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",[1562,1703,1704],{},"http://127.0.0.1:7001","，页面会显示 ",[1562,1707,1708],{},"hi, egg",[1556,1710,1711],{},[1531,1712,1713,1716,1717,1568],{},[1562,1714,1715],{},"npm run dev"," 启动的是开发模式，修改代码后会自动重启服务，不用手动停掉再启动。默认端口是 ",[1544,1718,1719],{},"7001",[1535,1721],{},[1526,1723,1725],{"id":1724},"认识目录结构","🧱 认识目录结构",[1531,1727,1728],{},"打开生成的项目，先看几个核心目录和文件：",[1627,1730,1732],{"className":1629,"code":1731,"language":1631,"meta":1632,"style":1632},"egg-example\n├── app\n│   ├── router.js          # 路由：定义 URL 和处理逻辑的对应关系\n│   ├── controller         # 控制器：接收请求、返回响应\n│   ├── service            # 业务逻辑层：处理具体业务和数据\n│   ├── middleware         # 自定义中间件\n│   └── extend             # 框架扩展：给内置对象添加方法\n├── config\n│   ├── config.default.js  # 默认配置\n│   └── plugin.js          # 插件配置\n└── package.json\n",[1562,1733,1734,1739,1747,1763,1776,1789,1802,1816,1824,1837,1850],{"__ignoreMap":1632},[1636,1735,1736],{"class":1638,"line":1639},[1636,1737,1738],{"class":1642},"egg-example\n",[1636,1740,1741,1744],{"class":1638,"line":1686},[1636,1742,1743],{"class":1642},"├──",[1636,1745,1746],{"class":1646}," app\n",[1636,1748,1750,1753,1756,1759],{"class":1638,"line":1749},3,[1636,1751,1752],{"class":1642},"│",[1636,1754,1755],{"class":1646},"   ├──",[1636,1757,1758],{"class":1646}," router.js",[1636,1760,1762],{"class":1761},"syuKq","          # 路由：定义 URL 和处理逻辑的对应关系\n",[1636,1764,1766,1768,1770,1773],{"class":1638,"line":1765},4,[1636,1767,1752],{"class":1642},[1636,1769,1755],{"class":1646},[1636,1771,1772],{"class":1646}," controller",[1636,1774,1775],{"class":1761},"         # 控制器：接收请求、返回响应\n",[1636,1777,1779,1781,1783,1786],{"class":1638,"line":1778},5,[1636,1780,1752],{"class":1642},[1636,1782,1755],{"class":1646},[1636,1784,1785],{"class":1646}," service",[1636,1787,1788],{"class":1761},"            # 业务逻辑层：处理具体业务和数据\n",[1636,1790,1792,1794,1796,1799],{"class":1638,"line":1791},6,[1636,1793,1752],{"class":1642},[1636,1795,1755],{"class":1646},[1636,1797,1798],{"class":1646}," middleware",[1636,1800,1801],{"class":1761},"         # 自定义中间件\n",[1636,1803,1805,1807,1810,1813],{"class":1638,"line":1804},7,[1636,1806,1752],{"class":1642},[1636,1808,1809],{"class":1646},"   └──",[1636,1811,1812],{"class":1646}," extend",[1636,1814,1815],{"class":1761},"             # 框架扩展：给内置对象添加方法\n",[1636,1817,1819,1821],{"class":1638,"line":1818},8,[1636,1820,1743],{"class":1642},[1636,1822,1823],{"class":1646}," config\n",[1636,1825,1827,1829,1831,1834],{"class":1638,"line":1826},9,[1636,1828,1752],{"class":1642},[1636,1830,1755],{"class":1646},[1636,1832,1833],{"class":1646}," config.default.js",[1636,1835,1836],{"class":1761},"  # 默认配置\n",[1636,1838,1840,1842,1844,1847],{"class":1638,"line":1839},10,[1636,1841,1752],{"class":1642},[1636,1843,1809],{"class":1646},[1636,1845,1846],{"class":1646}," plugin.js",[1636,1848,1849],{"class":1761},"          # 插件配置\n",[1636,1851,1853,1856],{"class":1638,"line":1852},11,[1636,1854,1855],{"class":1642},"└──",[1636,1857,1858],{"class":1646}," package.json\n",[1531,1860,1861,1862,1865],{},"这就是“约定优于配置”的直接体现：文件放在约定位置、按约定方式导出，Egg 启动时会自动加载它们，不需要手动 ",[1562,1863,1864],{},"require"," 组装。",[1535,1867],{},[1526,1869,1871],{"id":1870},"第一个接口","🛠 第一个接口",[1531,1873,1874,1875,1878],{},"脚手架自带了一个示例。打开 ",[1562,1876,1877],{},"app/controller/home.js","：",[1627,1880,1884],{"className":1881,"code":1882,"filename":1877,"language":1883,"meta":1632,"style":1632},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const { Controller } = require('egg');\n\nclass HomeController extends Controller {\n    async index() {\n        const { ctx } = this;\n        ctx.body = 'hi, egg';\n    }\n}\n\nmodule.exports = HomeController;\n","js",[1562,1885,1886,1926,1932,1949,1963,1981,2003,2008,2013,2017],{"__ignoreMap":1632},[1636,1887,1888,1892,1896,1900,1903,1906,1909,1912,1915,1918,1920,1923],{"class":1638,"line":1639},[1636,1889,1891],{"class":1890},"s50WR","const",[1636,1893,1895],{"class":1894},"s86vT"," {",[1636,1897,1899],{"class":1898},"sndM8"," Controller ",[1636,1901,1902],{"class":1894},"}",[1636,1904,1905],{"class":1894}," =",[1636,1907,1908],{"class":1679}," require",[1636,1910,1911],{"class":1898},"(",[1636,1913,1914],{"class":1894},"'",[1636,1916,1917],{"class":1646},"egg",[1636,1919,1914],{"class":1894},[1636,1921,1922],{"class":1898},")",[1636,1924,1925],{"class":1894},";\n",[1636,1927,1928],{"class":1638,"line":1686},[1636,1929,1931],{"emptyLinePlaceholder":1930},true,"\n",[1636,1933,1934,1937,1940,1943,1946],{"class":1638,"line":1749},[1636,1935,1936],{"class":1890},"class",[1636,1938,1939],{"class":1642}," HomeController",[1636,1941,1942],{"class":1890}," extends",[1636,1944,1945],{"class":1642}," Controller",[1636,1947,1948],{"class":1894}," {\n",[1636,1950,1951,1954,1958,1961],{"class":1638,"line":1765},[1636,1952,1953],{"class":1890},"    async",[1636,1955,1957],{"class":1956},"sd2Uz"," index",[1636,1959,1960],{"class":1894},"()",[1636,1962,1948],{"class":1894},[1636,1964,1965,1968,1970,1973,1976,1978],{"class":1638,"line":1778},[1636,1966,1967],{"class":1890},"        const",[1636,1969,1895],{"class":1894},[1636,1971,1972],{"class":1898}," ctx",[1636,1974,1975],{"class":1894}," }",[1636,1977,1905],{"class":1894},[1636,1979,1980],{"class":1894}," this;\n",[1636,1982,1983,1986,1989,1992,1994,1997,1999,2001],{"class":1638,"line":1791},[1636,1984,1985],{"class":1898},"        ctx",[1636,1987,1988],{"class":1894},".",[1636,1990,1991],{"class":1898},"body",[1636,1993,1905],{"class":1894},[1636,1995,1996],{"class":1894}," '",[1636,1998,1708],{"class":1646},[1636,2000,1914],{"class":1894},[1636,2002,1925],{"class":1894},[1636,2004,2005],{"class":1638,"line":1804},[1636,2006,2007],{"class":1894},"    }\n",[1636,2009,2010],{"class":1638,"line":1818},[1636,2011,2012],{"class":1894},"}\n",[1636,2014,2015],{"class":1638,"line":1826},[1636,2016,1931],{"emptyLinePlaceholder":1930},[1636,2018,2019,2022,2024,2026],{"class":1638,"line":1839},[1636,2020,2021],{"class":1894},"module.exports",[1636,2023,1905],{"class":1894},[1636,2025,1939],{"class":1898},[1636,2027,1925],{"class":1894},[1531,2029,2030,2031,1878],{},"再看路由 ",[1562,2032,2033],{},"app/router.js",[1627,2035,2037],{"className":1881,"code":2036,"filename":2033,"language":1883,"meta":1632,"style":1632},"module.exports = app => {\n    const { router, controller } = app;\n    router.get('/', controller.home.index);\n};\n",[1562,2038,2039,2054,2077,2114],{"__ignoreMap":1632},[1636,2040,2041,2043,2045,2049,2052],{"class":1638,"line":1639},[1636,2042,2021],{"class":1894},[1636,2044,1905],{"class":1894},[1636,2046,2048],{"class":2047},"sK9QF"," app",[1636,2050,2051],{"class":1890}," =>",[1636,2053,1948],{"class":1894},[1636,2055,2056,2059,2061,2064,2067,2069,2071,2073,2075],{"class":1638,"line":1686},[1636,2057,2058],{"class":1890},"    const",[1636,2060,1895],{"class":1894},[1636,2062,2063],{"class":1898}," router",[1636,2065,2066],{"class":1894},",",[1636,2068,1772],{"class":1898},[1636,2070,1975],{"class":1894},[1636,2072,1905],{"class":1894},[1636,2074,2048],{"class":1898},[1636,2076,1925],{"class":1894},[1636,2078,2079,2082,2084,2087,2089,2091,2094,2096,2098,2100,2102,2105,2107,2110,2112],{"class":1638,"line":1749},[1636,2080,2081],{"class":1898},"    router",[1636,2083,1988],{"class":1894},[1636,2085,2086],{"class":1679},"get",[1636,2088,1911],{"class":1956},[1636,2090,1914],{"class":1894},[1636,2092,2093],{"class":1646},"/",[1636,2095,1914],{"class":1894},[1636,2097,2066],{"class":1894},[1636,2099,1772],{"class":1898},[1636,2101,1988],{"class":1894},[1636,2103,2104],{"class":1898},"home",[1636,2106,1988],{"class":1894},[1636,2108,2109],{"class":1898},"index",[1636,2111,1922],{"class":1956},[1636,2113,1925],{"class":1894},[1636,2115,2116],{"class":1638,"line":1765},[1636,2117,2118],{"class":1894},"};\n",[1531,2120,2121,2122,2125,2126,2128,2129,2131,2132,2135],{},"两处配合的含义是：访问 ",[1562,2123,2124],{},"GET /"," 时，交给 ",[1562,2127,1877],{}," 里的 ",[1562,2130,2109],{}," 方法处理，用 ",[1562,2133,2134],{},"ctx.body"," 返回内容。",[1531,2137,2138],{},"我们把它改成一个 JSON 接口试试：",[1627,2140,2142],{"className":1881,"code":2141,"filename":1877,"language":1883,"meta":1632,"style":1632},"const { Controller } = require('egg');\n\nclass HomeController extends Controller {\n    async index() {\n        const { ctx } = this;\n        ctx.body = {\n            message: '你好，Egg.js',\n        };\n    }\n}\n\nmodule.exports = HomeController;\n",[1562,2143,2144,2170,2174,2186,2196,2210,2222,2240,2245,2249,2253,2257],{"__ignoreMap":1632},[1636,2145,2146,2148,2150,2152,2154,2156,2158,2160,2162,2164,2166,2168],{"class":1638,"line":1639},[1636,2147,1891],{"class":1890},[1636,2149,1895],{"class":1894},[1636,2151,1899],{"class":1898},[1636,2153,1902],{"class":1894},[1636,2155,1905],{"class":1894},[1636,2157,1908],{"class":1679},[1636,2159,1911],{"class":1898},[1636,2161,1914],{"class":1894},[1636,2163,1917],{"class":1646},[1636,2165,1914],{"class":1894},[1636,2167,1922],{"class":1898},[1636,2169,1925],{"class":1894},[1636,2171,2172],{"class":1638,"line":1686},[1636,2173,1931],{"emptyLinePlaceholder":1930},[1636,2175,2176,2178,2180,2182,2184],{"class":1638,"line":1749},[1636,2177,1936],{"class":1890},[1636,2179,1939],{"class":1642},[1636,2181,1942],{"class":1890},[1636,2183,1945],{"class":1642},[1636,2185,1948],{"class":1894},[1636,2187,2188,2190,2192,2194],{"class":1638,"line":1765},[1636,2189,1953],{"class":1890},[1636,2191,1957],{"class":1956},[1636,2193,1960],{"class":1894},[1636,2195,1948],{"class":1894},[1636,2197,2198,2200,2202,2204,2206,2208],{"class":1638,"line":1778},[1636,2199,1967],{"class":1890},[1636,2201,1895],{"class":1894},[1636,2203,1972],{"class":1898},[1636,2205,1975],{"class":1894},[1636,2207,1905],{"class":1894},[1636,2209,1980],{"class":1894},[1636,2211,2212,2214,2216,2218,2220],{"class":1638,"line":1791},[1636,2213,1985],{"class":1898},[1636,2215,1988],{"class":1894},[1636,2217,1991],{"class":1898},[1636,2219,1905],{"class":1894},[1636,2221,1948],{"class":1894},[1636,2223,2224,2227,2230,2232,2235,2237],{"class":1638,"line":1804},[1636,2225,2226],{"class":1956},"            message",[1636,2228,2229],{"class":1894},":",[1636,2231,1996],{"class":1894},[1636,2233,2234],{"class":1646},"你好，Egg.js",[1636,2236,1914],{"class":1894},[1636,2238,2239],{"class":1894},",\n",[1636,2241,2242],{"class":1638,"line":1818},[1636,2243,2244],{"class":1894},"        };\n",[1636,2246,2247],{"class":1638,"line":1826},[1636,2248,2007],{"class":1894},[1636,2250,2251],{"class":1638,"line":1839},[1636,2252,2012],{"class":1894},[1636,2254,2255],{"class":1638,"line":1852},[1636,2256,1931],{"emptyLinePlaceholder":1930},[1636,2258,2260,2262,2264,2266],{"class":1638,"line":2259},12,[1636,2261,2021],{"class":1894},[1636,2263,1905],{"class":1894},[1636,2265,1939],{"class":1898},[1636,2267,1925],{"class":1894},[1531,2269,2270,2271,2273,2274,1568],{},"保存后刷新浏览器，就能看到返回的 JSON 了。给 ",[1562,2272,2134],{}," 赋一个对象，Egg 会自动转成 JSON 返回，不用手动设置 ",[1562,2275,2276],{},"Content-Type",[1662,2278,2279],{},[1531,2280,2281,2282,2284,2285,2287],{},"Egg 官方示例使用 CommonJS 写法（",[1562,2283,1864],{}," + ",[1562,2286,2021],{},"），这是框架的约定。前面课程用的是 ESM，风格不同属正常现象，写 Egg 代码时跟随官方惯例即可。",[1535,2289],{},[1526,2291,2293],{"id":2292},"小节总结","🧾 小节总结",[1582,2295,2296,2299,2302,2312,2330],{},[1585,2297,2298],{},"Egg.js 是基于 Koa 的 Node.js 框架，由阿里巴巴团队开源，核心理念是约定优于配置。",[1585,2300,2301],{},"相比 Express、Koa 的自由灵活，Egg 用统一约定换取团队协作的一致性，并内置了安全、日志等常用能力。",[1585,2303,2304,2305,2308,2309,2311],{},"用 ",[1562,2306,2307],{},"npm init egg --type=simple"," 创建项目，",[1562,2310,1715],{}," 启动，默认端口 7001。",[1585,2313,2314,2315,2317,2318,2321,2322,2325,2326,2329],{},"核心目录：",[1562,2316,2033],{}," 配路由，",[1562,2319,2320],{},"app/controller"," 处理请求，",[1562,2323,2324],{},"app/service"," 写业务逻辑，",[1562,2327,2328],{},"config"," 放配置。",[1585,2331,2332,2333,2335],{},"给 ",[1562,2334,2134],{}," 赋值即可返回响应，赋对象会自动转成 JSON。",[1535,2337],{},[1526,2339,2341],{"id":2340},"知识问答","❓ 知识问答",[1531,2343,2344],{},[1544,2345,2346],{},"Q1：Egg.js 和 Koa 是什么关系？",[1531,2348,2349,2350,2352],{},"Egg 底层基于 Koa，可以把它理解为“定好规范、装好配件的 Koa”。Koa 的 ",[1562,2351,1564],{},"、中间件、洋葱模型在 Egg 里都适用。",[1531,2354,2355],{},[1544,2356,2357],{},"Q2：学会 Express 或 Koa 了，还有必要学 Egg 吗？",[1531,2359,2360],{},"小项目用 Express、Koa 很顺手；多人协作的中大型项目里，Egg 的统一约定能减少大量沟通成本。企业招聘中 Egg 也是常见要求之一。",[1531,2362,2363],{},[1544,2364,2365],{},"Q3：为什么 Egg 代码用 CommonJS 而不是 ESM？",[1531,2367,2368,2369,2371,2372,2374],{},"这是 Egg 官方的历史约定，框架的自动加载机制基于 CommonJS 实现。跟随官方示例用 ",[1562,2370,1864],{}," 和 ",[1562,2373,2021],{}," 即可，不影响学习。",[1531,2376,2377],{},[1544,2378,2379],{},"Q4：改了代码需要重启服务吗？",[1531,2381,2382,2384],{},[1562,2383,1715],{}," 启动的开发模式会监听文件变化并自动重启，保存文件后直接刷新浏览器即可。",[1535,2386],{},[1526,2388,2390],{"id":2389},"小练习","🧪 小练习",[1531,2392,2393,2394,2397,2398,2401,2402,2405,2406,2409],{},"在 ",[1562,2395,2396],{},"home.js"," 中新增一个 ",[1562,2399,2400],{},"info"," 方法，返回你的姓名和学习日期，并在 ",[1562,2403,2404],{},"router.js"," 中把它挂到 ",[1562,2407,2408],{},"GET /info"," 上。",[1627,2411,2413],{"className":1881,"code":2412,"filename":1877,"language":1883,"meta":1632,"style":1632},"class HomeController extends Controller {\n    async index() {\n        // 原有代码保持不变\n    }\n\n    async info() {\n        const { ctx } = this;\n        // 请在这里编写代码\n    }\n}\n",[1562,2414,2415,2427,2437,2442,2446,2450,2461,2475,2480,2484],{"__ignoreMap":1632},[1636,2416,2417,2419,2421,2423,2425],{"class":1638,"line":1639},[1636,2418,1936],{"class":1890},[1636,2420,1939],{"class":1642},[1636,2422,1942],{"class":1890},[1636,2424,1945],{"class":1642},[1636,2426,1948],{"class":1894},[1636,2428,2429,2431,2433,2435],{"class":1638,"line":1686},[1636,2430,1953],{"class":1890},[1636,2432,1957],{"class":1956},[1636,2434,1960],{"class":1894},[1636,2436,1948],{"class":1894},[1636,2438,2439],{"class":1638,"line":1749},[1636,2440,2441],{"class":1761},"        // 原有代码保持不变\n",[1636,2443,2444],{"class":1638,"line":1765},[1636,2445,2007],{"class":1894},[1636,2447,2448],{"class":1638,"line":1778},[1636,2449,1931],{"emptyLinePlaceholder":1930},[1636,2451,2452,2454,2457,2459],{"class":1638,"line":1791},[1636,2453,1953],{"class":1890},[1636,2455,2456],{"class":1956}," info",[1636,2458,1960],{"class":1894},[1636,2460,1948],{"class":1894},[1636,2462,2463,2465,2467,2469,2471,2473],{"class":1638,"line":1804},[1636,2464,1967],{"class":1890},[1636,2466,1895],{"class":1894},[1636,2468,1972],{"class":1898},[1636,2470,1975],{"class":1894},[1636,2472,1905],{"class":1894},[1636,2474,1980],{"class":1894},[1636,2476,2477],{"class":1638,"line":1818},[1636,2478,2479],{"class":1761},"        // 请在这里编写代码\n",[1636,2481,2482],{"class":1638,"line":1826},[1636,2483,2007],{"class":1894},[1636,2485,2486],{"class":1638,"line":1839},[1636,2487,2012],{"class":1894},[1627,2489,2491],{"className":1881,"code":2490,"filename":2033,"language":1883,"meta":1632,"style":1632},"module.exports = app => {\n    const { router, controller } = app;\n    router.get('/', controller.home.index);\n    // 请在这里编写代码\n};\n",[1562,2492,2493,2505,2525,2557,2562],{"__ignoreMap":1632},[1636,2494,2495,2497,2499,2501,2503],{"class":1638,"line":1639},[1636,2496,2021],{"class":1894},[1636,2498,1905],{"class":1894},[1636,2500,2048],{"class":2047},[1636,2502,2051],{"class":1890},[1636,2504,1948],{"class":1894},[1636,2506,2507,2509,2511,2513,2515,2517,2519,2521,2523],{"class":1638,"line":1686},[1636,2508,2058],{"class":1890},[1636,2510,1895],{"class":1894},[1636,2512,2063],{"class":1898},[1636,2514,2066],{"class":1894},[1636,2516,1772],{"class":1898},[1636,2518,1975],{"class":1894},[1636,2520,1905],{"class":1894},[1636,2522,2048],{"class":1898},[1636,2524,1925],{"class":1894},[1636,2526,2527,2529,2531,2533,2535,2537,2539,2541,2543,2545,2547,2549,2551,2553,2555],{"class":1638,"line":1749},[1636,2528,2081],{"class":1898},[1636,2530,1988],{"class":1894},[1636,2532,2086],{"class":1679},[1636,2534,1911],{"class":1956},[1636,2536,1914],{"class":1894},[1636,2538,2093],{"class":1646},[1636,2540,1914],{"class":1894},[1636,2542,2066],{"class":1894},[1636,2544,1772],{"class":1898},[1636,2546,1988],{"class":1894},[1636,2548,2104],{"class":1898},[1636,2550,1988],{"class":1894},[1636,2552,2109],{"class":1898},[1636,2554,1922],{"class":1956},[1636,2556,1925],{"class":1894},[1636,2558,2559],{"class":1638,"line":1765},[1636,2560,2561],{"class":1761},"    // 请在这里编写代码\n",[1636,2563,2564],{"class":1638,"line":1778},[1636,2565,2118],{"class":1894},[1535,2567],{},[1531,2569,2570],{},"🎉 恭喜你已经跑通了第一个 Egg.js 项目！下一篇我们深入学习路由与 Controller，看看如何接收各种请求参数并返回规范的响应。",[2572,2573,2574],"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: 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.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}",{"title":1632,"searchDepth":1686,"depth":1686,"links":2576},[2577,2578,2579,2580,2581,2582,2583,2584,2585],{"id":1528,"depth":1686,"text":1529},{"id":1539,"depth":1686,"text":1540},{"id":1573,"depth":1686,"text":1574},{"id":1610,"depth":1686,"text":1611},{"id":1724,"depth":1686,"text":1725},{"id":1870,"depth":1686,"text":1871},{"id":2292,"depth":1686,"text":2293},{"id":2340,"depth":1686,"text":2341},{"id":2389,"depth":1686,"text":2390},"了解 Egg.js 是什么、为什么选择它，学会用脚手架创建项目并跑通第一个接口。","md",null,{},{"title":1219},{"title":1521,"description":2586},"yBvZSazXml",[2594,2596],{"title":1209,"path":1210,"stem":1211,"description":2595,"children":-1},"综合运用 @koa/router、koa-bodyparser、@koa/cors 与错误处理，实现一套完整的用户增删改查接口。",{"title":1225,"path":1226,"stem":1227,"description":2597,"children":-1},"掌握 Egg.js 的路由定义、Controller 写法、请求参数获取与响应返回，理解 Controller 的职责定位。",1784715105014]