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(",[1571,1729,1731],{"class":1730},"sK9QF","ctx",[1571,1733,1734],{"class":1612},")",[1571,1736,1737],{"class":1653}," =>",[1571,1739,1740],{"class":1612}," {\n",[1571,1742,1744,1747,1749,1752,1755,1757,1760,1762],{"class":1573,"line":1743},8,[1571,1745,1746],{"class":1605},"    ctx",[1571,1748,1705],{"class":1612},[1571,1750,1751],{"class":1605},"body",[1571,1753,1754],{"class":1612}," =",[1571,1756,1613],{"class":1612},[1571,1758,1759],{"class":1581},"首页",[1571,1761,1619],{"class":1612},[1571,1763,1622],{"class":1612},[1571,1765,1767,1770,1772],{"class":1573,"line":1766},9,[1571,1768,1769],{"class":1612},"}",[1571,1771,1734],{"class":1605},[1571,1773,1622],{"class":1612},[1571,1775,1777],{"class":1573,"line":1776},10,[1571,1778,1647],{"emptyLinePlaceholder":1646},[1571,1780,1782,1784,1786,1788,1790,1792,1795,1797,1799,1801,1803,1805,1807,1809],{"class":1573,"line":1781},11,[1571,1783,1702],{"class":1605},[1571,1785,1705],{"class":1612},[1571,1787,1708],{"class":1666},[1571,1789,1711],{"class":1605},[1571,1791,1619],{"class":1612},[1571,1793,1794],{"class":1581},"/about",[1571,1796,1619],{"class":1612},[1571,1798,1721],{"class":1612},[1571,1800,1724],{"class":1653},[1571,1802,1727],{"class":1612},[1571,1804,1731],{"class":1730},[1571,1806,1734],{"class":1612},[1571,1808,1737],{"class":1653},[1571,1810,1740],{"class":1612},[1571,1812,1814,1816,1818,1820,1822,1824,1827,1829],{"class":1573,"line":1813},12,[1571,1815,1746],{"class":1605},[1571,1817,1705],{"class":1612},[1571,1819,1751],{"class":1605},[1571,1821,1754],{"class":1612},[1571,1823,1613],{"class":1612},[1571,1825,1826],{"class":1581},"关于页面",[1571,1828,1619],{"class":1612},[1571,1830,1622],{"class":1612},[1571,1832,1834,1836,1838],{"class":1573,"line":1833},13,[1571,1835,1769],{"class":1612},[1571,1837,1734],{"class":1605},[1571,1839,1622],{"class":1612},[1571,1841,1843],{"class":1573,"line":1842},14,[1571,1844,1647],{"emptyLinePlaceholder":1646},[1571,1846,1848],{"class":1573,"line":1847},15,[1571,1849,1851],{"class":1850},"syuKq","// 把路由注册到应用上\n",[1571,1853,1855,1858,1860,1863,1866,1868,1871,1874],{"class":1573,"line":1854},16,[1571,1856,1857],{"class":1605},"app",[1571,1859,1705],{"class":1612},[1571,1861,1862],{"class":1666},"use",[1571,1864,1865],{"class":1605},"(router",[1571,1867,1705],{"class":1612},[1571,1869,1870],{"class":1666},"routes",[1571,1872,1873],{"class":1605},"())",[1571,1875,1622],{"class":1612},[1571,1877,1879,1881,1883,1885,1887,1889,1892,1894],{"class":1573,"line":1878},17,[1571,1880,1857],{"class":1605},[1571,1882,1705],{"class":1612},[1571,1884,1862],{"class":1666},[1571,1886,1865],{"class":1605},[1571,1888,1705],{"class":1612},[1571,1890,1891],{"class":1666},"allowedMethods",[1571,1893,1873],{"class":1605},[1571,1895,1622],{"class":1612},[1571,1897,1899],{"class":1573,"line":1898},18,[1571,1900,1647],{"emptyLinePlaceholder":1646},[1571,1902,1904,1906,1908,1911,1913,1917,1919],{"class":1573,"line":1903},19,[1571,1905,1857],{"class":1605},[1571,1907,1705],{"class":1612},[1571,1909,1910],{"class":1666},"listen",[1571,1912,1711],{"class":1605},[1571,1914,1916],{"class":1915},"smPcV","3000",[1571,1918,1734],{"class":1605},[1571,1920,1622],{"class":1612},[1530,1922,1923,1924,1926,1927,1929,1930,1933,1934,1937,1938,1941],{},"现在访问 ",[1534,1925,1716],{}," 和 ",[1534,1928,1794],{}," 会返回不同内容，访问其他地址会得到 404。",[1534,1931,1932],{},"router.get()"," 的写法和 Express 路由几乎一样，唯一的区别是回调参数从 ",[1534,1935,1936],{},"(req, res)"," 换成了 ",[1534,1939,1940],{},"(ctx)","。",[1543,1943],{},[1525,1945,1947],{"id":1946},"常用请求方法","🛠 常用请求方法",[1530,1949,1950,1951,1953],{},"RESTful 风格的接口需要区分请求方法，",[1534,1952,1554],{}," 都支持：",[1562,1955,1957],{"className":1591,"code":1956,"filename":1593,"language":1594,"meta":1567,"style":1567},"router.get('/users', async (ctx) => {\n    ctx.body = '获取用户列表';\n});\n\nrouter.post('/users', async (ctx) => {\n    ctx.body = '创建用户';\n});\n\nrouter.put('/users/1', async (ctx) => {\n    ctx.body = '更新用户';\n});\n\nrouter.delete('/users/1', async (ctx) => {\n    ctx.body = '删除用户';\n});\n",[1534,1958,1959,1990,2009,2017,2021,2052,2071,2079,2083,2115,2134,2142,2146,2177,2196],{"__ignoreMap":1567},[1571,1960,1961,1963,1965,1967,1969,1971,1974,1976,1978,1980,1982,1984,1986,1988],{"class":1573,"line":1574},[1571,1962,1702],{"class":1605},[1571,1964,1705],{"class":1612},[1571,1966,1708],{"class":1666},[1571,1968,1711],{"class":1605},[1571,1970,1619],{"class":1612},[1571,1972,1973],{"class":1581},"/users",[1571,1975,1619],{"class":1612},[1571,1977,1721],{"class":1612},[1571,1979,1724],{"class":1653},[1571,1981,1727],{"class":1612},[1571,1983,1731],{"class":1730},[1571,1985,1734],{"class":1612},[1571,1987,1737],{"class":1653},[1571,1989,1740],{"class":1612},[1571,1991,1992,1994,1996,1998,2000,2002,2005,2007],{"class":1573,"line":1625},[1571,1993,1746],{"class":1605},[1571,1995,1705],{"class":1612},[1571,1997,1751],{"class":1605},[1571,1999,1754],{"class":1612},[1571,2001,1613],{"class":1612},[1571,2003,2004],{"class":1581},"获取用户列表",[1571,2006,1619],{"class":1612},[1571,2008,1622],{"class":1612},[1571,2010,2011,2013,2015],{"class":1573,"line":1643},[1571,2012,1769],{"class":1612},[1571,2014,1734],{"class":1605},[1571,2016,1622],{"class":1612},[1571,2018,2019],{"class":1573,"line":1650},[1571,2020,1647],{"emptyLinePlaceholder":1646},[1571,2022,2023,2025,2027,2030,2032,2034,2036,2038,2040,2042,2044,2046,2048,2050],{"class":1573,"line":1675},[1571,2024,1702],{"class":1605},[1571,2026,1705],{"class":1612},[1571,2028,2029],{"class":1666},"post",[1571,2031,1711],{"class":1605},[1571,2033,1619],{"class":1612},[1571,2035,1973],{"class":1581},[1571,2037,1619],{"class":1612},[1571,2039,1721],{"class":1612},[1571,2041,1724],{"class":1653},[1571,2043,1727],{"class":1612},[1571,2045,1731],{"class":1730},[1571,2047,1734],{"class":1612},[1571,2049,1737],{"class":1653},[1571,2051,1740],{"class":1612},[1571,2053,2054,2056,2058,2060,2062,2064,2067,2069],{"class":1573,"line":1694},[1571,2055,1746],{"class":1605},[1571,2057,1705],{"class":1612},[1571,2059,1751],{"class":1605},[1571,2061,1754],{"class":1612},[1571,2063,1613],{"class":1612},[1571,2065,2066],{"class":1581},"创建用户",[1571,2068,1619],{"class":1612},[1571,2070,1622],{"class":1612},[1571,2072,2073,2075,2077],{"class":1573,"line":1699},[1571,2074,1769],{"class":1612},[1571,2076,1734],{"class":1605},[1571,2078,1622],{"class":1612},[1571,2080,2081],{"class":1573,"line":1743},[1571,2082,1647],{"emptyLinePlaceholder":1646},[1571,2084,2085,2087,2089,2092,2094,2096,2099,2101,2103,2105,2107,2109,2111,2113],{"class":1573,"line":1766},[1571,2086,1702],{"class":1605},[1571,2088,1705],{"class":1612},[1571,2090,2091],{"class":1666},"put",[1571,2093,1711],{"class":1605},[1571,2095,1619],{"class":1612},[1571,2097,2098],{"class":1581},"/users/1",[1571,2100,1619],{"class":1612},[1571,2102,1721],{"class":1612},[1571,2104,1724],{"class":1653},[1571,2106,1727],{"class":1612},[1571,2108,1731],{"class":1730},[1571,2110,1734],{"class":1612},[1571,2112,1737],{"class":1653},[1571,2114,1740],{"class":1612},[1571,2116,2117,2119,2121,2123,2125,2127,2130,2132],{"class":1573,"line":1776},[1571,2118,1746],{"class":1605},[1571,2120,1705],{"class":1612},[1571,2122,1751],{"class":1605},[1571,2124,1754],{"class":1612},[1571,2126,1613],{"class":1612},[1571,2128,2129],{"class":1581},"更新用户",[1571,2131,1619],{"class":1612},[1571,2133,1622],{"class":1612},[1571,2135,2136,2138,2140],{"class":1573,"line":1781},[1571,2137,1769],{"class":1612},[1571,2139,1734],{"class":1605},[1571,2141,1622],{"class":1612},[1571,2143,2144],{"class":1573,"line":1813},[1571,2145,1647],{"emptyLinePlaceholder":1646},[1571,2147,2148,2150,2152,2155,2157,2159,2161,2163,2165,2167,2169,2171,2173,2175],{"class":1573,"line":1833},[1571,2149,1702],{"class":1605},[1571,2151,1705],{"class":1612},[1571,2153,2154],{"class":1666},"delete",[1571,2156,1711],{"class":1605},[1571,2158,1619],{"class":1612},[1571,2160,2098],{"class":1581},[1571,2162,1619],{"class":1612},[1571,2164,1721],{"class":1612},[1571,2166,1724],{"class":1653},[1571,2168,1727],{"class":1612},[1571,2170,1731],{"class":1730},[1571,2172,1734],{"class":1612},[1571,2174,1737],{"class":1653},[1571,2176,1740],{"class":1612},[1571,2178,2179,2181,2183,2185,2187,2189,2192,2194],{"class":1573,"line":1842},[1571,2180,1746],{"class":1605},[1571,2182,1705],{"class":1612},[1571,2184,1751],{"class":1605},[1571,2186,1754],{"class":1612},[1571,2188,1613],{"class":1612},[1571,2190,2191],{"class":1581},"删除用户",[1571,2193,1619],{"class":1612},[1571,2195,1622],{"class":1612},[1571,2197,2198,2200,2202],{"class":1573,"line":1847},[1571,2199,1769],{"class":1612},[1571,2201,1734],{"class":1605},[1571,2203,1622],{"class":1612},[1530,2205,2206],{},"同一个路径配上不同方法，就是 RESTful 接口的经典形态。GET 和 DELETE 可以在浏览器或地址栏测试，POST 和 PUT 建议用 Apifox、Postman 这类接口工具来发请求。",[2208,2209,2210],"warning",{},[1530,2211,2212],{},"接口调试工具的页面会不定期更新，界面入口可能与文中描述略有不同。核心思路不变：选择请求方法、填写地址、查看响应，操作时以工具的最新页面为准。",[1543,2214],{},[1525,2216,2218],{"id":2217},"路由参数与查询参数","🧱 路由参数与查询参数",[1530,2220,2221,2224,2225,2228,2229,2232],{},[1557,2222,2223],{},"路由参数","是路径里的动态部分，用 ",[1534,2226,2227],{},":参数名"," 定义，通过 ",[1534,2230,2231],{},"ctx.params"," 获取：",[1562,2234,2236],{"className":1591,"code":2235,"filename":1593,"language":1594,"meta":1567,"style":1567},"router.get('/users/:id', async (ctx) => {\n    const id = ctx.params.id; // 访问 /users/42 时，id 是 '42'\n    ctx.body = { id, name: '小明' };\n});\n",[1534,2237,2238,2269,2298,2332],{"__ignoreMap":1567},[1571,2239,2240,2242,2244,2246,2248,2250,2253,2255,2257,2259,2261,2263,2265,2267],{"class":1573,"line":1574},[1571,2241,1702],{"class":1605},[1571,2243,1705],{"class":1612},[1571,2245,1708],{"class":1666},[1571,2247,1711],{"class":1605},[1571,2249,1619],{"class":1612},[1571,2251,2252],{"class":1581},"/users/:id",[1571,2254,1619],{"class":1612},[1571,2256,1721],{"class":1612},[1571,2258,1724],{"class":1653},[1571,2260,1727],{"class":1612},[1571,2262,1731],{"class":1730},[1571,2264,1734],{"class":1612},[1571,2266,1737],{"class":1653},[1571,2268,1740],{"class":1612},[1571,2270,2271,2274,2277,2279,2282,2284,2287,2289,2292,2295],{"class":1573,"line":1625},[1571,2272,2273],{"class":1653},"    const",[1571,2275,2276],{"class":1605}," id",[1571,2278,1754],{"class":1612},[1571,2280,2281],{"class":1605}," ctx",[1571,2283,1705],{"class":1612},[1571,2285,2286],{"class":1605},"params",[1571,2288,1705],{"class":1612},[1571,2290,2291],{"class":1605},"id",[1571,2293,2294],{"class":1612},";",[1571,2296,2297],{"class":1850}," // 访问 /users/42 时，id 是 '42'\n",[1571,2299,2300,2302,2304,2306,2308,2311,2313,2315,2319,2322,2324,2327,2329],{"class":1573,"line":1643},[1571,2301,1746],{"class":1605},[1571,2303,1705],{"class":1612},[1571,2305,1751],{"class":1605},[1571,2307,1754],{"class":1612},[1571,2309,2310],{"class":1612}," {",[1571,2312,2276],{"class":1605},[1571,2314,1721],{"class":1612},[1571,2316,2318],{"class":2317},"sd2Uz"," name",[1571,2320,2321],{"class":1612},":",[1571,2323,1613],{"class":1612},[1571,2325,2326],{"class":1581},"小明",[1571,2328,1619],{"class":1612},[1571,2330,2331],{"class":1612}," };\n",[1571,2333,2334,2336,2338],{"class":1573,"line":1650},[1571,2335,1769],{"class":1612},[1571,2337,1734],{"class":1605},[1571,2339,1622],{"class":1612},[1530,2341,2342,2345,2346,2349,2350,2353],{},[1557,2343,2344],{},"查询参数","是 ",[1534,2347,2348],{},"?"," 后面的部分，通过 ",[1534,2351,2352],{},"ctx.query"," 获取（上一篇学过）：",[1562,2355,2357],{"className":1591,"code":2356,"filename":1593,"language":1594,"meta":1567,"style":1567},"router.get('/users', async (ctx) => {\n    // 访问 /users?page=2&size=10\n    const { page, size } = ctx.query;\n    ctx.body = { page, size };\n});\n",[1534,2358,2359,2389,2394,2422,2442],{"__ignoreMap":1567},[1571,2360,2361,2363,2365,2367,2369,2371,2373,2375,2377,2379,2381,2383,2385,2387],{"class":1573,"line":1574},[1571,2362,1702],{"class":1605},[1571,2364,1705],{"class":1612},[1571,2366,1708],{"class":1666},[1571,2368,1711],{"class":1605},[1571,2370,1619],{"class":1612},[1571,2372,1973],{"class":1581},[1571,2374,1619],{"class":1612},[1571,2376,1721],{"class":1612},[1571,2378,1724],{"class":1653},[1571,2380,1727],{"class":1612},[1571,2382,1731],{"class":1730},[1571,2384,1734],{"class":1612},[1571,2386,1737],{"class":1653},[1571,2388,1740],{"class":1612},[1571,2390,2391],{"class":1573,"line":1625},[1571,2392,2393],{"class":1850},"    // 访问 /users?page=2&size=10\n",[1571,2395,2396,2398,2400,2403,2405,2408,2411,2413,2415,2417,2420],{"class":1573,"line":1643},[1571,2397,2273],{"class":1653},[1571,2399,2310],{"class":1612},[1571,2401,2402],{"class":1605}," page",[1571,2404,1721],{"class":1612},[1571,2406,2407],{"class":1605}," size",[1571,2409,2410],{"class":1612}," }",[1571,2412,1754],{"class":1612},[1571,2414,2281],{"class":1605},[1571,2416,1705],{"class":1612},[1571,2418,2419],{"class":1605},"query",[1571,2421,1622],{"class":1612},[1571,2423,2424,2426,2428,2430,2432,2434,2436,2438,2440],{"class":1573,"line":1650},[1571,2425,1746],{"class":1605},[1571,2427,1705],{"class":1612},[1571,2429,1751],{"class":1605},[1571,2431,1754],{"class":1612},[1571,2433,2310],{"class":1612},[1571,2435,2402],{"class":1605},[1571,2437,1721],{"class":1612},[1571,2439,2407],{"class":1605},[1571,2441,2331],{"class":1612},[1571,2443,2444,2446,2448],{"class":1573,"line":1675},[1571,2445,1769],{"class":1612},[1571,2447,1734],{"class":1605},[1571,2449,1622],{"class":1612},[2451,2452,2453],"tip",{},[1530,2454,2455,2456,2458,2459,2461,2462,2464,2465,2468],{},"两个参数的名字容易混，记一个区分法：",[1534,2457,2231],{}," 管路径里的（",[1534,2460,2252],{},"），",[1534,2463,2352],{}," 管问号后的（",[1534,2466,2467],{},"?page=2","）。两者的值都是字符串，需要数字时记得转换。",[1543,2470],{},[1525,2472,2474],{"id":2473},"allowedmethods-有什么用","💡 allowedMethods 有什么用",[1530,2476,2477,2480],{},[1534,2478,2479],{},"app.use(router.allowedMethods())"," 这行代码看着不起眼，作用有两个：",[2482,2483,2484,2501],"ul",{},[2485,2486,2487,2490,2491,2493,2494,2496,2497,2500],"li",{},[1557,2488,2489],{},"404 语义更准","：路径存在但方法不对时（比如只定义了 ",[1534,2492,1536],{},"，却发来了 ",[1534,2495,1540],{},"），返回 ",[1557,2498,2499],{},"405 Method Not Allowed"," 而不是 404，告诉客户端“地址有，但你方法用错了”。",[2485,2502,2503,2506],{},[1557,2504,2505],{},"自动响应 OPTIONS 请求","：浏览器跨域预检时发来 OPTIONS 请求，它会自动回复该路径支持哪些方法。",[1530,2508,2509],{},"简单说，加上它，你的接口对“错误请求”的反馈会更规范，建议每次都带上。",[1543,2511],{},[1525,2513,2515],{"id":2514},"router-模块化拆分","🧰 Router 模块化拆分",[1530,2517,2518,2519,2521],{},"所有路由都堆在 ",[1534,2520,1593],{}," 里，项目一大就没法维护了。实际开发会把不同模块的路由拆到独立文件：",[1562,2523,2526],{"className":1591,"code":2524,"filename":2525,"language":1594,"meta":1567,"style":1567},"import Router from '@koa/router';\n\nconst router = new Router({\n    prefix: '/users', // 路由前缀，下面的路径都会自动加上 /users\n});\n\nrouter.get('/', async (ctx) => {\n    ctx.body = '用户列表';\n});\n\nrouter.get('/:id', async (ctx) => {\n    ctx.body = `用户详情：${ctx.params.id}`;\n});\n\nexport default router;\n","routes/users.js",[1534,2527,2528,2544,2548,2565,2583,2591,2595,2625,2644,2652,2656,2687,2721,2729,2733],{"__ignoreMap":1567},[1571,2529,2530,2532,2534,2536,2538,2540,2542],{"class":1573,"line":1574},[1571,2531,1602],{"class":1601},[1571,2533,1630],{"class":1605},[1571,2535,1609],{"class":1601},[1571,2537,1613],{"class":1612},[1571,2539,1554],{"class":1581},[1571,2541,1619],{"class":1612},[1571,2543,1622],{"class":1612},[1571,2545,2546],{"class":1573,"line":1625},[1571,2547,1647],{"emptyLinePlaceholder":1646},[1571,2549,2550,2552,2554,2556,2558,2560,2562],{"class":1573,"line":1643},[1571,2551,1654],{"class":1653},[1571,2553,1680],{"class":1605},[1571,2555,1660],{"class":1612},[1571,2557,1663],{"class":1612},[1571,2559,1687],{"class":1666},[1571,2561,1711],{"class":1605},[1571,2563,2564],{"class":1612},"{\n",[1571,2566,2567,2570,2572,2574,2576,2578,2580],{"class":1573,"line":1650},[1571,2568,2569],{"class":2317},"    prefix",[1571,2571,2321],{"class":1612},[1571,2573,1613],{"class":1612},[1571,2575,1973],{"class":1581},[1571,2577,1619],{"class":1612},[1571,2579,1721],{"class":1612},[1571,2581,2582],{"class":1850}," // 路由前缀，下面的路径都会自动加上 /users\n",[1571,2584,2585,2587,2589],{"class":1573,"line":1675},[1571,2586,1769],{"class":1612},[1571,2588,1734],{"class":1605},[1571,2590,1622],{"class":1612},[1571,2592,2593],{"class":1573,"line":1694},[1571,2594,1647],{"emptyLinePlaceholder":1646},[1571,2596,2597,2599,2601,2603,2605,2607,2609,2611,2613,2615,2617,2619,2621,2623],{"class":1573,"line":1699},[1571,2598,1702],{"class":1605},[1571,2600,1705],{"class":1612},[1571,2602,1708],{"class":1666},[1571,2604,1711],{"class":1605},[1571,2606,1619],{"class":1612},[1571,2608,1716],{"class":1581},[1571,2610,1619],{"class":1612},[1571,2612,1721],{"class":1612},[1571,2614,1724],{"class":1653},[1571,2616,1727],{"class":1612},[1571,2618,1731],{"class":1730},[1571,2620,1734],{"class":1612},[1571,2622,1737],{"class":1653},[1571,2624,1740],{"class":1612},[1571,2626,2627,2629,2631,2633,2635,2637,2640,2642],{"class":1573,"line":1743},[1571,2628,1746],{"class":1605},[1571,2630,1705],{"class":1612},[1571,2632,1751],{"class":1605},[1571,2634,1754],{"class":1612},[1571,2636,1613],{"class":1612},[1571,2638,2639],{"class":1581},"用户列表",[1571,2641,1619],{"class":1612},[1571,2643,1622],{"class":1612},[1571,2645,2646,2648,2650],{"class":1573,"line":1766},[1571,2647,1769],{"class":1612},[1571,2649,1734],{"class":1605},[1571,2651,1622],{"class":1612},[1571,2653,2654],{"class":1573,"line":1776},[1571,2655,1647],{"emptyLinePlaceholder":1646},[1571,2657,2658,2660,2662,2664,2666,2668,2671,2673,2675,2677,2679,2681,2683,2685],{"class":1573,"line":1781},[1571,2659,1702],{"class":1605},[1571,2661,1705],{"class":1612},[1571,2663,1708],{"class":1666},[1571,2665,1711],{"class":1605},[1571,2667,1619],{"class":1612},[1571,2669,2670],{"class":1581},"/:id",[1571,2672,1619],{"class":1612},[1571,2674,1721],{"class":1612},[1571,2676,1724],{"class":1653},[1571,2678,1727],{"class":1612},[1571,2680,1731],{"class":1730},[1571,2682,1734],{"class":1612},[1571,2684,1737],{"class":1653},[1571,2686,1740],{"class":1612},[1571,2688,2689,2691,2693,2695,2697,2700,2703,2706,2708,2710,2712,2714,2716,2719],{"class":1573,"line":1813},[1571,2690,1746],{"class":1605},[1571,2692,1705],{"class":1612},[1571,2694,1751],{"class":1605},[1571,2696,1754],{"class":1612},[1571,2698,2699],{"class":1612}," `",[1571,2701,2702],{"class":1581},"用户详情：",[1571,2704,2705],{"class":1612},"${",[1571,2707,1731],{"class":1605},[1571,2709,1705],{"class":1612},[1571,2711,2286],{"class":1605},[1571,2713,1705],{"class":1612},[1571,2715,2291],{"class":1605},[1571,2717,2718],{"class":1612},"}`",[1571,2720,1622],{"class":1612},[1571,2722,2723,2725,2727],{"class":1573,"line":1833},[1571,2724,1769],{"class":1612},[1571,2726,1734],{"class":1605},[1571,2728,1622],{"class":1612},[1571,2730,2731],{"class":1573,"line":1842},[1571,2732,1647],{"emptyLinePlaceholder":1646},[1571,2734,2735,2738,2741,2744],{"class":1573,"line":1847},[1571,2736,2737],{"class":1601},"export",[1571,2739,2740],{"class":1601}," default",[1571,2742,2743],{"class":1605}," router",[1571,2745,1622],{"class":1612},[1530,2747,2748],{},"在主文件里引入并注册：",[1562,2750,2752],{"className":1591,"code":2751,"filename":1593,"language":1594,"meta":1567,"style":1567},"import Koa from 'koa';\nimport usersRouter from './routes/users.js';\n\nconst app = new Koa();\n\napp.use(usersRouter.routes());\napp.use(usersRouter.allowedMethods());\n\napp.listen(3000);\n",[1534,2753,2754,2770,2788,2792,2808,2812,2831,2849,2853],{"__ignoreMap":1567},[1571,2755,2756,2758,2760,2762,2764,2766,2768],{"class":1573,"line":1574},[1571,2757,1602],{"class":1601},[1571,2759,1606],{"class":1605},[1571,2761,1609],{"class":1601},[1571,2763,1613],{"class":1612},[1571,2765,1616],{"class":1581},[1571,2767,1619],{"class":1612},[1571,2769,1622],{"class":1612},[1571,2771,2772,2774,2777,2779,2781,2784,2786],{"class":1573,"line":1625},[1571,2773,1602],{"class":1601},[1571,2775,2776],{"class":1605}," usersRouter ",[1571,2778,1609],{"class":1601},[1571,2780,1613],{"class":1612},[1571,2782,2783],{"class":1581},"./routes/users.js",[1571,2785,1619],{"class":1612},[1571,2787,1622],{"class":1612},[1571,2789,2790],{"class":1573,"line":1643},[1571,2791,1647],{"emptyLinePlaceholder":1646},[1571,2793,2794,2796,2798,2800,2802,2804,2806],{"class":1573,"line":1650},[1571,2795,1654],{"class":1653},[1571,2797,1657],{"class":1605},[1571,2799,1660],{"class":1612},[1571,2801,1663],{"class":1612},[1571,2803,1667],{"class":1666},[1571,2805,1670],{"class":1605},[1571,2807,1622],{"class":1612},[1571,2809,2810],{"class":1573,"line":1675},[1571,2811,1647],{"emptyLinePlaceholder":1646},[1571,2813,2814,2816,2818,2820,2823,2825,2827,2829],{"class":1573,"line":1694},[1571,2815,1857],{"class":1605},[1571,2817,1705],{"class":1612},[1571,2819,1862],{"class":1666},[1571,2821,2822],{"class":1605},"(usersRouter",[1571,2824,1705],{"class":1612},[1571,2826,1870],{"class":1666},[1571,2828,1873],{"class":1605},[1571,2830,1622],{"class":1612},[1571,2832,2833,2835,2837,2839,2841,2843,2845,2847],{"class":1573,"line":1699},[1571,2834,1857],{"class":1605},[1571,2836,1705],{"class":1612},[1571,2838,1862],{"class":1666},[1571,2840,2822],{"class":1605},[1571,2842,1705],{"class":1612},[1571,2844,1891],{"class":1666},[1571,2846,1873],{"class":1605},[1571,2848,1622],{"class":1612},[1571,2850,2851],{"class":1573,"line":1743},[1571,2852,1647],{"emptyLinePlaceholder":1646},[1571,2854,2855,2857,2859,2861,2863,2865,2867],{"class":1573,"line":1766},[1571,2856,1857],{"class":1605},[1571,2858,1705],{"class":1612},[1571,2860,1910],{"class":1666},[1571,2862,1711],{"class":1605},[1571,2864,1916],{"class":1915},[1571,2866,1734],{"class":1605},[1571,2868,1622],{"class":1612},[1530,2870,2871,2872,2875,2876,2879,2880,2882,2883,2886,2887,2889,2890,2893],{},"注意 ",[1534,2873,2874],{},"prefix: '/users'"," 配合 ",[1534,2877,2878],{},"router.get('/')","，最终匹配的路径是 ",[1534,2881,1973],{},"；",[1534,2884,2885],{},"router.get('/:id')"," 匹配的是 ",[1534,2888,2098],{}," 这样的地址。每个业务模块一个路由文件，结构清晰，和 Express 里 ",[1534,2891,2892],{},"express.Router()"," 的拆分思路完全一致。",[1543,2895],{},[1525,2897,2899],{"id":2898},"小节总结","🧾 小节总结",[2482,2901,2902,2911,2921,2936,2942],{},[2485,2903,2904,2905,2907,2908,2910],{},"Koa 不带路由，需安装官方库 ",[1534,2906,1554],{},"，创建实例后用 ",[1534,2909,1932],{}," 等方法定义路由。",[2485,2912,2913,2914,2917,2918,1941],{},"路由通过 ",[1534,2915,2916],{},"app.use(router.routes())"," 注册，建议同时加上 ",[1534,2919,2920],{},"router.allowedMethods()",[2485,2922,2923,2924,2927,2928,2930,2931,2927,2933,2935],{},"路由参数 ",[1534,2925,2926],{},":id"," 用 ",[1534,2929,2231],{}," 取，查询参数 ",[1534,2932,2467],{},[1534,2934,2352],{}," 取，值都是字符串。",[2485,2937,2938,2941],{},[1534,2939,2940],{},"allowedMethods()"," 让方法不匹配时返回 405，并自动处理 OPTIONS 请求。",[2485,2943,2944,2945,2948],{},"用 ",[1534,2946,2947],{},"new Router({ prefix })"," 加分文件导出，实现路由模块化拆分。",[1543,2950],{},[1525,2952,2954],{"id":2953},"知识问答","❓ 知识问答",[1530,2956,2957],{},[1557,2958,2959],{},"Q1：路由定义的先后顺序有影响吗？",[1530,2961,2962,2963,2965,2966,2969,2970,2972,2973,2976,2977,2979],{},"有。",[1534,2964,1554],{}," 按注册顺序匹配，先匹配到的先生效。比如 ",[1534,2967,2968],{},"/users/new"," 要定义在 ",[1534,2971,2252],{}," 前面，否则 ",[1534,2974,2975],{},"new"," 会被当成 ",[1534,2978,2291],{}," 参数匹配走。",[1530,2981,2982],{},[1557,2983,2984],{},"Q2：一个路由能同时处理多种方法吗？",[1530,2986,2987],{},"可以，但一般不这么写。按 RESTful 规范，每个方法各定义一条路由，逻辑分开更清晰。",[1530,2989,2990],{},[1557,2991,2992],{},"Q3：ctx.params.id 是数字吗？",[1530,2994,2995,2996,2999,3000,3003],{},"不是，是字符串。路径本来就是文本，取到后需要数字时用 ",[1534,2997,2998],{},"Number(ctx.params.id)"," 转换，记得处理 ",[1534,3001,3002],{},"NaN"," 的情况。",[1530,3005,3006],{},[1557,3007,3008],{},"Q4：忘记注册 allowedMethods 会怎样？",[1530,3010,3011],{},"功能上接口照常工作，只是方法不匹配时统一返回 404 而不是 405，也无法自动响应 OPTIONS 请求。建议养成两个都注册的习惯。",[1543,3013],{},[1525,3015,3017],{"id":3016},"小练习","🧪 小练习",[3019,3020,3021],"ol",{},[2485,3022,3023,3024,3027,3028,3031,3032,3035,3036,3038],{},"新建路由文件 ",[1534,3025,3026],{},"routes/articles.js","，定义两个接口：",[1534,3029,3030],{},"GET /articles"," 返回文章列表（假数据即可），",[1534,3033,3034],{},"GET /articles/:id"," 返回指定 id 的文章，并在 ",[1534,3037,1593],{}," 中注册。",[1562,3040,3042],{"className":1591,"code":3041,"filename":3026,"language":1594,"meta":1567,"style":1567},"import Router from '@koa/router';\n\nconst router = new Router({ prefix: '/articles' });\n\n// 请在这里编写代码\n\nexport default router;\n",[1534,3043,3044,3060,3064,3099,3103,3108,3112],{"__ignoreMap":1567},[1571,3045,3046,3048,3050,3052,3054,3056,3058],{"class":1573,"line":1574},[1571,3047,1602],{"class":1601},[1571,3049,1630],{"class":1605},[1571,3051,1609],{"class":1601},[1571,3053,1613],{"class":1612},[1571,3055,1554],{"class":1581},[1571,3057,1619],{"class":1612},[1571,3059,1622],{"class":1612},[1571,3061,3062],{"class":1573,"line":1625},[1571,3063,1647],{"emptyLinePlaceholder":1646},[1571,3065,3066,3068,3070,3072,3074,3076,3078,3081,3084,3086,3088,3091,3093,3095,3097],{"class":1573,"line":1643},[1571,3067,1654],{"class":1653},[1571,3069,1680],{"class":1605},[1571,3071,1660],{"class":1612},[1571,3073,1663],{"class":1612},[1571,3075,1687],{"class":1666},[1571,3077,1711],{"class":1605},[1571,3079,3080],{"class":1612},"{",[1571,3082,3083],{"class":2317}," prefix",[1571,3085,2321],{"class":1612},[1571,3087,1613],{"class":1612},[1571,3089,3090],{"class":1581},"/articles",[1571,3092,1619],{"class":1612},[1571,3094,2410],{"class":1612},[1571,3096,1734],{"class":1605},[1571,3098,1622],{"class":1612},[1571,3100,3101],{"class":1573,"line":1650},[1571,3102,1647],{"emptyLinePlaceholder":1646},[1571,3104,3105],{"class":1573,"line":1675},[1571,3106,3107],{"class":1850},"// 请在这里编写代码\n",[1571,3109,3110],{"class":1573,"line":1694},[1571,3111,1647],{"emptyLinePlaceholder":1646},[1571,3113,3114,3116,3118,3120],{"class":1573,"line":1699},[1571,3115,2737],{"class":1601},[1571,3117,2740],{"class":1601},[1571,3119,2743],{"class":1605},[1571,3121,1622],{"class":1612},[3019,3123,3124],{"start":1625},[2485,3125,3126,3127,1926,3129,3132],{},"分别用浏览器访问 ",[1534,3128,3090],{},[1534,3130,3131],{},"/articles/1","，确认两个路由都能正确响应。",[1543,3134],{},[1530,3136,3137],{},"🎉 恭喜你已经给 Koa 装上了路由！下一篇我们处理两个实际问题：解析前端发来的请求体数据，以及优雅地处理接口错误。",[3139,3140,3141],"style",{},"html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}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: 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.s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}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 .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 .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}",{"title":1567,"searchDepth":1625,"depth":1625,"links":3143},[3144,3145,3146,3147,3148,3149,3150,3151,3152],{"id":1527,"depth":1625,"text":1528},{"id":1547,"depth":1625,"text":1548},{"id":1946,"depth":1625,"text":1947},{"id":2217,"depth":1625,"text":2218},{"id":2473,"depth":1625,"text":2474},{"id":2514,"depth":1625,"text":2515},{"id":2898,"depth":1625,"text":2899},{"id":2953,"depth":1625,"text":2954},{"id":3016,"depth":1625,"text":3017},"学会使用 @koa/router 定义路由、获取路由参数与查询参数，掌握路由模块化拆分的方法。","md",null,{},{"title":1162},{"title":1162,"description":3153},"HoNyYb5J8h",[3161,3163],{"title":1198,"path":1199,"stem":1200,"description":3162,"children":-1},"深入理解 Koa 中间件的执行机制，掌握洋葱模型的执行顺序，学会编写实用的中间件。",{"title":1205,"path":1206,"stem":1207,"description":3164,"children":-1},"学会用 koa-bodyparser 解析请求体，掌握统一错误处理、ctx.throw 与 404 自定义的写法。",1784715110396]