{"id":39318,"date":"2025-05-23T09:49:16","date_gmt":"2025-05-23T01:49:16","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/39318.html"},"modified":"2025-05-23T09:49:16","modified_gmt":"2025-05-23T01:49:16","slug":"javascript%e5%bc%82%e6%ad%a5%e7%bc%96%e7%a8%8b-async-await-%e4%bd%bf%e7%94%a8%e8%af%a6%e8%a7%a3%ef%bc%9a%e4%bb%8e%e5%8e%9f%e7%90%86%e5%88%b0%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/39318.html","title":{"rendered":"JavaScript\u5f02\u6b65\u7f16\u7a0b Async\/Await \u4f7f\u7528\u8be6\u89e3\uff1a\u4ece\u539f\u7406\u5230\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250523014915-682fd41b0869c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" width=\"700\" \/><\/p>\n<p>&#x1f337; \u53e4\u4e4b\u7acb\u5927\u4e8b\u8005&#xff0c;\u4e0d\u60df\u6709\u8d85\u4e16\u4e4b\u624d&#xff0c;\u4ea6\u5fc5\u6709\u575a\u5fcd\u4e0d\u62d4\u4e4b\u5fd7 &#x1f390; \u4e2a\u4ebaCSND\u4e3b\u9875\u2014\u2014Micro\u9ea6\u53ef\u4e50\u7684\u535a\u5ba2 &#x1f425;\u300aDocker\u5b9e\u64cd\u6559\u7a0b\u300b\u4e13\u680f\u4ee5\u6700\u65b0\u7684Centos\u7248\u672c\u4e3a\u57fa\u7840\u8fdb\u884cDocker\u5b9e\u64cd\u6559\u7a0b&#xff0c;\u5165\u95e8\u5230\u5b9e\u6218 &#x1f33a;\u300aRabbitMQ\u300b\u4e13\u680f19\u5e74\u7f16\u5199\u4e3b\u8981\u4ecb\u7ecd\u4f7f\u7528JAVA\u5f00\u53d1RabbitMQ\u7684\u7cfb\u5217\u6559\u7a0b&#xff0c;\u4ece\u57fa\u7840\u77e5\u8bc6\u5230\u9879\u76ee\u5b9e\u6218 &#x1f338;\u300a\u8bbe\u8ba1\u6a21\u5f0f\u300b\u4e13\u680f\u4ee5\u5b9e\u9645\u7684\u751f\u6d3b\u573a\u666f\u4e3a\u6848\u4f8b\u8fdb\u884c\u8bb2\u89e3&#xff0c;\u8ba9\u5927\u5bb6\u5bf9\u8bbe\u8ba1\u6a21\u5f0f\u6709\u4e00\u4e2a\u66f4\u6e05\u6670\u7684\u7406\u89e3 &#x1f31b;\u300a\u5f00\u6e90\u9879\u76ee\u300b\u672c\u4e13\u680f\u4e3b\u8981\u4ecb\u7ecd\u76ee\u524d\u70ed\u95e8\u7684\u5f00\u6e90\u9879\u76ee&#xff0c;\u5e26\u5927\u5bb6\u5feb\u901f\u4e86\u89e3\u5e76\u8f7b\u677e\u4e0a\u624b\u4f7f\u7528 \u2728\u300a\u5f00\u53d1\u6280\u5de7\u300b\u672c\u4e13\u680f\u5305\u542b\u4e86\u5404\u79cd\u7cfb\u7edf\u7684\u8bbe\u8ba1\u539f\u7406\u4ee5\u53ca\u6ce8\u610f\u4e8b\u9879&#xff0c;\u5e76\u5206\u4eab\u4e00\u4e9b\u65e5\u5e38\u5f00\u53d1\u7684\u529f\u80fd\u5c0f\u6280\u5de7 &#x1f495;\u300aJenkins\u5b9e\u6218\u300b\u4e13\u680f\u4e3b\u8981\u4ecb\u7ecdJenkins&#043;Docker\u7684\u5b9e\u6218\u6559\u7a0b&#xff0c;\u8ba9\u4f60\u5feb\u901f\u638c\u63e1\u9879\u76eeCI\/CD&#xff0c;\u662f2024\u5e74\u6700\u65b0\u7684\u5b9e\u6218\u6559\u7a0b &#x1f31e;\u300aSpring Boot\u300b\u4e13\u680f\u4e3b\u8981\u4ecb\u7ecd\u6211\u4eec\u65e5\u5e38\u5de5\u4f5c\u9879\u76ee\u4e2d\u7ecf\u5e38\u5e94\u7528\u5230\u7684\u529f\u80fd\u4ee5\u53ca\u6280\u5de7&#xff0c;\u4ee3\u7801\u6837\u4f8b\u5b8c\u6574 &#x1f31e;\u300aSpring Security\u300b\u4e13\u680f\u4e2d\u6211\u4eec\u5c06\u9010\u6b65\u6df1\u5165Spring Security\u7684\u5404\u4e2a\u6280\u672f\u7ec6\u8282&#xff0c;\u5e26\u4f60\u4ece\u5165\u95e8\u5230\u7cbe\u901a&#xff0c;\u5168\u9762\u638c\u63e1\u8fd9\u4e00\u5b89\u5168\u6280\u672f <font color=\"red\">\u5982\u679c\u6587\u7ae0\u80fd\u591f\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u5b9a\u7684\u5e2e\u52a9&#xff01;\u6b22\u8fce\u5173\u6ce8\u3001\u8bc4\u8bba\u4e92\u52a8&#xff5e;<\/font><\/p>\n<\/p>\n<h4>JavaScript\u5f02\u6b65\u7f16\u7a0b Async\/Await \u4f7f\u7528\u8be6\u89e3&#xff1a;\u4ece\u539f\u7406\u5230\u6700\u4f73\u5b9e\u8df5<\/h4>\n<ul>\n<li>1.\u80cc\u666f\u4e0e\u6982\u5ff5<\/li>\n<li>2. \u8bed\u6cd5\u8be6\u89e3<\/li>\n<li>\n<ul>\n<li>2.1 \u58f0\u660e\u4e0e\u8fd4\u56de\u503c<\/li>\n<li>2.2 \u4f7f\u7528 await \u6682\u505c\u6267\u884c<\/li>\n<li>2.3 \u9519\u8bef\u5904\u7406<\/li>\n<li>2.4 \u8bed\u6cd5\u89c4\u5219<\/li>\n<\/ul>\n<\/li>\n<li>3. \u5e76\u53d1\u4e0e\u6027\u80fd<\/li>\n<li>\n<ul>\n<li>3.1 \u987a\u5e8f\u7b49\u5f85 vs \u5e76\u884c\u7b49\u5f85<\/li>\n<li>3.2 \u5e76\u884c\u6267\u884c\u4f18\u5316<\/li>\n<li>3.2 \u9650\u5236\u5e76\u53d1\u6570\u91cf<\/li>\n<\/ul>\n<\/li>\n<li>4. \u5f02\u6b65\u8fed\u4ee3<\/li>\n<li>5 \u5e38\u89c1\u95ee\u9898\u89e3\u51b3\u65b9\u6848<\/li>\n<li>\n<ul>\n<li>5.1 \u8bf7\u6c42\u91cd\u8bd5\u673a\u5236<\/li>\n<li>5.2 \u7ade\u6001\u6761\u4ef6\u5904\u7406<\/li>\n<li>5.3 \u5f02\u6b65\u751f\u6210\u5668<\/li>\n<li>5.4 \u5904\u7406\u975e Promise \u503c<\/li>\n<li>5.5 \u5e38\u89c1\u9677\u9631<\/li>\n<\/ul>\n<\/li>\n<li>6. \u6027\u80fd\u4f18\u5316\u5b9e\u8df5<\/li>\n<li>\n<ul>\n<li>6.1 \u5185\u5b58\u7ba1\u7406<\/li>\n<li>6.2 \u4f18\u5148\u52a0\u8f7d\u4f18\u5316<\/li>\n<\/ul>\n<\/li>\n<li>7. \u7ed3\u8bed<\/li>\n<\/ul>\n<h2>1.\u80cc\u666f\u4e0e\u6982\u5ff5<\/h2>\n<p>\u5728\u4f20\u7edf JavaScript \u5f00\u53d1\u4e2d&#xff0c;\u5f00\u53d1\u8005\u957f\u671f\u9762\u4e34\u56de\u8c03\u5730\u72f1\u7684\u56f0\u6270\u3002\u968f\u7740 ES6 Promise \u7684\u51fa\u73b0&#xff0c;\u5f02\u6b65\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u5f97\u5230\u6539\u5584&#xff0c;\u4f46\u94fe\u5f0f\u8c03\u7528\u4f9d\u7136\u5b58\u5728\u5d4c\u5957\u95ee\u9898\u30022017 \u5e74 ES8 \u6b63\u5f0f\u5f15\u5165\u7684 Async\/Await \u8bed\u6cd5&#xff0c;\u8ba9\u5f02\u6b65\u4ee3\u7801\u7b2c\u4e00\u6b21\u62e5\u6709\u4e86\u540c\u6b65\u4ee3\u7801\u822c\u7684\u53ef\u8bfb\u6027\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250523014915-682fd41b3902c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>async \u51fd\u6570\u662f\u57fa\u4e8e Promise \u7684\u8bed\u6cd5\u7cd6&#xff0c;\u7528\u4e8e\u7b80\u5316\u5f02\u6b65\u64cd\u4f5c\u7684\u4e66\u5199\u65b9\u5f0f\u3002\u4f7f\u7528 async \u58f0\u660e\u7684\u51fd\u6570\u4f1a\u9690\u5f0f\u8fd4\u56de\u4e00\u4e2a Promise&#xff0c;\u51fd\u6570\u4f53\u5185\u90e8\u53ef\u4ee5\u901a\u8fc7 await \u6682\u505c\u6267\u884c&#xff0c;\u76f4\u5230\u5bf9\u5e94\u7684 Promise \u5b8c\u6210\u6216\u629b\u51fa\u9519\u8bef\u540e\u518d\u7ee7\u7eed\u6267\u884c\u3002 await \u64cd\u4f5c\u7b26\u53ea\u80fd\u5728 async \u51fd\u6570\u6216\u6a21\u5757\u9876\u5c42\u4e2d\u4f7f\u7528&#xff0c;\u7528\u4e8e\u7b49\u5f85\u4e00\u4e2a Promise \u89e3\u51b3&#xff0c;\u5e76\u5c06\u5176\u7ed3\u679c\u4f5c\u4e3a\u8868\u8fbe\u5f0f\u7684\u503c\u8fd4\u56de&#xff1b;\u5982\u679c Promise \u88ab\u62d2\u7edd&#xff0c;\u5219\u4f1a\u5728\u8be5\u4f4d\u7f6e\u629b\u51fa\u5f02\u5e38&#xff0c;\u53ef\u914d\u5408\u5e38\u89c4\u7684 try&#8230;catch \u8fdb\u884c\u6355\u83b7\u5904\u7406\u3002<\/p>\n<p>\u8fd9\u79cd\u5199\u6cd5\u6781\u5927\u5730\u63d0\u5347\u4e86\u5f02\u6b65\u4ee3\u7801\u7684\u53ef\u8bfb\u6027&#xff0c;\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u50cf\u7f16\u5199\u540c\u6b65\u4ee3\u7801\u4e00\u6837\u76f4\u89c2\u5730\u5904\u7406\u5f02\u6b65\u903b\u8f91&#xff0c;\u540c\u65f6\u4fdd\u7559\u4e86\u540e\u53f0\u5e76\u53d1\u6267\u884c\u7684\u4f18\u52bf\u3002<\/p>\n<hr \/>\n<h2>2. \u8bed\u6cd5\u8be6\u89e3<\/h2>\n<h3>2.1 \u58f0\u660e\u4e0e\u8fd4\u56de\u503c<\/h3>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">foo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token number\">42<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e0a\u4f8b\u4e2d&#xff0c; foo() \u4f1a\u8fd4\u56de\u4e00\u4e2a\u5df2\u89e3\u51b3&#xff08;fulfilled&#xff09;\u7684 Promise&#xff0c;\u5176\u503c\u4e3a 42&#xff1b;\u7b49\u4ef7\u4e8e&#xff1a;<\/p>\n<p><span class=\"token keyword\">function<\/span> <span class=\"token function\">foo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> Promise<span class=\"token punctuation\">.<\/span><span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">42<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u662f\u56e0\u4e3a\u4efb\u4f55 async \u51fd\u6570\u5185\u7684\u8fd4\u56de\u503c\u90fd\u4f1a\u88ab\u81ea\u52a8\u5c01\u88c5\u4e3a Promise<\/p>\n<h3>2.2 \u4f7f\u7528 await \u6682\u505c\u6267\u884c<\/h3>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">fetchData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> response <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/data&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> response<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> data<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4ee3\u7801\u89e3\u91ca&#xff1a;<\/p>\n<ul>\n<li>\u7b2c\u4e00\u884c\u7684 await fetch(&#8230;) \u4f1a\u6682\u505c fetchData \u7684\u6267\u884c&#xff0c;\u76f4\u5230 fetch \u8fd4\u56de\u7684 Promise \u5b8c\u6210&#xff0c;\u5e76\u5c06\u5176\u7ed3\u679c\u8d4b\u503c\u7ed9 response<\/li>\n<li>\u7b2c\u4e8c\u884c\u7684 await response.json() \u540c\u7406&#xff0c;\u7b49\u5f85\u89e3\u6790 JSON \u540e\u518d\u7ee7\u7eed\u6267\u884c<\/li>\n<li>\u5982\u679c\u4efb\u4e00 Promise \u62d2\u7edd&#xff0c;\u5219\u4f1a\u5728\u8be5 await \u4f4d\u7f6e\u629b\u51fa\u5f02\u5e38&#xff0c;\u53ef\u5728\u5916\u5c42\u4f7f\u7528 try&#8230;catch \u6355\u6349\u3002<\/li>\n<\/ul>\n<h3>2.3 \u9519\u8bef\u5904\u7406<\/h3>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">safeFetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> res <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/bad\/url&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> json <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> res<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> json<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8bf7\u6c42\u5931\u8d25&#xff1a;&#039;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">throw<\/span> err<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53ef\u518d\u6b21\u629b\u51fa\u6216\u8fd4\u56de\u9ed8\u8ba4\u503c<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e0a\u8ff0\u6a21\u5f0f\u4e0e\u540c\u6b65\u4ee3\u7801\u4e2d\u4f7f\u7528 try\u2026catch \u5b8c\u5168\u4e00\u81f4&#xff0c;\u5927\u5927\u7b80\u5316\u4e86\u57fa\u4e8e Promise \u94fe\u5f0f .catch() \u7684\u5199\u6cd5<\/p>\n<h3>2.4 \u8bed\u6cd5\u89c4\u5219<\/h3>\n<p>\u4e0b\u9762\u6211\u4eec\u770b\u770b\u6211\u4eec\u5e38\u7528\u7684\u4e00\u4e9b\u4f7f\u7528\u8bed\u6cd5<\/p>\n<p><span class=\"token comment\">\/\/ \u58f0\u660e\u5f02\u6b65\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">fetchUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span> name<span class=\"token operator\">:<\/span> <span class=\"token string\">&#039;Alice&#039;<\/span><span class=\"token punctuation\">,<\/span> age<span class=\"token operator\">:<\/span> <span class=\"token number\">28<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u81ea\u52a8\u5305\u88c5\u4e3aPromise<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528\u7bad\u5934\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">const<\/span> <span class=\"token function-variable function\">fetchData<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">async<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> res <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/data&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> res<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7acb\u5373\u8c03\u7528\u6a21\u5f0f<\/span><br \/>\n<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">async<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h2>3. \u5e76\u53d1\u4e0e\u6027\u80fd<\/h2>\n<h3>3.1 \u987a\u5e8f\u7b49\u5f85 vs \u5e76\u884c\u7b49\u5f85<\/h3>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b&#xff0c;\u8fde\u7eed\u7684 await \u4f1a\u4e32\u884c\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token keyword\">let<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">task1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">let<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">task2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u82e5\u4e24\u8005\u4e92\u4e0d\u4f9d\u8d56&#xff0c;\u53ef\u6539\u4e3a\u5e76\u884c&#xff1a;<\/p>\n<p><span class=\"token keyword\">let<\/span> <span class=\"token punctuation\">[<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> Promise<span class=\"token punctuation\">.<\/span><span class=\"token function\">all<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token function\">task1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">task2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>3.2 \u5e76\u884c\u6267\u884c\u4f18\u5316<\/h3>\n<p>\u901a\u8fc7\u4e0a\u9762 \u987a\u5e8f\u7b49\u5f85 vs \u5e76\u884c\u7b49\u5f85 \u7684\u4ecb\u7ecd&#xff0c;\u901a\u5e38\u6211\u4eec\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u5f62\u5f0f\u6765\u8fdb\u884c\u4f18\u5316&#xff08;\u6a21\u62df\u8bf7\u6c42&#xff09;<\/p>\n<p><span class=\"token comment\">\/\/ \u987a\u5e8f\u6267\u884c&#xff08;\u603b\u8017\u65f6 &#061; \u5404\u8bf7\u6c42\u8017\u65f6\u4e4b\u548c&#xff09;<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">serialRequests<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> res1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/1&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> res2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/2&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token keyword\">await<\/span> res1<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">await<\/span> res2<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5e76\u884c\u6267\u884c&#xff08;\u603b\u8017\u65f6 \u2248 \u6700\u6162\u8bf7\u6c42\u8017\u65f6&#xff09;<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">parallelRequests<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>res1<span class=\"token punctuation\">,<\/span> res2<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> Promise<span class=\"token punctuation\">.<\/span><span class=\"token function\">all<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><br \/>\n    <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/1&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/2&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">await<\/span> Promise<span class=\"token punctuation\">.<\/span><span class=\"token function\">all<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span>res1<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> res2<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>3.2 \u9650\u5236\u5e76\u53d1\u6570\u91cf<\/h3>\n<p>\u5728\u9700\u8981\u5bf9\u5927\u91cf\u5f02\u6b65\u4efb\u52a1\u8fdb\u884c\u9650\u6d41\u65f6&#xff0c;\u53ef\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93&#xff08;\u5982 p-limit&#xff09;\u6216\u81ea\u5df1\u5b9e\u73b0\u7b80\u5355\u961f\u5217&#xff0c;\u907f\u514d\u4e00\u6b21\u6027\u53d1\u8d77\u8fc7\u591a\u8bf7\u6c42\u5bfc\u81f4\u8d44\u6e90\u7ade\u4e89\u6216\u7f51\u7edc\u62e5\u5835<\/p>\n<hr \/>\n<h2>4. \u5f02\u6b65\u8fed\u4ee3<\/h2>\n<p>ES2018 \u5f15\u5165\u4e86 for await&#8230;of&#xff0c;\u7528\u4e8e\u904d\u5386\u5f02\u6b65\u53ef\u8fed\u4ee3\u5bf9\u8c61&#xff08;\u5982\u5f02\u6b65\u751f\u6210\u5668&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">gen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">yield<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchChunk<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">yield<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchChunk<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">async<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">for<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> chunk <span class=\"token keyword\">of<\/span> <span class=\"token function\">gen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>chunk<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8be5\u8bed\u6cd5\u5728\u5904\u7406\u6d41\u5f0f\u6570\u636e&#xff08;\u4f8b\u5982\u6587\u4ef6\u5206\u5757\u4e0b\u8f7d&#xff09;\u65f6\u975e\u5e38\u6709\u7528<\/p>\n<hr \/>\n<h2>5 \u5e38\u89c1\u95ee\u9898\u89e3\u51b3\u65b9\u6848<\/h2>\n<h3>5.1 \u8bf7\u6c42\u91cd\u8bd5\u673a\u5236<\/h3>\n<p>\u5728\u5916\u9762\u65e5\u5e38\u5f00\u53d1\u4e2d&#xff0c;\u4f1a\u9047\u5230\u8bf7\u6c42\u5931\u8d25\u9700\u8981\u91cd\u8bd5\u7684\u9700\u6c42&#xff0c;\u6765\u770b\u770b\u4ee5\u4e0b\u6a21\u62df\u4ee3\u7801<\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">fetchWithRetry<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">url<span class=\"token punctuation\">,<\/span> retries <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> retries<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">const<\/span> res <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">await<\/span> res<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;&#061;<\/span> retries <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throw<\/span> err<span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">await<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Promise<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">r<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/span>r<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1000<\/span> <span class=\"token operator\">*<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>5.2 \u7ade\u6001\u6761\u4ef6\u5904\u7406<\/h3>\n<p>\u5f53\u591a\u4e2a\u8bf7\u6c42\u5e76\u53d1\u6267\u884c\u65f6&#xff0c;\u53ef\u80fd\u56e0\u7f51\u7edc\u5ef6\u8fdf\u3001\u670d\u52a1\u5668\u54cd\u5e94\u901f\u5ea6\u5dee\u5f02\u7b49\u95ee\u9898\u5bfc\u81f4\u54cd\u5e94\u987a\u5e8f\u4e0e\u53d1\u9001\u987a\u5e8f\u4e0d\u4e00\u81f4\u95ee\u9898\u3002 \u66f4\u8be6\u7ec6\u8bb2\u89e3\u53ef\u4ee5\u67e5\u9605\u535a\u4e3b\u5199\u8fc7\u4e00\u7bc7\u3010 \u524d\u7aef\u8bf7\u6c42\u4e71\u5e8f\u95ee\u9898\u5206\u6790\u4e0eAbortController\u3001async\/await\u3001Promise.all\u7b49\u89e3\u51b3\u65b9\u6848\u3011<\/p>\n<p>\u4ee5\u4e0b\u4ec5\u5c55\u73b0\u5b9e\u73b0\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token keyword\">let<\/span> lastController <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">search<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">query<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u53d6\u6d88\u524d\u4e00\u4e2a\u672a\u5b8c\u6210\u7684\u8bf7\u6c42<\/span><br \/>\n  <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>lastController<span class=\"token punctuation\">)<\/span> lastController<span class=\"token punctuation\">.<\/span><span class=\"token function\">abort<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">const<\/span> controller <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">AbortController<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  lastController <span class=\"token operator\">&#061;<\/span> controller<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> res <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\/api\/search?q&#061;<\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>query<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      signal<span class=\"token operator\">:<\/span> controller<span class=\"token punctuation\">.<\/span>signal<br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">await<\/span> res<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>err<span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token string\">&#039;AbortError&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throw<\/span> err<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>5.3 \u5f02\u6b65\u751f\u6210\u5668<\/h3>\n<p>\u5728 \u00b7async function*\u00b7 \u4e2d&#xff0c;\u4f60\u65e2\u53ef\u4ee5\u4f7f\u7528 \u00b7await\u00b7&#xff0c;\u4e5f\u53ef\u4ee5\u4f7f\u7528 \u00b7yield\u00b7&#xff0c;<font color=\"red\">\u5c06\u5f02\u6b65\u4efb\u52a1\u4e0e\u61d2\u52a0\u8f7d\u7ed3\u5408<\/font>&#xff1a;<\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">asyncGenerator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">await<\/span> <span class=\"token function\">delay<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">yield<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u79cd\u65b9\u5f0f\u9002\u5408\u6309\u9700\u83b7\u53d6\u5f02\u6b65\u6570\u636e&#xff0c;\u63d0\u9ad8\u8d44\u6e90\u5229\u7528\u7387<\/p>\n<h3>5.4 \u5904\u7406\u975e Promise \u503c<\/h3>\n<p>await \u540e\u53ef\u4ee5\u8ddf\u4efb\u610f\u8868\u8fbe\u5f0f&#xff0c;\u5982\u679c\u5176\u503c\u4e0d\u662f Promise&#xff0c;\u5219\u4f1a\u88ab\u5305\u88c5\u4e3a\u7acb\u5373\u89e3\u51b3\u7684 Promise\u3002\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">let<\/span> x <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token number\">123<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u76f8\u5f53\u4e8e await Promise.resolve(123)<\/span><\/p>\n<p>\u4f46\u5efa\u8bae\u5bf9<font color=\"red\">\u975e\u5f02\u6b65\u64cd\u4f5c\u907f\u514d\u4f7f\u7528 await&#xff0c;\u4ee5\u514d\u8bef\u5bfc<\/font><\/p>\n<h3>5.5 \u5e38\u89c1\u9677\u9631<\/h3>\n<li>\u9057\u5fd8 await&#xff1a;\u8c03\u7528 async \u51fd\u6570\u4f46\u672a\u52a0 await&#xff0c;\u4f1a\u5f97\u5230\u672a\u51b3&#xff08;pending&#xff09;\u7684 Promise \u800c\u975e\u9884\u671f\u7ed3\u679c<\/li>\n<li>\u5728\u975e async \u73af\u5883\u4f7f\u7528 await&#xff1a;\u4ec5\u5728\u6a21\u5757\u9876\u5c42\u6216 async \u51fd\u6570\u5185\u90e8\u53ef\u7528&#xff0c;\u5426\u5219\u4f1a\u629b\u8bed\u6cd5\u9519\u8bef<\/li>\n<li>Promise.all \u4e2d\u5355\u4e2a\u5931\u8d25\u5bfc\u81f4\u6574\u4f53\u5931\u8d25&#xff1a;\u82e5\u9700\u8981\u5bb9\u5fcd\u90e8\u5206\u5931\u8d25&#xff0c;\u53ef\u5bf9\u5185\u90e8 Promise \u4f7f\u7528 .catch() \u5904\u7406&#xff0c;\u907f\u514d\u6574\u4f53\u62d2\u7edd<\/li>\n<li>\u6ee5\u7528\u5e76\u53d1&#xff1a;\u540c\u65f6\u53d1\u8d77\u8fc7\u591a\u7f51\u7edc\u8bf7\u6c42\u53ef\u80fd\u89e6\u53d1\u9650\u6d41\u6216\u963b\u585e&#xff0c;\u5efa\u8bae\u6839\u636e\u573a\u666f\u8c03\u6574\u5e76\u53d1\u7b56\u7565<\/li>\n<hr \/>\n<h2>6. \u6027\u80fd\u4f18\u5316\u5b9e\u8df5<\/h2>\n<p>\u535a\u4e3b\u8fd9\u91cc\u4f8b\u4e3e\u4e24\u4e2a\u4f18\u5316\u7684\u6848\u4f8b&#xff1a;\u5185\u5b58\u7ba1\u7406\u4ee5\u53ca\u4f18\u5148\u52a0\u8f7d\u4f18\u5316<\/p>\n<h3>6.1 \u5185\u5b58\u7ba1\u7406<\/h3>\n<p>\u5e38\u89c1\u4e00\u4e9b\u5927\u91cf\u6570\u636e\u7684\u83b7\u53d6\u4e0b\u8f7d<\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">processLargeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">getHugeData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5927\u6570\u636e\u91cf<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u5206\u5757\u5904\u7406<\/span><br \/>\n  <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">let<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> data<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">const<\/span> chunk <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">.<\/span><span class=\"token function\">slice<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">await<\/span> <span class=\"token function\">processChunk<\/span><span class=\"token punctuation\">(<\/span>chunk<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    data<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53ca\u65f6\u91ca\u653e\u5185\u5b58<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>6.2 \u4f18\u5148\u52a0\u8f7d\u4f18\u5316<\/h3>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">loadCriticalResources<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u9884\u52a0\u8f7d\u975e\u5173\u952e\u8d44\u6e90<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> nonCritical <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fetch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/non-critical&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">r<\/span> <span class=\"token operator\">&#061;&gt;<\/span> r<span class=\"token punctuation\">.<\/span><span class=\"token function\">json<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u4f18\u5148\u5904\u7406\u5173\u952e\u8d44\u6e90<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> user <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> config <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u7b49\u5f85\u975e\u5173\u952e\u8d44\u6e90<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> nonCritical<span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">{<\/span> user<span class=\"token punctuation\">,<\/span> config<span class=\"token punctuation\">,<\/span> data <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h2>7. \u7ed3\u8bed<\/h2>\n<p>Async\/Await \u7684\u5f15\u5165\u5f7b\u5e95\u6539\u53d8\u4e86 JavaScript \u5f02\u6b65\u7f16\u7a0b\u7684\u9762\u8c8c\u3002\u901a\u8fc7\u672c\u6587\u7684\u8bb2\u89e3&#xff0c;\u76f8\u4fe1\u5c0f\u4f19\u4f34\u4eec\u53ef\u4ee5\u638c\u63e1 Async\/Await \u7684\u4f7f\u7528\u7cbe\u9ad3&#xff0c;\u5c06\u4f7f\u60a8\u7684 JavaScript \u4ee3\u7801\u5728\u4fdd\u6301\u9ad8\u6027\u80fd\u7684\u540c\u65f6&#xff0c;\u83b7\u5f97\u8d28\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u63d0\u5347\u3002<\/p>\n<p>\u5982\u679c\u4f60\u5728\u5b9e\u8df5\u8fc7\u7a0b\u4e2d\u6709\u4efb\u4f55\u7591\u95ee\u6216\u66f4\u597d\u7684\u6269\u5c55\u601d\u8def&#xff0c;\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u8a00&#xff0c;\u6700\u540e\u5e0c\u671b\u5927\u5bb6 <font color=\"red\">\u4e00\u952e\u4e09\u8fde<\/font> \u7ed9\u535a\u4e3b\u4e00\u70b9\u70b9\u9f13\u52b1&#xff01;<\/p>\n<hr \/>\n<p>\u524d\u7aef\u6280\u672f\u4e13\u680f\u56de\u987e&#xff1a;<\/p>\n<p>01\u3010\u524d\u7aef\u6280\u672f\u3011 ES6 \u4ecb\u7ecd\u53ca\u5e38\u7528\u8bed\u6cd5\u8bf4\u660e 02\u3010\u524d\u7aef\u6280\u672f\u3011\u6807\u7b7e\u9875\u901a\u8baflocalStorage\u3001BroadcastChannel\u3001SharedWorker\u7684\u6280\u672f\u8be6\u89e3 03 \u524d\u7aef\u8bf7\u6c42\u4e71\u5e8f\u95ee\u9898\u5206\u6790\u4e0eAbortController\u3001async\/await\u3001Promise.all\u7b49\u89e3\u51b3\u65b9\u6848 04 \u524d\u7aef\u5f00\u53d1\u4e2d\u6df1\u62f7\u8d1d\u7684\u5faa\u73af\u5f15\u7528\u95ee\u9898&#xff1a;\u4ece\u95ee\u9898\u590d\u73b0\u5230\u5b8c\u7f8e\u89e3\u51b3 05 \u524d\u7aefAJAX\u8bf7\u6c42\u4e0a\u4f20\u4e0b\u8f7d\u8fdb\u5ea6\u76d1\u63a7\u6307\u5357\u8be6\u89e3\u4e0e\u5b8c\u6574\u4ee3\u7801\u793a\u4f8b 06 TypeScript \u8fdb\u9636\u6307\u5357 &#8211; \u4f7f\u7528\u6cdb\u578b\u4e0ekeyof\u7ea6\u675f\u53c2\u6570 07 \u524d\u7aef\u5b9e\u73b0\u89c6\u9891\u6587\u4ef6\u52a8\u753b\u5e27\u56fe\u7247\u63d0\u53d6\u5168\u653b\u7565 &#8211; \u9644\u5b8c\u6574\u4ee3\u7801\u6837\u4f8b 08 \u524d\u7aef\u51fd\u6570\u9632\u6296&#xff08;Debounce&#xff09;\u5b8c\u6574\u8bb2\u89e3 &#8211; \u4ece\u539f\u7406\u3001\u5e94\u7528\u5230\u5b8c\u6574\u5b9e\u73b0 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250523014915-682fd41b83270.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb3.1k\u6b21\uff0c\u70b9\u8d5e82\u6b21\uff0c\u6536\u85cf86\u6b21\u3002\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86JavaScript\u4e2d\u7684\u5f02\u6b65\u7f16\u7a0b\u6280\u672fAsync\/Await\uff0c\u4ece\u80cc\u666f\u6982\u5ff5\u5230\u5b9e\u9645\u5e94\u7528\uff0c\u6db5\u76d6\u4e86\u8bed\u6cd5\u8be6\u89e3\u3001\u5e76\u53d1\u4f18\u5316\u3001\u9519\u8bef\u5904\u7406\u3001\u5f02\u6b65\u8fed\u4ee3\u53ca\u5e38\u89c1\u95ee\u9898\u89e3\u51b3\u65b9\u6848\u3002Async\/Await\u8ba9\u5f02\u6b65\u4ee3\u7801\u5177\u5907\u540c\u6b65\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\uff0c\u7b80\u5316\u4e86\u56de\u8c03\u5730\u72f1\u548cPromise\u94fe\u5f0f\u8c03\u7528\u7684\u590d\u6742\u6027\u3002\u6587\u7ae0\u8fd8\u63a2\u8ba8\u4e86\u987a\u5e8f\u7b49\u5f85\u4e0e\u5e76\u884c\u7b49\u5f85\u7684\u533a\u522b\uff0c\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f18\u5316\u5e76\u53d1\u6267\u884c\u3001\u9650\u5236\u5e76\u53d1\u6570\u91cf\uff0c\u5e76\u63d0\u4f9b\u4e86\u8bf7\u6c42\u91cd\u8bd5\u673a\u5236\u548c\u7ade\u6001\u6761\u4ef6\u5904\u7406\u7684\u5b9e\u7528\u4ee3\u7801\u793a\u4f8b\u3002\u901a\u8fc7Async\/Await\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u66f4\u76f4\u89c2\u5730\u5904\u7406\u5f02\u6b65\u903b\u8f91\uff0c\u63d0\u5347\u4ee3\u7801\u53ef\u7ef4\u62a4\u6027\u4e0e\u6027\u80fd\u3002_java 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