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material-theme-lighter material-theme material-theme-palenight","const { Service } = require('egg');\n\nclass UserService extends Service {\n    async findAll() {\n        // 先用固定数据模拟，后面会换成真实数据操作\n        return [\n            { id: 1, name: '小明', age: 18 },\n            { id: 2, name: '小红', age: 20 },\n        ];\n    }\n}\n\nmodule.exports = UserService;\n","app/service/user.js","js","",[1535,1610,1611,1656,1663,1682,1697,1704,1714,1759,1795,1803,1809,1815,1820],{"__ignoreMap":1608},[1612,1613,1616,1620,1624,1628,1631,1634,1638,1641,1644,1648,1650,1653],"span",{"class":1614,"line":1615},"line",1,[1612,1617,1619],{"class":1618},"s50WR","const",[1612,1621,1623],{"class":1622},"s86vT"," {",[1612,1625,1627],{"class":1626},"sndM8"," Service ",[1612,1629,1630],{"class":1622},"}",[1612,1632,1633],{"class":1622}," =",[1612,1635,1637],{"class":1636},"swgpB"," 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先用固定数据模拟，后面会换成真实数据操作\n",[1612,1705,1707,1711],{"class":1614,"line":1706},6,[1612,1708,1710],{"class":1709},"s8pZq","        return",[1612,1712,1713],{"class":1690}," [\n",[1612,1715,1717,1720,1723,1726,1730,1733,1736,1738,1741,1744,1746,1748,1751,1753,1756],{"class":1614,"line":1716},7,[1612,1718,1719],{"class":1622},"            {",[1612,1721,1722],{"class":1690}," id",[1612,1724,1725],{"class":1622},":",[1612,1727,1729],{"class":1728},"smPcV"," 1",[1612,1731,1732],{"class":1622},",",[1612,1734,1735],{"class":1690}," name",[1612,1737,1725],{"class":1622},[1612,1739,1740],{"class":1622}," '",[1612,1742,1743],{"class":1646},"小明",[1612,1745,1643],{"class":1622},[1612,1747,1732],{"class":1622},[1612,1749,1750],{"class":1690}," age",[1612,1752,1725],{"class":1622},[1612,1754,1755],{"class":1728}," 18",[1612,1757,1758],{"class":1622}," },\n",[1612,1760,1762,1764,1766,1768,1771,1773,1775,1777,1779,1782,1784,1786,1788,1790,1793],{"class":1614,"line":1761},8,[1612,1763,1719],{"class":1622},[1612,1765,1722],{"class":1690},[1612,1767,1725],{"class":1622},[1612,1769,1770],{"class":1728}," 2",[1612,1772,1732],{"class":1622},[1612,1774,1735],{"class":1690},[1612,1776,1725],{"class":1622},[1612,1778,1740],{"class":1622},[1612,1780,1781],{"class":1646},"小红",[1612,1783,1643],{"class":1622},[1612,1785,1732],{"class":1622},[1612,1787,1750],{"class":1690},[1612,1789,1725],{"class":1622},[1612,1791,1792],{"class":1728}," 20",[1612,1794,1758],{"class":1622},[1612,1796,1798,1801],{"class":1614,"line":1797},9,[1612,1799,1800],{"class":1690},"        ]",[1612,1802,1655],{"class":1622},[1612,1804,1806],{"class":1614,"line":1805},10,[1612,1807,1808],{"class":1622},"    }\n",[1612,1810,1812],{"class":1614,"line":1811},11,[1612,1813,1814],{"class":1622},"}\n",[1612,1816,1818],{"class":1614,"line":1817},12,[1612,1819,1662],{"emptyLinePlaceholder":1661},[1612,1821,1823,1826,1828,1830],{"class":1614,"line":1822},13,[1612,1824,1825],{"class":1622},"module.exports",[1612,1827,1633],{"class":1622},[1612,1829,1672],{"class":1626},[1612,1831,1655],{"class":1622},[1531,1833,1834,1835,1837,1838,1841,1842,1845],{},"挂载规则和 Controller 一样：",[1535,1836,1606],{}," 里的 ",[1535,1839,1840],{},"findAll"," 方法，通过 ",[1535,1843,1844],{},"ctx.service.user.findAll()"," 调用。Controller 中这样使用：",[1602,1847,1850],{"className":1604,"code":1848,"filename":1849,"language":1607,"meta":1608,"style":1608},"const { Controller } = require('egg');\n\nclass UserController extends Controller {\n    async index() {\n        const { ctx } = this;\n        const users = await ctx.service.user.findAll();\n        ctx.body = users;\n    }\n}\n\nmodule.exports = UserController;\n","app/controller/user.js",[1535,1851,1852,1879,1883,1897,1908,1926,1959,1975,1979,1983,1987],{"__ignoreMap":1608},[1612,1853,1854,1856,1858,1861,1863,1865,1867,1869,1871,1873,1875,1877],{"class":1614,"line":1615},[1612,1855,1619],{"class":1618},[1612,1857,1623],{"class":1622},[1612,1859,1860],{"class":1626}," Controller ",[1612,1862,1630],{"class":1622},[1612,1864,1633],{"class":1622},[1612,1866,1637],{"class":1636},[1612,1868,1640],{"class":1626},[1612,1870,1643],{"class":1622},[1612,1872,1647],{"class":1646},[1612,1874,1643],{"class":1622},[1612,1876,1652],{"class":1626},[1612,1878,1655],{"class":1622},[1612,1880,1881],{"class":1614,"line":1658},[1612,1882,1662],{"emptyLinePlaceholder":1661},[1612,1884,1885,1887,1890,1892,1895],{"class":1614,"line":1665},[1612,1886,1668],{"class":1618},[1612,1888,1889],{"class":1671}," UserController",[1612,1891,1675],{"class":1618},[1612,1893,1894],{"class":1671}," Controller",[1612,1896,1681],{"class":1622},[1612,1898,1899,1901,1904,1906],{"class":1614,"line":1684},[1612,1900,1687],{"class":1618},[1612,1902,1903],{"class":1690}," index",[1612,1905,1694],{"class":1622},[1612,1907,1681],{"class":1622},[1612,1909,1910,1913,1915,1918,1921,1923],{"class":1614,"line":1699},[1612,1911,1912],{"class":1618},"        const",[1612,1914,1623],{"class":1622},[1612,1916,1917],{"class":1626}," ctx",[1612,1919,1920],{"class":1622}," }",[1612,1922,1633],{"class":1622},[1612,1924,1925],{"class":1622}," this;\n",[1612,1927,1928,1930,1933,1935,1938,1940,1943,1946,1948,1951,1953,1955,1957],{"class":1614,"line":1706},[1612,1929,1912],{"class":1618},[1612,1931,1932],{"class":1626}," users",[1612,1934,1633],{"class":1622},[1612,1936,1937],{"class":1709}," await",[1612,1939,1917],{"class":1626},[1612,1941,1942],{"class":1622},".",[1612,1944,1945],{"class":1626},"service",[1612,1947,1942],{"class":1622},[1612,1949,1950],{"class":1626},"user",[1612,1952,1942],{"class":1622},[1612,1954,1840],{"class":1636},[1612,1956,1694],{"class":1690},[1612,1958,1655],{"class":1622},[1612,1960,1961,1964,1966,1969,1971,1973],{"class":1614,"line":1716},[1612,1962,1963],{"class":1626},"        ctx",[1612,1965,1942],{"class":1622},[1612,1967,1968],{"class":1626},"body",[1612,1970,1633],{"class":1622},[1612,1972,1932],{"class":1626},[1612,1974,1655],{"class":1622},[1612,1976,1977],{"class":1614,"line":1761},[1612,1978,1808],{"class":1622},[1612,1980,1981],{"class":1614,"line":1797},[1612,1982,1814],{"class":1622},[1612,1984,1985],{"class":1614,"line":1805},[1612,1986,1662],{"emptyLinePlaceholder":1661},[1612,1988,1989,1991,1993,1995],{"class":1614,"line":1811},[1612,1990,1825],{"class":1622},[1612,1992,1633],{"class":1622},[1612,1994,1889],{"class":1626},[1612,1996,1655],{"class":1622},[1531,1998,1999,2000,2003,2004,2007,2008,2011],{},"访问 ",[1535,2001,2002],{},"GET /users","，就能拿到用户列表了。在 Service 里同样可以通过 ",[1535,2005,2006],{},"this.ctx"," 访问上下文，需要时也能用 ",[1535,2009,2010],{},"this.app"," 拿到应用实例。",[1544,2013],{},[1526,2015,2017],{"id":2016},"用内存数组模拟数据操作","🛠 用内存数组模拟数据操作",[1531,2019,2020],{},"学习阶段还没接数据库，我们用一个内存数组模拟，把增删改查封装成 Service 方法：",[1602,2022,2024],{"className":1604,"code":2023,"filename":1606,"language":1607,"meta":1608,"style":1608},"const { Service } = require('egg');\n\n// 用内存数组模拟数据库：定义在模块顶层，所有请求共享，服务重启后数据还原\nconst users = [\n    { id: 1, name: '小明', age: 18 },\n    { id: 2, name: '小红', age: 20 },\n];\nlet nextId = 3;\n\nclass UserService extends Service {\n    // 查询全部\n    async findAll() {\n        return users;\n    }\n\n    // 按 id 查询单个\n    async findById(id) {\n        return users.find(item => item.id === Number(id));\n    }\n\n    // 新增\n    async create(data) {\n        const user = { id: nextId++, name: data.name, age: data.age };\n        users.push(user);\n        return user;\n    }\n\n    // 修改\n    async update(id, data) {\n        const user = await this.findById(id);\n        if (!user) return null;\n\n        if (data.name !== undefined) user.name = data.name;\n        if (data.age !== undefined) user.age = data.age;\n        return user;\n    }\n\n    // 删除\n    async remove(id) {\n        const index = users.findIndex(item => item.id === Number(id));\n        if (index === -1) return false;\n\n        users.splice(index, 1);\n        return true;\n    }\n}\n\nmodule.exports = UserService;\n",[1535,2025,2026,2052,2056,2061,2073,2106,2138,2145,2160,2164,2176,2181,2191,2199,2204,2209,2215,2233,2275,2280,2285,2291,2308,2358,2377,2386,2391,2396,2402,2422,2447,2470,2475,2512,2547,2556,2561,2566,2572,2588,2628,2656,2661,2683,2693,2698,2703,2708],{"__ignoreMap":1608},[1612,2027,2028,2030,2032,2034,2036,2038,2040,2042,2044,2046,2048,2050],{"class":1614,"line":1615},[1612,2029,1619],{"class":1618},[1612,2031,1623],{"class":1622},[1612,2033,1627],{"class":1626},[1612,2035,1630],{"class":1622},[1612,2037,1633],{"class":1622},[1612,2039,1637],{"class":1636},[1612,2041,1640],{"class":1626},[1612,2043,1643],{"class":1622},[1612,2045,1647],{"class":1646},[1612,2047,1643],{"class":1622},[1612,2049,1652],{"class":1626},[1612,2051,1655],{"class":1622},[1612,2053,2054],{"class":1614,"line":1658},[1612,2055,1662],{"emptyLinePlaceholder":1661},[1612,2057,2058],{"class":1614,"line":1665},[1612,2059,2060],{"class":1702},"// 用内存数组模拟数据库：定义在模块顶层，所有请求共享，服务重启后数据还原\n",[1612,2062,2063,2065,2068,2071],{"class":1614,"line":1684},[1612,2064,1619],{"class":1618},[1612,2066,2067],{"class":1626}," users ",[1612,2069,2070],{"class":1622},"=",[1612,2072,1713],{"class":1626},[1612,2074,2075,2078,2080,2082,2084,2086,2088,2090,2092,2094,2096,2098,2100,2102,2104],{"class":1614,"line":1699},[1612,2076,2077],{"class":1622},"    {",[1612,2079,1722],{"class":1690},[1612,2081,1725],{"class":1622},[1612,2083,1729],{"class":1728},[1612,2085,1732],{"class":1622},[1612,2087,1735],{"class":1690},[1612,2089,1725],{"class":1622},[1612,2091,1740],{"class":1622},[1612,2093,1743],{"class":1646},[1612,2095,1643],{"class":1622},[1612,2097,1732],{"class":1622},[1612,2099,1750],{"class":1690},[1612,2101,1725],{"class":1622},[1612,2103,1755],{"class":1728},[1612,2105,1758],{"class":1622},[1612,2107,2108,2110,2112,2114,2116,2118,2120,2122,2124,2126,2128,2130,2132,2134,2136],{"class":1614,"line":1706},[1612,2109,2077],{"class":1622},[1612,2111,1722],{"class":1690},[1612,2113,1725],{"class":1622},[1612,2115,1770],{"class":1728},[1612,2117,1732],{"class":1622},[1612,2119,1735],{"class":1690},[1612,2121,1725],{"class":1622},[1612,2123,1740],{"class":1622},[1612,2125,1781],{"class":1646},[1612,2127,1643],{"class":1622},[1612,2129,1732],{"class":1622},[1612,2131,1750],{"class":1690},[1612,2133,1725],{"class":1622},[1612,2135,1792],{"class":1728},[1612,2137,1758],{"class":1622},[1612,2139,2140,2143],{"class":1614,"line":1716},[1612,2141,2142],{"class":1626},"]",[1612,2144,1655],{"class":1622},[1612,2146,2147,2150,2153,2155,2158],{"class":1614,"line":1761},[1612,2148,2149],{"class":1618},"let",[1612,2151,2152],{"class":1626}," nextId ",[1612,2154,2070],{"class":1622},[1612,2156,2157],{"class":1728}," 3",[1612,2159,1655],{"class":1622},[1612,2161,2162],{"class":1614,"line":1797},[1612,2163,1662],{"emptyLinePlaceholder":1661},[1612,2165,2166,2168,2170,2172,2174],{"class":1614,"line":1805},[1612,2167,1668],{"class":1618},[1612,2169,1672],{"class":1671},[1612,2171,1675],{"class":1618},[1612,2173,1678],{"class":1671},[1612,2175,1681],{"class":1622},[1612,2177,2178],{"class":1614,"line":1811},[1612,2179,2180],{"class":1702},"    // 查询全部\n",[1612,2182,2183,2185,2187,2189],{"class":1614,"line":1817},[1612,2184,1687],{"class":1618},[1612,2186,1691],{"class":1690},[1612,2188,1694],{"class":1622},[1612,2190,1681],{"class":1622},[1612,2192,2193,2195,2197],{"class":1614,"line":1822},[1612,2194,1710],{"class":1709},[1612,2196,1932],{"class":1626},[1612,2198,1655],{"class":1622},[1612,2200,2202],{"class":1614,"line":2201},14,[1612,2203,1808],{"class":1622},[1612,2205,2207],{"class":1614,"line":2206},15,[1612,2208,1662],{"emptyLinePlaceholder":1661},[1612,2210,2212],{"class":1614,"line":2211},16,[1612,2213,2214],{"class":1702},"    // 按 id 查询单个\n",[1612,2216,2218,2220,2223,2225,2229,2231],{"class":1614,"line":2217},17,[1612,2219,1687],{"class":1618},[1612,2221,2222],{"class":1690}," findById",[1612,2224,1640],{"class":1622},[1612,2226,2228],{"class":2227},"sK9QF","id",[1612,2230,1652],{"class":1622},[1612,2232,1681],{"class":1622},[1612,2234,2236,2238,2240,2242,2245,2247,2250,2253,2256,2258,2260,2263,2266,2268,2270,2273],{"class":1614,"line":2235},18,[1612,2237,1710],{"class":1709},[1612,2239,1932],{"class":1626},[1612,2241,1942],{"class":1622},[1612,2243,2244],{"class":1636},"find",[1612,2246,1640],{"class":1690},[1612,2248,2249],{"class":2227},"item",[1612,2251,2252],{"class":1618}," =>",[1612,2254,2255],{"class":1626}," item",[1612,2257,1942],{"class":1622},[1612,2259,2228],{"class":1626},[1612,2261,2262],{"class":1622}," ===",[1612,2264,2265],{"class":1636}," Number",[1612,2267,1640],{"class":1690},[1612,2269,2228],{"class":1626},[1612,2271,2272],{"class":1690},"))",[1612,2274,1655],{"class":1622},[1612,2276,2278],{"class":1614,"line":2277},19,[1612,2279,1808],{"class":1622},[1612,2281,2283],{"class":1614,"line":2282},20,[1612,2284,1662],{"emptyLinePlaceholder":1661},[1612,2286,2288],{"class":1614,"line":2287},21,[1612,2289,2290],{"class":1702},"    // 新增\n",[1612,2292,2294,2296,2299,2301,2304,2306],{"class":1614,"line":2293},22,[1612,2295,1687],{"class":1618},[1612,2297,2298],{"class":1690}," create",[1612,2300,1640],{"class":1622},[1612,2302,2303],{"class":2227},"data",[1612,2305,1652],{"class":1622},[1612,2307,1681],{"class":1622},[1612,2309,2311,2313,2316,2318,2320,2322,2324,2327,2330,2332,2334,2337,2339,2342,2344,2346,2348,2350,2352,2355],{"class":1614,"line":2310},23,[1612,2312,1912],{"class":1618},[1612,2314,2315],{"class":1626}," user",[1612,2317,1633],{"class":1622},[1612,2319,1623],{"class":1622},[1612,2321,1722],{"class":1690},[1612,2323,1725],{"class":1622},[1612,2325,2326],{"class":1626}," nextId",[1612,2328,2329],{"class":1622},"++,",[1612,2331,1735],{"class":1690},[1612,2333,1725],{"class":1622},[1612,2335,2336],{"class":1626}," data",[1612,2338,1942],{"class":1622},[1612,2340,2341],{"class":1626},"name",[1612,2343,1732],{"class":1622},[1612,2345,1750],{"class":1690},[1612,2347,1725],{"class":1622},[1612,2349,2336],{"class":1626},[1612,2351,1942],{"class":1622},[1612,2353,2354],{"class":1626},"age",[1612,2356,2357],{"class":1622}," };\n",[1612,2359,2361,2364,2366,2369,2371,2373,2375],{"class":1614,"line":2360},24,[1612,2362,2363],{"class":1626},"        users",[1612,2365,1942],{"class":1622},[1612,2367,2368],{"class":1636},"push",[1612,2370,1640],{"class":1690},[1612,2372,1950],{"class":1626},[1612,2374,1652],{"class":1690},[1612,2376,1655],{"class":1622},[1612,2378,2380,2382,2384],{"class":1614,"line":2379},25,[1612,2381,1710],{"class":1709},[1612,2383,2315],{"class":1626},[1612,2385,1655],{"class":1622},[1612,2387,2389],{"class":1614,"line":2388},26,[1612,2390,1808],{"class":1622},[1612,2392,2394],{"class":1614,"line":2393},27,[1612,2395,1662],{"emptyLinePlaceholder":1661},[1612,2397,2399],{"class":1614,"line":2398},28,[1612,2400,2401],{"class":1702},"    // 修改\n",[1612,2403,2405,2407,2410,2412,2414,2416,2418,2420],{"class":1614,"line":2404},29,[1612,2406,1687],{"class":1618},[1612,2408,2409],{"class":1690}," update",[1612,2411,1640],{"class":1622},[1612,2413,2228],{"class":2227},[1612,2415,1732],{"class":1622},[1612,2417,2336],{"class":2227},[1612,2419,1652],{"class":1622},[1612,2421,1681],{"class":1622},[1612,2423,2425,2427,2429,2431,2433,2436,2439,2441,2443,2445],{"class":1614,"line":2424},30,[1612,2426,1912],{"class":1618},[1612,2428,2315],{"class":1626},[1612,2430,1633],{"class":1622},[1612,2432,1937],{"class":1709},[1612,2434,2435],{"class":1622}," this.",[1612,2437,2438],{"class":1636},"findById",[1612,2440,1640],{"class":1690},[1612,2442,2228],{"class":1626},[1612,2444,1652],{"class":1690},[1612,2446,1655],{"class":1622},[1612,2448,2450,2453,2456,2459,2461,2464,2467],{"class":1614,"line":2449},31,[1612,2451,2452],{"class":1709},"        if",[1612,2454,2455],{"class":1690}," (",[1612,2457,2458],{"class":1622},"!",[1612,2460,1950],{"class":1626},[1612,2462,2463],{"class":1690},") ",[1612,2465,2466],{"class":1709},"return",[1612,2468,2469],{"class":1622}," null;\n",[1612,2471,2473],{"class":1614,"line":2472},32,[1612,2474,1662],{"emptyLinePlaceholder":1661},[1612,2476,2478,2480,2482,2484,2486,2488,2491,2494,2496,2498,2500,2502,2504,2506,2508,2510],{"class":1614,"line":2477},33,[1612,2479,2452],{"class":1709},[1612,2481,2455],{"class":1690},[1612,2483,2303],{"class":1626},[1612,2485,1942],{"class":1622},[1612,2487,2341],{"class":1626},[1612,2489,2490],{"class":1622}," !==",[1612,2492,2493],{"class":1622}," undefined",[1612,2495,2463],{"class":1690},[1612,2497,1950],{"class":1626},[1612,2499,1942],{"class":1622},[1612,2501,2341],{"class":1626},[1612,2503,1633],{"class":1622},[1612,2505,2336],{"class":1626},[1612,2507,1942],{"class":1622},[1612,2509,2341],{"class":1626},[1612,2511,1655],{"class":1622},[1612,2513,2515,2517,2519,2521,2523,2525,2527,2529,2531,2533,2535,2537,2539,2541,2543,2545],{"class":1614,"line":2514},34,[1612,2516,2452],{"class":1709},[1612,2518,2455],{"class":1690},[1612,2520,2303],{"class":1626},[1612,2522,1942],{"class":1622},[1612,2524,2354],{"class":1626},[1612,2526,2490],{"class":1622},[1612,2528,2493],{"class":1622},[1612,2530,2463],{"class":1690},[1612,2532,1950],{"class":1626},[1612,2534,1942],{"class":1622},[1612,2536,2354],{"class":1626},[1612,2538,1633],{"class":1622},[1612,2540,2336],{"class":1626},[1612,2542,1942],{"class":1622},[1612,2544,2354],{"class":1626},[1612,2546,1655],{"class":1622},[1612,2548,2550,2552,2554],{"class":1614,"line":2549},35,[1612,2551,1710],{"class":1709},[1612,2553,2315],{"class":1626},[1612,2555,1655],{"class":1622},[1612,2557,2559],{"class":1614,"line":2558},36,[1612,2560,1808],{"class":1622},[1612,2562,2564],{"class":1614,"line":2563},37,[1612,2565,1662],{"emptyLinePlaceholder":1661},[1612,2567,2569],{"class":1614,"line":2568},38,[1612,2570,2571],{"class":1702},"    // 删除\n",[1612,2573,2575,2577,2580,2582,2584,2586],{"class":1614,"line":2574},39,[1612,2576,1687],{"class":1618},[1612,2578,2579],{"class":1690}," remove",[1612,2581,1640],{"class":1622},[1612,2583,2228],{"class":2227},[1612,2585,1652],{"class":1622},[1612,2587,1681],{"class":1622},[1612,2589,2591,2593,2595,2597,2599,2601,2604,2606,2608,2610,2612,2614,2616,2618,2620,2622,2624,2626],{"class":1614,"line":2590},40,[1612,2592,1912],{"class":1618},[1612,2594,1903],{"class":1626},[1612,2596,1633],{"class":1622},[1612,2598,1932],{"class":1626},[1612,2600,1942],{"class":1622},[1612,2602,2603],{"class":1636},"findIndex",[1612,2605,1640],{"class":1690},[1612,2607,2249],{"class":2227},[1612,2609,2252],{"class":1618},[1612,2611,2255],{"class":1626},[1612,2613,1942],{"class":1622},[1612,2615,2228],{"class":1626},[1612,2617,2262],{"class":1622},[1612,2619,2265],{"class":1636},[1612,2621,1640],{"class":1690},[1612,2623,2228],{"class":1626},[1612,2625,2272],{"class":1690},[1612,2627,1655],{"class":1622},[1612,2629,2631,2633,2635,2638,2640,2643,2646,2648,2650,2654],{"class":1614,"line":2630},41,[1612,2632,2452],{"class":1709},[1612,2634,2455],{"class":1690},[1612,2636,2637],{"class":1626},"index",[1612,2639,2262],{"class":1622},[1612,2641,2642],{"class":1622}," -",[1612,2644,2645],{"class":1728},"1",[1612,2647,2463],{"class":1690},[1612,2649,2466],{"class":1709},[1612,2651,2653],{"class":2652},"sPKOg"," false",[1612,2655,1655],{"class":1622},[1612,2657,2659],{"class":1614,"line":2658},42,[1612,2660,1662],{"emptyLinePlaceholder":1661},[1612,2662,2664,2666,2668,2671,2673,2675,2677,2679,2681],{"class":1614,"line":2663},43,[1612,2665,2363],{"class":1626},[1612,2667,1942],{"class":1622},[1612,2669,2670],{"class":1636},"splice",[1612,2672,1640],{"class":1690},[1612,2674,2637],{"class":1626},[1612,2676,1732],{"class":1622},[1612,2678,1729],{"class":1728},[1612,2680,1652],{"class":1690},[1612,2682,1655],{"class":1622},[1612,2684,2686,2688,2691],{"class":1614,"line":2685},44,[1612,2687,1710],{"class":1709},[1612,2689,2690],{"class":2652}," true",[1612,2692,1655],{"class":1622},[1612,2694,2696],{"class":1614,"line":2695},45,[1612,2697,1808],{"class":1622},[1612,2699,2701],{"class":1614,"line":2700},46,[1612,2702,1814],{"class":1622},[1612,2704,2706],{"class":1614,"line":2705},47,[1612,2707,1662],{"emptyLinePlaceholder":1661},[1612,2709,2711,2713,2715,2717],{"class":1614,"line":2710},48,[1612,2712,1825],{"class":1622},[1612,2714,1633],{"class":1622},[1612,2716,1672],{"class":1626},[1612,2718,1655],{"class":1622},[2720,2721,2722],"warning",{},[1531,2723,2724,2725,2728,2729,2732],{},"注意数组要定义在 ",[1557,2726,2727],{},"class 外面","（模块顶层）。Egg 会为每个请求创建新的 Service 实例，如果数组挂在实例上（如 ",[1535,2730,2731],{},"this.users","），每个请求拿到的都是全新的空数据，新增后立刻查询会看不到。定义在模块顶层才能让所有请求共享同一份数据。当然这只是学习用的临时方案，真实项目要换成数据库。",[1544,2734],{},[1526,2736,2738],{"id":2737},"controller-调用-service-的完整流程","🛠 Controller 调用 Service 的完整流程",[1531,2740,2741,2742,2745],{},"配合上一篇的 ",[1535,2743,2744],{},"router.resources('users', '/users', controller.user)","，Controller 变成纯粹的“调度员”：",[1602,2747,2749],{"className":1604,"code":2748,"filename":1849,"language":1607,"meta":1608,"style":1608},"const { Controller } = require('egg');\n\nclass UserController extends Controller {\n    // GET /users\n    async index() {\n        const { ctx } = this;\n        ctx.body = await ctx.service.user.findAll();\n    }\n\n    // GET /users/:id\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.body = { message: '用户不存在' };\n            return;\n        }\n\n        ctx.body = user;\n    }\n\n    // POST /users\n    async create() {\n        const { ctx } = this;\n        const user = await ctx.service.user.create(ctx.request.body);\n        ctx.status = 201;\n        ctx.body = user;\n    }\n}\n\nmodule.exports = UserController;\n",[1535,2750,2751,2777,2781,2793,2798,2808,2822,2852,2856,2860,2865,2876,2890,2932,2936,2951,2968,2994,3001,3006,3010,3024,3028,3032,3037,3047,3061,3103,3118,3132,3136,3140,3144],{"__ignoreMap":1608},[1612,2752,2753,2755,2757,2759,2761,2763,2765,2767,2769,2771,2773,2775],{"class":1614,"line":1615},[1612,2754,1619],{"class":1618},[1612,2756,1623],{"class":1622},[1612,2758,1860],{"class":1626},[1612,2760,1630],{"class":1622},[1612,2762,1633],{"class":1622},[1612,2764,1637],{"class":1636},[1612,2766,1640],{"class":1626},[1612,2768,1643],{"class":1622},[1612,2770,1647],{"class":1646},[1612,2772,1643],{"class":1622},[1612,2774,1652],{"class":1626},[1612,2776,1655],{"class":1622},[1612,2778,2779],{"class":1614,"line":1658},[1612,2780,1662],{"emptyLinePlaceholder":1661},[1612,2782,2783,2785,2787,2789,2791],{"class":1614,"line":1665},[1612,2784,1668],{"class":1618},[1612,2786,1889],{"class":1671},[1612,2788,1675],{"class":1618},[1612,2790,1894],{"class":1671},[1612,2792,1681],{"class":1622},[1612,2794,2795],{"class":1614,"line":1684},[1612,2796,2797],{"class":1702},"    // GET /users\n",[1612,2799,2800,2802,2804,2806],{"class":1614,"line":1699},[1612,2801,1687],{"class":1618},[1612,2803,1903],{"class":1690},[1612,2805,1694],{"class":1622},[1612,2807,1681],{"class":1622},[1612,2809,2810,2812,2814,2816,2818,2820],{"class":1614,"line":1706},[1612,2811,1912],{"class":1618},[1612,2813,1623],{"class":1622},[1612,2815,1917],{"class":1626},[1612,2817,1920],{"class":1622},[1612,2819,1633],{"class":1622},[1612,2821,1925],{"class":1622},[1612,2823,2824,2826,2828,2830,2832,2834,2836,2838,2840,2842,2844,2846,2848,2850],{"class":1614,"line":1716},[1612,2825,1963],{"class":1626},[1612,2827,1942],{"class":1622},[1612,2829,1968],{"class":1626},[1612,2831,1633],{"class":1622},[1612,2833,1937],{"class":1709},[1612,2835,1917],{"class":1626},[1612,2837,1942],{"class":1622},[1612,2839,1945],{"class":1626},[1612,2841,1942],{"class":1622},[1612,2843,1950],{"class":1626},[1612,2845,1942],{"class":1622},[1612,2847,1840],{"class":1636},[1612,2849,1694],{"class":1690},[1612,2851,1655],{"class":1622},[1612,2853,2854],{"class":1614,"line":1761},[1612,2855,1808],{"class":1622},[1612,2857,2858],{"class":1614,"line":1797},[1612,2859,1662],{"emptyLinePlaceholder":1661},[1612,2861,2862],{"class":1614,"line":1805},[1612,2863,2864],{"class":1702},"    // GET /users/:id\n",[1612,2866,2867,2869,2872,2874],{"class":1614,"line":1811},[1612,2868,1687],{"class":1618},[1612,2870,2871],{"class":1690}," show",[1612,2873,1694],{"class":1622},[1612,2875,1681],{"class":1622},[1612,2877,2878,2880,2882,2884,2886,2888],{"class":1614,"line":1817},[1612,2879,1912],{"class":1618},[1612,2881,1623],{"class":1622},[1612,2883,1917],{"class":1626},[1612,2885,1920],{"class":1622},[1612,2887,1633],{"class":1622},[1612,2889,1925],{"class":1622},[1612,2891,2892,2894,2896,2898,2900,2902,2904,2906,2908,2910,2912,2914,2916,2919,2921,2924,2926,2928,2930],{"class":1614,"line":1822},[1612,2893,1912],{"class":1618},[1612,2895,2315],{"class":1626},[1612,2897,1633],{"class":1622},[1612,2899,1937],{"class":1709},[1612,2901,1917],{"class":1626},[1612,2903,1942],{"class":1622},[1612,2905,1945],{"class":1626},[1612,2907,1942],{"class":1622},[1612,2909,1950],{"class":1626},[1612,2911,1942],{"class":1622},[1612,2913,2438],{"class":1636},[1612,2915,1640],{"class":1690},[1612,2917,2918],{"class":1626},"ctx",[1612,2920,1942],{"class":1622},[1612,2922,2923],{"class":1626},"params",[1612,2925,1942],{"class":1622},[1612,2927,2228],{"class":1626},[1612,2929,1652],{"class":1690},[1612,2931,1655],{"class":1622},[1612,2933,2934],{"class":1614,"line":2201},[1612,2935,1662],{"emptyLinePlaceholder":1661},[1612,2937,2938,2940,2942,2944,2946,2948],{"class":1614,"line":2206},[1612,2939,2452],{"class":1709},[1612,2941,2455],{"class":1690},[1612,2943,2458],{"class":1622},[1612,2945,1950],{"class":1626},[1612,2947,2463],{"class":1690},[1612,2949,2950],{"class":1622},"{\n",[1612,2952,2953,2956,2958,2961,2963,2966],{"class":1614,"line":2211},[1612,2954,2955],{"class":1626},"            ctx",[1612,2957,1942],{"class":1622},[1612,2959,2960],{"class":1626},"status",[1612,2962,1633],{"class":1622},[1612,2964,2965],{"class":1728}," 404",[1612,2967,1655],{"class":1622},[1612,2969,2970,2972,2974,2976,2978,2980,2983,2985,2987,2990,2992],{"class":1614,"line":2217},[1612,2971,2955],{"class":1626},[1612,2973,1942],{"class":1622},[1612,2975,1968],{"class":1626},[1612,2977,1633],{"class":1622},[1612,2979,1623],{"class":1622},[1612,2981,2982],{"class":1690}," message",[1612,2984,1725],{"class":1622},[1612,2986,1740],{"class":1622},[1612,2988,2989],{"class":1646},"用户不存在",[1612,2991,1643],{"class":1622},[1612,2993,2357],{"class":1622},[1612,2995,2996,2999],{"class":1614,"line":2235},[1612,2997,2998],{"class":1709},"            return",[1612,3000,1655],{"class":1622},[1612,3002,3003],{"class":1614,"line":2277},[1612,3004,3005],{"class":1622},"        }\n",[1612,3007,3008],{"class":1614,"line":2282},[1612,3009,1662],{"emptyLinePlaceholder":1661},[1612,3011,3012,3014,3016,3018,3020,3022],{"class":1614,"line":2287},[1612,3013,1963],{"class":1626},[1612,3015,1942],{"class":1622},[1612,3017,1968],{"class":1626},[1612,3019,1633],{"class":1622},[1612,3021,2315],{"class":1626},[1612,3023,1655],{"class":1622},[1612,3025,3026],{"class":1614,"line":2293},[1612,3027,1808],{"class":1622},[1612,3029,3030],{"class":1614,"line":2310},[1612,3031,1662],{"emptyLinePlaceholder":1661},[1612,3033,3034],{"class":1614,"line":2360},[1612,3035,3036],{"class":1702},"    // POST /users\n",[1612,3038,3039,3041,3043,3045],{"class":1614,"line":2379},[1612,3040,1687],{"class":1618},[1612,3042,2298],{"class":1690},[1612,3044,1694],{"class":1622},[1612,3046,1681],{"class":1622},[1612,3048,3049,3051,3053,3055,3057,3059],{"class":1614,"line":2388},[1612,3050,1912],{"class":1618},[1612,3052,1623],{"class":1622},[1612,3054,1917],{"class":1626},[1612,3056,1920],{"class":1622},[1612,3058,1633],{"class":1622},[1612,3060,1925],{"class":1622},[1612,3062,3063,3065,3067,3069,3071,3073,3075,3077,3079,3081,3083,3086,3088,3090,3092,3095,3097,3099,3101],{"class":1614,"line":2393},[1612,3064,1912],{"class":1618},[1612,3066,2315],{"class":1626},[1612,3068,1633],{"class":1622},[1612,3070,1937],{"class":1709},[1612,3072,1917],{"class":1626},[1612,3074,1942],{"class":1622},[1612,3076,1945],{"class":1626},[1612,3078,1942],{"class":1622},[1612,3080,1950],{"class":1626},[1612,3082,1942],{"class":1622},[1612,3084,3085],{"class":1636},"create",[1612,3087,1640],{"class":1690},[1612,3089,2918],{"class":1626},[1612,3091,1942],{"class":1622},[1612,3093,3094],{"class":1626},"request",[1612,3096,1942],{"class":1622},[1612,3098,1968],{"class":1626},[1612,3100,1652],{"class":1690},[1612,3102,1655],{"class":1622},[1612,3104,3105,3107,3109,3111,3113,3116],{"class":1614,"line":2398},[1612,3106,1963],{"class":1626},[1612,3108,1942],{"class":1622},[1612,3110,2960],{"class":1626},[1612,3112,1633],{"class":1622},[1612,3114,3115],{"class":1728}," 201",[1612,3117,1655],{"class":1622},[1612,3119,3120,3122,3124,3126,3128,3130],{"class":1614,"line":2404},[1612,3121,1963],{"class":1626},[1612,3123,1942],{"class":1622},[1612,3125,1968],{"class":1626},[1612,3127,1633],{"class":1622},[1612,3129,2315],{"class":1626},[1612,3131,1655],{"class":1622},[1612,3133,3134],{"class":1614,"line":2424},[1612,3135,1808],{"class":1622},[1612,3137,3138],{"class":1614,"line":2449},[1612,3139,1814],{"class":1622},[1612,3141,3142],{"class":1614,"line":2472},[1612,3143,1662],{"emptyLinePlaceholder":1661},[1612,3145,3146,3148,3150,3152],{"class":1614,"line":2477},[1612,3147,1825],{"class":1622},[1612,3149,1633],{"class":1622},[1612,3151,1889],{"class":1626},[1612,3153,1655],{"class":1622},[1531,3155,3156],{},"可以看到 Controller 里已经没有任何数据操作的细节了，只有取参数、调 Service、返回结果三步。",[1544,3158],{},[1526,3160,3162],{"id":3161},"为什么-service-方法都写成-async","⚡ 为什么 Service 方法都写成 async",[1531,3164,3165,3166,3169],{},"你可能会疑惑：操作内存数组明明是同步的，为什么要加 ",[1535,3167,3168],{},"async","？",[1531,3171,3172,3173,3176,3177,3179,3180,3183],{},"这是为了",[1557,3174,3175],{},"面向未来编程","。真实项目中 Service 会操作数据库，而数据库操作是异步的。现在统一用 ",[1535,3178,3168],{}," 定义、用 ",[1535,3181,3182],{},"await"," 调用，将来换成数据库时，Service 内部的实现变了，但方法签名不变，Controller 不用做任何修改。",[1544,3185],{},[1526,3187,3189],{"id":3188},"小节总结","🧾 小节总结",[1569,3191,3192,3195,3207,3216,3219],{},[1572,3193,3194],{},"Service 是业务逻辑层，负责数据操作和具体业务；Controller 只负责接收请求、调用 Service、返回结果。",[1572,3196,1589,3197,3199,3200,3202,3203,3206],{},[1535,3198,1606],{}," 中定义 class 继承 ",[1535,3201,1599],{},"，通过 ",[1535,3204,3205],{},"ctx.service.user.xxx()"," 调用。",[1572,3208,3209,3210,3212,3213,3215],{},"Service 里可以用 ",[1535,3211,2006],{}," 访问上下文、",[1535,3214,2010],{}," 访问应用实例。",[1572,3217,3218],{},"学习阶段可以用内存数组模拟增删改查，但它只是临时方案，真实项目要接数据库。",[1572,3220,3221,3222,3224],{},"Service 方法统一写成 ",[1535,3223,3168],{},"，为将来接入数据库留好接口。",[1544,3226],{},[1526,3228,3230],{"id":3229},"知识问答","❓ 知识问答",[1531,3232,3233],{},[1557,3234,3235],{},"Q1：Controller 和 Service 的代码看起来很薄，会不会是过度设计？",[1531,3237,3238],{},"小 demo 确实感觉不明显，但业务一复杂差距就出来了。而且 Egg 项目都遵循这个约定，从一开始就按规范写，能养成好习惯，团队协作时也更顺畅。",[1531,3240,3241],{},[1557,3242,3243],{},"Q2：Service 里能调用另一个 Service 吗？",[1531,3245,3246,3247,3250],{},"可以，通过 ",[1535,3248,3249],{},"this.ctx.service.另一个Service名"," 调用。比如订单 Service 里调用用户 Service 查用户信息。",[1531,3252,3253],{},[1557,3254,3255],{},"Q3：为什么数组要定义在 class 外面？",[1531,3257,3258],{},"Egg 默认每个请求都会创建新的 Service 实例，挂在实例上的数据互不影响。定义在模块顶层后，模块只会加载一次，数组就能被所有请求共享，新增、修改才能持续生效。",[1531,3260,3261],{},[1557,3262,3263],{},"Q4：Service 必须继承 Service 基类吗？",[1531,3265,3266,3267,3269,3270,3272,3273,3275],{},"按 Egg 的约定需要继承，这样框架才会自动挂载到 ",[1535,3268,1541],{}," 上，并注入 ",[1535,3271,2006],{}," 和 ",[1535,3274,2010],{},"。",[1544,3277],{},[1526,3279,3281],{"id":3280},"小练习","🧪 小练习",[1531,3283,3284,3285,3288,3289,3272,3291,3293],{},"新建 ",[1535,3286,3287],{},"app/service/goods.js","，封装一个商品 Service，包含 ",[1535,3290,1840],{},[1535,3292,2438],{}," 两个方法（内存数组模拟），并在 Controller 中调用。",[1602,3295,3297],{"className":1604,"code":3296,"filename":3287,"language":1607,"meta":1608,"style":1608},"const { Service } = require('egg');\n\n// 模块顶层的模拟数据\nconst goods = [\n    { id: 1, name: '键盘', price: 99 },\n    { id: 2, name: '鼠标', price: 49 },\n];\n\nclass GoodsService extends Service {\n    async findAll() {\n        // 请在这里编写代码\n    }\n\n    async findById(id) {\n        // 请在这里编写代码\n    }\n}\n\nmodule.exports = GoodsService;\n",[1535,3298,3299,3325,3329,3334,3345,3380,3414,3420,3424,3437,3447,3452,3456,3460,3474,3478,3482,3486,3490],{"__ignoreMap":1608},[1612,3300,3301,3303,3305,3307,3309,3311,3313,3315,3317,3319,3321,3323],{"class":1614,"line":1615},[1612,3302,1619],{"class":1618},[1612,3304,1623],{"class":1622},[1612,3306,1627],{"class":1626},[1612,3308,1630],{"class":1622},[1612,3310,1633],{"class":1622},[1612,3312,1637],{"class":1636},[1612,3314,1640],{"class":1626},[1612,3316,1643],{"class":1622},[1612,3318,1647],{"class":1646},[1612,3320,1643],{"class":1622},[1612,3322,1652],{"class":1626},[1612,3324,1655],{"class":1622},[1612,3326,3327],{"class":1614,"line":1658},[1612,3328,1662],{"emptyLinePlaceholder":1661},[1612,3330,3331],{"class":1614,"line":1665},[1612,3332,3333],{"class":1702},"// 模块顶层的模拟数据\n",[1612,3335,3336,3338,3341,3343],{"class":1614,"line":1684},[1612,3337,1619],{"class":1618},[1612,3339,3340],{"class":1626}," goods ",[1612,3342,2070],{"class":1622},[1612,3344,1713],{"class":1626},[1612,3346,3347,3349,3351,3353,3355,3357,3359,3361,3363,3366,3368,3370,3373,3375,3378],{"class":1614,"line":1699},[1612,3348,2077],{"class":1622},[1612,3350,1722],{"class":1690},[1612,3352,1725],{"class":1622},[1612,3354,1729],{"class":1728},[1612,3356,1732],{"class":1622},[1612,3358,1735],{"class":1690},[1612,3360,1725],{"class":1622},[1612,3362,1740],{"class":1622},[1612,3364,3365],{"class":1646},"键盘",[1612,3367,1643],{"class":1622},[1612,3369,1732],{"class":1622},[1612,3371,3372],{"class":1690}," price",[1612,3374,1725],{"class":1622},[1612,3376,3377],{"class":1728}," 99",[1612,3379,1758],{"class":1622},[1612,3381,3382,3384,3386,3388,3390,3392,3394,3396,3398,3401,3403,3405,3407,3409,3412],{"class":1614,"line":1706},[1612,3383,2077],{"class":1622},[1612,3385,1722],{"class":1690},[1612,3387,1725],{"class":1622},[1612,3389,1770],{"class":1728},[1612,3391,1732],{"class":1622},[1612,3393,1735],{"class":1690},[1612,3395,1725],{"class":1622},[1612,3397,1740],{"class":1622},[1612,3399,3400],{"class":1646},"鼠标",[1612,3402,1643],{"class":1622},[1612,3404,1732],{"class":1622},[1612,3406,3372],{"class":1690},[1612,3408,1725],{"class":1622},[1612,3410,3411],{"class":1728}," 49",[1612,3413,1758],{"class":1622},[1612,3415,3416,3418],{"class":1614,"line":1716},[1612,3417,2142],{"class":1626},[1612,3419,1655],{"class":1622},[1612,3421,3422],{"class":1614,"line":1761},[1612,3423,1662],{"emptyLinePlaceholder":1661},[1612,3425,3426,3428,3431,3433,3435],{"class":1614,"line":1797},[1612,3427,1668],{"class":1618},[1612,3429,3430],{"class":1671}," GoodsService",[1612,3432,1675],{"class":1618},[1612,3434,1678],{"class":1671},[1612,3436,1681],{"class":1622},[1612,3438,3439,3441,3443,3445],{"class":1614,"line":1805},[1612,3440,1687],{"class":1618},[1612,3442,1691],{"class":1690},[1612,3444,1694],{"class":1622},[1612,3446,1681],{"class":1622},[1612,3448,3449],{"class":1614,"line":1811},[1612,3450,3451],{"class":1702},"        // 请在这里编写代码\n",[1612,3453,3454],{"class":1614,"line":1817},[1612,3455,1808],{"class":1622},[1612,3457,3458],{"class":1614,"line":1822},[1612,3459,1662],{"emptyLinePlaceholder":1661},[1612,3461,3462,3464,3466,3468,3470,3472],{"class":1614,"line":2201},[1612,3463,1687],{"class":1618},[1612,3465,2222],{"class":1690},[1612,3467,1640],{"class":1622},[1612,3469,2228],{"class":2227},[1612,3471,1652],{"class":1622},[1612,3473,1681],{"class":1622},[1612,3475,3476],{"class":1614,"line":2206},[1612,3477,3451],{"class":1702},[1612,3479,3480],{"class":1614,"line":2211},[1612,3481,1808],{"class":1622},[1612,3483,3484],{"class":1614,"line":2217},[1612,3485,1814],{"class":1622},[1612,3487,3488],{"class":1614,"line":2235},[1612,3489,1662],{"emptyLinePlaceholder":1661},[1612,3491,3492,3494,3496,3498],{"class":1614,"line":2277},[1612,3493,1825],{"class":1622},[1612,3495,1633],{"class":1622},[1612,3497,3430],{"class":1626},[1612,3499,1655],{"class":1622},[1544,3501],{},[1531,3503,3504],{},"🎉 恭喜你已经掌握 Service 业务逻辑层啦！下一篇我们学习配置与中间件，看看 Egg 的配置体系和自定义中间件怎么用。",[3506,3507,3508],"style",{},"html pre.shiki code .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .syuKq, html code.shiki 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Controller 的职责定位。",{"title":1233,"path":1234,"stem":1235,"description":3531,"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。",1784715110648]