{"id":1044,"date":"2025-04-11T10:16:05","date_gmt":"2025-04-11T02:16:05","guid":{"rendered":"https:\/\/womeifei.cn\/?p=1044"},"modified":"2025-04-11T10:18:22","modified_gmt":"2025-04-11T02:18:22","slug":"2024web04-js%e8%ae%be%e8%ae%a1%e7%ae%a1%e9%81%93%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/womeifei.cn\/index.php\/2025\/04\/11\/2024web04-js%e8%ae%be%e8%ae%a1%e7%ae%a1%e9%81%93%e5%87%bd%e6%95%b0\/","title":{"rendered":"2024Web04—JS\u8bbe\u8ba1\u7ba1\u9053\u51fd\u6570"},"content":{"rendered":"\n

\u9700\u8981\u8bbe\u8ba1\u4e00\u4e2a Pipeline<\/code> \u7ba1\u9053\u51fd\u6570\uff0c\u7528\u4e8e\u63a7\u5236 360 \u5ea6\u5c55\u793a\u4ea7\u54c1\u7684\u52a8\u753b\u5e8f\u5217\uff0c\u901a\u8fc7\u7ba1\u9053\u8fde\u63a5\u5404\u4e2a\u52a8\u753b\u6b65\u9aa4\uff0c\u4f7f\u4ea7\u54c1\u4ee5\u6d41\u7545\u7684\u65b9\u5f0f\u5448\u73b0\u7ed9\u7528\u6237 \u6548\u679c\u5982\u4e0b<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u5c01\u88c5\u4e00\u4e2a\u652f\u6301\u5f02\u6b65\u7684 pipeline<\/code> \u7ba1\u9053\u51fd\u6570\uff0c\u80fd\u591f\u6309\u987a\u5e8f\u6267\u884c\u4e00\u7cfb\u5217\u5f02\u6b65\u64cd\u4f5c\uff0c\u6bcf\u4e2a\u5f02\u6b65\u64cd\u4f5c\u7684\u7ed3\u679c\u5c06\u4f5c\u4e3a\u4e0b\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\u7684\u8f93\u5165<\/strong><\/p>\n\n\n\n

\u5f85\u8865\u5145\u90e8\u5206<\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n

initalValue:\u521d\u59cb\u503c\uff0c\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u4efb\u52a1\u7684\u8f93\u5165<\/p>\n\n\n\n

sequence:\u4e00\u4e2a\u5305\u542b\u5f02\u6b65\u51fd\u6570\uff08\u6216\u8fd4\u56de Promise \u7684\u51fd\u6570\uff09\u7684\u6570\u7ec4<\/p>\n\n\n\n

\u89e3\u51b3\u601d\u8def<\/p>\n\n\n\n

(1)\u521d\u59cb\u5316\u53c2\u6570<\/p>\n\n\n\n

let param = initialValue\n<\/code><\/pre>\n\n\n\n
(2)\u521b\u5efaPromise<\/p>\n\n\n\n
return new Promise(async (res, rej) => { ... });<\/code><\/pre>\n\n\n\n
(3)\u904d\u5386\u4efb\u52a1\u6570\u7ec4<\/p>\n\n\n\n
for (let i = 0; i < sequence.length; i++) {\n    param = await sequence[i](param);\n}<\/code><\/pre>\n\n\n\n
    \n
  • \u5faa\u73af\u6267\u884c<\/strong>\uff1a\u4f9d\u6b21\u904d\u5386 sequence<\/code> \u4e2d\u7684\u6bcf\u4e2a\u51fd\u6570\u3002\n
      \n
    • sequence[i](param)<\/code><\/strong>\uff1a\u8c03\u7528\u5f53\u524d\u4efb\u52a1\u51fd\u6570\uff0c\u4f20\u5165\u524d\u4e00\u4e2a\u4efb\u52a1\u7684\u8f93\u51fa\u503c param<\/code>\u3002<\/li>\n\n\n\n
    • await<\/code><\/strong>\uff1a\u7b49\u5f85\u5f53\u524d\u4efb\u52a1\u5b8c\u6210\uff08\u5982\u679c\u662f\u5f02\u6b65\u4efb\u52a1\uff09\uff0c\u83b7\u53d6\u5176\u8fd4\u56de\u503c\u3002<\/li>\n\n\n\n
    • \u66f4\u65b0 param<\/code><\/strong>\uff1a\u5c06\u5f53\u524d\u4efb\u52a1\u7684\u8fd4\u56de\u503c\u8d4b\u7ed9 param<\/code>\uff0c\u4f9b\u4e0b\u4e00\u4e2a\u4efb\u52a1\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
      (4)\u8fd4\u56de\u6700\u7ec8\u7ed3\u679c<\/p>\n\n\n\n
      res(param)<\/code><\/pre>\n\n\n\n
       \u5173\u952e\u70b9<\/strong><\/h3>\n\n\n\n
        \n
      1. \u987a\u5e8f\u6267\u884c<\/strong>\uff1a
        \u4efb\u52a1\u4e25\u683c\u6309\u6570\u7ec4\u987a\u5e8f\u6267\u884c\uff0c\u524d\u4e00\u4e2a\u4efb\u52a1\u5b8c\u6210\u540e\u624d\u4f1a\u5f00\u59cb\u4e0b\u4e00\u4e2a\u4efb\u52a1\u3002<\/li>\n\n\n\n
      2. \u5f02\u6b65\u652f\u6301<\/strong>\uff1a
        \u6bcf\u4e2a\u4efb\u52a1\u53ef\u4ee5\u662f\u540c\u6b65\u51fd\u6570\u6216\u8fd4\u56de Promise<\/code> \u7684\u5f02\u6b65\u51fd\u6570\uff0c\u901a\u8fc7 await<\/code> \u7edf\u4e00\u5904\u7406\u3002<\/li>\n\n\n\n
      3. \u9519\u8bef\u5904\u7406<\/strong>\uff1a\n
          \n
        • \u5f53\u524d\u4ee3\u7801\u4e2d\uff0c\u5982\u679c\u67d0\u4e2a\u4efb\u52a1\u629b\u51fa\u9519\u8bef\uff0c\u4f1a\u76f4\u63a5\u5bfc\u81f4 Promise \u88ab\u62d2\u7edd\uff08reject<\/code>\uff09\uff0c\u4f46\u672a\u663e\u5f0f\u6355\u83b7\u9519\u8bef\u3002<\/li>\n\n\n\n
        • \u6539\u8fdb\u5efa\u8bae\uff1a\u5728 await<\/code> \u5916\u5305\u88f9 try-catch<\/code>\uff0c\u663e\u5f0f\u8c03\u7528 rej(error)<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • \u53c2\u6570\u4f20\u9012<\/strong>\uff1a
          \u6bcf\u4e2a\u4efb\u52a1\u7684\u8f93\u51fa\u503c\u4f1a\u4f5c\u4e3a\u4e0b\u4e00\u4e2a\u4efb\u52a1\u7684\u8f93\u5165\u503c\uff08\u7c7b\u4f3c\u7ba1\u9053\u64cd\u4f5c\uff09<\/li>\n<\/ol>\n\n\n\n
          \u793a\u4f8b\u6d41\u7a0b<\/p>\n\n\n\n
          const task1 = (x) => Promise.resolve(x + 1);\nconst task2 = (x) => Promise.resolve(x * 2);\nconst task3 = (x) => x - 3;\n\npipeline(5, [task1, task2, task3])\n    .then(result => console.log(result)); \/\/ \u8f93\u51fa: 9<\/code><\/pre>\n\n\n\n
          \u6267\u884c\u6b65\u9aa4\uff1a<\/p>\n\n\n\n
            \n
          1. \u521d\u59cb\u503c param = 5<\/code>\u3002<\/li>\n\n\n\n
          2. \u6267\u884c task1(5)<\/code> \u2192 \u8fd4\u56de 6<\/code>\uff0c\u66f4\u65b0 param = 6<\/code>\u3002<\/li>\n\n\n\n
          3. \u6267\u884c task2(6)<\/code> \u2192 \u8fd4\u56de 12<\/code>\uff0c\u66f4\u65b0 param = 12<\/code>\u3002<\/li>\n\n\n\n
          4. \u6267\u884c task3(12)<\/code> \u2192 \u8fd4\u56de 9<\/code>\uff0c\u66f4\u65b0 param = 9<\/code>\u3002<\/li>\n\n\n\n
          5. \u89e3\u6790 Promise\uff0c\u6700\u7ec8\u7ed3\u679c 9<\/code>\u3002<\/li>\n<\/ol>\n\n\n\n
            \u6700\u7ec8\u4ee3\u7801<\/p>\n\n\n\n
            const pipeline =(initialValue, sequence) => {\n    \/\/ TODO: \u5f85\u8865\u5145\u4ee3\u7801\n    let param = initialValue\n    return new Promise(async (res, rej)=>\n    {\n        for(let i = 0; i < sequence.length; i++)\n        {\n            param = await sequence[i](param)\n        }\n        res(param)\n    })\n   \n};<\/code><\/pre>\n\n\n\n
            \u4ee3\u7801\u4f18\u5316<\/strong> \u7531\u4e8e\u5185\u90e8\u5df2\u662f\u00a0async<\/code>\u00a0\u51fd\u6570\uff0c\u53ef\u76f4\u63a5\u8fd4\u56de\u00a0param<\/code>\uff0c\u65e0\u9700\u00a0new Promise<\/code><\/p>\n\n\n\n
            const pipeline = async (initialValue, sequence) => {\n    let param = initialValue;\n    for (const task of sequence) {\n        param = await task(param);\n    }\n    return param;\n};<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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