1687],{"class":1597},[1580,2051,2052,2054,2056,2058,2060,2063,2066,2069,2071,2073,2076,2078,2081,2084,2086],{"class":1582,"line":1611},[1580,2053,1693],{"class":1590},[1580,2055,1651],{"class":1597},[1580,2057,1698],{"class":1631},[1580,2059,1657],{"class":1701},[1580,2061,2062],{"class":1597},"`",[1580,2064,2065],{"class":1601},"用户详情：",[1580,2067,2068],{"class":1597},"${",[1580,2070,1673],{"class":1590},[1580,2072,1651],{"class":1597},[1580,2074,2075],{"class":1590},"params",[1580,2077,1651],{"class":1597},[1580,2079,2080],{"class":1590},"id",[1580,2082,2083],{"class":1597},"}`",[1580,2085,1681],{"class":1701},[1580,2087,1608],{"class":1597},[1580,2089,2090,2092,2094],{"class":1582,"line":1618},[1580,2091,1718],{"class":1597},[1580,2093,1681],{"class":1590},[1580,2095,1608],{"class":1597},[1531,2097,2098,2099,2102,2103,2105,2106,2109,2110,2113],{},"路径里的 ",[1535,2100,2101],{},":id"," 是占位符，访问 ",[1535,2104,2006],{},"、",[1535,2107,2108],{},"/users/99"," 都能匹配这条路由，实际的值通过 ",[1535,2111,2112],{},"req.params.id"," 拿到。",[2115,2116,2117],"warning",{},[1531,2118,2119,2122,2123,2126,2127,2129,2130,2132,2133,2136,2137,2140,2141,2144],{},[1535,2120,2121],{},"req.params"," 拿到的值",[1549,2124,2125],{},"永远是字符串","。访问 ",[1535,2128,2006],{}," 时 ",[1535,2131,2112],{}," 是 ",[1535,2134,2135],{},"'1'"," 而不是数字 ",[1535,2138,2139],{},"1","，需要数字计算时记得用 ",[1535,2142,2143],{},"Number()"," 转换。",[1540,2146],{},[1526,2148,2150],{"id":2149},"查询参数-reqquery","🛠 查询参数 req.query",[1531,2152,2153,2154,2157,2158,2161,2162,2165],{},"URL 问号后面的键值对叫",[1549,2155,2156],{},"查询参数","，常用于分页、筛选，比如 ",[1535,2159,2160],{},"/users?page=2&size=10","。Express 自动解析好放在 ",[1535,2163,2164],{},"req.query"," 里：",[1570,2167,2169],{"className":1572,"code":2168,"filename":1574,"language":1575,"meta":1576,"style":1576},"app.get('/users', (req, res) => {\n    const { page, size } = req.query;\n\n    res.send(`第 ${page} 页，每页 ${size} 条`);\n});\n",[1535,2170,2171,2203,2235,2239,2280],{"__ignoreMap":1576},[1580,2172,2173,2175,2177,2179,2181,2183,2185,2187,2189,2191,2193,2195,2197,2199,2201],{"class":1582,"line":1583},[1580,2174,1648],{"class":1590},[1580,2176,1651],{"class":1597},[1580,2178,1654],{"class":1631},[1580,2180,1657],{"class":1590},[1580,2182,1605],{"class":1597},[1580,2184,1555],{"class":1601},[1580,2186,1605],{"class":1597},[1580,2188,1666],{"class":1597},[1580,2190,1669],{"class":1597},[1580,2192,1673],{"class":1672},[1580,2194,1666],{"class":1597},[1580,2196,1678],{"class":1672},[1580,2198,1681],{"class":1597},[1580,2200,1684],{"class":1621},[1580,2202,1687],{"class":1597},[1580,2204,2205,2208,2211,2214,2216,2219,2222,2225,2228,2230,2233],{"class":1582,"line":1611},[1580,2206,2207],{"class":1621},"    const",[1580,2209,2210],{"class":1597}," {",[1580,2212,2213],{"class":1590}," page",[1580,2215,1666],{"class":1597},[1580,2217,2218],{"class":1590}," size",[1580,2220,2221],{"class":1597}," }",[1580,2223,2224],{"class":1597}," =",[1580,2226,2227],{"class":1590}," req",[1580,2229,1651],{"class":1597},[1580,2231,2232],{"class":1590},"query",[1580,2234,1608],{"class":1597},[1580,2236,2237],{"class":1582,"line":1618},[1580,2238,1615],{"emptyLinePlaceholder":1614},[1580,2240,2241,2243,2245,2247,2249,2251,2254,2256,2259,2261,2264,2266,2269,2271,2274,2276,2278],{"class":1582,"line":1640},[1580,2242,1693],{"class":1590},[1580,2244,1651],{"class":1597},[1580,2246,1698],{"class":1631},[1580,2248,1657],{"class":1701},[1580,2250,2062],{"class":1597},[1580,2252,2253],{"class":1601},"第 ",[1580,2255,2068],{"class":1597},[1580,2257,2258],{"class":1590},"page",[1580,2260,1718],{"class":1597},[1580,2262,2263],{"class":1601}," 页，每页 ",[1580,2265,2068],{"class":1597},[1580,2267,2268],{"class":1590},"size",[1580,2270,1718],{"class":1597},[1580,2272,2273],{"class":1601}," 条",[1580,2275,2062],{"class":1597},[1580,2277,1681],{"class":1701},[1580,2279,1608],{"class":1597},[1580,2281,2282,2284,2286],{"class":1582,"line":1645},[1580,2283,1718],{"class":1597},[1580,2285,1681],{"class":1590},[1580,2287,1608],{"class":1597},[1531,2289,2290,2291,2294],{},"访问 ",[1535,2292,2293],{},"http://localhost:3000/users?page=2&size=10","，就会返回“第 2 页，每页 10 条”。",[1990,2296,2297],{},[1531,2298,2299,2300,2302],{},"在 Express 5 中，",[1535,2301,2164],{}," 是一个只读的 getter 属性，读取没问题，但不要尝试给它重新赋值。",[1540,2304],{},[1526,2306,2308],{"id":2307},"路径参数与查询参数怎么选","⚡ 路径参数与查询参数怎么选",[1531,2310,2311],{},"两者都能从 URL 里带数据，使用场景不同：",[1962,2313,2314,2322],{},[1965,2315,2316,2318,2319,2321],{},[1549,2317,2010],{},"：定位某一条具体资源，是 URL 结构的一部分，如 ",[1535,2320,2006],{},"。",[1965,2323,2324,2326,2327,2321],{},[1549,2325,2156],{},"：附加的筛选条件，可有可无，如 ",[1535,2328,2329],{},"?page=2&keyword=张",[1531,2331,2332],{},"记住一个判断标准：少了它接口就不知道操作谁，用路径参数；少了它接口依然能用默认值工作，用查询参数。",[1540,2334],{},[1526,2336,2338],{"id":2337},"用-expressrouter-拆分路由","🛠 用 express.Router 拆分路由",[1531,2340,2341,2342,2344,2345,2348],{},"所有路由都堆在 ",[1535,2343,1574],{}," 里，接口一多就没法维护。",[1549,2346,2347],{},"Router 是一个迷你版的路由对象","，可以把同一类路由拆到独立文件：",[1570,2350,2353],{"className":1572,"code":2351,"filename":2352,"language":1575,"meta":1576,"style":1576},"import { Router } from 'express';\n\nconst router = Router();\n\n// 这里的 / 实际对应挂载路径 /users\nrouter.get('/', (req, res) => {\n    res.send('用户列表');\n});\n\nrouter.get('/:id', (req, res) => {\n    res.send(`用户详情：${req.params.id}`);\n});\n\nexport default router;\n","routes/user.js",[1535,2354,2355,2377,2381,2396,2400,2406,2440,2461,2469,2473,2506,2538,2546,2550],{"__ignoreMap":1576},[1580,2356,2357,2359,2361,2364,2366,2369,2371,2373,2375],{"class":1582,"line":1583},[1580,2358,1587],{"class":1586},[1580,2360,2210],{"class":1597},[1580,2362,2363],{"class":1590}," Router",[1580,2365,2221],{"class":1597},[1580,2367,2368],{"class":1586}," from",[1580,2370,1598],{"class":1597},[1580,2372,1602],{"class":1601},[1580,2374,1605],{"class":1597},[1580,2376,1608],{"class":1597},[1580,2378,2379],{"class":1582,"line":1611},[1580,2380,1615],{"emptyLinePlaceholder":1614},[1580,2382,2383,2385,2388,2390,2392,2394],{"class":1582,"line":1618},[1580,2384,1622],{"class":1621},[1580,2386,2387],{"class":1590}," router ",[1580,2389,1628],{"class":1597},[1580,2391,2363],{"class":1631},[1580,2393,1635],{"class":1590},[1580,2395,1608],{"class":1597},[1580,2397,2398],{"class":1582,"line":1640},[1580,2399,1615],{"emptyLinePlaceholder":1614},[1580,2401,2402],{"class":1582,"line":1645},[1580,2403,2405],{"class":2404},"syuKq","// 这里的 / 实际对应挂载路径 /users\n",[1580,2407,2408,2411,2413,2415,2417,2419,2422,2424,2426,2428,2430,2432,2434,2436,2438],{"class":1582,"line":1690},[1580,2409,2410],{"class":1590},"router",[1580,2412,1651],{"class":1597},[1580,2414,1654],{"class":1631},[1580,2416,1657],{"class":1590},[1580,2418,1605],{"class":1597},[1580,2420,2421],{"class":1601},"/",[1580,2423,1605],{"class":1597},[1580,2425,1666],{"class":1597},[1580,2427,1669],{"class":1597},[1580,2429,1673],{"class":1672},[1580,2431,1666],{"class":1597},[1580,2433,1678],{"class":1672},[1580,2435,1681],{"class":1597},[1580,2437,1684],{"class":1621},[1580,2439,1687],{"class":1597},[1580,2441,2442,2444,2446,2448,2450,2452,2455,2457,2459],{"class":1582,"line":1715},[1580,2443,1693],{"class":1590},[1580,2445,1651],{"class":1597},[1580,2447,1698],{"class":1631},[1580,2449,1657],{"class":1701},[1580,2451,1605],{"class":1597},[1580,2453,2454],{"class":1601},"用户列表",[1580,2456,1605],{"class":1597},[1580,2458,1681],{"class":1701},[1580,2460,1608],{"class":1597},[1580,2462,2463,2465,2467],{"class":1582,"line":1725},[1580,2464,1718],{"class":1597},[1580,2466,1681],{"class":1590},[1580,2468,1608],{"class":1597},[1580,2470,2471],{"class":1582,"line":1730},[1580,2472,1615],{"emptyLinePlaceholder":1614},[1580,2474,2475,2477,2479,2481,2483,2485,2488,2490,2492,2494,2496,2498,2500,2502,2504],{"class":1582,"line":1764},[1580,2476,2410],{"class":1590},[1580,2478,1651],{"class":1597},[1580,2480,1654],{"class":1631},[1580,2482,1657],{"class":1590},[1580,2484,1605],{"class":1597},[1580,2486,2487],{"class":1601},"/:id",[1580,2489,1605],{"class":1597},[1580,2491,1666],{"class":1597},[1580,2493,1669],{"class":1597},[1580,2495,1673],{"class":1672},[1580,2497,1666],{"class":1597},[1580,2499,1678],{"class":1672},[1580,2501,1681],{"class":1597},[1580,2503,1684],{"class":1621},[1580,2505,1687],{"class":1597},[1580,2507,2508,2510,2512,2514,2516,2518,2520,2522,2524,2526,2528,2530,2532,2534,2536],{"class":1582,"line":1786},[1580,2509,1693],{"class":1590},[1580,2511,1651],{"class":1597},[1580,2513,1698],{"class":1631},[1580,2515,1657],{"class":1701},[1580,2517,2062],{"class":1597},[1580,2519,2065],{"class":1601},[1580,2521,2068],{"class":1597},[1580,2523,1673],{"class":1590},[1580,2525,1651],{"class":1597},[1580,2527,2075],{"class":1590},[1580,2529,1651],{"class":1597},[1580,2531,2080],{"class":1590},[1580,2533,2083],{"class":1597},[1580,2535,1681],{"class":1701},[1580,2537,1608],{"class":1597},[1580,2539,2540,2542,2544],{"class":1582,"line":1795},[1580,2541,1718],{"class":1597},[1580,2543,1681],{"class":1590},[1580,2545,1608],{"class":1597},[1580,2547,2548],{"class":1582,"line":1800},[1580,2549,1615],{"emptyLinePlaceholder":1614},[1580,2551,2552,2555,2558,2561],{"class":1582,"line":1834},[1580,2553,2554],{"class":1586},"export",[1580,2556,2557],{"class":1586}," default",[1580,2559,2560],{"class":1590}," router",[1580,2562,1608],{"class":1597},[1531,2564,2565],{},"然后在入口文件里挂载：",[1570,2567,2569],{"className":1572,"code":2568,"filename":1574,"language":1575,"meta":1576,"style":1576},"import express from 'express';\nimport userRouter from './routes/user.js';\n\nconst app = express();\n\n// 以 /users 开头请求交给 userRouter 处理\napp.use('/users', userRouter);\n\napp.listen(3000);\n",[1535,2570,2571,2587,2605,2609,2623,2627,2632,2656,2660],{"__ignoreMap":1576},[1580,2572,2573,2575,2577,2579,2581,2583,2585],{"class":1582,"line":1583},[1580,2574,1587],{"class":1586},[1580,2576,1591],{"class":1590},[1580,2578,1594],{"class":1586},[1580,2580,1598],{"class":1597},[1580,2582,1602],{"class":1601},[1580,2584,1605],{"class":1597},[1580,2586,1608],{"class":1597},[1580,2588,2589,2591,2594,2596,2598,2601,2603],{"class":1582,"line":1611},[1580,2590,1587],{"class":1586},[1580,2592,2593],{"class":1590}," userRouter ",[1580,2595,1594],{"class":1586},[1580,2597,1598],{"class":1597},[1580,2599,2600],{"class":1601},"./routes/user.js",[1580,2602,1605],{"class":1597},[1580,2604,1608],{"class":1597},[1580,2606,2607],{"class":1582,"line":1618},[1580,2608,1615],{"emptyLinePlaceholder":1614},[1580,2610,2611,2613,2615,2617,2619,2621],{"class":1582,"line":1640},[1580,2612,1622],{"class":1621},[1580,2614,1625],{"class":1590},[1580,2616,1628],{"class":1597},[1580,2618,1632],{"class":1631},[1580,2620,1635],{"class":1590},[1580,2622,1608],{"class":1597},[1580,2624,2625],{"class":1582,"line":1645},[1580,2626,1615],{"emptyLinePlaceholder":1614},[1580,2628,2629],{"class":1582,"line":1690},[1580,2630,2631],{"class":2404},"// 以 /users 开头请求交给 userRouter 处理\n",[1580,2633,2634,2636,2638,2641,2643,2645,2647,2649,2651,2654],{"class":1582,"line":1715},[1580,2635,1648],{"class":1590},[1580,2637,1651],{"class":1597},[1580,2639,2640],{"class":1631},"use",[1580,2642,1657],{"class":1590},[1580,2644,1605],{"class":1597},[1580,2646,1555],{"class":1601},[1580,2648,1605],{"class":1597},[1580,2650,1666],{"class":1597},[1580,2652,2653],{"class":1590}," userRouter)",[1580,2655,1608],{"class":1597},[1580,2657,2658],{"class":1582,"line":1725},[1580,2659,1615],{"emptyLinePlaceholder":1614},[1580,2661,2662,2664,2666,2668,2670,2672,2674],{"class":1582,"line":1730},[1580,2663,1648],{"class":1590},[1580,2665,1651],{"class":1597},[1580,2667,1947],{"class":1631},[1580,2669,1657],{"class":1590},[1580,2671,1953],{"class":1952},[1580,2673,1681],{"class":1590},[1580,2675,1608],{"class":1597},[1531,2677,2678,2679,2681,2682,2684,2685,2687,2688,2691,2692,2695],{},"这样访问 ",[1535,2680,1555],{}," 和 ",[1535,2683,2006],{}," 都会进入 ",[1535,2686,2352],{},"。以后再加文章路由，就新建 ",[1535,2689,2690],{},"routes/article.js"," 挂载到 ",[1535,2693,2694],{},"/articles","，每个文件只管自己的事。",[2115,2697,2698],{},[1531,2699,2700,2701,2704,2705,2708],{},"ESM 导入本地文件必须写完整后缀 ",[1535,2702,2703],{},".js","，写 ",[1535,2706,2707],{},"import userRouter from './routes/user'"," 会报找不到模块，这一点上一个 Node.js 课程强调过。",[1540,2710],{},[1526,2712,2714],{"id":2713},"all-与-use-的区别","💡 all 与 use 的区别",[1531,2716,2717],{},"除了按方法注册，还有两个不太常用的写法，了解即可：",[1962,2719,2720,2726],{},[1965,2721,2722,2725],{},[1535,2723,2724],{},"app.all('/users', handler)","：不管 GET、POST 还是其他方法，统统走这个处理函数。",[1965,2727,2728,2731,2732,2734],{},[1535,2729,2730],{},"app.use('/users', handler)","：匹配以 ",[1535,2733,1555],{}," 开头的所有路径、所有方法，常用于挂载 Router 和中间件。",[1531,2736,2737,2740,2741,2743,2744,2105,2747,2750],{},[1535,2738,2739],{},"all"," 要求路径精确匹配，",[1535,2742,2640],{}," 是前缀匹配，这是两者关键的区别。日常开发里按具体方法写 ",[1535,2745,2746],{},"app.get",[1535,2748,2749],{},"app.post"," 才是主流。",[1540,2752],{},[1526,2754,2756],{"id":2755},"小节总结","🧾 小节总结",[1962,2758,2759,2773,2782,2788,2797],{},[1965,2760,2761,2762,2105,2764,2105,2766,2105,2769,2772],{},"路由是“地址 + 请求方法”到处理函数的映射，Express 用 ",[1535,2763,2746],{},[1535,2765,2749],{},[1535,2767,2768],{},"app.put",[1535,2770,2771],{},"app.delete"," 注册。",[1965,2774,2775,2776,2778,2779,2781],{},"路径参数用 ",[1535,2777,2101],{}," 占位，通过 ",[1535,2780,2121],{}," 读取，拿到的值是字符串。",[1965,2783,2784,2785,2787],{},"查询参数是问号后的键值对，通过 ",[1535,2786,2164],{}," 读取，Express 5 中它是只读的。",[1965,2789,2790,2792,2793,2796],{},[1535,2791,1537],{}," 可以把一类路由拆到独立文件，再用 ",[1535,2794,2795],{},"app.use('/users', router)"," 挂载。",[1965,2798,2799,2802,2803,2806],{},[1535,2800,2801],{},"app.all"," 匹配所有方法且路径精确，",[1535,2804,2805],{},"app.use"," 匹配所有方法且按前缀匹配。",[1540,2808],{},[1526,2810,2812],{"id":2811},"知识问答","❓ 知识问答",[1531,2814,2815],{},[1549,2816,2817],{},"Q1：路径参数和查询参数能同时用吗？",[1531,2819,2820,2821,2824,2825,2827,2828,2831],{},"可以。比如 ",[1535,2822,2823],{},"/users/1/comments?page=2","，",[1535,2826,2112],{}," 拿到用户 ID，",[1535,2829,2830],{},"req.query.page"," 拿到页码，互不干扰。",[1531,2833,2834],{},[1549,2835,2836,2837,2681,2839,2842,2843,2845],{},"Q2：",[1535,2838,2031],{},[1535,2840,2841],{},"/users/new"," 两条路由都写了，访问 ",[1535,2844,2841],{}," 走哪条？",[1531,2847,2848,2849,2851,2852,2854,2855,2858,2859,2321],{},"Express 按注册顺序匹配，先注册的先命中。想让 ",[1535,2850,2841],{}," 生效，要把它写在 ",[1535,2853,2031],{}," 前面，否则 ",[1535,2856,2857],{},"new"," 会被当成 ",[1535,2860,2080],{},[1531,2862,2863],{},[1549,2864,2865],{},"Q3：Router 拆出去后，路径要怎么写？",[1531,2867,2868,2869,2871,2872,2874,2875,2824,2877,2874,2879,2881],{},"Router 文件里写相对路径。挂载时指定了 ",[1535,2870,1555],{},"，Router 里的 ",[1535,2873,2421],{}," 就是 ",[1535,2876,1555],{},[1535,2878,2487],{},[1535,2880,2031],{},"，不要在 Router 里再写一遍完整路径。",[1531,2883,2884],{},[1549,2885,2886],{},"Q4：GET 请求能带请求体吗？",[1531,2888,2889],{},"规范上 GET 没有请求体，要传数据就用路径参数或查询参数。需要提交数据时，请使用 POST、PUT 等方法。",[1540,2891],{},[1526,2893,2895],{"id":2894},"小练习","🧪 小练习",[1531,2897,2898],{},"为图书模块写路由并拆分到独立文件：",[2900,2901,2902,2917],"ol",{},[1965,2903,2904,2905,2908,2909,2912,2913,2916],{},"新建 ",[1535,2906,2907],{},"routes/book.js","，定义两条路由：",[1535,2910,2911],{},"GET /books"," 返回“图书列表”，",[1535,2914,2915],{},"GET /books/:id"," 返回“图书详情：id 值”。",[1965,2918,2919,2920,2922,2923,2926],{},"在 ",[1535,2921,1574],{}," 中把它挂载到 ",[1535,2924,2925],{},"/books"," 路径下。",[1570,2928,2930],{"className":1572,"code":2929,"filename":2907,"language":1575,"meta":1576,"style":1576},"// 请在这里编写代码\n",[1535,2931,2932],{"__ignoreMap":1576},[1580,2933,2934],{"class":1582,"line":1583},[1580,2935,2929],{"class":2404},[1570,2937,2939],{"className":1572,"code":2938,"filename":1574,"language":1575,"meta":1576,"style":1576},"import express from 'express';\n\nconst app = express();\n\n// 请在这里编写代码\n\napp.listen(3000);\n",[1535,2940,2941,2957,2961,2975,2979,2983,2987],{"__ignoreMap":1576},[1580,2942,2943,2945,2947,2949,2951,2953,2955],{"class":1582,"line":1583},[1580,2944,1587],{"class":1586},[1580,2946,1591],{"class":1590},[1580,2948,1594],{"class":1586},[1580,2950,1598],{"class":1597},[1580,2952,1602],{"class":1601},[1580,2954,1605],{"class":1597},[1580,2956,1608],{"class":1597},[1580,2958,2959],{"class":1582,"line":1611},[1580,2960,1615],{"emptyLinePlaceholder":1614},[1580,2962,2963,2965,2967,2969,2971,2973],{"class":1582,"line":1618},[1580,2964,1622],{"class":1621},[1580,2966,1625],{"class":1590},[1580,2968,1628],{"class":1597},[1580,2970,1632],{"class":1631},[1580,2972,1635],{"class":1590},[1580,2974,1608],{"class":1597},[1580,2976,2977],{"class":1582,"line":1640},[1580,2978,1615],{"emptyLinePlaceholder":1614},[1580,2980,2981],{"class":1582,"line":1645},[1580,2982,2929],{"class":2404},[1580,2984,2985],{"class":1582,"line":1690},[1580,2986,1615],{"emptyLinePlaceholder":1614},[1580,2988,2989,2991,2993,2995,2997,2999,3001],{"class":1582,"line":1715},[1580,2990,1648],{"class":1590},[1580,2992,1651],{"class":1597},[1580,2994,1947],{"class":1631},[1580,2996,1657],{"class":1590},[1580,2998,1953],{"class":1952},[1580,3000,1681],{"class":1590},[1580,3002,1608],{"class":1597},[1540,3004],{},[1531,3006,3007],{},"🎉 恭喜你已经掌握 Express 路由的常用写法！下一篇我们学习 Express 的灵魂：中间件机制。",[3009,3010,3011],"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 .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 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.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}",{"title":1576,"searchDepth":1611,"depth":1611,"links":3013},[3014,3015,3016,3017,3018,3019,3020,3021,3022,3023,3024],{"id":1528,"depth":1611,"text":1529},{"id":1544,"depth":1611,"text":1545},{"id":1564,"depth":1611,"text":1565},{"id":1999,"depth":1611,"text":2000},{"id":2149,"depth":1611,"text":2150},{"id":2307,"depth":1611,"text":2308},{"id":2337,"depth":1611,"text":2338},{"id":2713,"depth":1611,"text":2714},{"id":2755,"depth":1611,"text":2756},{"id":2811,"depth":1611,"text":2812},{"id":2894,"depth":1611,"text":2895},"掌握 Express 的请求方法路由、路径参数、查询参数，学会用 express.Router 模块化拆分路由。","md",null,{},{"title":1162},{"title":1521,"description":3025},"BQv6vJSN9d",[3033,3035],{"title":1156,"path":1157,"stem":1158,"description":3034,"children":-1},"了解 Express 是什么、为什么需要它，完成项目初始化并跑通第一个 Express 服务器。",{"title":1166,"path":1167,"stem":1168,"description":3036,"children":-1},"理解中间件的工作原理，掌握 app.use、内置中间件、自定义中间件和路由级中间件的用法。",1784715111628]