{"id":111412,"date":"2026-10-01T04:08:51","date_gmt":"2026-09-30T20:08:51","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/111412.html"},"modified":"2026-10-01T04:08:51","modified_gmt":"2026-09-30T20:08:51","slug":"%e3%80%90harmonyos%e5%bc%80%e5%8f%91%e5%b0%8f%e5%ae%9e%e8%b7%b5%e3%80%91%e5%bc%82%e6%ad%a5%e5%b9%b6%e5%8f%91promise-%e5%92%8c-async-await-%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/111412.html","title":{"rendered":"\u3010HarmonyOS\u5f00\u53d1\u5c0f\u5b9e\u8df5\u3011\u5f02\u6b65\u5e76\u53d1Promise \u548c async\/await \u600e\u4e48\u7528"},"content":{"rendered":"<h2>\u5f02\u6b65\u5e76\u53d1Promise \u548c async\/await \u600e\u4e48\u7528<\/h2>\n<p>\u7f51\u7edc\u8bf7\u6c42\u3001\u6587\u4ef6\u8bfb\u5199\u3001\u5b9a\u65f6\u5668&#xff0c;\u8fd9\u4e9b\u64cd\u4f5c\u6709\u4e2a\u5171\u540c\u70b9&#xff1a;\u53d1\u8d77\u4e4b\u540e\u4e0d\u80fd\u7acb\u523b\u62ff\u5230\u7ed3\u679c&#xff0c;\u5f97\u7b49\u3002\u7b49\u7684\u65f6\u5019\u8981\u662f\u628a\u4e3b\u7ebf\u7a0b\u5361\u4f4f&#xff0c;UI \u5c31\u51bb\u4f4f\u4e0d\u52a8\u4e86\u3002\u6240\u4ee5\u8fd9\u4e9b\u64cd\u4f5c\u5f97\u5f02\u6b65\u2014\u2014\u53d1\u8d77\u540e\u5148\u8ba9\u4e3b\u7ebf\u7a0b\u5e72\u522b\u7684&#xff0c;\u7ed3\u679c\u56de\u6765\u518d\u5904\u7406\u3002ArkTS \u5904\u7406\u5f02\u6b65\u7684\u4e3b\u8981\u624b\u6bb5\u5c31\u662f Promise \u548c async\/await&#xff0c;\u8fd9\u4fe9\u662f\u6807\u51c6 JS \u5f02\u6b65\u8bed\u6cd5&#xff0c;\u5728 ArkTS \u91cc\u7528\u6cd5\u57fa\u672c\u4e00\u81f4\u3002\u8fd9\u7bc7\u628a\u5f02\u6b65\u5e76\u53d1\u7684\u6982\u5ff5\u3001Promise \u7684\u72b6\u6001\u673a\u5236\u3001async\/await \u7684\u7528\u6cd5&#xff0c;\u4ee5\u53ca\u9519\u8bef\u5904\u7406\u8bb2\u900f&#xff0c;\u914d\u4e0a\u80fd\u8dd1\u7684\u4ee3\u7801\u3002<\/p>\n<h3>\u5f02\u6b65\u5e76\u53d1\u662f\u4ec0\u4e48<\/h3>\n<p>\u5f02\u6b65\u5e76\u53d1\u662f\u4e00\u79cd\u7f16\u7a0b\u8bed\u8a00\u7684\u7279\u6027&#xff0c;\u5141\u8bb8\u7a0b\u5e8f\u5728\u6267\u884c\u67d0\u4e9b\u64cd\u4f5c\u65f6\u4e0d\u5fc5\u7b49\u5f85\u5176\u5b8c\u6210&#xff0c;\u53ef\u4ee5\u7ee7\u7eed\u6267\u884c\u5176\u4ed6\u5f02\u6b65\u4ee3\u7801\u3002\u5f02\u6b65\u4ee3\u7801\u6267\u884c\u65f6\u4f1a\u88ab\u6302\u8d77&#xff0c;\u5728\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u540e\u6062\u590d\u6267\u884c&#xff0c;\u786e\u4fdd\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u6bb5\u4ee3\u7801\u5728\u8fd0\u884c\u3002<\/p>\n<p>\u6ce8\u610f\u8fd9\u91cc\u7684\u5173\u952e\u70b9&#xff1a;\u201c\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u6bb5\u4ee3\u7801\u5728\u8fd0\u884c\u201d\u3002\u5f02\u6b65\u5e76\u53d1\u4e0d\u662f\u591a\u7ebf\u7a0b&#xff0c;\u4e0d\u662f\u771f\u7684\u540c\u65f6\u8dd1\u4e24\u6bb5\u4ee3\u7801\u3002\u5b83\u662f\u5355\u7ebf\u7a0b\u4e0b\u7684\u8c03\u5ea6\u2014\u2014\u9047\u5230\u8981\u7b49\u7684\u64cd\u4f5c\u5c31\u6302\u8d77\u5f53\u524d\u4ee3\u7801&#xff0c;\u53bb\u6267\u884c\u522b\u7684\u4ee3\u7801&#xff0c;\u7b49\u64cd\u4f5c\u5b8c\u6210\u4e86\u518d\u56de\u6765\u7ee7\u7eed\u3002<\/p>\n<p>\u5178\u578b\u7684\u5f02\u6b65\u5e76\u53d1\u4f7f\u7528\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>I\/O \u975e\u963b\u585e\u64cd\u4f5c&#xff1a;\u7f51\u7edc\u8bf7\u6c42\u3001\u6587\u4ef6\u8bfb\u5199\u3001\u5b9a\u65f6\u5668\u7b49<\/li>\n<li>\u4efb\u52a1\u8f7b\u91cf\u4e14\u65e0 CPU \u963b\u585e&#xff1a;\u5355\u6b21\u4efb\u52a1\u6267\u884c\u65f6\u95f4\u77ed<\/li>\n<li>\u903b\u8f91\u4f9d\u8d56\u6e05\u6670&#xff1a;\u4efb\u52a1\u6709\u660e\u786e\u7684\u987a\u5e8f\u6216\u5e76\u884c\u5173\u7cfb<\/li>\n<\/ul>\n<p>\u5982\u679c\u662f CPU \u5bc6\u96c6\u7684\u8017\u65f6\u8ba1\u7b97&#xff0c;\u5f02\u6b65\u5e76\u53d1\u5e2e\u4e0d\u4e86\u4f60\u2014\u2014\u8ba1\u7b97\u65f6 CPU \u5728\u8f6c&#xff0c;\u6ca1\u6cd5\u8ba9\u51fa\u53bb\u3002\u90a3\u79cd\u5f97\u7528\u591a\u7ebf\u7a0b&#xff0c;\u662f\u540e\u9762\u6587\u7ae0\u8bb2\u7684\u5185\u5bb9\u3002<\/p>\n<h3>Promise&#xff1a;\u5f02\u6b65\u64cd\u4f5c\u7684\u5bf9\u8c61\u5316<\/h3>\n<p>Promise \u662f\u4e00\u79cd\u7528\u4e8e\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\u7684\u5bf9\u8c61&#xff0c;\u628a\u5f02\u6b65\u64cd\u4f5c\u5305\u88c5\u6210\u5bf9\u8c61&#xff0c;\u53ef\u4ee5\u50cf\u540c\u6b65\u64cd\u4f5c\u90a3\u6837\u5199\u4ee3\u7801\u3002\u5b83\u901a\u8fc7\u72b6\u6001\u673a\u5236\u7ba1\u7406\u5f02\u6b65\u64cd\u4f5c\u7684\u4e0d\u540c\u9636\u6bb5\u3002<\/p>\n<h4>Promise \u7684\u4e09\u79cd\u72b6\u6001<\/h4>\n<p>Promise \u6709\u4e09\u79cd\u72b6\u6001&#xff1a;<\/p>\n<ul>\n<li>pending&#xff1a;\u8fdb\u884c\u4e2d\u3002\u521a\u521b\u5efa\u65f6\u7684\u72b6\u6001<\/li>\n<li>fulfilled&#xff1a;\u5df2\u5b8c\u6210&#xff08;\u4e5f\u53eb resolved&#xff09;\u3002\u5f02\u6b65\u64cd\u4f5c\u6210\u529f<\/li>\n<li>rejected&#xff1a;\u5df2\u62d2\u7edd\u3002\u5f02\u6b65\u64cd\u4f5c\u5931\u8d25<\/li>\n<\/ul>\n<p>\u72b6\u6001\u8f6c\u6362\u662f\u5355\u5411\u4e0d\u53ef\u9006\u7684&#xff1a;pending \u53ef\u4ee5\u53d8\u6210 fulfilled \u6216 rejected&#xff0c;\u4f46\u53d8\u4e86\u5c31\u53d8\u4e0d\u56de\u6765&#xff0c;\u4e5f\u4e0d\u4f1a\u4ece fulfilled \u53d8\u6210 rejected\u3002<\/p>\n<p>#mermaid-svg-2vEbeMaCL3dPWZKD{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-2vEbeMaCL3dPWZKD .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-2vEbeMaCL3dPWZKD .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-2vEbeMaCL3dPWZKD .error-icon{fill:#552222;}#mermaid-svg-2vEbeMaCL3dPWZKD .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-2vEbeMaCL3dPWZKD .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-2vEbeMaCL3dPWZKD .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-2vEbeMaCL3dPWZKD 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rect{fill:#fff5ad;stroke:#aaaa33;stroke-width:1px;rx:0;ry:0;}#mermaid-svg-2vEbeMaCL3dPWZKD .statediagram-note text{fill:black;}#mermaid-svg-2vEbeMaCL3dPWZKD .statediagram-note .nodeLabel{color:black;}#mermaid-svg-2vEbeMaCL3dPWZKD .statediagram .edgeLabel{color:red;}#mermaid-svg-2vEbeMaCL3dPWZKD #dependencyStart,#mermaid-svg-2vEbeMaCL3dPWZKD #dependencyEnd{fill:#333333;stroke:#333333;stroke-width:1;}#mermaid-svg-2vEbeMaCL3dPWZKD .statediagramTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-2vEbeMaCL3dPWZKD :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span class=\"edgeLabel\"><\/p>\n<p>\u521b\u5efa Promise<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/p>\n<p>resolve() \u8c03\u7528<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/p>\n<p>reject() \u8c03\u7528<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\"><\/p>\n<p>pending<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>fulfilled<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>rejected<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u8fdb\u884c\u4e2d&#xff0c;\u7b49\u5f85\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u64cd\u4f5c\u6210\u529f&#xff0c;\u7ed3\u679c\u53ef\u7528<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u64cd\u4f5c\u5931\u8d25&#xff0c;\u9519\u8bef\u53ef\u7528<\/p>\n<p><\/span><\/p>\n<h4>\u521b\u5efa Promise<\/h4>\n<p>\u6700\u57fa\u672c\u7684\u7528\u6cd5\u662f\u901a\u8fc7\u6784\u9020\u51fd\u6570\u5b9e\u4f8b\u5316\u4e00\u4e2a Promise \u5bf9\u8c61&#xff0c;\u4f20\u5165\u4e00\u4e2a\u5e26\u6709\u4e24\u4e2a\u53c2\u6570\u7684\u51fd\u6570&#xff0c;\u79f0\u4e3a executor \u51fd\u6570\u3002executor \u51fd\u6570\u63a5\u6536\u4e24\u4e2a\u53c2\u6570&#xff1a;resolve \u548c reject&#xff0c;\u5206\u522b\u8868\u793a\u5f02\u6b65\u64cd\u4f5c\u6210\u529f\u548c\u5931\u8d25\u65f6\u7684\u56de\u8c03\u51fd\u6570\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u4e00\u4e2a Promise \u6a21\u62df\u5f02\u6b65\u64cd\u4f5c<\/span><br \/>\n<span class=\"token keyword\">const<\/span> promise<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token builtin\">number<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\"><span class=\"token builtin\">Promise<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>resolve<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Function<\/span><span class=\"token punctuation\">,<\/span> reject<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Function<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/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> randomNumber<span class=\"token operator\">:<\/span> <span class=\"token builtin\">number<\/span> <span class=\"token operator\">&#061;<\/span> Math<span class=\"token punctuation\">.<\/span><span class=\"token function\">random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>randomNumber <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0.5<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span>randomNumber<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6210\u529f&#xff0c;\u628a\u7ed3\u679c\u4f20\u51fa\u53bb<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">reject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Random number is too small&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5931\u8d25&#xff0c;\u628a\u9519\u8bef\u4f20\u51fa\u53bb<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token punctuation\">}<\/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 punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u91cc&#xff0c;setTimeout \u6a21\u62df\u4e00\u4e2a 1 \u79d2\u540e\u5b8c\u6210\u7684\u5f02\u6b65\u64cd\u4f5c\u30021 \u79d2\u540e\u751f\u6210\u968f\u673a\u6570&#xff0c;\u5927\u4e8e 0.5 \u5c31 resolve&#xff08;\u6210\u529f&#xff09;&#xff0c;\u5426\u5219 reject&#xff08;\u5931\u8d25&#xff09;\u3002\u521b\u5efa\u540e Promise \u5904\u4e8e pending \u72b6\u6001&#xff0c;1 \u79d2\u540e\u72b6\u6001\u624d\u786e\u5b9a\u3002<\/p>\n<h4>then \/ catch \/ finally<\/h4>\n<p>Promise \u63d0\u4f9b\u4e86 then\u3001catch\u3001finally \u65b9\u6cd5\u6765\u6ce8\u518c\u56de\u8c03\u51fd\u6570&#xff0c;\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\u7684\u6210\u529f\u6216\u5931\u8d25\u7ed3\u679c\u3002\u5f53 Promise \u72b6\u6001\u6539\u53d8\u65f6&#xff0c;\u56de\u8c03\u51fd\u6570\u4f1a\u88ab\u52a0\u5165\u5fae\u4efb\u52a1\u961f\u5217\u7b49\u5f85\u6267\u884c&#xff0c;\u4f9d\u8d56\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u5728\u5b8f\u4efb\u52a1\u6267\u884c\u5b8c\u6210\u540e\u4f18\u5148\u6267\u884c\u5fae\u4efb\u52a1&#xff0c;\u4ece\u800c\u4fdd\u8bc1\u56de\u8c03\u51fd\u6570\u7684\u5f02\u6b65\u8c03\u5ea6\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> BusinessError <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;&#064;kit.BasicServicesKit&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ then \u63a5\u6536\u4e24\u4e2a\u53c2\u6570&#xff1a;\u6210\u529f\u56de\u8c03\u548c\u5931\u8d25\u56de\u8c03<\/span><br \/>\npromise<span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token operator\">:<\/span> <span class=\"token builtin\">number<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u6210\u529f&#xff0c;\u7ed3\u679c\u662f <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>result<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token operator\">:<\/span> BusinessError<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u5931\u8d25&#xff0c;code: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>error<span class=\"token punctuation\">.<\/span>code<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">, message: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>error<span class=\"token punctuation\">.<\/span>message<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u66f4\u5e38\u89c1\u7684\u5199\u6cd5&#xff1a;then \u5904\u7406\u6210\u529f&#xff0c;catch \u5904\u7406\u5931\u8d25<\/span><br \/>\npromise<span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token operator\">:<\/span> <span class=\"token builtin\">number<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u6210\u529f&#xff0c;\u7ed3\u679c\u662f <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>result<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<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">catch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>error<span class=\"token operator\">:<\/span> BusinessError<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u5931\u8d25&#xff0c;code: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>error<span class=\"token punctuation\">.<\/span>code<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">, message: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>error<span class=\"token punctuation\">.<\/span>message<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<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ finally \u4e0d\u7ba1\u6210\u529f\u5931\u8d25\u90fd\u6267\u884c<\/span><br \/>\npromise<span class=\"token punctuation\">.<\/span><span class=\"token function\">finally<\/span><span class=\"token punctuation\">(<\/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 builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u64cd\u4f5c\u7ed3\u675f&#xff0c;\u65e0\u8bba\u6210\u529f\u5931\u8d25&#039;<\/span><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><\/p>\n<p>then \u7684\u94fe\u5f0f\u8c03\u7528\u662f Promise \u7684\u6838\u5fc3\u80fd\u529b\u3002\u524d\u4e00\u4e2a then \u7684\u8fd4\u56de\u503c\u4f1a\u4f20\u7ed9\u540e\u4e00\u4e2a then&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u94fe\u5f0f\u8c03\u7528&#xff0c;\u6bcf\u4e00\u6b65\u7684\u8fd4\u56de\u4f20\u7ed9\u4e0b\u4e00\u6b65<\/span><br \/>\n<span class=\"token function\">fetchUserId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token operator\">:<\/span> <span class=\"token builtin\">number<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token function\">fetchUserDetail<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u7528 id \u67e5\u8be6\u60c5<\/span><br \/>\n  <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>detail<span class=\"token operator\">:<\/span> UserDetail<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token function\">fetchUserAvatar<\/span><span class=\"token punctuation\">(<\/span>detail<span class=\"token punctuation\">.<\/span>avatarId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u7528\u8be6\u60c5\u67e5\u5934\u50cf<\/span><br \/>\n  <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>avatar<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u5934\u50cf URL: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>avatar<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">.<\/span><span class=\"token function\">catch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>error<span class=\"token operator\">:<\/span> BusinessError<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4efb\u4f55\u4e00\u6b65\u5931\u8d25\u90fd\u4f1a\u5230\u8fd9\u91cc<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u94fe\u8def\u4e2d\u67d0\u6b65\u5931\u8d25: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>error<span class=\"token punctuation\">.<\/span>message<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  <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u94fe\u5f0f\u8c03\u7528\u7684\u597d\u5904\u662f\u628a\u591a\u6b65\u5f02\u6b65\u64cd\u4f5c\u5199\u6210\u7ebf\u6027\u7684&#xff0c;\u4e0d\u7528\u5c42\u5c42\u5d4c\u5957\u56de\u8c03&#xff08;\u56de\u8c03\u5730\u72f1&#xff09;\u3002\u6bcf\u4e00\u6b65\u7684\u8f93\u51fa\u662f\u4e0b\u4e00\u6b65\u7684\u8f93\u5165&#xff0c;\u8bfb\u8d77\u6765\u50cf\u540c\u6b65\u4ee3\u7801\u3002<\/p>\n<h4>\u672a\u5904\u7406\u7684 reject<\/h4>\n<p>\u5f53 Promise \u88ab reject \u4e14\u672a\u901a\u8fc7 catch \u65b9\u6cd5\u5904\u7406\u65f6&#xff0c;\u4f1a\u89e6\u53d1 globalUnhandledRejectionDetected \u4e8b\u4ef6\u3002\u53ef\u4ee5\u7528 errorManager.on(&#039;globalUnhandledRejectionDetected&#039;) \u63a5\u53e3\u76d1\u542c\u8fd9\u4e2a\u4e8b\u4ef6&#xff0c;\u5168\u5c40\u6355\u83b7\u672a\u5904\u7406\u7684 Promise reject\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> errorManager <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;&#064;kit.BasicServicesKit&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5168\u5c40\u76d1\u542c\u672a\u5904\u7406\u7684 Promise reject<\/span><br \/>\nerrorManager<span class=\"token punctuation\">.<\/span><span class=\"token function\">on<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;globalUnhandledRejectionDetected&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u6709 Promise reject \u6ca1\u88ab\u5904\u7406: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>e<span class=\"token punctuation\">.<\/span>reason<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<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8fd9\u4e2a\u76d1\u542c\u5728\u5e94\u7528\u91cc\u5efa\u8bae\u52a0\u4e0a\u3002Promise \u94fe\u91cc\u6f0f\u5199 catch \u662f\u5e38\u89c1 bug&#xff0c;\u6709\u4e86\u5168\u5c40\u76d1\u542c\u81f3\u5c11\u80fd\u5728\u65e5\u5fd7\u91cc\u770b\u5230&#xff0c;\u4e0d\u81f3\u4e8e\u9759\u9ed8\u5931\u8d25\u3002<\/p>\n<h3>async\/await&#xff1a;Promise \u7684\u8bed\u6cd5\u7cd6<\/h3>\n<p>async\/await \u662f\u7528\u4e8e\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\u7684 Promise \u8bed\u6cd5\u7cd6&#xff0c;\u4f7f\u7f16\u5199\u5f02\u6b65\u4ee3\u7801\u66f4\u52a0\u7b80\u5355\u548c\u6613\u8bfb\u3002\u4f7f\u7528 async \u5173\u952e\u5b57\u58f0\u660e\u5f02\u6b65\u51fd\u6570&#xff0c;\u5e76\u4f7f\u7528 await \u5173\u952e\u5b57\u7b49\u5f85 Promise \u7684\u89e3\u6790&#xff08;fulfilled \u6216 rejected&#xff09;&#xff0c;\u4ee5\u540c\u6b65\u65b9\u5f0f\u7f16\u5199\u5f02\u6b65\u64cd\u4f5c\u7684\u4ee3\u7801\u3002<\/p>\n<h4>\u57fa\u672c\u7528\u6cd5<\/h4>\n<p><span class=\"token comment\">\/\/ async \u51fd\u6570\u8fd4\u56de Promise<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">myAsyncFunction<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token builtin\">string<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ await \u7b49\u5f85 Promise \u89e3\u6790<\/span><br \/>\n  <span class=\"token keyword\">const<\/span> result<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\"><span class=\"token builtin\">Promise<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>resolve<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Function<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/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 function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Hello, world!&#039;<\/span><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 number\">3000<\/span><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><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;Hello, world!<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> result<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8c03\u7528 async \u51fd\u6570<\/span><br \/>\n<span class=\"token decorator\"><span class=\"token at operator\">&#064;<\/span><span class=\"token function\">Entry<\/span><\/span><br \/>\n<span class=\"token decorator\"><span class=\"token at operator\">&#064;<\/span><span class=\"token function\">Component<\/span><\/span><br \/>\nstruct MyPage <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token decorator\"><span class=\"token at operator\">&#064;<\/span><span class=\"token function\">State<\/span><\/span> message<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u7b49\u5f85\u4e2d&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">Column<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>message<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">onClick<\/span><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\">let<\/span> res<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">myAsyncFunction<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n          <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>message <span class=\"token operator\">&#061;<\/span> res<span class=\"token punctuation\">;<\/span><br \/>\n        <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<p>async \u51fd\u6570\u8fd4\u56de Promise \u5bf9\u8c61\u3002\u51fd\u6570\u5185\u90e8\u53ef\u5305\u542b\u96f6\u4e2a\u6216\u591a\u4e2a await \u5173\u952e\u5b57&#xff0c;await \u4f1a\u6682\u505c\u6267\u884c&#xff0c;\u76f4\u5230\u5173\u8054\u7684 Promise \u5b8c\u6210\u72b6\u6001\u8f6c\u6362&#xff08;fulfilled \u6216 rejected&#xff09;\u3002\u82e5\u51fd\u6570\u6267\u884c\u8fc7\u7a0b\u4e2d\u629b\u51fa\u5f02\u5e38&#xff0c;\u8be5\u5f02\u5e38\u5c06\u76f4\u63a5\u89e6\u53d1\u8fd4\u56de\u7684 Promise \u8fdb\u5165 rejected \u72b6\u6001\u3002<\/p>\n<h4>await \u53ea\u80fd\u5728 async \u51fd\u6570\u5185\u7528<\/h4>\n<p>await \u5173\u952e\u5b57\u53ea\u5728 async \u51fd\u6570\u5185\u6709\u6548\u3002\u8fd9\u662f\u786c\u9650\u5236&#xff0c;\u5728\u666e\u901a\u51fd\u6570\u91cc\u5199 await \u4f1a\u62a5\u8bed\u6cd5\u9519\u8bef\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u8fd9\u6837\u4f1a\u62a5\u9519<\/span><br \/>\n<span class=\"token comment\">\/\/ function normalFunc() {<\/span><br \/>\n<span class=\"token comment\">\/\/   let result &#061; await someAsyncOp();  \/\/ \u8bed\u6cd5\u9519\u8bef<\/span><br \/>\n<span class=\"token comment\">\/\/ }<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5fc5\u987b\u5728 async \u51fd\u6570\u91cc<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">asyncFunc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">someAsyncOp<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5408\u6cd5<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5b9e\u9645\u5199\u4ee3\u7801\u65f6&#xff0c;\u7ecf\u5e38\u9047\u5230&#034;\u6211\u60f3\u5728\u67d0\u4e2a\u56de\u8c03\u91cc await&#xff0c;\u4f46\u56de\u8c03\u4e0d\u662f async&#034;\u7684\u60c5\u51b5\u3002\u89e3\u51b3\u529e\u6cd5\u662f\u628a\u56de\u8c03\u6539\u6210 async&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6bd4\u5982\u6309\u94ae\u70b9\u51fb\u4e8b\u4ef6<\/span><br \/>\n<span class=\"token function\">Button<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u70b9\u51fb&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">.<\/span><span class=\"token function\">onClick<\/span><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>  <span class=\"token comment\">\/\/ \u56de\u8c03\u6539\u6210 async<\/span><br \/>\n    <span class=\"token keyword\">let<\/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    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/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><\/p>\n<h3>\u540c\u6b65\u4ee3\u7801 vs \u5f02\u6b65\u4ee3\u7801\u5bf9\u6bd4<\/h3>\n<p>\u770b\u540c\u4e00\u4e2a\u4efb\u52a1\u7528\u540c\u6b65\u548c\u5f02\u6b65\u4e24\u79cd\u5199\u6cd5\u7684\u533a\u522b\u3002\u5047\u8bbe\u6709\u4e09\u4e2a\u7f51\u7edc\u8bf7\u6c42\u8981\u987a\u5e8f\u6267\u884c&#xff1a;<\/p>\n<p>\u540c\u6b65\u5199\u6cd5&#xff08;\u4f2a\u4ee3\u7801&#xff0c;\u5b9e\u9645\u4e0d\u5b58\u5728\u540c\u6b65\u7f51\u7edc\u8bf7\u6c42&#xff09;&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u540c\u6b65\u5199\u6cd5&#xff1a;\u4e09\u6b65\u987a\u5e8f\u6267\u884c&#xff0c;\u6bcf\u6b65\u90fd\u7b49<\/span><br \/>\n<span class=\"token keyword\">let<\/span> data1 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">requestSync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step1&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7b49 1 \u79d2<\/span><br \/>\n<span class=\"token keyword\">let<\/span> data2 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">requestSync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step2&#039;<\/span><span class=\"token punctuation\">,<\/span> data1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7b49 1 \u79d2<\/span><br \/>\n<span class=\"token keyword\">let<\/span> data3 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">requestSync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step3&#039;<\/span><span class=\"token punctuation\">,<\/span> data2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7b49 1 \u79d2<\/span><br \/>\n<span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span>data3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u603b\u8017\u65f6 3 \u79d2&#xff0c;\u671f\u95f4\u4e3b\u7ebf\u7a0b\u5361\u6b7b<\/span><\/p>\n<p>Promise \u94fe\u5f0f\u5199\u6cd5&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ Promise \u94fe&#xff1a;\u4e09\u6b65\u987a\u5e8f&#xff0c;\u4f46\u6bcf\u6b65\u7b49\u5f85\u65f6\u4e3b\u7ebf\u7a0b\u80fd\u5e72\u522b\u7684<\/span><br \/>\n<span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step1&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>data1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step2&#039;<\/span><span class=\"token punctuation\">,<\/span> data1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>data2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step3&#039;<\/span><span class=\"token punctuation\">,<\/span> data2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n  <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>data3<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span>data3<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><br \/>\n<span class=\"token comment\">\/\/ \u603b\u8017\u65f6\u8fd8\u662f 3 \u79d2&#xff08;\u987a\u5e8f\u4f9d\u8d56&#xff09;&#xff0c;\u4f46\u671f\u95f4\u4e3b\u7ebf\u7a0b\u4e0d\u5361<\/span><\/p>\n<p>async\/await \u5199\u6cd5&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ async\/await&#xff1a;\u770b\u8d77\u6765\u50cf\u540c\u6b65&#xff0c;\u5b9e\u9645\u662f\u5f02\u6b65<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">fetchAllData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> data1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step1&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7b49&#xff0c;\u4f46\u4e3b\u7ebf\u7a0b\u80fd\u5e72\u522b\u7684<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> data2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step2&#039;<\/span><span class=\"token punctuation\">,<\/span> data1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> data3 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step3&#039;<\/span><span class=\"token punctuation\">,<\/span> data2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span>data3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u603b\u8017\u65f6 3 \u79d2&#xff0c;\u4e3b\u7ebf\u7a0b\u4e0d\u5361&#xff0c;\u4ee3\u7801\u8bfb\u8d77\u6765\u50cf\u540c\u6b65<\/span><\/p>\n<p>\u4e09\u79cd\u5199\u6cd5\u91cc&#xff0c;async\/await \u7684\u53ef\u8bfb\u6027\u6700\u597d\u2014\u2014\u4ee3\u7801\u7ed3\u6784\u8ddf\u540c\u6b65\u4e00\u6837&#xff0c;\u4f46\u6ca1\u6709\u963b\u585e\u4e3b\u7ebf\u7a0b\u3002\u8fd9\u5c31\u662f async\/await \u7684\u4ef7\u503c&#xff1a;\u5f02\u6b65\u7684\u6267\u884c&#xff0c;\u540c\u6b65\u7684\u5199\u6cd5\u3002<\/p>\n<h4>\u5e76\u884c\u6267\u884c\u591a\u4e2a\u5f02\u6b65\u64cd\u4f5c<\/h4>\n<p>\u4e0a\u9762\u662f\u987a\u5e8f\u6267\u884c\u3002\u5982\u679c\u4e09\u4e2a\u8bf7\u6c42\u4e92\u4e0d\u4f9d\u8d56&#xff0c;\u53ef\u4ee5\u5e76\u884c&#xff0c;\u7528 Promise.all&#xff1a;<\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">fetchParallel<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token comment\">\/\/ \u4e09\u4e2a\u8bf7\u6c42\u540c\u65f6\u53d1\u8d77&#xff0c;\u7b49\u6700\u6162\u7684\u90a3\u4e2a\u5b8c\u6210<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> <span class=\"token punctuation\">[<\/span>data1<span class=\"token punctuation\">,<\/span> data2<span class=\"token punctuation\">,<\/span> data3<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token builtin\">Promise<\/span><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\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step1&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step2&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token function\">request<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/step3&#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 builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span>data1<span class=\"token punctuation\">,<\/span> data2<span class=\"token punctuation\">,<\/span> data3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u603b\u8017\u65f6\u7ea6 1 \u79d2&#xff08;\u4e09\u4e2a\u5e76\u884c&#xff0c;\u53d6\u6700\u6162\u7684&#xff09;<\/span><\/p>\n<p>\u6ce8\u610f\u8fd9\u91cc\u7528\u4e86\u89e3\u6784\u8d4b\u503c\u7684\u5199\u6cd5\u793a\u610f&#xff0c;\u5b9e\u9645 ArkTS \u91cc\u8981\u5355\u72ec\u53d6\u6bcf\u4e2a\u7ed3\u679c\u3002\u5e76\u884c\u6267\u884c\u80fd\u663e\u8457\u7f29\u77ed\u603b\u8017\u65f6&#xff0c;\u524d\u63d0\u662f\u64cd\u4f5c\u4e4b\u95f4\u6ca1\u6709\u4f9d\u8d56\u3002<\/p>\n<h3>\u9519\u8bef\u5904\u7406<\/h3>\n<p>\u5f02\u6b65\u4ee3\u7801\u7684\u9519\u8bef\u5904\u7406\u7528 try\/catch&#xff0c;\u8ddf\u540c\u6b65\u4ee3\u7801\u4e00\u6837&#xff1a;<\/p>\n<p><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">myAsyncFunction<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/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> result<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\"><span class=\"token builtin\">Promise<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>resolve<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Function<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;Hello, world!&#039;<\/span><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><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span>result<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>e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">Get exception: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>e<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  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>await \u540e\u9762\u7684 Promise \u5982\u679c reject&#xff0c;\u4f1a\u629b\u51fa\u5f02\u5e38&#xff0c;\u88ab catch \u6355\u83b7\u3002\u8fd9\u6bd4 Promise \u94fe\u7684 catch \u5199\u6cd5\u66f4\u76f4\u89c2\u3002<\/p>\n<p>\u51e0\u79cd\u5e38\u89c1\u7684\u9519\u8bef\u5904\u7406\u6a21\u5f0f&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u5f0f1&#xff1a;\u6574\u4e2a async \u51fd\u6570\u5305\u4e00\u4e2a try\/catch<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">mode1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/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> data1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchStep1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> data2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchStep2<\/span><span class=\"token punctuation\">(<\/span>data1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> data3 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchStep3<\/span><span class=\"token punctuation\">(<\/span>data2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span>data3<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>e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4efb\u4f55\u4e00\u6b65\u5931\u8d25\u90fd\u5230\u8fd9\u91cc<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u67d0\u6b65\u5931\u8d25: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>e<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  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u5f0f2&#xff1a;\u6bcf\u6b65\u5355\u72ec catch&#xff0c;\u5931\u8d25\u7ed9\u9ed8\u8ba4\u503c\u7ee7\u7eed<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">mode2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> data1<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    data1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchStep1<\/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>e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    data1 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u9ed8\u8ba4\u503c&#039;<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5931\u8d25\u7528\u9ed8\u8ba4\u503c&#xff0c;\u7ee7\u7eed\u5f80\u4e0b\u8d70<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> data2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchStep2<\/span><span class=\"token punctuation\">(<\/span>data1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span>data2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u5f0f3&#xff1a;\u4e0d catch&#xff0c;\u8ba9\u9519\u8bef\u5192\u6ce1\u7ed9\u8c03\u7528\u65b9<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">mode3<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token builtin\">string<\/span><span class=\"token operator\">&gt;<\/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> <span class=\"token function\">fetchStep1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5931\u8d25\u5c31\u629b\u7ed9\u8c03\u7528\u65b9<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> data<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8c03\u7528\u65b9\u5904\u7406<\/span><br \/>\n<span class=\"token function\">mode3<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">catch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">mode3 \u5931\u8d25: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>e<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<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u9009\u54ea\u79cd\u770b\u573a\u666f&#xff1a;\u6574\u6761\u94fe\u8def\u4efb\u4e00\u6b65\u5931\u8d25\u5c31\u5168\u5931\u8d25\u7528\u6a21\u5f0f1&#xff1b;\u67d0\u6b65\u5931\u8d25\u4e0d\u5f71\u54cd\u540e\u7eed\u7528\u6a21\u5f0f2&#xff1b;\u88ab\u8c03\u51fd\u6570\u4e0d\u7ba1\u9519\u8bef\u8ba9\u8c03\u7528\u65b9\u51b3\u5b9a\u7528\u6a21\u5f0f3\u3002<\/p>\n<h3>\u4e3e\u4e2a\u6817\u5b50&#xff1a;\u5e26\u7f13\u5b58\u7684\u5f02\u6b65\u6570\u636e\u52a0\u8f7d<\/h3>\n<p>\u628a\u524d\u9762\u8bb2\u7684\u4e32\u8d77\u6765\u770b\u4e00\u4e2a\u5b8c\u6574\u6848\u4f8b\u3002\u573a\u666f&#xff1a;\u4ece\u7f13\u5b58\u8bfb\u6570\u636e&#xff0c;\u7f13\u5b58\u6ca1\u6709\u5c31\u8bf7\u6c42\u7f51\u7edc&#xff0c;\u8bf7\u6c42\u6210\u529f\u5199\u5165\u7f13\u5b58\u3002\u6d89\u53ca\u591a\u4e2a\u5f02\u6b65\u64cd\u4f5c\u548c\u9519\u8bef\u5904\u7406\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">{<\/span> BusinessError <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">from<\/span> <span class=\"token string\">&#039;&#064;kit.BasicServicesKit&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u62df\u7f13\u5b58\u8bfb\u5199<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Cache<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">private<\/span> store<span class=\"token operator\">:<\/span> Map<span class=\"token operator\">&lt;<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">string<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">async<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token builtin\">string<\/span> <span class=\"token operator\">|<\/span> <span class=\"token keyword\">null<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6a21\u62df\u5f02\u6b65\u8bfb\u7f13\u5b58<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\"><span class=\"token builtin\">Promise<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>resolve<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Function<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/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 function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>store<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">??<\/span> <span class=\"token keyword\">null<\/span><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 number\">50<\/span><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><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token keyword\">async<\/span> <span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">,<\/span> value<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\"><span class=\"token builtin\">Promise<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>resolve<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Function<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/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\">this<\/span><span class=\"token punctuation\">.<\/span>store<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">resolve<\/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> <span class=\"token number\">50<\/span><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><br \/>\n  <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u62df\u7f51\u7edc\u8bf7\u6c42<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">fetchFromNetwork<\/span><span class=\"token punctuation\">(<\/span>url<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token builtin\">string<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\"><span class=\"token builtin\">Promise<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>resolve<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Function<\/span><span class=\"token punctuation\">,<\/span> reject<span class=\"token operator\">:<\/span> <span class=\"token builtin\">Function<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#061;&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/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\">if<\/span> <span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">.<\/span><span class=\"token function\">includes<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;error&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">reject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u8bf7\u6c42\u5931\u8d25: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>url<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">&#096;<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u6570\u636e\u6765\u81ea <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>url<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      <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/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 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\">\/\/ \u5e26\u7f13\u5b58\u7684\u6570\u636e\u52a0\u8f7d<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">loadData<\/span><span class=\"token punctuation\">(<\/span>url<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">:<\/span> <span class=\"token builtin\">Promise<\/span><span class=\"token operator\">&lt;<\/span><span class=\"token builtin\">string<\/span><span class=\"token operator\">&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> cache <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cache<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u5148\u67e5\u7f13\u5b58<\/span><br \/>\n  <span class=\"token keyword\">let<\/span> cached <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cached <span class=\"token operator\">!&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u547d\u4e2d\u7f13\u5b58&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> cached<span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u7f13\u5b58\u6ca1\u6709&#xff0c;\u8bf7\u6c42\u7f51\u7edc<\/span><br \/>\n  <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u7f13\u5b58\u672a\u547d\u4e2d&#xff0c;\u8bf7\u6c42\u7f51\u7edc&#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\">:<\/span> <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">fetchFromNetwork<\/span><span class=\"token punctuation\">(<\/span>url<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>e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">let<\/span> error <span class=\"token operator\">&#061;<\/span> e <span class=\"token keyword\">as<\/span> BusinessError<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u7f51\u7edc\u8bf7\u6c42\u5931\u8d25: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>error<span class=\"token punctuation\">.<\/span>message<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    <span class=\"token keyword\">throw<\/span> error<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5f80\u4e0a\u629b&#xff0c;\u8ba9\u8c03\u7528\u65b9\u77e5\u9053<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token comment\">\/\/ \u5199\u5165\u7f13\u5b58&#xff08;\u5931\u8d25\u4e0d\u5f71\u54cd\u8fd4\u56de&#xff09;<\/span><br \/>\n  <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">await<\/span> cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">,<\/span> data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5df2\u5199\u5165\u7f13\u5b58&#039;<\/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>e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token builtin\">console<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">error<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">&#096;<\/span><span class=\"token string\">\u5199\u7f13\u5b58\u5931\u8d25: <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>e<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>  <span class=\"token comment\">\/\/ \u5403\u6389&#xff0c;\u4e0d\u5f71\u54cd\u4e3b\u6d41\u7a0b<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token keyword\">return<\/span> data<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528<\/span><br \/>\n<span class=\"token decorator\"><span class=\"token at operator\">&#064;<\/span><span class=\"token function\">Entry<\/span><\/span><br \/>\n<span class=\"token decorator\"><span class=\"token at operator\">&#064;<\/span><span class=\"token function\">Component<\/span><\/span><br \/>\nstruct DataPage <span class=\"token punctuation\">{<\/span><br \/>\n  <span class=\"token decorator\"><span class=\"token at operator\">&#064;<\/span><span class=\"token function\">State<\/span><\/span> content<span class=\"token operator\">:<\/span> <span class=\"token builtin\">string<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u52a0\u8f7d\u4e2d&#8230;&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n  <span class=\"token decorator\"><span class=\"token at operator\">&#064;<\/span><span class=\"token function\">State<\/span><\/span> loading<span class=\"token operator\">:<\/span> <span class=\"token builtin\">boolean<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>  <span class=\"token keyword\">async<\/span> <span class=\"token function\">loadDataToUI<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>loading <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/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> data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">loadData<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/api\/user\/profile&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>content <span class=\"token operator\">&#061;<\/span> data<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>content <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;\u52a0\u8f7d\u5931\u8d25&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>loading <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n  <span class=\"token punctuation\">}<\/span><\/p>\n<p>  <span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">Column<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n      <span class=\"token function\">Text<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>content<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">fontSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><br \/>\n      <span class=\"token function\">Button<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u5237\u65b0&#039;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">onClick<\/span><span class=\"token punctuation\">(<\/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\">this<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">loadDataToUI<\/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><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">enabled<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>loading<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<p>\u8fd9\u6bb5\u4ee3\u7801\u91cc\u7528\u5230\u4e86&#xff1a;Promise \u6784\u9020\u51fd\u6570\u3001async\/await\u3001try\/catch\/finally\u3001Promise \u7684\u94fe\u5f0f\u8bed\u4e49&#xff08;await \u7b49\u5f85&#xff09;\u3002\u9519\u8bef\u5904\u7406\u5206\u4e24\u5c42&#xff1a;\u7f51\u7edc\u8bf7\u6c42\u5931\u8d25\u5f80\u4e0a\u629b&#xff0c;\u5199\u7f13\u5b58\u5931\u8d25\u5403\u6389\u3002finally \u4fdd\u8bc1 loading \u72b6\u6001\u4e00\u5b9a\u590d\u4f4d\u3002<\/p>\n<h3>\u51e0\u6761\u5c0f\u7ecf\u9a8c<\/h3>\n<p>await \u522b\u5fd8\u4e86\u3002 async \u51fd\u6570\u91cc\u8c03\u53e6\u4e00\u4e2a async \u51fd\u6570&#xff0c;\u5fd8\u4e86 await \u4f1a\u62ff\u5230 Promise \u5bf9\u8c61\u800c\u4e0d\u662f\u7ed3\u679c&#xff0c;\u540e\u7eed\u7528\u7ed3\u679c\u5c31\u51fa\u9519\u3002\u8fd9\u79cd bug \u6bd4\u8f83\u9690\u853d&#xff0c;\u56e0\u4e3a\u4e0d\u62a5\u9519&#xff0c;\u53ea\u662f\u884c\u4e3a\u4e0d\u5bf9\u3002\u4ee3\u7801\u5ba1\u67e5\u65f6\u91cd\u70b9\u770b await \u6709\u6ca1\u6709\u6f0f\u3002<\/p>\n<p>Promise.all \u8981\u6ce8\u610f\u77ed\u8def\u3002 Promise.all \u91cc\u4efb\u4e00\u4e2a Promise reject&#xff0c;\u6574\u4e2a\u5c31 reject\u3002\u5982\u679c\u60f3\u6240\u6709\u90fd\u5b8c\u6210\u4e0d\u7ba1\u6210\u529f\u5931\u8d25&#xff0c;\u7528 Promise.allSettled\u3002\u60f3\u7b2c\u4e00\u4e2a\u5b8c\u6210\u5c31\u7528 Promise.race\u3002\u6839\u636e\u573a\u666f\u9009\u5bf9\u65b9\u6cd5\u3002<\/p>\n<p>\u522b\u5728\u5faa\u73af\u91cc\u4e32\u884c await\u3002 \u5982\u679c\u591a\u4e2a\u5f02\u6b65\u64cd\u4f5c\u4e92\u4e0d\u4f9d\u8d56&#xff0c;\u522b\u5199\u6210 for (let item of items) { await process(item); }&#xff0c;\u8fd9\u662f\u4e32\u884c\u6267\u884c&#xff0c;\u6162\u3002\u7528 Promise.all(items.map(item &#061;&gt; process(item))) \u5e76\u884c\u3002<\/p>\n<p>finally \u91cc\u522b\u629b\u5f02\u5e38\u3002 finally \u5757\u91cc\u629b\u5f02\u5e38\u4f1a\u8986\u76d6\u524d\u9762\u7684\u6210\u529f\u7ed3\u679c\u3002finally \u53ea\u505a\u6e05\u7406&#xff08;\u590d\u4f4d\u72b6\u6001\u3001\u5173\u95ed\u8d44\u6e90&#xff09;&#xff0c;\u522b\u505a\u53ef\u80fd\u5931\u8d25\u7684\u64cd\u4f5c\u3002<\/p>\n<p>\u56de\u8c03\u6539\u6210 async \u8981\u5c0f\u5fc3 this\u3002 \u628a\u666e\u901a\u56de\u8c03\u6539\u6210 async \u56de\u8c03\u65f6&#xff0c;\u6ce8\u610f this \u6307\u5411\u3002\u7bad\u5934\u51fd\u6570\u7684 this \u662f\u5916\u5c42\u4f5c\u7528\u57df\u7684&#xff0c;\u666e\u901a\u51fd\u6570\u7684 this \u662f\u8c03\u7528\u7684\u3002\u5728\u7ec4\u4ef6\u91cc\u7528\u7bad\u5934\u51fd\u6570\u80fd\u6b63\u786e\u62ff\u5230\u7ec4\u4ef6 this\u3002<\/p>\n<p>\u5fae\u4efb\u52a1\u4f18\u5148\u7ea7\u3002 Promise \u7684 then \u56de\u8c03\u8d70\u5fae\u4efb\u52a1\u961f\u5217&#xff0c;\u5728\u5b8f\u4efb\u52a1\u4e4b\u524d\u6267\u884c\u3002\u7406\u89e3\u8fd9\u4e2a\u5bf9\u6392\u67e5&#034;\u4e3a\u4ec0\u4e48\u6211\u7684\u56de\u8c03\u6bd4\u9884\u671f\u65e9\/\u665a\u6267\u884c&#034;\u6709\u5e2e\u52a9\u3002\u4e8b\u4ef6\u5faa\u73af\u91cc\u5fae\u4efb\u52a1\u4f1a\u6e05\u7a7a\u5b8c\u624d\u6267\u884c\u4e0b\u4e00\u4e2a\u5b8f\u4efb\u52a1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f02\u6b65\u5e76\u53d1Promise \u548c async\/await \u600e\u4e48\u7528<br 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