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this;\n",[1610,1775,1776],{"class":1612,"line":1679},[1610,1777,1779],{"emptyLinePlaceholder":1778},true,"\n",[1610,1781,1782],{"class":1612,"line":1697},[1610,1783,1785],{"class":1784},"syuKq","        // 默认校验 ctx.request.body：name 必须是字符串，age 必须是数字\n",[1610,1787,1788,1791,1794,1797,1800],{"class":1612,"line":1703},[1610,1789,1790],{"class":1764},"        ctx",[1610,1792,1793],{"class":1642},".",[1610,1795,1716],{"class":1796},"swgpB",[1610,1798,1799],{"class":1655},"(",[1610,1801,1802],{"class":1642},"{\n",[1610,1804,1806,1809,1811,1813,1816,1818,1820,1823,1825,1828,1831,1833,1835],{"class":1612,"line":1805},7,[1610,1807,1808],{"class":1655},"            name",[1610,1810,1659],{"class":1642},[1610,1812,1761],{"class":1642},[1610,1814,1815],{"class":1655}," type",[1610,1817,1659],{"class":1642},[1610,1819,1687],{"class":1642},[1610,1821,1822],{"class":1620},"string",[1610,1824,1692],{"class":1642},[1610,1826,1827],{"class":1642},",",[1610,1829,1830],{"class":1655}," required",[1610,1832,1659],{"class":1642},[1610,1834,1673],{"class":1672},[1610,1836,1837],{"class":1642}," },\n",[1610,1839,1841,1844,1846,1848,1850,1852,1854,1857,1859,1861,1863,1865,1867],{"class":1612,"line":1840},8,[1610,1842,1843],{"class":1655},"            age",[1610,1845,1659],{"class":1642},[1610,1847,1761],{"class":1642},[1610,1849,1815],{"class":1655},[1610,1851,1659],{"class":1642},[1610,1853,1687],{"class":1642},[1610,1855,1856],{"class":1620},"number",[1610,1858,1692],{"class":1642},[1610,1860,1827],{"class":1642},[1610,1862,1830],{"class":1655},[1610,1864,1659],{"class":1642},[1610,1866,1673],{"class":1672},[1610,1868,1837],{"class":1642},[1610,1870,1872,1875,1878],{"class":1612,"line":1871},9,[1610,1873,1874],{"class":1642},"        }",[1610,1876,1877],{"class":1655},")",[1610,1879,1880],{"class":1642},";\n",[1610,1882,1884],{"class":1612,"line":1883},10,[1610,1885,1779],{"emptyLinePlaceholder":1778},[1610,1887,1889,1891,1894,1896,1900,1902,1904,1907,1909,1912,1914,1917,1919,1921,1923,1926,1928,1931,1933],{"class":1612,"line":1888},11,[1610,1890,1758],{"class":1728},[1610,1892,1893],{"class":1764}," user",[1610,1895,1646],{"class":1642},[1610,1897,1899],{"class":1898},"s8pZq"," await",[1610,1901,1765],{"class":1764},[1610,1903,1793],{"class":1642},[1610,1905,1906],{"class":1764},"service",[1610,1908,1793],{"class":1642},[1610,1910,1911],{"class":1764},"user",[1610,1913,1793],{"class":1642},[1610,1915,1916],{"class":1796},"create",[1610,1918,1799],{"class":1655},[1610,1920,1712],{"class":1764},[1610,1922,1793],{"class":1642},[1610,1924,1925],{"class":1764},"request",[1610,1927,1793],{"class":1642},[1610,1929,1930],{"class":1764},"body",[1610,1932,1877],{"class":1655},[1610,1934,1880],{"class":1642},[1610,1936,1938,1940,1942,1945,1947,1951],{"class":1612,"line":1937},12,[1610,1939,1790],{"class":1764},[1610,1941,1793],{"class":1642},[1610,1943,1944],{"class":1764},"status",[1610,1946,1646],{"class":1642},[1610,1948,1950],{"class":1949},"smPcV"," 201",[1610,1952,1880],{"class":1642},[1610,1954,1956,1958,1960,1962,1964,1966],{"class":1612,"line":1955},13,[1610,1957,1790],{"class":1764},[1610,1959,1793],{"class":1642},[1610,1961,1930],{"class":1764},[1610,1963,1646],{"class":1642},[1610,1965,1893],{"class":1764},[1610,1967,1880],{"class":1642},[1610,1969,1971],{"class":1612,"line":1970},14,[1610,1972,1973],{"class":1642},"    }\n",[1610,1975,1977],{"class":1612,"line":1976},15,[1610,1978,1979],{"class":1642},"}\n",[1530,1981,1982,1983,1986],{},"用 curl 发一个缺少 ",[1558,1984,1985],{},"age"," 的请求试试：",[1601,1988,1990],{"className":1603,"code":1989,"language":1605,"meta":1606,"style":1606},"curl -X POST http://127.0.0.1:7001/users \\\n    -H 'Content-Type: application/json' \\\n    -d '{\"name\":\"小刚\"}'\n",[1558,1991,1992,2009,2023],{"__ignoreMap":1606},[1610,1993,1994,1997,2000,2003,2006],{"class":1612,"line":1613},[1610,1995,1996],{"class":1616},"curl",[1610,1998,1999],{"class":1620}," -X",[1610,2001,2002],{"class":1620}," POST",[1610,2004,2005],{"class":1620}," http://127.0.0.1:7001/users",[1610,2007,2008],{"class":1764}," \\\n",[1610,2010,2011,2014,2016,2019,2021],{"class":1612,"line":1652},[1610,2012,2013],{"class":1620},"    -H",[1610,2015,1687],{"class":1642},[1610,2017,2018],{"class":1620},"Content-Type: application/json",[1610,2020,1692],{"class":1642},[1610,2022,2008],{"class":1764},[1610,2024,2025,2028,2030,2033],{"class":1612,"line":1664},[1610,2026,2027],{"class":1620},"    -d",[1610,2029,1687],{"class":1642},[1610,2031,2032],{"class":1620},"{\"name\":\"小刚\"}",[1610,2034,2035],{"class":1642},"'\n",[1530,2037,2038,2039,2042,2043,2046],{},"校验不通过时会抛出 ",[1544,2040,2041],{},"422"," 错误，后面的代码不会执行。想返回自定义的错误格式，用 ",[1558,2044,2045],{},"try/catch"," 接住：",[1601,2048,2050],{"className":1633,"code":2049,"filename":1721,"language":1635,"meta":1606,"style":1606},"async create() {\n    const { ctx } = this;\n\n    try {\n        ctx.validate({\n            name: { type: 'string', required: true },\n            age: { type: 'number', required: true },\n        });\n    } catch (err) {\n        ctx.status = 422;\n        ctx.body = { message: '参数不完整或格式不正确' };\n        return;\n    }\n\n    // 校验通过后的逻辑\n}\n",[1558,2051,2052,2064,2079,2083,2090,2102,2130,2158,2166,2185,2200,2227,2234,2238,2242,2247],{"__ignoreMap":1606},[1610,2053,2054,2057,2059,2062],{"class":1612,"line":1613},[1610,2055,2056],{"class":1764},"async ",[1610,2058,1916],{"class":1796},[1610,2060,2061],{"class":1764},"() ",[1610,2063,1802],{"class":1642},[1610,2065,2066,2069,2071,2073,2075,2077],{"class":1612,"line":1652},[1610,2067,2068],{"class":1728},"    const",[1610,2070,1761],{"class":1642},[1610,2072,1765],{"class":1764},[1610,2074,1768],{"class":1642},[1610,2076,1646],{"class":1642},[1610,2078,1773],{"class":1642},[1610,2080,2081],{"class":1612,"line":1664},[1610,2082,1779],{"emptyLinePlaceholder":1778},[1610,2084,2085,2088],{"class":1612,"line":1679},[1610,2086,2087],{"class":1898},"    try",[1610,2089,1649],{"class":1642},[1610,2091,2092,2094,2096,2098,2100],{"class":1612,"line":1697},[1610,2093,1790],{"class":1764},[1610,2095,1793],{"class":1642},[1610,2097,1716],{"class":1796},[1610,2099,1799],{"class":1655},[1610,2101,1802],{"class":1642},[1610,2103,2104,2106,2108,2110,2112,2114,2116,2118,2120,2122,2124,2126,2128],{"class":1612,"line":1703},[1610,2105,1808],{"class":1655},[1610,2107,1659],{"class":1642},[1610,2109,1761],{"class":1642},[1610,2111,1815],{"class":1655},[1610,2113,1659],{"class":1642},[1610,2115,1687],{"class":1642},[1610,2117,1822],{"class":1620},[1610,2119,1692],{"class":1642},[1610,2121,1827],{"class":1642},[1610,2123,1830],{"class":1655},[1610,2125,1659],{"class":1642},[1610,2127,1673],{"class":1672},[1610,2129,1837],{"class":1642},[1610,2131,2132,2134,2136,2138,2140,2142,2144,2146,2148,2150,2152,2154,2156],{"class":1612,"line":1805},[1610,2133,1843],{"class":1655},[1610,2135,1659],{"class":1642},[1610,2137,1761],{"class":1642},[1610,2139,1815],{"class":1655},[1610,2141,1659],{"class":1642},[1610,2143,1687],{"class":1642},[1610,2145,1856],{"class":1620},[1610,2147,1692],{"class":1642},[1610,2149,1827],{"class":1642},[1610,2151,1830],{"class":1655},[1610,2153,1659],{"class":1642},[1610,2155,1673],{"class":1672},[1610,2157,1837],{"class":1642},[1610,2159,2160,2162,2164],{"class":1612,"line":1840},[1610,2161,1874],{"class":1642},[1610,2163,1877],{"class":1655},[1610,2165,1880],{"class":1642},[1610,2167,2168,2171,2174,2177,2180,2183],{"class":1612,"line":1871},[1610,2169,2170],{"class":1642},"    }",[1610,2172,2173],{"class":1898}," catch",[1610,2175,2176],{"class":1655}," (",[1610,2178,2179],{"class":1764},"err",[1610,2181,2182],{"class":1655},") ",[1610,2184,1802],{"class":1642},[1610,2186,2187,2189,2191,2193,2195,2198],{"class":1612,"line":1883},[1610,2188,1790],{"class":1764},[1610,2190,1793],{"class":1642},[1610,2192,1944],{"class":1764},[1610,2194,1646],{"class":1642},[1610,2196,2197],{"class":1949}," 422",[1610,2199,1880],{"class":1642},[1610,2201,2202,2204,2206,2208,2210,2212,2215,2217,2219,2222,2224],{"class":1612,"line":1888},[1610,2203,1790],{"class":1764},[1610,2205,1793],{"class":1642},[1610,2207,1930],{"class":1764},[1610,2209,1646],{"class":1642},[1610,2211,1761],{"class":1642},[1610,2213,2214],{"class":1655}," message",[1610,2216,1659],{"class":1642},[1610,2218,1687],{"class":1642},[1610,2220,2221],{"class":1620},"参数不完整或格式不正确",[1610,2223,1692],{"class":1642},[1610,2225,2226],{"class":1642}," };\n",[1610,2228,2229,2232],{"class":1612,"line":1937},[1610,2230,2231],{"class":1898},"        return",[1610,2233,1880],{"class":1642},[1610,2235,2236],{"class":1612,"line":1955},[1610,2237,1973],{"class":1642},[1610,2239,2240],{"class":1612,"line":1970},[1610,2241,1779],{"emptyLinePlaceholder":1778},[1610,2243,2244],{"class":1612,"line":1976},[1610,2245,2246],{"class":1784},"    // 校验通过后的逻辑\n",[1610,2248,2250],{"class":1612,"line":2249},16,[1610,2251,1979],{"class":1642},[1534,2253],{},[1525,2255,2257],{"id":2256},"extend-扩展是什么","🧱 extend 扩展是什么",[1530,2259,2260,2261,2264,2265,2268],{},"插件是引入别人的能力，",[1544,2262,2263],{},"extend 则是自己动手给框架的内置对象添加方法","。Egg 允许我们在 ",[1558,2266,2267],{},"app/extend"," 目录下扩展这些常用对象：",[2270,2271,2272,2288],"table",{},[2273,2274,2275],"thead",{},[2276,2277,2278,2282,2285],"tr",{},[2279,2280,2281],"th",{},"文件",[2279,2283,2284],{},"扩展的对象",[2279,2286,2287],{},"典型用途",[2289,2290,2291,2303,2313,2324,2335],"tbody",{},[2276,2292,2293,2297,2300],{},[2294,2295,2296],"td",{},"application.js",[2294,2298,2299],{},"app",[2294,2301,2302],{},"全局共享的方法或数据",[2276,2304,2305,2308,2310],{},[2294,2306,2307],{},"context.js",[2294,2309,1712],{},[2294,2311,2312],{},"每个请求可用的工具方法",[2276,2314,2315,2318,2321],{},[2294,2316,2317],{},"helper.js",[2294,2319,2320],{},"ctx.helper",[2294,2322,2323],{},"视图和响应相关的辅助函数",[2276,2325,2326,2329,2332],{},[2294,2327,2328],{},"request.js",[2294,2330,2331],{},"ctx.request",[2294,2333,2334],{},"请求相关的扩展",[2276,2336,2337,2340,2343],{},[2294,2338,2339],{},"response.js",[2294,2341,2342],{},"ctx.response",[2294,2344,2345],{},"响应相关的扩展",[1530,2347,2348,2349,2351],{},"其中比较常用的是 ",[1558,2350,2317],{},"，我们用它来解决一个实际问题：统一响应格式。",[1534,2353],{},[1525,2355,2357],{"id":2356},"封装统一响应格式","🛠 封装统一响应格式",[1530,2359,2360],{},"一个项目里，所有接口的返回格式应该统一，前端处理起来才省心。常见的约定是：",[1601,2362,2366],{"className":2363,"code":2364,"language":2365,"meta":1606,"style":1606},"language-json shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","{ \"code\": 0, \"data\": {}, \"message\": \"ok\" }\n","json",[1558,2367,2368],{"__ignoreMap":1606},[1610,2369,2370,2373,2376,2378,2381,2383,2386,2388,2390,2393,2395,2397,2400,2402,2405,2407,2409,2411,2414,2416],{"class":1612,"line":1613},[1610,2371,2372],{"class":1642},"{",[1610,2374,2375],{"class":1642}," \"",[1610,2377,1558],{"class":1728},[1610,2379,2380],{"class":1642},"\"",[1610,2382,1659],{"class":1642},[1610,2384,2385],{"class":1949}," 0",[1610,2387,1827],{"class":1642},[1610,2389,2375],{"class":1642},[1610,2391,2392],{"class":1728},"data",[1610,2394,2380],{"class":1642},[1610,2396,1659],{"class":1642},[1610,2398,2399],{"class":1642}," {},",[1610,2401,2375],{"class":1642},[1610,2403,2404],{"class":1728},"message",[1610,2406,2380],{"class":1642},[1610,2408,1659],{"class":1642},[1610,2410,2375],{"class":1642},[1610,2412,2413],{"class":1620},"ok",[1610,2415,2380],{"class":1642},[1610,2417,2418],{"class":1642}," }\n",[1530,2420,2421,2423],{},[1558,2422,1558],{}," 为 0 表示成功，非 0 表示失败。如果每个接口都手写这个结构太重复，把它封装成 helper 方法：",[1601,2425,2428],{"className":1633,"code":2426,"filename":2427,"language":1635,"meta":1606,"style":1606},"module.exports = {\n    // 成功响应\n    success(data = null, message = 'ok') {\n        this.ctx.body = { code: 0, data, message };\n    },\n\n    // 失败响应\n    fail(message = '操作失败', code = 1) {\n        this.ctx.body = { code, data: null, message };\n    },\n};\n","app/extend/helper.js",[1558,2429,2430,2438,2443,2472,2505,2509,2513,2518,2549,2577,2581],{"__ignoreMap":1606},[1610,2431,2432,2434,2436],{"class":1612,"line":1613},[1610,2433,1643],{"class":1642},[1610,2435,1646],{"class":1642},[1610,2437,1649],{"class":1642},[1610,2439,2440],{"class":1612,"line":1652},[1610,2441,2442],{"class":1784},"    // 成功响应\n",[1610,2444,2445,2448,2450,2453,2455,2458,2460,2462,2464,2466,2468,2470],{"class":1612,"line":1664},[1610,2446,2447],{"class":1655},"    success",[1610,2449,1799],{"class":1642},[1610,2451,2392],{"class":2452},"sK9QF",[1610,2454,1646],{"class":1642},[1610,2456,2457],{"class":1642}," null,",[1610,2459,2214],{"class":2452},[1610,2461,1646],{"class":1642},[1610,2463,1687],{"class":1642},[1610,2465,2413],{"class":1620},[1610,2467,1692],{"class":1642},[1610,2469,1877],{"class":1642},[1610,2471,1649],{"class":1642},[1610,2473,2474,2477,2479,2481,2483,2485,2487,2490,2492,2494,2496,2499,2501,2503],{"class":1612,"line":1679},[1610,2475,2476],{"class":1642},"        this.",[1610,2478,1712],{"class":1764},[1610,2480,1793],{"class":1642},[1610,2482,1930],{"class":1764},[1610,2484,1646],{"class":1642},[1610,2486,1761],{"class":1642},[1610,2488,2489],{"class":1655}," code",[1610,2491,1659],{"class":1642},[1610,2493,2385],{"class":1949},[1610,2495,1827],{"class":1642},[1610,2497,2498],{"class":1764}," data",[1610,2500,1827],{"class":1642},[1610,2502,2214],{"class":1764},[1610,2504,2226],{"class":1642},[1610,2506,2507],{"class":1612,"line":1697},[1610,2508,1700],{"class":1642},[1610,2510,2511],{"class":1612,"line":1703},[1610,2512,1779],{"emptyLinePlaceholder":1778},[1610,2514,2515],{"class":1612,"line":1805},[1610,2516,2517],{"class":1784},"    // 失败响应\n",[1610,2519,2520,2523,2525,2527,2529,2531,2534,2536,2538,2540,2542,2545,2547],{"class":1612,"line":1840},[1610,2521,2522],{"class":1655},"    fail",[1610,2524,1799],{"class":1642},[1610,2526,2404],{"class":2452},[1610,2528,1646],{"class":1642},[1610,2530,1687],{"class":1642},[1610,2532,2533],{"class":1620},"操作失败",[1610,2535,1692],{"class":1642},[1610,2537,1827],{"class":1642},[1610,2539,2489],{"class":2452},[1610,2541,1646],{"class":1642},[1610,2543,2544],{"class":1949}," 1",[1610,2546,1877],{"class":1642},[1610,2548,1649],{"class":1642},[1610,2550,2551,2553,2555,2557,2559,2561,2563,2565,2567,2569,2571,2573,2575],{"class":1612,"line":1871},[1610,2552,2476],{"class":1642},[1610,2554,1712],{"class":1764},[1610,2556,1793],{"class":1642},[1610,2558,1930],{"class":1764},[1610,2560,1646],{"class":1642},[1610,2562,1761],{"class":1642},[1610,2564,2489],{"class":1764},[1610,2566,1827],{"class":1642},[1610,2568,2498],{"class":1655},[1610,2570,1659],{"class":1642},[1610,2572,2457],{"class":1642},[1610,2574,2214],{"class":1764},[1610,2576,2226],{"class":1642},[1610,2578,2579],{"class":1612,"line":1883},[1610,2580,1700],{"class":1642},[1610,2582,2583],{"class":1612,"line":1888},[1610,2584,1706],{"class":1642},[1530,2586,2587],{},"Controller 里调用起来非常简洁：",[1601,2589,2591],{"className":1633,"code":2590,"filename":1721,"language":1635,"meta":1606,"style":1606},"class UserController extends Controller {\n    async show() {\n        const { ctx } = this;\n        const user = await ctx.service.user.findById(ctx.params.id);\n\n        if (!user) {\n            ctx.status = 404;\n            ctx.helper.fail('用户不存在');\n            return;\n        }\n\n        ctx.helper.success(user);\n    }\n}\n",[1558,2592,2593,2605,2616,2630,2673,2677,2693,2709,2736,2743,2748,2752,2773,2777],{"__ignoreMap":1606},[1610,2594,2595,2597,2599,2601,2603],{"class":1612,"line":1613},[1610,2596,1729],{"class":1728},[1610,2598,1732],{"class":1616},[1610,2600,1735],{"class":1728},[1610,2602,1738],{"class":1616},[1610,2604,1649],{"class":1642},[1610,2606,2607,2609,2612,2614],{"class":1612,"line":1652},[1610,2608,1745],{"class":1728},[1610,2610,2611],{"class":1655}," show",[1610,2613,1751],{"class":1642},[1610,2615,1649],{"class":1642},[1610,2617,2618,2620,2622,2624,2626,2628],{"class":1612,"line":1664},[1610,2619,1758],{"class":1728},[1610,2621,1761],{"class":1642},[1610,2623,1765],{"class":1764},[1610,2625,1768],{"class":1642},[1610,2627,1646],{"class":1642},[1610,2629,1773],{"class":1642},[1610,2631,2632,2634,2636,2638,2640,2642,2644,2646,2648,2650,2652,2655,2657,2659,2661,2664,2666,2669,2671],{"class":1612,"line":1679},[1610,2633,1758],{"class":1728},[1610,2635,1893],{"class":1764},[1610,2637,1646],{"class":1642},[1610,2639,1899],{"class":1898},[1610,2641,1765],{"class":1764},[1610,2643,1793],{"class":1642},[1610,2645,1906],{"class":1764},[1610,2647,1793],{"class":1642},[1610,2649,1911],{"class":1764},[1610,2651,1793],{"class":1642},[1610,2653,2654],{"class":1796},"findById",[1610,2656,1799],{"class":1655},[1610,2658,1712],{"class":1764},[1610,2660,1793],{"class":1642},[1610,2662,2663],{"class":1764},"params",[1610,2665,1793],{"class":1642},[1610,2667,2668],{"class":1764},"id",[1610,2670,1877],{"class":1655},[1610,2672,1880],{"class":1642},[1610,2674,2675],{"class":1612,"line":1697},[1610,2676,1779],{"emptyLinePlaceholder":1778},[1610,2678,2679,2682,2684,2687,2689,2691],{"class":1612,"line":1703},[1610,2680,2681],{"class":1898},"        if",[1610,2683,2176],{"class":1655},[1610,2685,2686],{"class":1642},"!",[1610,2688,1911],{"class":1764},[1610,2690,2182],{"class":1655},[1610,2692,1802],{"class":1642},[1610,2694,2695,2698,2700,2702,2704,2707],{"class":1612,"line":1805},[1610,2696,2697],{"class":1764},"            ctx",[1610,2699,1793],{"class":1642},[1610,2701,1944],{"class":1764},[1610,2703,1646],{"class":1642},[1610,2705,2706],{"class":1949}," 404",[1610,2708,1880],{"class":1642},[1610,2710,2711,2713,2715,2718,2720,2723,2725,2727,2730,2732,2734],{"class":1612,"line":1840},[1610,2712,2697],{"class":1764},[1610,2714,1793],{"class":1642},[1610,2716,2717],{"class":1764},"helper",[1610,2719,1793],{"class":1642},[1610,2721,2722],{"class":1796},"fail",[1610,2724,1799],{"class":1655},[1610,2726,1692],{"class":1642},[1610,2728,2729],{"class":1620},"用户不存在",[1610,2731,1692],{"class":1642},[1610,2733,1877],{"class":1655},[1610,2735,1880],{"class":1642},[1610,2737,2738,2741],{"class":1612,"line":1871},[1610,2739,2740],{"class":1898},"            return",[1610,2742,1880],{"class":1642},[1610,2744,2745],{"class":1612,"line":1883},[1610,2746,2747],{"class":1642},"        }\n",[1610,2749,2750],{"class":1612,"line":1888},[1610,2751,1779],{"emptyLinePlaceholder":1778},[1610,2753,2754,2756,2758,2760,2762,2765,2767,2769,2771],{"class":1612,"line":1937},[1610,2755,1790],{"class":1764},[1610,2757,1793],{"class":1642},[1610,2759,2717],{"class":1764},[1610,2761,1793],{"class":1642},[1610,2763,2764],{"class":1796},"success",[1610,2766,1799],{"class":1655},[1610,2768,1911],{"class":1764},[1610,2770,1877],{"class":1655},[1610,2772,1880],{"class":1642},[1610,2774,2775],{"class":1612,"line":1955},[1610,2776,1973],{"class":1642},[1610,2778,2779],{"class":1612,"line":1970},[1610,2780,1979],{"class":1642},[2782,2783,2784],"tip",{},[1530,2785,2786,2787,2790,2791,2794],{},"在 extend 文件的方法里，",[1558,2788,2789],{},"this"," 指向被扩展的对象本身。helper 中通过 ",[1558,2792,2793],{},"this.ctx"," 就能拿到上下文，设置响应、读取配置都没问题。",[1534,2796],{},[1525,2798,2800],{"id":2799},"扩展-context-示例","🛠 扩展 context 示例",[1530,2802,2803,2804,2806,2807,2810],{},"再给 ",[1558,2805,1712],{}," 扩展一个实用方法：判断当前请求是不是 Ajax 请求。新建 ",[1558,2808,2809],{},"app/extend/context.js","：",[1601,2812,2814],{"className":1633,"code":2813,"filename":2809,"language":1635,"meta":1606,"style":1606},"module.exports = {\n    // getter 写法：使用时像访问属性一样 ctx.isAjax\n    get isAjax() {\n        return this.get('X-Requested-With') === 'XMLHttpRequest';\n    },\n};\n",[1558,2815,2816,2824,2829,2841,2874,2878],{"__ignoreMap":1606},[1610,2817,2818,2820,2822],{"class":1612,"line":1613},[1610,2819,1643],{"class":1642},[1610,2821,1646],{"class":1642},[1610,2823,1649],{"class":1642},[1610,2825,2826],{"class":1612,"line":1652},[1610,2827,2828],{"class":1784},"    // getter 写法：使用时像访问属性一样 ctx.isAjax\n",[1610,2830,2831,2834,2837,2839],{"class":1612,"line":1664},[1610,2832,2833],{"class":1728},"    get",[1610,2835,2836],{"class":1655}," isAjax",[1610,2838,1751],{"class":1642},[1610,2840,1649],{"class":1642},[1610,2842,2843,2845,2848,2851,2853,2855,2858,2860,2862,2865,2867,2870,2872],{"class":1612,"line":1679},[1610,2844,2231],{"class":1898},[1610,2846,2847],{"class":1642}," this.",[1610,2849,2850],{"class":1796},"get",[1610,2852,1799],{"class":1655},[1610,2854,1692],{"class":1642},[1610,2856,2857],{"class":1620},"X-Requested-With",[1610,2859,1692],{"class":1642},[1610,2861,2182],{"class":1655},[1610,2863,2864],{"class":1642},"===",[1610,2866,1687],{"class":1642},[1610,2868,2869],{"class":1620},"XMLHttpRequest",[1610,2871,1692],{"class":1642},[1610,2873,1880],{"class":1642},[1610,2875,2876],{"class":1612,"line":1697},[1610,2877,1700],{"class":1642},[1610,2879,2880],{"class":1612,"line":1703},[1610,2881,1706],{"class":1642},[1530,2883,2884,2885,2888],{},"之后在任何 Controller、Service 里都能直接用 ",[1558,2886,2887],{},"ctx.isAjax","。可以看到，extend 的写法就是导出一个普通对象，Egg 会把它合并到对应对象上。",[1534,2890],{},[1525,2892,2894],{"id":2893},"小节总结","🧾 小节总结",[2896,2897,2898,2903,2915,2921,2933],"ul",{},[1555,2899,2900,2901,1568],{},"Egg 的能力大量通过插件提供，安装后在 ",[1558,2902,1567],{},[1555,2904,2905,2907,2908,2911,2912,2914],{},[1558,2906,1587],{}," 提供 ",[1558,2909,2910],{},"ctx.validate"," 方法，用声明式规则校验参数，失败抛出 422，可用 ",[1558,2913,2045],{}," 自定义错误返回。",[1555,2916,2917,2918,2920],{},"extend 用于给框架内置对象扩展方法，文件放在 ",[1558,2919,2267],{}," 下，按文件名对应扩展对象。",[1555,2922,2923,2924,2926,2927,2929,2930,2932],{},"用 ",[1558,2925,2427],{}," 封装 ",[1558,2928,2764],{}," / ",[1558,2931,2722],{},"，可以让全项目的响应格式统一。",[1555,2934,2935,2936,2938,2939,2941],{},"extend 方法中的 ",[1558,2937,2789],{}," 指向被扩展的对象，helper 里用 ",[1558,2940,2793],{}," 访问上下文。",[1534,2943],{},[1525,2945,2947],{"id":2946},"知识问答","❓ 知识问答",[1530,2949,2950],{},[1544,2951,2952],{},"Q1：插件和中间件有什么区别？",[1530,2954,2955],{},"中间件只处理请求链条上的一环；插件是一个完整的功能包，可以包含中间件、extend、配置、定时任务等多种内容。可以理解为：插件是更大的组织单位。",[1530,2957,2958],{},[1544,2959,2960],{},"Q2：ctx.validate 校验的是哪份数据？",[1530,2962,2963,2964,2967,2968,2971],{},"默认校验 ",[1558,2965,2966],{},"ctx.request.body","。想校验其他数据可以传第二个参数，例如 ",[1558,2969,2970],{},"ctx.validate(rules, ctx.query)","。",[1530,2973,2974],{},[1544,2975,2976],{},"Q3：extend 定义的方法名会和框架自带方法冲突吗？",[1530,2978,2979,2980,2982,2983,2985,2986,2982,2988,2990],{},"会的，同名会覆盖框架原有方法，容易引发隐蔽问题。起名时尽量用业务相关的名字，如 ",[1558,2981,2764],{},"、",[1558,2984,2722],{},"，避开 ",[1558,2987,1930],{},[1558,2989,1944],{}," 这类已有属性。",[1530,2992,2993],{},[1544,2994,2995],{},"Q4：helper 和 Service 都能封装逻辑，怎么选？",[1530,2997,2998],{},"Service 封装的是业务逻辑（和数据、规则相关），helper 封装的是和请求响应相关的工具方法（如格式化输出、统一响应）。拿不准时，业务归 Service，展示辅助归 helper。",[1534,3000],{},[1525,3002,3004],{"id":3003},"小练习","🧪 小练习",[1552,3006,3007],{},[1555,3008,3009,3010,3013,3014,3017],{},"在 helper 中新增一个 ",[1558,3011,3012],{},"page(list, total)"," 方法，返回 ",[1558,3015,3016],{},"{ code: 0, data: { list, total }, message: 'ok' }"," 的分页格式。",[1601,3019,3021],{"className":1633,"code":3020,"filename":2427,"language":1635,"meta":1606,"style":1606},"module.exports = {\n    // success、fail 保持原有实现\n\n    page(list, total) {\n        // 请在这里编写代码\n    },\n};\n",[1558,3022,3023,3031,3036,3040,3059,3064,3068],{"__ignoreMap":1606},[1610,3024,3025,3027,3029],{"class":1612,"line":1613},[1610,3026,1643],{"class":1642},[1610,3028,1646],{"class":1642},[1610,3030,1649],{"class":1642},[1610,3032,3033],{"class":1612,"line":1652},[1610,3034,3035],{"class":1784},"    // success、fail 保持原有实现\n",[1610,3037,3038],{"class":1612,"line":1664},[1610,3039,1779],{"emptyLinePlaceholder":1778},[1610,3041,3042,3045,3047,3050,3052,3055,3057],{"class":1612,"line":1679},[1610,3043,3044],{"class":1655},"    page",[1610,3046,1799],{"class":1642},[1610,3048,3049],{"class":2452},"list",[1610,3051,1827],{"class":1642},[1610,3053,3054],{"class":2452}," total",[1610,3056,1877],{"class":1642},[1610,3058,1649],{"class":1642},[1610,3060,3061],{"class":1612,"line":1697},[1610,3062,3063],{"class":1784},"        // 请在这里编写代码\n",[1610,3065,3066],{"class":1612,"line":1703},[1610,3067,1700],{"class":1642},[1610,3069,3070],{"class":1612,"line":1805},[1610,3071,1706],{"class":1642},[1552,3073,3074],{"start":1652},[1555,3075,3076,3077,3079,3080,3083,3084,3087,3088,3091],{},"给 ",[1558,3078,1916],{}," 接口加上校验规则：",[1558,3081,3082],{},"name"," 长度在 2 到 10 之间（提示：规则支持 ",[1558,3085,3086],{},"min"," 和 ",[1558,3089,3090],{},"max","）。",[1601,3093,3095],{"className":1633,"code":3094,"filename":1721,"language":1635,"meta":1606,"style":1606},"ctx.validate({\n    // 请在这里编写代码\n});\n",[1558,3096,3097,3109,3114],{"__ignoreMap":1606},[1610,3098,3099,3101,3103,3105,3107],{"class":1612,"line":1613},[1610,3100,1712],{"class":1764},[1610,3102,1793],{"class":1642},[1610,3104,1716],{"class":1796},[1610,3106,1799],{"class":1764},[1610,3108,1802],{"class":1642},[1610,3110,3111],{"class":1612,"line":1652},[1610,3112,3113],{"class":1784},"    // 请在这里编写代码\n",[1610,3115,3116,3119,3121],{"class":1612,"line":1664},[1610,3117,3118],{"class":1642},"}",[1610,3120,1877],{"class":1764},[1610,3122,1880],{"class":1642},[1534,3124],{},[1530,3126,3127],{},"🎉 恭喜你已经掌握插件与扩展的用法啦！下一篇是综合实战：用前面学过的全部知识，实现一个完整的用户管理 RESTful 接口。",[3129,3130,3131],"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: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html 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封装统一响应格式。","md",null,{},{"title":1237},{"title":1237,"description":3143},"mTZ6kEXGLI",[3151,3153],{"title":1233,"path":1234,"stem":1235,"description":3152,"children":-1},"掌握 Egg.js 的配置文件写法、环境区分方式，学会编写并挂载自定义中间件，了解内置安全机制。",{"title":1209,"path":1241,"stem":1242,"description":3154,"children":-1},"综合运用路由、Controller、Service、参数校验与统一响应格式，完成一个完整的用户管理 RESTful 接口。",1784715110764]