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兜底：放在所有路由之后，前面都没命中就会走到这里\n",[1577,1734,1736,1738,1740,1743,1745,1747,1749,1751,1753,1755,1757],{"class":1579,"line":1735},10,[1577,1737,1645],{"class":1587},[1577,1739,1648],{"class":1594},[1577,1741,1742],{"class":1628},"use",[1577,1744,1654],{"class":1587},[1577,1746,1654],{"class":1594},[1577,1748,1671],{"class":1670},[1577,1750,1664],{"class":1594},[1577,1752,1676],{"class":1670},[1577,1754,1679],{"class":1594},[1577,1756,1682],{"class":1618},[1577,1758,1685],{"class":1594},[1577,1760,1762,1764,1766,1769,1771,1775,1777,1779,1782,1784,1787,1790,1793,1796,1798,1801,1803,1805,1808,1810,1813,1815],{"class":1579,"line":1761},11,[1577,1763,1691],{"class":1587},[1577,1765,1648],{"class":1594},[1577,1767,1768],{"class":1628},"status",[1577,1770,1654],{"class":1699},[1577,1772,1774],{"class":1773},"smPcV","404",[1577,1776,1679],{"class":1699},[1577,1778,1648],{"class":1594},[1577,1780,1781],{"class":1628},"json",[1577,1783,1654],{"class":1699},[1577,1785,1786],{"class":1594},"{",[1577,1788,1789],{"class":1699}," code",[1577,1791,1792],{"class":1594},":",[1577,1794,1795],{"class":1773}," 404",[1577,1797,1664],{"class":1594},[1577,1799,1800],{"class":1699}," message",[1577,1802,1792],{"class":1594},[1577,1804,1595],{"class":1594},[1577,1806,1807],{"class":1598},"接口不存在",[1577,1809,1602],{"class":1594},[1577,1811,1812],{"class":1594}," }",[1577,1814,1679],{"class":1699},[1577,1816,1605],{"class":1594},[1577,1818,1820,1822,1824],{"class":1579,"line":1819},12,[1577,1821,1716],{"class":1594},[1577,1823,1679],{"class":1587},[1577,1825,1605],{"class":1594},[1577,1827,1829],{"class":1579,"line":1828},13,[1577,1830,1612],{"emptyLinePlaceholder":1611},[1577,1832,1834,1836,1838,1841,1843,1846,1848],{"class":1579,"line":1833},14,[1577,1835,1645],{"class":1587},[1577,1837,1648],{"class":1594},[1577,1839,1840],{"class":1628},"listen",[1577,1842,1654],{"class":1587},[1577,1844,1845],{"class":1773},"3000",[1577,1847,1679],{"class":1587},[1577,1849,1605],{"class":1594},[1531,1851,1852,1853,1856],{},"访问 ",[1574,1854,1855],{},"/abc"," 这样的任意地址，就会收到 JSON 格式的 404 响应。",[1858,1859,1860],"tip",{},[1531,1861,1862],{},"404 中间件本质上是利用了中间件按顺序执行的机制：前面的路由都没响应，请求自然流到了最后。所以它的位置必须写在所有路由之后。",[1535,1864],{},[1526,1866,1868],{"id":1867},"错误处理中间件四个参数","🧱 错误处理中间件：四个参数",[1531,1870,1871,1872,1875,1876,1879],{},"普通中间件是三个参数，",[1548,1873,1874],{},"错误处理中间件固定四个参数","，第一个参数是错误对象 ",[1574,1877,1878],{},"err","：",[1566,1881,1883],{"className":1568,"code":1882,"filename":1570,"language":1571,"meta":1572,"style":1572},"// 错误处理中间件：必须有四个参数，Express 靠参数个数识别它\napp.use((err, req, res, next) => {\n    console.error('出错了：', err.message);\n\n    res.status(500).json({ code: 500, message: '服务器开小差了，请稍后再试' });\n});\n",[1574,1884,1885,1890,1924,1957,1961,2010],{"__ignoreMap":1572},[1577,1886,1887],{"class":1579,"line":1580},[1577,1888,1889],{"class":1731},"// 错误处理中间件：必须有四个参数，Express 靠参数个数识别它\n",[1577,1891,1892,1894,1896,1898,1900,1902,1904,1906,1909,1911,1913,1915,1918,1920,1922],{"class":1579,"line":1608},[1577,1893,1645],{"class":1587},[1577,1895,1648],{"class":1594},[1577,1897,1742],{"class":1628},[1577,1899,1654],{"class":1587},[1577,1901,1654],{"class":1594},[1577,1903,1878],{"class":1670},[1577,1905,1664],{"class":1594},[1577,1907,1908],{"class":1670}," req",[1577,1910,1664],{"class":1594},[1577,1912,1676],{"class":1670},[1577,1914,1664],{"class":1594},[1577,1916,1917],{"class":1670}," next",[1577,1919,1679],{"class":1594},[1577,1921,1682],{"class":1618},[1577,1923,1685],{"class":1594},[1577,1925,1926,1929,1931,1934,1936,1938,1941,1943,1945,1948,1950,1953,1955],{"class":1579,"line":1615},[1577,1927,1928],{"class":1587},"    console",[1577,1930,1648],{"class":1594},[1577,1932,1933],{"class":1628},"error",[1577,1935,1654],{"class":1699},[1577,1937,1602],{"class":1594},[1577,1939,1940],{"class":1598},"出错了：",[1577,1942,1602],{"class":1594},[1577,1944,1664],{"class":1594},[1577,1946,1947],{"class":1587}," err",[1577,1949,1648],{"class":1594},[1577,1951,1952],{"class":1587},"message",[1577,1954,1679],{"class":1699},[1577,1956,1605],{"class":1594},[1577,1958,1959],{"class":1579,"line":1637},[1577,1960,1612],{"emptyLinePlaceholder":1611},[1577,1962,1963,1965,1967,1969,1971,1974,1976,1978,1980,1982,1984,1986,1988,1991,1993,1995,1997,1999,2002,2004,2006,2008],{"class":1579,"line":1642},[1577,1964,1691],{"class":1587},[1577,1966,1648],{"class":1594},[1577,1968,1768],{"class":1628},[1577,1970,1654],{"class":1699},[1577,1972,1973],{"class":1773},"500",[1577,1975,1679],{"class":1699},[1577,1977,1648],{"class":1594},[1577,1979,1781],{"class":1628},[1577,1981,1654],{"class":1699},[1577,1983,1786],{"class":1594},[1577,1985,1789],{"class":1699},[1577,1987,1792],{"class":1594},[1577,1989,1990],{"class":1773}," 500",[1577,1992,1664],{"class":1594},[1577,1994,1800],{"class":1699},[1577,1996,1792],{"class":1594},[1577,1998,1595],{"class":1594},[1577,2000,2001],{"class":1598},"服务器开小差了，请稍后再试",[1577,2003,1602],{"class":1594},[1577,2005,1812],{"class":1594},[1577,2007,1679],{"class":1699},[1577,2009,1605],{"class":1594},[1577,2011,2012,2014,2016],{"class":1579,"line":1688},[1577,2013,1716],{"class":1594},[1577,2015,1679],{"class":1587},[1577,2017,1605],{"class":1594},[1531,2019,2020,2021,2028],{},"Express 通过参数个数区分两种中间件，",[1548,2022,2023,2024,2027],{},"少写一个 ",[1574,2025,2026],{},"next"," 参数，它就变成普通中间件，永远接不到错误","。它的位置同样要放在所有路由之后。",[1531,2030,2031,2032,2035],{},"路由里出错了，用 ",[1574,2033,2034],{},"next(err)"," 把错误交给它：",[1566,2037,2039],{"className":1568,"code":2038,"filename":1570,"language":1571,"meta":1572,"style":1572},"app.get('/users/:id', (req, res, next) => {\n    const user = null; // 假设数据库没查到\n\n    if (!user) {\n        // 把错误传给错误处理中间件\n        return next(new Error('用户不存在'));\n    }\n\n    res.json(user);\n});\n",[1574,2040,2041,2078,2095,2099,2118,2123,2152,2157,2161,2177],{"__ignoreMap":1572},[1577,2042,2043,2045,2047,2049,2051,2053,2056,2058,2060,2062,2064,2066,2068,2070,2072,2074,2076],{"class":1579,"line":1580},[1577,2044,1645],{"class":1587},[1577,2046,1648],{"class":1594},[1577,2048,1651],{"class":1628},[1577,2050,1654],{"class":1587},[1577,2052,1602],{"class":1594},[1577,2054,2055],{"class":1598},"/users/:id",[1577,2057,1602],{"class":1594},[1577,2059,1664],{"class":1594},[1577,2061,1667],{"class":1594},[1577,2063,1671],{"class":1670},[1577,2065,1664],{"class":1594},[1577,2067,1676],{"class":1670},[1577,2069,1664],{"class":1594},[1577,2071,1917],{"class":1670},[1577,2073,1679],{"class":1594},[1577,2075,1682],{"class":1618},[1577,2077,1685],{"class":1594},[1577,2079,2080,2083,2086,2089,2092],{"class":1579,"line":1608},[1577,2081,2082],{"class":1618},"    const",[1577,2084,2085],{"class":1587}," user",[1577,2087,2088],{"class":1594}," =",[1577,2090,2091],{"class":1594}," null;",[1577,2093,2094],{"class":1731}," // 假设数据库没查到\n",[1577,2096,2097],{"class":1579,"line":1615},[1577,2098,1612],{"emptyLinePlaceholder":1611},[1577,2100,2101,2104,2106,2109,2112,2115],{"class":1579,"line":1637},[1577,2102,2103],{"class":1583},"    if",[1577,2105,1667],{"class":1699},[1577,2107,2108],{"class":1594},"!",[1577,2110,2111],{"class":1587},"user",[1577,2113,2114],{"class":1699},") ",[1577,2116,2117],{"class":1594},"{\n",[1577,2119,2120],{"class":1579,"line":1642},[1577,2121,2122],{"class":1731},"        // 把错误传给错误处理中间件\n",[1577,2124,2125,2128,2130,2132,2135,2138,2140,2142,2145,2147,2150],{"class":1579,"line":1688},[1577,2126,2127],{"class":1583},"        return",[1577,2129,1917],{"class":1628},[1577,2131,1654],{"class":1699},[1577,2133,2134],{"class":1594},"new",[1577,2136,2137],{"class":1628}," Error",[1577,2139,1654],{"class":1699},[1577,2141,1602],{"class":1594},[1577,2143,2144],{"class":1598},"用户不存在",[1577,2146,1602],{"class":1594},[1577,2148,2149],{"class":1699},"))",[1577,2151,1605],{"class":1594},[1577,2153,2154],{"class":1579,"line":1713},[1577,2155,2156],{"class":1594},"    }\n",[1577,2158,2159],{"class":1579,"line":1723},[1577,2160,1612],{"emptyLinePlaceholder":1611},[1577,2162,2163,2165,2167,2169,2171,2173,2175],{"class":1579,"line":1728},[1577,2164,1691],{"class":1587},[1577,2166,1648],{"class":1594},[1577,2168,1781],{"class":1628},[1577,2170,1654],{"class":1699},[1577,2172,2111],{"class":1587},[1577,2174,1679],{"class":1699},[1577,2176,1605],{"class":1594},[1577,2178,2179,2181,2183],{"class":1579,"line":1735},[1577,2180,1716],{"class":1594},[1577,2182,1679],{"class":1587},[1577,2184,1605],{"class":1594},[1535,2186],{},[1526,2188,2190],{"id":2189},"express-5异步错误自动捕获","✨ Express 5：异步错误自动捕获",[1531,2192,2193,2194,2197],{},"路由处理函数是 ",[1574,2195,2196],{},"async"," 的，里面抛错怎么办？这是 Express 5 和 4 的一个重要区别。",[1531,2199,2200,1879,2203,2205,2206,2209,2210,2212],{},[1548,2201,2202],{},"Express 4",[1574,2204,2196],{}," 函数里抛错不会被自动捕获，必须手动 ",[1574,2207,2208],{},"try/catch"," 再 ",[1574,2211,2034],{},"，否则进程可能直接崩溃。这是 Express 4 时代的著名踩坑点。",[1531,2214,2215,2218,2219,2221,2222,1879],{},[1548,2216,2217],{},"Express 5","：框架会自动捕获 ",[1574,2220,2196],{}," 路由里抛出的错误和 rejected 的 Promise，直接转交错误处理中间件，不需要手动 ",[1574,2223,2034],{},[1566,2225,2227],{"className":1568,"code":2226,"filename":1570,"language":1571,"meta":1572,"style":1572},"app.get('/users', async (req, res) => {\n    // Express 5 中，这个错误会自动进入错误处理中间件\n    throw new Error('数据库查询失败');\n});\n",[1574,2228,2229,2265,2270,2293],{"__ignoreMap":1572},[1577,2230,2231,2233,2235,2237,2239,2241,2244,2246,2248,2251,2253,2255,2257,2259,2261,2263],{"class":1579,"line":1580},[1577,2232,1645],{"class":1587},[1577,2234,1648],{"class":1594},[1577,2236,1651],{"class":1628},[1577,2238,1654],{"class":1587},[1577,2240,1602],{"class":1594},[1577,2242,2243],{"class":1598},"/users",[1577,2245,1602],{"class":1594},[1577,2247,1664],{"class":1594},[1577,2249,2250],{"class":1618}," async",[1577,2252,1667],{"class":1594},[1577,2254,1671],{"class":1670},[1577,2256,1664],{"class":1594},[1577,2258,1676],{"class":1670},[1577,2260,1679],{"class":1594},[1577,2262,1682],{"class":1618},[1577,2264,1685],{"class":1594},[1577,2266,2267],{"class":1579,"line":1608},[1577,2268,2269],{"class":1731},"    // Express 5 中，这个错误会自动进入错误处理中间件\n",[1577,2271,2272,2275,2278,2280,2282,2284,2287,2289,2291],{"class":1579,"line":1615},[1577,2273,2274],{"class":1583},"    throw",[1577,2276,2277],{"class":1594}," new",[1577,2279,2137],{"class":1628},[1577,2281,1654],{"class":1699},[1577,2283,1602],{"class":1594},[1577,2285,2286],{"class":1598},"数据库查询失败",[1577,2288,1602],{"class":1594},[1577,2290,1679],{"class":1699},[1577,2292,1605],{"class":1594},[1577,2294,2295,2297,2299],{"class":1579,"line":1637},[1577,2296,1716],{"class":1594},[1577,2298,1679],{"class":1587},[1577,2300,1605],{"class":1594},[1531,2302,2303,2304,2306],{},"配上前面的错误处理中间件，访问 ",[1574,2305,2243],{}," 会收到统一的 500 JSON 响应，服务也不会崩。",[2308,2309,2310],"warning",{},[1531,2311,2312,2313,2315,2316,2319,2320,2322,2323,2325,2326,2328],{},"自动捕获只针对 ",[1574,2314,2196],{}," 函数里的异常。同步回调里（比如 ",[1574,2317,2318],{},"setTimeout"," 里）抛出的错误依然捕获不到，那种场景需要自己在回调里 ",[1574,2321,2208],{}," 后调用 ",[1574,2324,2034],{},"。日常开发把路由写成 ",[1574,2327,2196],{}," 函数就能覆盖绝大多数情况。",[1535,2330],{},[1526,2332,2334],{"id":2333},"统一错误响应格式","🛠 统一错误响应格式",[1531,2336,2337],{},"把所有拼起来，给项目定一套统一的响应约定：",[2339,2340,2341,2348],"ul",{},[2342,2343,2344,2345],"li",{},"成功：",[1574,2346,2347],{},"{ code: 0, data: 数据 }",[2342,2349,2350,2351],{},"失败：",[1574,2352,2353],{},"{ code: 错误码, message: '提示信息' }",[1566,2355,2357],{"className":1568,"code":2356,"filename":1570,"language":1571,"meta":1572,"style":1572},"import express from 'express';\n\nconst app = express();\n\napp.use(express.json());\n\napp.get('/users/:id', async (req, res) => {\n    const id = Number(req.params.id);\n\n    if (id !== 1) {\n        // 抛出错误，交给错误处理中间件统一处理\n        throw new Error('用户不存在');\n    }\n\n    res.json({ code: 0, data: { id: 1, name: '小明' } });\n});\n\n// 404 兜底\napp.use((req, res) => {\n    res.status(404).json({ code: 404, message: '接口不存在' });\n});\n\n// 统一错误处理\napp.use((err, req, res, next) => {\n    console.error('出错了：', err.message);\n\n    res.status(500).json({ code: 500, message: err.message });\n});\n\napp.listen(3000);\n",[1574,2358,2359,2375,2379,2393,2397,2417,2421,2455,2485,2489,2507,2512,2533,2537,2541,2599,2608,2613,2619,2644,2691,2700,2705,2711,2744,2773,2778,2825,2834,2839],{"__ignoreMap":1572},[1577,2360,2361,2363,2365,2367,2369,2371,2373],{"class":1579,"line":1580},[1577,2362,1584],{"class":1583},[1577,2364,1588],{"class":1587},[1577,2366,1591],{"class":1583},[1577,2368,1595],{"class":1594},[1577,2370,1599],{"class":1598},[1577,2372,1602],{"class":1594},[1577,2374,1605],{"class":1594},[1577,2376,2377],{"class":1579,"line":1608},[1577,2378,1612],{"emptyLinePlaceholder":1611},[1577,2380,2381,2383,2385,2387,2389,2391],{"class":1579,"line":1615},[1577,2382,1619],{"class":1618},[1577,2384,1622],{"class":1587},[1577,2386,1625],{"class":1594},[1577,2388,1629],{"class":1628},[1577,2390,1632],{"class":1587},[1577,2392,1605],{"class":1594},[1577,2394,2395],{"class":1579,"line":1637},[1577,2396,1612],{"emptyLinePlaceholder":1611},[1577,2398,2399,2401,2403,2405,2408,2410,2412,2415],{"class":1579,"line":1642},[1577,2400,1645],{"class":1587},[1577,2402,1648],{"class":1594},[1577,2404,1742],{"class":1628},[1577,2406,2407],{"class":1587},"(express",[1577,2409,1648],{"class":1594},[1577,2411,1781],{"class":1628},[1577,2413,2414],{"class":1587},"())",[1577,2416,1605],{"class":1594},[1577,2418,2419],{"class":1579,"line":1688},[1577,2420,1612],{"emptyLinePlaceholder":1611},[1577,2422,2423,2425,2427,2429,2431,2433,2435,2437,2439,2441,2443,2445,2447,2449,2451,2453],{"class":1579,"line":1713},[1577,2424,1645],{"class":1587},[1577,2426,1648],{"class":1594},[1577,2428,1651],{"class":1628},[1577,2430,1654],{"class":1587},[1577,2432,1602],{"class":1594},[1577,2434,2055],{"class":1598},[1577,2436,1602],{"class":1594},[1577,2438,1664],{"class":1594},[1577,2440,2250],{"class":1618},[1577,2442,1667],{"class":1594},[1577,2444,1671],{"class":1670},[1577,2446,1664],{"class":1594},[1577,2448,1676],{"class":1670},[1577,2450,1679],{"class":1594},[1577,2452,1682],{"class":1618},[1577,2454,1685],{"class":1594},[1577,2456,2457,2459,2462,2464,2467,2469,2471,2473,2476,2478,2481,2483],{"class":1579,"line":1723},[1577,2458,2082],{"class":1618},[1577,2460,2461],{"class":1587}," id",[1577,2463,2088],{"class":1594},[1577,2465,2466],{"class":1628}," Number",[1577,2468,1654],{"class":1699},[1577,2470,1671],{"class":1587},[1577,2472,1648],{"class":1594},[1577,2474,2475],{"class":1587},"params",[1577,2477,1648],{"class":1594},[1577,2479,2480],{"class":1587},"id",[1577,2482,1679],{"class":1699},[1577,2484,1605],{"class":1594},[1577,2486,2487],{"class":1579,"line":1728},[1577,2488,1612],{"emptyLinePlaceholder":1611},[1577,2490,2491,2493,2495,2497,2500,2503,2505],{"class":1579,"line":1735},[1577,2492,2103],{"class":1583},[1577,2494,1667],{"class":1699},[1577,2496,2480],{"class":1587},[1577,2498,2499],{"class":1594}," !==",[1577,2501,2502],{"class":1773}," 1",[1577,2504,2114],{"class":1699},[1577,2506,2117],{"class":1594},[1577,2508,2509],{"class":1579,"line":1761},[1577,2510,2511],{"class":1731},"        // 抛出错误，交给错误处理中间件统一处理\n",[1577,2513,2514,2517,2519,2521,2523,2525,2527,2529,2531],{"class":1579,"line":1819},[1577,2515,2516],{"class":1583},"        throw",[1577,2518,2277],{"class":1594},[1577,2520,2137],{"class":1628},[1577,2522,1654],{"class":1699},[1577,2524,1602],{"class":1594},[1577,2526,2144],{"class":1598},[1577,2528,1602],{"class":1594},[1577,2530,1679],{"class":1699},[1577,2532,1605],{"class":1594},[1577,2534,2535],{"class":1579,"line":1828},[1577,2536,2156],{"class":1594},[1577,2538,2539],{"class":1579,"line":1833},[1577,2540,1612],{"emptyLinePlaceholder":1611},[1577,2542,2544,2546,2548,2550,2552,2554,2556,2558,2561,2563,2566,2568,2571,2573,2575,2577,2579,2582,2584,2586,2589,2591,2593,2595,2597],{"class":1579,"line":2543},15,[1577,2545,1691],{"class":1587},[1577,2547,1648],{"class":1594},[1577,2549,1781],{"class":1628},[1577,2551,1654],{"class":1699},[1577,2553,1786],{"class":1594},[1577,2555,1789],{"class":1699},[1577,2557,1792],{"class":1594},[1577,2559,2560],{"class":1773}," 0",[1577,2562,1664],{"class":1594},[1577,2564,2565],{"class":1699}," data",[1577,2567,1792],{"class":1594},[1577,2569,2570],{"class":1594}," {",[1577,2572,2461],{"class":1699},[1577,2574,1792],{"class":1594},[1577,2576,2502],{"class":1773},[1577,2578,1664],{"class":1594},[1577,2580,2581],{"class":1699}," name",[1577,2583,1792],{"class":1594},[1577,2585,1595],{"class":1594},[1577,2587,2588],{"class":1598},"小明",[1577,2590,1602],{"class":1594},[1577,2592,1812],{"class":1594},[1577,2594,1812],{"class":1594},[1577,2596,1679],{"class":1699},[1577,2598,1605],{"class":1594},[1577,2600,2602,2604,2606],{"class":1579,"line":2601},16,[1577,2603,1716],{"class":1594},[1577,2605,1679],{"class":1587},[1577,2607,1605],{"class":1594},[1577,2609,2611],{"class":1579,"line":2610},17,[1577,2612,1612],{"emptyLinePlaceholder":1611},[1577,2614,2616],{"class":1579,"line":2615},18,[1577,2617,2618],{"class":1731},"// 404 兜底\n",[1577,2620,2622,2624,2626,2628,2630,2632,2634,2636,2638,2640,2642],{"class":1579,"line":2621},19,[1577,2623,1645],{"class":1587},[1577,2625,1648],{"class":1594},[1577,2627,1742],{"class":1628},[1577,2629,1654],{"class":1587},[1577,2631,1654],{"class":1594},[1577,2633,1671],{"class":1670},[1577,2635,1664],{"class":1594},[1577,2637,1676],{"class":1670},[1577,2639,1679],{"class":1594},[1577,2641,1682],{"class":1618},[1577,2643,1685],{"class":1594},[1577,2645,2647,2649,2651,2653,2655,2657,2659,2661,2663,2665,2667,2669,2671,2673,2675,2677,2679,2681,2683,2685,2687,2689],{"class":1579,"line":2646},20,[1577,2648,1691],{"class":1587},[1577,2650,1648],{"class":1594},[1577,2652,1768],{"class":1628},[1577,2654,1654],{"class":1699},[1577,2656,1774],{"class":1773},[1577,2658,1679],{"class":1699},[1577,2660,1648],{"class":1594},[1577,2662,1781],{"class":1628},[1577,2664,1654],{"class":1699},[1577,2666,1786],{"class":1594},[1577,2668,1789],{"class":1699},[1577,2670,1792],{"class":1594},[1577,2672,1795],{"class":1773},[1577,2674,1664],{"class":1594},[1577,2676,1800],{"class":1699},[1577,2678,1792],{"class":1594},[1577,2680,1595],{"class":1594},[1577,2682,1807],{"class":1598},[1577,2684,1602],{"class":1594},[1577,2686,1812],{"class":1594},[1577,2688,1679],{"class":1699},[1577,2690,1605],{"class":1594},[1577,2692,2694,2696,2698],{"class":1579,"line":2693},21,[1577,2695,1716],{"class":1594},[1577,2697,1679],{"class":1587},[1577,2699,1605],{"class":1594},[1577,2701,2703],{"class":1579,"line":2702},22,[1577,2704,1612],{"emptyLinePlaceholder":1611},[1577,2706,2708],{"class":1579,"line":2707},23,[1577,2709,2710],{"class":1731},"// 统一错误处理\n",[1577,2712,2714,2716,2718,2720,2722,2724,2726,2728,2730,2732,2734,2736,2738,2740,2742],{"class":1579,"line":2713},24,[1577,2715,1645],{"class":1587},[1577,2717,1648],{"class":1594},[1577,2719,1742],{"class":1628},[1577,2721,1654],{"class":1587},[1577,2723,1654],{"class":1594},[1577,2725,1878],{"class":1670},[1577,2727,1664],{"class":1594},[1577,2729,1908],{"class":1670},[1577,2731,1664],{"class":1594},[1577,2733,1676],{"class":1670},[1577,2735,1664],{"class":1594},[1577,2737,1917],{"class":1670},[1577,2739,1679],{"class":1594},[1577,2741,1682],{"class":1618},[1577,2743,1685],{"class":1594},[1577,2745,2747,2749,2751,2753,2755,2757,2759,2761,2763,2765,2767,2769,2771],{"class":1579,"line":2746},25,[1577,2748,1928],{"class":1587},[1577,2750,1648],{"class":1594},[1577,2752,1933],{"class":1628},[1577,2754,1654],{"class":1699},[1577,2756,1602],{"class":1594},[1577,2758,1940],{"class":1598},[1577,2760,1602],{"class":1594},[1577,2762,1664],{"class":1594},[1577,2764,1947],{"class":1587},[1577,2766,1648],{"class":1594},[1577,2768,1952],{"class":1587},[1577,2770,1679],{"class":1699},[1577,2772,1605],{"class":1594},[1577,2774,2776],{"class":1579,"line":2775},26,[1577,2777,1612],{"emptyLinePlaceholder":1611},[1577,2779,2781,2783,2785,2787,2789,2791,2793,2795,2797,2799,2801,2803,2805,2807,2809,2811,2813,2815,2817,2819,2821,2823],{"class":1579,"line":2780},27,[1577,2782,1691],{"class":1587},[1577,2784,1648],{"class":1594},[1577,2786,1768],{"class":1628},[1577,2788,1654],{"class":1699},[1577,2790,1973],{"class":1773},[1577,2792,1679],{"class":1699},[1577,2794,1648],{"class":1594},[1577,2796,1781],{"class":1628},[1577,2798,1654],{"class":1699},[1577,2800,1786],{"class":1594},[1577,2802,1789],{"class":1699},[1577,2804,1792],{"class":1594},[1577,2806,1990],{"class":1773},[1577,2808,1664],{"class":1594},[1577,2810,1800],{"class":1699},[1577,2812,1792],{"class":1594},[1577,2814,1947],{"class":1587},[1577,2816,1648],{"class":1594},[1577,2818,1952],{"class":1587},[1577,2820,1812],{"class":1594},[1577,2822,1679],{"class":1699},[1577,2824,1605],{"class":1594},[1577,2826,2828,2830,2832],{"class":1579,"line":2827},28,[1577,2829,1716],{"class":1594},[1577,2831,1679],{"class":1587},[1577,2833,1605],{"class":1594},[1577,2835,2837],{"class":1579,"line":2836},29,[1577,2838,1612],{"emptyLinePlaceholder":1611},[1577,2840,2842,2844,2846,2848,2850,2852,2854],{"class":1579,"line":2841},30,[1577,2843,1645],{"class":1587},[1577,2845,1648],{"class":1594},[1577,2847,1840],{"class":1628},[1577,2849,1654],{"class":1587},[1577,2851,1845],{"class":1773},[1577,2853,1679],{"class":1587},[1577,2855,1605],{"class":1594},[1531,2857,2858],{},"有了这套结构，路由里只管抛错，响应格式由错误处理中间件统一把控，前端拿到任何响应都能按同一个约定解析。",[1535,2860],{},[1526,2862,2864],{"id":2863},"小节总结","🧾 小节总结",[2339,2866,2867,2870,2877,2886,2889],{},[2342,2868,2869],{},"在所有路由之后注册兜底中间件，统一返回 JSON 格式的 404 响应。",[2342,2871,2872,2873,2876],{},"错误处理中间件固定四个参数 ",[1574,2874,2875],{},"(err, req, res, next)","，Express 靠参数个数识别它。",[2342,2878,2879,2880,2882,2883,2885],{},"同步代码里用 ",[1574,2881,2034],{}," 传递错误；Express 5 中 ",[1574,2884,2196],{}," 路由抛错会自动进入错误处理中间件，这是相比 Express 4 的明显改进。",[2342,2887,2888],{},"错误处理中间件必须写在所有路由之后，否则接不到前面路由抛出的错误。",[2342,2890,2891],{},"建议统一响应格式，成功和失败都有固定结构，方便前端统一处理。",[1535,2893],{},[1526,2895,2897],{"id":2896},"知识问答","❓ 知识问答",[1531,2899,2900],{},[1548,2901,2902],{},"Q1：错误处理中间件里的 next 用不上，能删掉吗？",[1531,2904,2905,2906,2908],{},"不能。Express 是靠函数参数的个数来识别错误处理中间件的，必须是四个参数。删掉 ",[1574,2907,2026],{}," 它就变成普通中间件，收不到任何错误。",[1531,2910,2911],{},[1548,2912,2913],{},"Q2：next() 和 next(err) 有什么区别？",[1531,2915,2916,2919,2920,2922],{},[1574,2917,2918],{},"next()"," 是正常放行，交给下一个普通中间件或路由；",[1574,2921,2034],{}," 是报告出错，Express 会跳过后续所有普通中间件和路由，直接进入错误处理中间件。",[1531,2924,2925],{},[1548,2926,2927],{},"Q3：抛错后服务器会挂掉吗？",[1531,2929,2930,2931,2933,2934,2936],{},"只要错误进入了错误处理中间件，服务就不会挂，还能继续处理其他请求。真正危险的是 Express 5 里那些没被捕获的异步回调错误（如 ",[1574,2932,2318],{}," 里的异常），可能导致进程退出，需要自行 ",[1574,2935,2208],{},"。",[1531,2938,2939],{},[1548,2940,2941],{},"Q4：404 和 500 的处理能合并成一个中间件吗？",[1531,2943,2944],{},"不建议。404 是“没有路由命中”，错误处理是“路由执行中出错”，触发时机完全不同。分开写职责清晰，也是社区通用的做法。",[1535,2946],{},[1526,2948,2950],{"id":2949},"小练习","🧪 小练习",[1531,2952,2953,2954,2957,2958,2961,2962,2965,2966,2969,2970,2972],{},"给 ",[1574,2955,2956],{},"/divide"," 接口加上错误处理：接收查询参数 ",[1574,2959,2960],{},"a"," 和 ",[1574,2963,2964],{},"b","，返回 ",[1574,2967,2968],{},"a / b"," 的结果；当 ",[1574,2971,2964],{}," 为 0 时抛出错误，由错误处理中间件返回统一的错误 JSON。",[1566,2974,2976],{"className":1568,"code":2975,"filename":1570,"language":1571,"meta":1572,"style":1572},"import express from 'express';\n\nconst app = express();\n\napp.get('/divide', async (req, res) => {\n    // 请在这里编写代码\n});\n\n// 请在这里编写 404 兜底和错误处理中间件\n\napp.listen(3000);\n",[1574,2977,2978,2994,2998,3012,3016,3050,3055,3063,3067,3072,3076],{"__ignoreMap":1572},[1577,2979,2980,2982,2984,2986,2988,2990,2992],{"class":1579,"line":1580},[1577,2981,1584],{"class":1583},[1577,2983,1588],{"class":1587},[1577,2985,1591],{"class":1583},[1577,2987,1595],{"class":1594},[1577,2989,1599],{"class":1598},[1577,2991,1602],{"class":1594},[1577,2993,1605],{"class":1594},[1577,2995,2996],{"class":1579,"line":1608},[1577,2997,1612],{"emptyLinePlaceholder":1611},[1577,2999,3000,3002,3004,3006,3008,3010],{"class":1579,"line":1615},[1577,3001,1619],{"class":1618},[1577,3003,1622],{"class":1587},[1577,3005,1625],{"class":1594},[1577,3007,1629],{"class":1628},[1577,3009,1632],{"class":1587},[1577,3011,1605],{"class":1594},[1577,3013,3014],{"class":1579,"line":1637},[1577,3015,1612],{"emptyLinePlaceholder":1611},[1577,3017,3018,3020,3022,3024,3026,3028,3030,3032,3034,3036,3038,3040,3042,3044,3046,3048],{"class":1579,"line":1642},[1577,3019,1645],{"class":1587},[1577,3021,1648],{"class":1594},[1577,3023,1651],{"class":1628},[1577,3025,1654],{"class":1587},[1577,3027,1602],{"class":1594},[1577,3029,2956],{"class":1598},[1577,3031,1602],{"class":1594},[1577,3033,1664],{"class":1594},[1577,3035,2250],{"class":1618},[1577,3037,1667],{"class":1594},[1577,3039,1671],{"class":1670},[1577,3041,1664],{"class":1594},[1577,3043,1676],{"class":1670},[1577,3045,1679],{"class":1594},[1577,3047,1682],{"class":1618},[1577,3049,1685],{"class":1594},[1577,3051,3052],{"class":1579,"line":1688},[1577,3053,3054],{"class":1731},"    // 请在这里编写代码\n",[1577,3056,3057,3059,3061],{"class":1579,"line":1713},[1577,3058,1716],{"class":1594},[1577,3060,1679],{"class":1587},[1577,3062,1605],{"class":1594},[1577,3064,3065],{"class":1579,"line":1723},[1577,3066,1612],{"emptyLinePlaceholder":1611},[1577,3068,3069],{"class":1579,"line":1728},[1577,3070,3071],{"class":1731},"// 请在这里编写 404 兜底和错误处理中间件\n",[1577,3073,3074],{"class":1579,"line":1735},[1577,3075,1612],{"emptyLinePlaceholder":1611},[1577,3077,3078,3080,3082,3084,3086,3088,3090],{"class":1579,"line":1761},[1577,3079,1645],{"class":1587},[1577,3081,1648],{"class":1594},[1577,3083,1840],{"class":1628},[1577,3085,1654],{"class":1587},[1577,3087,1845],{"class":1773},[1577,3089,1679],{"class":1587},[1577,3091,1605],{"class":1594},[1535,3093],{},[1531,3095,3096],{},"🎉 恭喜你已经掌握了 Express 的错误处理！下一篇是综合实战：用前面所有知识搭建一套完整的 RESTful 用户接口。",[3098,3099,3100],"style",{},"html pre.shiki code .s8pZq, html code.shiki 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