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就能干活。",[1804,1805,1806],"warning",{},[1531,1807,1808,1809,1812,1813,1816],{},"如果前端项目和 GraphQL 服务不在同一个端口（比如前端 3000、后端 4000），浏览器会按跨域处理。standalone 模式默认允许跨域；Express 集成模式下，需要给 ",[1543,1810,1811],{},"/graphql"," 路径加上 ",[1543,1814,1815],{},"cors"," 中间件。",[1552,1818],{},[1526,1820,1822],{"id":1821},"用-fetch-封装请求函数","🛠 用 fetch 封装请求函数",[1531,1824,1825],{},"前端项目里，建议先把「发 GraphQL 请求」封装成一个通用函数，业务代码只关心查询语句和变量：",[1597,1827,1832],{"className":1828,"code":1829,"filename":1830,"language":1831,"meta":1602,"style":1602},"language-js shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const API_URL = 'http://localhost:4000/graphql';\n\nexport async function graphqlRequest(query, variables) {\n    const res = await fetch(API_URL, {\n        method: 'POST',\n        headers: {\n            'Content-Type': 'application/json',\n        },\n        body: JSON.stringify({ query, variables }),\n    });\n\n    const result = await res.json();\n\n    if (result.errors) {\n        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graphqlRequest",[1606,1877,1878],{"class":1630},"(",[1606,1880,1587],{"class":1881},"sK9QF",[1606,1883,1727],{"class":1630},[1606,1885,1886],{"class":1881}," variables",[1606,1888,1889],{"class":1630},")",[1606,1891,1685],{"class":1630},[1606,1893,1894,1897,1900,1903,1906,1909,1912,1915,1917],{"class":1608,"line":1703},[1606,1895,1896],{"class":1675},"    const",[1606,1898,1899],{"class":1620}," res",[1606,1901,1902],{"class":1630}," =",[1606,1904,1905],{"class":1864}," await",[1606,1907,1908],{"class":1874}," fetch",[1606,1910,1878],{"class":1911},"sd2Uz",[1606,1913,1914],{"class":1620},"API_URL",[1606,1916,1727],{"class":1630},[1606,1918,1685],{"class":1630},[1606,1920,1921,1924,1926,1928,1931,1933],{"class":1608,"line":1745},[1606,1922,1923],{"class":1911},"        method",[1606,1925,1682],{"class":1630},[1606,1927,1631],{"class":1630},[1606,1929,1930],{"class":1616},"POST",[1606,1932,1636],{"class":1630},[1606,1934,1935],{"class":1630},",\n",[1606,1937,1938,1941,1943],{"class":1608,"line":1781},[1606,1939,1940],{"class":1911},"        headers",[1606,1942,1682],{"class":1630},[1606,1944,1685],{"class":1630},[1606,1946,1947,1950,1953,1955,1957,1959,1962,1964],{"class":1608,"line":1787},[1606,1948,1949],{"class":1630},"            '",[1606,1951,1952],{"class":1911},"Content-Type",[1606,1954,1636],{"class":1630},[1606,1956,1682],{"class":1630},[1606,1958,1631],{"class":1630},[1606,1960,1961],{"class":1616},"application/json",[1606,1963,1636],{"class":1630},[1606,1965,1935],{"class":1630},[1606,1967,1968],{"class":1608,"line":1793},[1606,1969,1970],{"class":1630},"        },\n",[1606,1972,1974,1977,1979,1982,1985,1988,1990,1993,1996,1998,2000,2003,2005],{"class":1608,"line":1973},9,[1606,1975,1976],{"class":1911},"        body",[1606,1978,1682],{"class":1630},[1606,1980,1981],{"class":1620}," JSON",[1606,1983,1984],{"class":1630},".",[1606,1986,1987],{"class":1874},"stringify",[1606,1989,1878],{"class":1911},[1606,1991,1992],{"class":1630},"{",[1606,1994,1995],{"class":1620}," query",[1606,1997,1727],{"class":1630},[1606,1999,1886],{"class":1620},[1606,2001,2002],{"class":1630}," }",[1606,2004,1889],{"class":1911},[1606,2006,1935],{"class":1630},[1606,2008,2010,2013,2015],{"class":1608,"line":2009},10,[1606,2011,2012],{"class":1630},"    }",[1606,2014,1889],{"class":1911},[1606,2016,1853],{"class":1630},[1606,2018,2020],{"class":1608,"line":2019},11,[1606,2021,1859],{"emptyLinePlaceholder":1858},[1606,2023,2025,2027,2030,2032,2034,2036,2038,2040,2043],{"class":1608,"line":2024},12,[1606,2026,1896],{"class":1675},[1606,2028,2029],{"class":1620}," result",[1606,2031,1902],{"class":1630},[1606,2033,1905],{"class":1864},[1606,2035,1899],{"class":1620},[1606,2037,1984],{"class":1630},[1606,2039,1660],{"class":1874},[1606,2041,2042],{"class":1911},"()",[1606,2044,1853],{"class":1630},[1606,2046,2048],{"class":1608,"line":2047},13,[1606,2049,1859],{"emptyLinePlaceholder":1858},[1606,2051,2053,2056,2059,2062,2064,2067,2070],{"class":1608,"line":2052},14,[1606,2054,2055],{"class":1864},"    if",[1606,2057,2058],{"class":1911}," (",[1606,2060,2061],{"class":1620},"result",[1606,2063,1984],{"class":1630},[1606,2065,2066],{"class":1620},"errors",[1606,2068,2069],{"class":1911},") ",[1606,2071,1667],{"class":1630},[1606,2073,2075,2078,2081,2084,2086,2088,2090,2092,2095,2098,2101,2103,2106,2108],{"class":1608,"line":2074},15,[1606,2076,2077],{"class":1864},"        throw",[1606,2079,2080],{"class":1630}," new",[1606,2082,2083],{"class":1874}," Error",[1606,2085,1878],{"class":1911},[1606,2087,2061],{"class":1620},[1606,2089,1984],{"class":1630},[1606,2091,2066],{"class":1620},[1606,2093,2094],{"class":1911},"[",[1606,2096,2097],{"class":1712},"0",[1606,2099,2100],{"class":1911},"]",[1606,2102,1984],{"class":1630},[1606,2104,2105],{"class":1620},"message",[1606,2107,1889],{"class":1911},[1606,2109,1853],{"class":1630},[1606,2111,2113],{"class":1608,"line":2112},16,[1606,2114,1790],{"class":1630},[1606,2116,2118],{"class":1608,"line":2117},17,[1606,2119,1859],{"emptyLinePlaceholder":1858},[1606,2121,2123,2126,2128,2130,2132],{"class":1608,"line":2122},18,[1606,2124,2125],{"class":1864},"    return",[1606,2127,2029],{"class":1620},[1606,2129,1984],{"class":1630},[1606,2131,1676],{"class":1620},[1606,2133,1853],{"class":1630},[1606,2135,2137],{"class":1608,"line":2136},19,[1606,2138,1796],{"class":1630},[1531,2140,2141],{},"这个函数做了三件事：按固定格式发 POST 请求、解析 JSON、把 GraphQL 返回的错误转成异常抛出。之后任何页面要用数据，一行就能调：",[1597,2143,2145],{"className":1828,"code":2144,"language":1831,"meta":1602,"style":1602},"const data = await graphqlRequest('{ users { username age } }');\nconsole.log(data.users);\n",[1543,2146,2147,2173],{"__ignoreMap":1602},[1606,2148,2149,2151,2154,2156,2158,2160,2162,2164,2167,2169,2171],{"class":1608,"line":1609},[1606,2150,1838],{"class":1675},[1606,2152,2153],{"class":1620}," data ",[1606,2155,1844],{"class":1630},[1606,2157,1905],{"class":1864},[1606,2159,1875],{"class":1874},[1606,2161,1878],{"class":1620},[1606,2163,1636],{"class":1630},[1606,2165,2166],{"class":1616},"{ users { username age } }",[1606,2168,1636],{"class":1630},[1606,2170,1889],{"class":1620},[1606,2172,1853],{"class":1630},[1606,2174,2175,2178,2180,2183,2186,2188,2191],{"class":1608,"line":1624},[1606,2176,2177],{"class":1620},"console",[1606,2179,1984],{"class":1630},[1606,2181,2182],{"class":1874},"log",[1606,2184,2185],{"class":1620},"(data",[1606,2187,1984],{"class":1630},[1606,2189,2190],{"class":1620},"users)",[1606,2192,1853],{"class":1630},[1552,2194],{},[1526,2196,2198],{"id":2197},"在-vue3-页面中使用","✨ 在 Vue3 页面中使用",[1531,2200,2201],{},"用一个完整的小页面把流程串起来：进入页面时加载用户列表，渲染出来；点击按钮新增一个用户后重新加载。",[1597,2203,2208],{"className":2204,"code":2205,"filename":2206,"language":2207,"meta":1602,"style":1602},"language-vue shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Cscript setup>\nimport { ref, onMounted } from 'vue';\nimport { graphqlRequest } from './api';\n\nconst users = ref([]);\n\nasync function loadUsers() {\n    const data = await graphqlRequest(`\n        {\n            users {\n                id\n                username\n                age\n            }\n        }\n    `);\n    users.value = data.users;\n}\n\nasync function addUser() {\n    await graphqlRequest(\n        `\n            mutation Create($input: CreateUserInput!) {\n                createUser(input: $input) {\n                    id\n                }\n            }\n        `,\n        {\n            input: { username: '新用户', age: 18 },\n        }\n    );\n    await loadUsers();\n}\n\nonMounted(() => {\n    loadUsers();\n});\n\u003C/script>\n\n\u003Ctemplate>\n    \u003Cul>\n        \u003Cli v-for=\"item in users\" :key=\"item.id\">\n            {{ item.username }}（{{ item.age }} 岁）\n        \u003C/li>\n    \u003C/ul>\n    \u003Cbutton @click=\"addUser\">新增用户\u003C/button>\n\u003C/template>\n","UserList.vue","vue",[1543,2209,2210,2224,2253,2274,2278,2294,2298,2312,2330,2335,2340,2345,2350,2355,2360,2365,2374,2394,2398,2402,2416,2427,2433,2439,2445,2451,2457,2462,2470,2475,2509,2514,2522,2533,2538,2543,2558,2568,2578,2588,2593,2603,2613,2647,2653,2663,2673,2705],{"__ignoreMap":1602},[1606,2211,2212,2215,2218,2221],{"class":1608,"line":1609},[1606,2213,2214],{"class":1630},"\u003C",[1606,2216,2217],{"class":1911},"script",[1606,2219,2220],{"class":1675}," setup",[1606,2222,2223],{"class":1630},">\n",[1606,2225,2226,2229,2232,2235,2237,2240,2242,2245,2247,2249,2251],{"class":1608,"line":1624},[1606,2227,2228],{"class":1864},"import",[1606,2230,2231],{"class":1630}," {",[1606,2233,2234],{"class":1620}," ref",[1606,2236,1727],{"class":1630},[1606,2238,2239],{"class":1620}," onMounted",[1606,2241,2002],{"class":1630},[1606,2243,2244],{"class":1864}," 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{\n",[1606,2341,2342],{"class":1608,"line":2019},[1606,2343,2344],{"class":1616},"                id\n",[1606,2346,2347],{"class":1608,"line":2024},[1606,2348,2349],{"class":1616},"                username\n",[1606,2351,2352],{"class":1608,"line":2047},[1606,2353,2354],{"class":1616},"                age\n",[1606,2356,2357],{"class":1608,"line":2052},[1606,2358,2359],{"class":1616},"            }\n",[1606,2361,2362],{"class":1608,"line":2074},[1606,2363,2364],{"class":1616},"        }\n",[1606,2366,2367,2370,2372],{"class":1608,"line":2112},[1606,2368,2369],{"class":1630},"    `",[1606,2371,1889],{"class":1911},[1606,2373,1853],{"class":1630},[1606,2375,2376,2379,2381,2384,2386,2388,2390,2392],{"class":1608,"line":2117},[1606,2377,2378],{"class":1620},"    users",[1606,2380,1984],{"class":1630},[1606,2382,2383],{"class":1620},"value",[1606,2385,1902],{"class":1630},[1606,2387,2318],{"class":1620},[1606,2389,1984],{"class":1630},[1606,2391,1693],{"class":1620},[1606,2393,1853],{"class":1630},[1606,2395,2396],{"class":1608,"line":2122},[1606,2397,1796],{"class":1630},[1606,2399,2400],{"class":1608,"line":2136},[1606,2401,1859],{"emptyLinePlaceholder":1858},[1606,2403,2405,2407,2409,2412,2414],{"class":1608,"line":2404},20,[1606,2406,2302],{"class":1675},[1606,2408,1871],{"class":1675},[1606,2410,2411],{"class":1874}," addUser",[1606,2413,2042],{"class":1630},[1606,2415,1685],{"class":1630},[1606,2417,2419,2422,2424],{"class":1608,"line":2418},21,[1606,2420,2421],{"class":1864},"    await",[1606,2423,1875],{"class":1874},[1606,2425,2426],{"class":1911},"(\n",[1606,2428,2430],{"class":1608,"line":2429},22,[1606,2431,2432],{"class":1630},"        `\n",[1606,2434,2436],{"class":1608,"line":2435},23,[1606,2437,2438],{"class":1616},"            mutation Create($input: CreateUserInput!) {\n",[1606,2440,2442],{"class":1608,"line":2441},24,[1606,2443,2444],{"class":1616},"                createUser(input: $input) {\n",[1606,2446,2448],{"class":1608,"line":2447},25,[1606,2449,2450],{"class":1616},"                    id\n",[1606,2452,2454],{"class":1608,"line":2453},26,[1606,2455,2456],{"class":1616},"                }\n",[1606,2458,2460],{"class":1608,"line":2459},27,[1606,2461,2359],{"class":1616},[1606,2463,2465,2468],{"class":1608,"line":2464},28,[1606,2466,2467],{"class":1630},"        `",[1606,2469,1935],{"class":1630},[1606,2471,2473],{"class":1608,"line":2472},29,[1606,2474,2334],{"class":1630},[1606,2476,2478,2481,2483,2485,2488,2490,2492,2495,2497,2499,2502,2504,2507],{"class":1608,"line":2477},30,[1606,2479,2480],{"class":1911},"            input",[1606,2482,1682],{"class":1630},[1606,2484,2231],{"class":1630},[1606,2486,2487],{"class":1911}," username",[1606,2489,1682],{"class":1630},[1606,2491,1631],{"class":1630},[1606,2493,2494],{"class":1616},"新用户",[1606,2496,1636],{"class":1630},[1606,2498,1727],{"class":1630},[1606,2500,2501],{"class":1911}," age",[1606,2503,1682],{"class":1630},[1606,2505,2506],{"class":1712}," 18",[1606,2508,1742],{"class":1630},[1606,2510,2512],{"class":1608,"line":2511},31,[1606,2513,2364],{"class":1630},[1606,2515,2517,2520],{"class":1608,"line":2516},32,[1606,2518,2519],{"class":1911},"    )",[1606,2521,1853],{"class":1630},[1606,2523,2525,2527,2529,2531],{"class":1608,"line":2524},33,[1606,2526,2421],{"class":1864},[1606,2528,2307],{"class":1874},[1606,2530,2042],{"class":1911},[1606,2532,1853],{"class":1630},[1606,2534,2536],{"class":1608,"line":2535},34,[1606,2537,1796],{"class":1630},[1606,2539,2541],{"class":1608,"line":2540},35,[1606,2542,1859],{"emptyLinePlaceholder":1858},[1606,2544,2546,2549,2551,2553,2556],{"class":1608,"line":2545},36,[1606,2547,2548],{"class":1874},"onMounted",[1606,2550,1878],{"class":1620},[1606,2552,2042],{"class":1630},[1606,2554,2555],{"class":1675}," =>",[1606,2557,1685],{"class":1630},[1606,2559,2561,2564,2566],{"class":1608,"line":2560},37,[1606,2562,2563],{"class":1874},"    loadUsers",[1606,2565,2042],{"class":1911},[1606,2567,1853],{"class":1630},[1606,2569,2571,2574,2576],{"class":1608,"line":2570},38,[1606,2572,2573],{"class":1630},"}",[1606,2575,1889],{"class":1620},[1606,2577,1853],{"class":1630},[1606,2579,2581,2584,2586],{"class":1608,"line":2580},39,[1606,2582,2583],{"class":1630},"\u003C/",[1606,2585,2217],{"class":1911},[1606,2587,2223],{"class":1630},[1606,2589,2591],{"class":1608,"line":2590},40,[1606,2592,1859],{"emptyLinePlaceholder":1858},[1606,2594,2596,2598,2601],{"class":1608,"line":2595},41,[1606,2597,2214],{"class":1630},[1606,2599,2600],{"class":1911},"template",[1606,2602,2223],{"class":1630},[1606,2604,2606,2609,2611],{"class":1608,"line":2605},42,[1606,2607,2608],{"class":1630},"    \u003C",[1606,2610,1566],{"class":1911},[1606,2612,2223],{"class":1630},[1606,2614,2616,2619,2621,2624,2626,2628,2631,2633,2636,2638,2640,2643,2645],{"class":1608,"line":2615},43,[1606,2617,2618],{"class":1630},"        \u003C",[1606,2620,1569],{"class":1911},[1606,2622,2623],{"class":1675}," v-for",[1606,2625,1844],{"class":1630},[1606,2627,1679],{"class":1630},[1606,2629,2630],{"class":1616},"item in users",[1606,2632,1679],{"class":1630},[1606,2634,2635],{"class":1675}," :key",[1606,2637,1844],{"class":1630},[1606,2639,1679],{"class":1630},[1606,2641,2642],{"class":1616},"item.id",[1606,2644,1679],{"class":1630},[1606,2646,2223],{"class":1630},[1606,2648,2650],{"class":1608,"line":2649},44,[1606,2651,2652],{"class":1620},"            {{ item.username }}（{{ item.age }} 岁）\n",[1606,2654,2656,2659,2661],{"class":1608,"line":2655},45,[1606,2657,2658],{"class":1630},"        \u003C/",[1606,2660,1569],{"class":1911},[1606,2662,2223],{"class":1630},[1606,2664,2666,2669,2671],{"class":1608,"line":2665},46,[1606,2667,2668],{"class":1630},"    \u003C/",[1606,2670,1566],{"class":1911},[1606,2672,2223],{"class":1630},[1606,2674,2676,2678,2681,2684,2686,2688,2691,2693,2696,2699,2701,2703],{"class":1608,"line":2675},47,[1606,2677,2608],{"class":1630},[1606,2679,2680],{"class":1911},"button",[1606,2682,2683],{"class":1675}," @click",[1606,2685,1844],{"class":1630},[1606,2687,1679],{"class":1630},[1606,2689,2690],{"class":1616},"addUser",[1606,2692,1679],{"class":1630},[1606,2694,2695],{"class":1630},">",[1606,2697,2698],{"class":1620},"新增用户",[1606,2700,2583],{"class":1630},[1606,2702,2680],{"class":1911},[1606,2704,2223],{"class":1630},[1606,2706,2708,2710,2712],{"class":1608,"line":2707},48,[1606,2709,2583],{"class":1630},[1606,2711,2600],{"class":1911},[1606,2713,2223],{"class":1630},[1531,2715,2716,2717,2719,2720,2722,2723,1575],{},"注意 ",[1543,2718,2690],{}," 里的写法：查询语句固定不动，动态值全部走 ",[1543,2721,1591],{},"，这正是第三篇讲的变量机制在前端的落地。改数据和查数据用的是同一个函数，只是查询语句换成了 ",[1543,2724,2725],{},"mutation",[1552,2727],{},[1526,2729,2731],{"id":2730},"错误处理与请求库选型","💡 错误处理与请求库选型",[1531,2733,2734,2735,1575],{},"GraphQL 的错误处理有个特别之处：",[1538,2736,2737],{},"业务错误不一定体现为 HTTP 错误码",[1531,2739,2740,2741,2743,2744,2746],{},"比如查询了一个不存在的字段，HTTP 状态码可能依然是 200，但返回体里没有 ",[1543,2742,1676],{},"，而是有 ",[1543,2745,2066],{}," 数组：",[1597,2748,2750],{"className":1658,"code":2749,"language":1660,"meta":1602,"style":1602},"{\n    \"errors\": [\n        { \"message\": \"Cannot query field \\\"hobbies\\\" on type \\\"User\\\".\" }\n    ]\n}\n",[1543,2751,2752,2756,2768,2810,2815],{"__ignoreMap":1602},[1606,2753,2754],{"class":1608,"line":1609},[1606,2755,1667],{"class":1630},[1606,2757,2758,2760,2762,2764,2766],{"class":1608,"line":1624},[1606,2759,1672],{"class":1630},[1606,2761,2066],{"class":1675},[1606,2763,1679],{"class":1630},[1606,2765,1682],{"class":1630},[1606,2767,1700],{"class":1630},[1606,2769,2770,2773,2775,2777,2779,2781,2783,2786,2789,2792,2794,2797,2799,2802,2804,2806,2808],{"class":1608,"line":1641},[1606,2771,2772],{"class":1630},"        {",[1606,2774,1709],{"class":1630},[1606,2776,2105],{"class":1612},[1606,2778,1679],{"class":1630},[1606,2780,1682],{"class":1630},[1606,2782,1709],{"class":1630},[1606,2784,2785],{"class":1616},"Cannot query field ",[1606,2787,2788],{"class":1620},"\\\"",[1606,2790,2791],{"class":1616},"hobbies",[1606,2793,2788],{"class":1620},[1606,2795,2796],{"class":1616}," on type ",[1606,2798,2788],{"class":1620},[1606,2800,2801],{"class":1616},"User",[1606,2803,2788],{"class":1620},[1606,2805,1984],{"class":1616},[1606,2807,1679],{"class":1630},[1606,2809,1778],{"class":1630},[1606,2811,2812],{"class":1608,"line":1703},[1606,2813,2814],{"class":1630},"    ]\n",[1606,2816,2817],{"class":1608,"line":1745},[1606,2818,1796],{"class":1630},[1531,2820,2821,2822,2825,2826,2828,2829,2831,2832,2838,2839,2842],{},"还有更常见的情况：",[1538,2823,2824],{},"部分成功","。比如用户列表查出来了，但某个字段取数失败，这时返回里 ",[1543,2827,1676],{}," 和 ",[1543,2830,2066],{}," 会同时存在。所以前端判断错误的标准做法是",[1538,2833,2834,2835,2837],{},"看返回体里的 ",[1543,2836,2066],{}," 字段","，而不是只看 HTTP 状态码，我们封装的 ",[1543,2840,2841],{},"graphqlRequest"," 就是这么做的。",[1531,2844,2845],{},"至于请求库，日常项目可以这样选：",[1566,2847,2848,2854],{},[1569,2849,2850,2853],{},[1538,2851,2852],{},"直接用 fetch","：像本文这样封装几十行代码，零依赖，中小项目完全够用。",[1569,2855,2856,2859],{},[1538,2857,2858],{},"Apollo Client","：专业的 GraphQL 客户端，自带缓存、加载状态管理等能力，查询量大、对缓存有要求的项目可以考虑引入，配合 Vue 有对应的组合式 API 封装。",[1531,2861,2862],{},"建议先用 fetch 把请求流程理解透，等真的遇到缓存之类的需求，再上专业客户端也不迟。",[1552,2864],{},[1526,2866,2868],{"id":2867},"小节总结","🧾 小节总结",[1566,2870,2871,2878,2884,2892,2898],{},[1569,2872,2873,2874,2877],{},"GraphQL 请求本质是 POST 请求，请求体是 ",[1543,2875,2876],{},"{ query, variables }"," 的 JSON。",[1569,2879,2880,2881,2883],{},"封装一个 ",[1543,2882,2841],{}," 函数统一发请求，业务代码只写查询语句和变量。",[1569,2885,2886,2887,2889,2890,1575],{},"查询和修改用同一个函数，区别只是语句写 ",[1543,2888,1587],{}," 还是 ",[1543,2891,2725],{},[1569,2893,2894,2895,2897],{},"判断错误看返回体的 ",[1543,2896,2066],{}," 字段，不能只看 HTTP 状态码；存在「部分成功」的情况。",[1569,2899,2900],{},"中小项目用 fetch 即可，有缓存等需求时再考虑 Apollo Client。",[1552,2902],{},[1526,2904,2906],{"id":2905},"知识问答","❓ 知识问答",[1531,2908,2909],{},[1538,2910,2911],{},"Q1：能用 GET 请求发 GraphQL 吗？",[1531,2913,2914],{},"规范上允许把 query 拼在 URL 上用 GET 查询，但实际开发中几乎都统一用 POST：语义清晰（Mutation 本来就不该用 GET），也不用担心 URL 长度限制。",[1531,2916,2917],{},[1538,2918,2919],{},"Q2：为什么不用 axios？",[1531,2921,2922],{},"完全可以，axios 发 POST 一样能调 GraphQL。本文用 fetch 是因为它零依赖、浏览器和 Node.js 都内置，项目里已经装了 axios 的话直接用它即可。",[1531,2924,2925],{},[1538,2926,2927],{},"Q3：页面切换时重复请求相同数据，怎么办？",[1531,2929,2930],{},"这正是 Apollo Client 这类客户端要解决的缓存问题。用 fetch 的话，可以自己用简单的键值缓存存查询结果，或者在 Pinia 里管理数据，按需选择。",[1531,2932,2933],{},[1538,2934,2935],{},"Q4：variables 可以不传吗？",[1531,2937,2938,2939,2942,2943,2945,2946,2949],{},"可以。查询语句里没有用到变量时，",[1543,2940,2941],{},"graphqlRequest(query)"," 直接省略第二个参数即可，请求体里的 ",[1543,2944,1591],{}," 会是 ",[1543,2947,2948],{},"undefined","，JSON.stringify 会自动忽略它。",[1531,2951,2952],{},[1538,2953,2954],{},"Q5：token 怎么带到请求头里？",[1531,2956,2957,2958,2960,2961,2964],{},"在 ",[1543,2959,2841],{}," 的 headers 里加上 ",[1543,2962,2963],{},"Authorization"," 字段，从 localStorage 或 Pinia 里取 token 拼进去即可，和 REST 项目的做法一致。",[1552,2966],{},[1526,2968,2970],{"id":2969},"小练习","🧪 小练习",[1531,2972,2973,2974,2976,2977,2980],{},"练习一：用封装好的 ",[1543,2975,2841],{}," 写一个 ",[1543,2978,2979],{},"getUserById(id)"," 函数，通过变量传 id，返回单个用户对象。",[1597,2982,2984],{"className":1828,"code":2983,"filename":1830,"language":1831,"meta":1602,"style":1602},"export async function getUserById(id) {\n    // 请在这里编写代码\n}\n",[1543,2985,2986,3006,3012],{"__ignoreMap":1602},[1606,2987,2988,2990,2992,2994,2997,2999,3002,3004],{"class":1608,"line":1609},[1606,2989,1865],{"class":1864},[1606,2991,1868],{"class":1675},[1606,2993,1871],{"class":1675},[1606,2995,2996],{"class":1874}," getUserById",[1606,2998,1878],{"class":1630},[1606,3000,3001],{"class":1881},"id",[1606,3003,1889],{"class":1630},[1606,3005,1685],{"class":1630},[1606,3007,3008],{"class":1608,"line":1624},[1606,3009,3011],{"class":3010},"syuKq","    // 请在这里编写代码\n",[1606,3013,3014],{"class":1608,"line":1641},[1606,3015,1796],{"class":1630},[1531,3017,3018,3019,3021,3022,3025],{},"练习二：给 ",[1543,3020,2206],{}," 加一个「删除」按钮，点击后调用 ",[1543,3023,3024],{},"deleteUser"," mutation，成功删除后刷新列表。",[1597,3027,3029],{"className":2204,"code":3028,"filename":2206,"language":2207,"meta":1602,"style":1602},"\u003Cscript setup>\nasync function removeUser(id) {\n    // 请在这里编写代码\n}\n\u003C/script>\n",[1543,3030,3031,3041,3058,3062,3066],{"__ignoreMap":1602},[1606,3032,3033,3035,3037,3039],{"class":1608,"line":1609},[1606,3034,2214],{"class":1630},[1606,3036,2217],{"class":1911},[1606,3038,2220],{"class":1675},[1606,3040,2223],{"class":1630},[1606,3042,3043,3045,3047,3050,3052,3054,3056],{"class":1608,"line":1624},[1606,3044,2302],{"class":1675},[1606,3046,1871],{"class":1675},[1606,3048,3049],{"class":1874}," removeUser",[1606,3051,1878],{"class":1630},[1606,3053,3001],{"class":1881},[1606,3055,1889],{"class":1630},[1606,3057,1685],{"class":1630},[1606,3059,3060],{"class":1608,"line":1641},[1606,3061,3011],{"class":3010},[1606,3063,3064],{"class":1608,"line":1703},[1606,3065,1796],{"class":1630},[1606,3067,3068,3070,3072],{"class":1608,"line":1745},[1606,3069,2583],{"class":1630},[1606,3071,2217],{"class":1911},[1606,3073,2223],{"class":1630},[1552,3075],{},[1531,3077,3078],{},"🎉 恭喜你已经掌握从前端到 GraphQL 服务的完整调用链路啦！至此，从 Schema 设计、查询、增删改到 Express 集成和前端调用，你已经具备了用 GraphQL 开发完整功能的能力，去实际项目里试试吧！",[3080,3081,3082],"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 pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}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 .s50WR, html code.shiki .s50WR{--shiki-light:#9C3EDA;--shiki-default:#C792EA;--shiki-dark:#C792EA}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .s8pZq, html code.shiki .s8pZq{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sK9QF, html code.shiki .sK9QF{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#EEFFFF;--shiki-default-font-style:italic;--shiki-dark:#BABED8;--shiki-dark-font-style:italic}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}",{"title":1602,"searchDepth":1624,"depth":1624,"links":3084},[3085,3086,3087,3088,3089,3090,3091,3092],{"id":1528,"depth":1624,"text":1529},{"id":1556,"depth":1624,"text":1557},{"id":1821,"depth":1624,"text":1822},{"id":2197,"depth":1624,"text":2198},{"id":2730,"depth":1624,"text":2731},{"id":2867,"depth":1624,"text":2868},{"id":2905,"depth":1624,"text":2906},{"id":2969,"depth":1624,"text":2970},"学会在前端项目中用 fetch 发起 GraphQL 请求，封装通用请求函数，并正确处理数据和错误。","md",null,{},{"title":1375},{"title":1521,"description":3093},"fRHVpJWOg2",[3101,3103],{"title":1371,"path":1372,"stem":1373,"description":3102,"children":-1},"学会把 Apollo Server 接入 Express 项目，让 GraphQL 和 REST 接口共存，并用 context 向 resolver 传递请求信息。",{"title":1385,"path":1386,"stem":1387,"description":3104,"children":-1},"了解为什么要读 Vue2 源码，掌握源码目录结构与本地调试环境的搭建方法。",1784715110053]