{"id":244,"date":"2022-04-07T04:54:28","date_gmt":"2022-04-07T04:54:28","guid":{"rendered":"http:\/\/114.132.224.28\/?p=244"},"modified":"2022-04-07T04:54:28","modified_gmt":"2022-04-07T04:54:28","slug":"%e4%b8%80%e6%ad%a5%e6%ad%a5%e5%ae%9e%e7%8e%b0aysnc-await","status":"publish","type":"post","link":"http:\/\/localhost\/2022\/04\/07\/%e4%b8%80%e6%ad%a5%e6%ad%a5%e5%ae%9e%e7%8e%b0aysnc-await\/","title":{"rendered":"\u4e00\u6b65\u6b65\u5b9e\u73b0aysnc await"},"content":{"rendered":"\n<p>async\/await\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898\uff1a<\/p>\n\n\n\n<p>async\/await\u53ef\u4ee5\u89e3\u51b3promise.then\u8bed\u6cd5\u94fe\u5f0f\u8c03\u7528\u7684\u7e41\u7410\u95ee\u9898\uff0c\u901a\u8fc7.next()\u4f20\u53c2\u5f62\u5f0f\uff0c\u628a\u8868\u8fbe\u5f0f\u7684\u503c\u91cd\u65b0\u6ce8\u5165\u5230\u51fd\u6570\u91cc\u9762\uff0c\u53ef\u4ee5\u50cf\u540c\u6b65\u8c03\u7528\u90a3\u6837\u62ff\u5230\u5f02\u6b65\u51fd\u6570\u7684\u7ed3\u679c\u503c\uff0c\u5728\u8c03\u7528generator\u51fd\u6570\u65f6\uff0c\u91cc\u9762\u7684\u51fd\u6570\u4e5f\u4e0d\u4f1a\u5168\u90e8\u6267\u884c\uff0c\u800c\u662f\u9700\u8981.next()\u4e00\u6b65\u4e00\u6b65\u8fd0\u884c\u5230yield\u7684\u8282\u70b9\uff0c\u8fd9\u6837\u5728yield\u8868\u8fbe\u5f0f\u4e0b\u7684\u51fd\u6570\uff0c\u5c31\u9700\u8981\u7b49\u5230\u5916\u90e8\u51fd\u6570\u8c03\u7528.next()\u4e4b\u540e\u8c03\u7528\uff0c\u8fd9\u6837\u7533\u660e\u548c\u8c03\u7528\u51fd\u6570\u7684\u903b\u8f91\u5c31\u53ef\u4ee5\u5199\u5728\u4e00\u8d77\u3002\u8fd9\u4e2a\u662f\u901a\u8fc7Iterator\u65e0\u6cd5\u5b9e\u73b0\u7684\uff08\u4e0b\u6587\u4f1a\u8be6\u7ec6\u89e3\u91ca\uff09<\/p>\n\n\n\n<p>P.S.: \u4efb\u4f55\u6709\u7591\u95ee\u7684\u5730\u65b9\u90fd\u53ef\u4ee5\u901a\u8fc7debugger\u6765\u6253\u65ad\u70b9\u53bb\u7406\u89e3\u3002\u901a\u8fc7npm run debug<\/p>\n\n\n\n<p>\u524d\u7f6e\u77e5\u8bc6\uff1a<\/p>\n\n\n\n<p>async\/await\u662fgenerator\/yield\u7684\u8bed\u6cd5\u7cd6<\/p>\n\n\n\n<p>generator\/yield[\u6269\u5c55\u9605\u8bfb\uff1a<a href=\"https:\/\/es6.ruanyifeng.com\/#docs\/generator\" target=\"_blank\" rel=\"noreferrer noopener\">generator\/yield\u662f\u4ec0\u4e48?<\/a>]<\/p>\n\n\n\n<ul><li>\u8bed\u6cd5\uff1a<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u58f0\u660e\u4e00\u4e2aGenerator\u51fd\u6570\nfunction* gen () {  \n  const result = yield \u8868\u8fbe\u5f0f\n}\n\/\/  \u8c03\u7528\nconst g = gen()\ng.next(param)\ng.throw(param)\ng.return(param)<\/code><\/pre>\n\n\n\n<p>next\/throw\/return\u80fd\u8ba9\u6211\u4eec\u4ece\u5916\u9762\u5411generator\u4f20\u503c<\/p>\n\n\n\n<p>next \u6267\u884cyield\u7684\u8868\u8fbe\u5f0f\uff0c\u5e76\u5f97\u5230{done ,value}\u5bf9\u8c61\uff0c\u4f7f\u5916\u5c42\u51fd\u6570\u77e5\u9053generator\u662f\u5426\u5df2\u7ecf\u6267\u884c\u5b8c\uff0cyield\u7684\u8868\u8fbe\u5f0f\u6c42\u503c\u540e\u7684\u7ed3\u679c\u662f\u4ec0\u4e48\uff0cnext\u4f20\u9012\u7684\u53c2\u6570\uff0c\u8d4b\u503c\u7ed9result<\/p>\n\n\n\n<p>throw\u53ef\u4ee5\u8ba9generator\u629b\u51fa\u5f02\u5e38\uff0c\u7ec8\u6b62generator\uff0c\u4f20\u9012\u9519\u8bef\u53c2\u6570\uff0c\u4f1a\u88ab\u5185\u90e8\u7684catch\u6355\u83b7\u4f7f\u7528<\/p>\n\n\n\n<p>return\u53ef\u4ee5\u8ba9generator\u7ec8\u6b62\uff0cvalue\u503c\u4e3areturn\u4f20\u7684\u53c2\u6570<\/p>\n\n\n\n<p>generator\/yield\u63d0\u4f9b\u4e86\u4e00\u79cd\u5916\u90e8\u51fd\u6570\u548c\u5185\u90e8\u51fd\u6570\u4f20\u9012\u6570\u636e\u7684\u65b9\u5f0f\uff0c\u5b9e\u73b0\u903b\u8f91\u5206\u79bb\uff0c\u90a3\u4e48\u4e00\u6b65\u6b65\u8c03\u7528next\u51fd\u6570\u6bd4\u8f83\u9ebb\u70e6\u7684\uff0c\u6709\u6ca1\u6709\u4e00\u79cd\u81ea\u52a8\u6267\u884c\u7684\u65b9\u6cd5\uff0c\u81ea\u52a8\u6267\u884c\u5c31\u662f\u901a\u8fc7\u9012\u5f52\u5e76\u4f20\u9012\u53c2\u6570\u7684\u5f62\u5f0f\u5b9e\u73b0\u7684<\/p>\n\n\n\n<p>\u90a3\u4e48\u6211\u4eec\u5148\u5b9e\u73b0\u4e00\u4e2a\u540c\u6b65\u7248\u672c\u7684\u81ea\u52a8\u6267\u884c\u5668<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L3\" data-type=\"URL\" data-id=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L3\" target=\"_blank\" rel=\"noreferrer noopener\">\u4ee3\u7801\u5730\u5740<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/  \u5b9e\u73b0async,await\n\/\/  \u5148\u8003\u8651generation yield\u7684\u540c\u6b65\u7248\u672c\nfunction* g() {\n    const a = yield syncFn('hi')\n    console.log('a', a)\n    const b = yield syncErrorFn(a + 'sync')\n    console.log('a', b)\n    return b\n}\n\nfunction syncFn(a) {\n    return a \n}\n\nfunction syncErrorFn(a) {\n    throw(new Error(a))\n}\n\nfunction syncStep(gen) {\n    const g = gen()\n    function autoRun(property, preVal) {\n        let next;\n        next = g&#91;property](preVal)\n        \n        if(next.done) {\n            return next.value\n        }else{\n            return autoRun('next', next.value)\n        }\n    }\n    try {\n        return autoRun('next', undefined)\n    } catch (error) {\n        console.log('outer', error.message)\n    }\n    \n}\n\nsyncStep(g)<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u662f\u540c\u6b65\u8c03\u7528\uff0c\u6211\u4eec\u4e0d\u9700\u8981\u62c5\u5fc3\u629b\u9519\u80fd\u4e0d\u80fd\u88ab\u5192\u6ce1\u6355\u83b7\uff0cyield\u8868\u8fbe\u5f0f\u5982\u679c\u629b\u9519\uff0cgenerator\u51fd\u6570\u5c31\u4f1a\u7ec8\u6b62\u8fed\u4ee3\uff0c\u7406\u89e3\u4e86\u540c\u6b65\u8c03\u7528\uff0c\u90a3\u4e48\u5f02\u6b65\u8c03\u7528\u53ea\u9700\u8981\u89e3\u51b3\u597dpromise.then\u7684\u95ee\u9898\uff0c\u628aresolve\u7684value\u8fd4\u56de\u5230generator\u51fd\u6570\uff0c\u6216\u8005reject\u7684error\u5e26\u5230\u51fd\u6570\u7ec8\u6b62\u8fed\u4ee3\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L40\" target=\"_blank\" rel=\"noreferrer noopener\">\u4ee3\u7801\u5730\u5740<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/  \u5b9e\u73b0\u5f02\u6b65\u7248\u672c\nfunction* asyncG() {\n    const a = yield asyncFn('hi')\n    console.log('a', a)\n    const b = yield asyncErrorFn(a + 'async')\n    debugger\n    console.log('b', b)\n    return b    \n}\n\nfunction asyncFn(a) {\n    return new Promise((resolve, reject) =&gt; {\n        setTimeout(() =&gt; {\n            resolve(a)\n        },1000)\n    })\n}\n\nfunction asyncErrorFn(a) {\n    return new Promise((resolve, reject) =&gt; {\n        setTimeout(() =&gt; {\n            reject(a)\n        },500)\n    })\n}\n\nfunction step(gen) {\n    const g = gen()\n    return new Promise((resolve, reject) =&gt; {\n        function autoRun(property, preVal) {\n            let next;\n            try {\n                next = g&#91;property](preVal)\n                debugger\n            } catch (error) {\n                return reject(error)    \/\/  \u8fd9\u91ccreject\u7684\u540c\u65f6\u9700\u8981\u7ec8\u6b62\u9012\u5f52\n            }\n            if(next.done) {\n                return resolve(next.value)\n            }\n            next.value.then((resolve) =&gt; {\n                autoRun(\"next\", resolve)\n            }).catch((error) =&gt; {\n                autoRun(\"throw\", error)\n            })\n        }\n        autoRun('next', undefined)\n    })\n}\n\nstep(asyncG).then((resolve) =&gt; {\n    console.log('step', resolve)\n}).catch((error) =&gt; {\n    console.log('stepError', error)\n})<\/code><\/pre>\n\n\n\n<p>\u90a3\u6211\u4eec\u518d\u770b\u770b\u7ec6\u770b\u5904\u7406\u9519\u8bef\u7684\u95ee\u9898\uff0c\u6211\u4eec\u6709\u65f6\u4f1a\u9047\u5230<em>UnhandledPromiseRejectionWarning<\/em>\uff0c\u8fd9\u662f\u54ea\u91cc\u51fa\u95ee\u9898\u4e86\u5462\uff1f<\/p>\n\n\n\n<p>\u6211\u4eec\u4e0d\u518d.catch\u6355\u83b7async\u8fd4\u56de\u7684promise\u5f02\u5e38\u6539\u6210try\/catch\u5f62\u5f0f<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L93\" target=\"_blank\" rel=\"noreferrer noopener\">\u4ee3\u7801\u5730\u5740<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>async function canNotCatchFn() {\n  try {\n    \/\/  UnhandledPromiseRejectionWarning\n    step(asyncG) \/\/  \u8fd9\u91cc\u4f1a\u6355\u83b7\u4e0d\u4e86\u9519\u8bef\uff0c\u8981\u4e0d\u5c31\u662f\u518d\u5305async,await,\u8981\u4e0d\u5c31.catch\u53bb\u6355\u83b7\n    \/\/  await  step(asyncG)\n  } catch (error) {\n    console.log(error)\n  }\n}\n\ncanNotCatchFn()<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u7531\u4e8easync\u5185\u90e8\u6709\u9519\u8bef\uff0c\u800c\u5185\u90e8\u4e5f\u6ca1\u6709try\/catch\u53bb\u6355\u83b7\uff0c\u90a3\u4e48\u8fd9\u4e2a\u9519\u8bef\u5c31\u4f1a\u88abautoRun\u6267\u884c\u7684\u65f6\u5019\u6355\u83b7\u5230\uff0c\u7136\u540e\u5c06\u8fd4\u56de\u7684promise\u7684\u72b6\u6001\u8bbe\u4e3areject\uff0c\u800c\u5916\u90e8\u8c03\u7528\u7684\u65f6\u5019\u6ca1\u6709\u5904\u7406\u8fd9\u4e2areject\u5c31\u4f1a\u5bfc\u81f4<em>UnhandledPromiseRejectionWarning<\/em>\uff0c\u77e5\u9053\u4ec0\u4e48\u539f\u56e0\u4e4b\u540e\uff0c\u8981\u89e3\u51b3\u5c31\u5f88\u7b80\u5355\u8981\u4e0d\u518d\u5305async,await,\u8981\u4e0d\u5c31.catch\u53bb\u6355\u83b7\u3002\u5982\u679c\u5728\u5185\u90e8\u6709try\/catch\u53bb\u6355\u83b7\uff0c\u5c31\u4e0d\u4f1a\u8d70\u5230autoRun\u7684catch\uff0c\u800c\u662f\u7ee7\u7eed\u6267\u884c\u5230\u4e0b\u4e00\u4e2ayield\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u8fd9\u91cc\u603b\u7ed3\u4e00\u4e0b\u9519\u8bef\u5904\u7406\uff1a<\/p>\n\n\n\n<ul><li>\u5199\u5728async\/await\u5185\u90e8\uff0ctry\/catch\u65f6\u9700\u8981\u6ce8\u610f\uff0c\u8fd4\u56de\u7684\u503c\u53ef\u80fd\u662fundefined\uff0c\u56e0\u4e3areject\u7684\u65f6\u5019\u662f\u62ff\u4e0d\u5230\u503c\u7684,\u800ctry\/catch\u4e4b\u540e\u7684yield\u80fd\u6b63\u5e38\u8c03\u7528\u3010\u9002\u7528\u5982\u679c\u5176\u4e2d\u6709\u4e00\u6b65\u5f02\u6b65\u51fa\u9519\uff0c\u4f46\u4e0b\u4e00\u6b65\u5f02\u6b65\u64cd\u4f5c\u4ecd\u6b63\u5e38\u6267\u884c\u3011<\/li><li>\u5199\u5728\u8c03\u7528async\u7684\u65f6\u5019\uff0c\u8fd9\u65f6\u5019\u51fd\u6570\u53ea\u4f1a\u8d70\u5230\u629b\u51fa\u5f02\u5e38\u4ee5\u524d\u7684await\uff0c\u5f97\u5230\u7684catch\u4e5f\u662f\u51fa\u5f02\u5e38\u7684\u5f02\u6b65\u51fd\u6570\u65f6\u629b\u51fa\u7684reject\u3010\u9002\u7528\u5982\u679c\u5176\u4e2d\u6709\u4e00\u4e2a\u5f02\u6b65\u51fa\u9519\u4e86\uff0c\u5c31\u4e0d\u884c\u7ee7\u7eed\u5176\u4ed6\u5f02\u6b65\u3011<\/li><li>\u53ef\u4ee5\u4e0d\u8fc7\u65e9\u7684\u6355\u83b7\u9519\u8bef\uff0c\u5199service\u5c42\u8c03\u7528\u670d\u52a1\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u5c06\u6355\u83b7\u9519\u8bef\u7559\u5230\u8c03\u7528\u8fd9\u4e2a\u670d\u52a1\u624d\u5199<\/li><li>\u5982\u679c\u8981\u7528async\/await\u5185\u90e8\u6355\u83b7\u5c31\u8981try\/catch\uff0c\u76f4\u63a5\u8c03\u7528async\u5c31\u8981\u7528.catch\u6355\u83b7\uff0casync\u51fd\u6570\u5982\u679c\u6ca1\u5199try\/catch\u60f3\u6355\u83b7\u540c\u6b65\u9519\u8bef\uff0c\u9700\u8981\u5728\u5916\u90e8\u8c03\u7528\u7684\u65f6\u5019\u7528.catch<\/li><\/ul>\n\n\n\n<p><a href=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L127\" data-type=\"URL\" data-id=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L127\" target=\"_blank\" rel=\"noreferrer noopener\">\u4ee3\u7801\u5730\u5740<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/  \u6a21\u62dfservice\u60c5\u51b5\nconst getEntityCatch = async() =&gt; {\n  try {\n    const data = await getFailEntity()\n    return data\n  } catch (error) {\n    console.log('getEntityError', error)\n  }\n}\nconst getFailEntity = async() =&gt; {\n  const data = await mockFetchData(false)\n  return data\n}\nconst getSuccessEntity = async() =&gt; {\n  const data = await mockFetchData(true)\n  return data\n}\n\nconst mockFetchData = (success) =&gt; {\n  return new Promise((resolve, reject) =&gt; {\n    if(success) {\n      resolve(&#91;1,2,3])\n    }else{\n      reject(new Error('fail'))\n    }\n  })\n}\n\n\/\/  \u4e0d\u76f8\u5173\u7684\u6b65\u9aa4\u60f3\u987a\u5e8f\u6267\u884c\nconst uiNotRelativeFn = async() =&gt; {\n  const data1 = await getEntityCatch()\n  console.log('uiNotRelativeFn', data1)\n  const data2 = await getSuccessEntity()  \/\/  \u6ce8\u610f\u8fd9\u91cc\u629b\u51fa\u7684\u9519\u8bef\u6ca1\u6709\u88ab\u6355\u83b7\n  console.log('uiNotRelativeFn', data2)\n}\n\nuiNotRelativeFn()  \/\/ \u5982\u679cdata2\u629b\u51fa\u9519\u8bef\uff0c\u5219\u4f1a\u6355\u83b7\u4e0d\u5230data2\u7684\u9519\u8bef\n\n\/\/  \u76f8\u5173\u7684\u6b65\u9aa4\u60f3\u987a\u5e8f\u6267\u884c\nconst uiRelativeFn = async() =&gt; {\n  try {\n    const data1 = await getFailEntity()\n    console.log('uiRelativeFn', data1)\n    const data2 = await getSuccessEntity()\n    console.log('uiRelativeFn', data2)\n  } catch (error) {\n    console.log('uiRelativeFnError', error)\n  }\n}\n\nuiRelativeFn()\n\n\/\/  \u76f8\u5173\u7684\u6b65\u9aa4\u60f3\u987a\u5e8f\u6267\u884c\nconst uiRelativeNotCatchFn = async() =&gt; {\n    const data1 = await getFailEntity()\n    console.log('uiRelativeNotCatchFn', data1)\n    const data2 = await getSuccessEntity()\n    console.log('uiRelativeNotCatchFn', data2)\n}\n\nconst uiRelativeNotCatchNormalErrorFn = async() =&gt; {\n    const data2 = await getSuccessEntity()\n    console.log('uiRelativeNotCatchFn', data2)\n    throw(new Error(\"sync Error\"))\n    const data1 = await getFailEntity()\n    console.log('uiRelativeNotCatchFn', data1)\n}\n\nuiRelativeNotCatchNormalErrorFn().catch(error =&gt; {\n  console.log('uiRelativeNotCatchNormalErrorFn', error)\n})<\/code><\/pre>\n\n\n\n<p>\u4e0b\u9762\u6765\u63a2\u8ba8\u4e00\u4e0b\u5982\u679c\u4e0d\u7528generator\uff0c\u5355\u7eaf\u901a\u8fc7Iterator\u65b9\u5f0f\u8981\u600e\u4e48\u5b9e\u73b0<\/p>\n\n\n\n<p>\u6211\u4eec\u77e5\u9053generator\u8fd4\u56de\u7684\u5c31\u662f\u4e00\u4e2a\u8fed\u4ee3\u5bf9\u8c61\uff0c\u90a3\u6211\u4eec\u5982\u679c\u4e0d\u7528generator\uff0c\u80fd\u4e0d\u80fd\u4e5f\u5b9e\u73b0\u540c\u6837\u7684\u6548\u679c<\/p>\n\n\n\n<p>\u6211\u4eec\u6765\u5148\u770b\u4e00\u822c\u6211\u4eec\u662f\u600e\u4e48\u5b9e\u73b0promise\u7684\u987a\u5e8f\u6267\u884c\u7684<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L201\" target=\"_blank\" rel=\"noreferrer noopener\">\u4ee3\u7801\u5730\u5740<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ promise\u7248\u672c\nfunction promiseFn() {\n    return asyncFn(\"hi\")\n    .then((resolve) =&gt; asyncFn(resolve + \"async\"))\n    .then((resolve) =&gt; asyncErrorFn(resolve))\n}\n\npromiseFn().then((resolve) =&gt; {\n    console.log('promiseFn', resolve)\n}).catch((error) =&gt; {\n    console.log('promiseFnError', error)\n})\n<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u6211\u4eec\u60f3\u514d\u53bbpromise.then\u8bed\u6cd5\u8ba9\u4ed6\u987a\u5e8f\u6267\u884c\uff0c\u90a3\u4e48\u8fd9\u4e9b\u5907\u8c03\u7528\u7684\u51fd\u6570\u9700\u8981\u5b58\u5728generator\u51fd\u6570\u91cc\u9762\u3002\u6211\u4eec\u7528\u6570\u7ec4\u6765\u5b58\u50a8\u4ed6\u4eec<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L213\" data-type=\"URL\" data-id=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L213\" target=\"_blank\" rel=\"noreferrer noopener\">\u4ee3\u7801\u5730\u5740<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u81ea\u52a8\u6267\u884cpromise\u7248\u672c\nfunction autoRunPromiseFn(arr) {\n    return new Promise((resolve, reject) =&gt; {\n        function autoRun(value) {\n            const promiseFn = arr.shift()\n            debugger\n            if(!promiseFn)return resolve(value)\n            promiseFn(value).then((resolve) =&gt; {\n                autoRun(resolve)\n            }).catch((error) =&gt; {\n                reject(error)\n            })\n        }\n        autoRun(undefined)\n    })\n}\n\nautoRunPromiseFn(&#91;() =&gt; asyncFn(\"hi\"), (resolve) =&gt; asyncFn(resolve + \"async\"), (resolve) =&gt; asyncErrorFn(resolve)]).then((resolve) =&gt; {\n    console.log('autoRunPromiseFn', resolve)\n}).catch((error) =&gt; {\n    console.log('autoRunPromiseError', error)\n})<\/code><\/pre>\n\n\n\n<p>\u663e\u7136\u8fd9\u6837\u7528\u6570\u7ec4\uff0c\u5e76\u6ca1\u6709\u6bd4\u4e00\u822cpromise\u597d\u591a\u5c11\uff0c\u53ea\u662f\u628apromise.then\u8fd9\u4e2a\u53bb\u6389\u4e86\uff0c\u770b\u8d77\u6765\u8fd8\u662f\u6bd4\u8f83\u590d\u6742\uff0c\u90a3\u4e48\u6211\u4eec\u7528\u4e00\u4e2agenerator\u51fd\u6570\u5305\u542b\u4ed6\u4eec<\/p>\n\n\n\n<p><a href=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L236\" data-type=\"URL\" data-id=\"https:\/\/github.com\/cyanxxx\/blogcode\/blob\/94535a046eb65aab607557a3bb262bd73e8c6b89\/how_to_realize_aysnc_await\/async.js#L236\" target=\"_blank\" rel=\"noreferrer noopener\">\u4ee3\u7801\u5730\u5740<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/  Iterator promise\u7248\u672c\nconst promiseNextFn = () =&gt; {\n    let promiseFnArr = &#91;]\n    let error = false\n    return {\n        next(...args){\n            const promiseFn = promiseFnArr.shift()\n            if(!promiseFn || error){\n                return {\n                    value: args,\n                    done: true\n                }\n            }\n            return {\n                done: false,\n                value: promiseFn(...args)\n            }\n        },\n        setCurrentFn(fn){\n            promiseFnArr.push(fn)\n        },\n        throw(value){\n            error = true\n            throw(new Error(value))\n         }\n    }\n}\nfunction promiseRunFn() {\n    const g = promiseNextFn()\n    g.setCurrentFn(() =&gt; {\n        return asyncFn(\"hi\")\n    })\n    g.setCurrentFn((resolve) =&gt; {\n        return asyncFn(resolve + \"async\")\n    })\n    g.setCurrentFn((resolve) =&gt; {\n        return asyncErrorFn(resolve)\n    })\n    return g\n}\n\nstep(promiseRunFn).then((resolve) =&gt; {\n    console.log('promiseFn', resolve)\n}).catch((error) =&gt; {\n    console.log('promiseFnError', error.message)\n})\n\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u6211\u4eec\u76f4\u63a5\u590d\u7528\u4e4b\u524d\u5b9e\u73b0\u7684async\/await\u7684step,\u4f46\u662f\u6ca1\u6709\u4e86generator\/yield\uff0c\u6211\u4eec\u5c31\u8981\u628a\u58f0\u660e\u5f02\u6b65\u51fd\u6570\u548c\u8c03\u7528\u5f02\u6b65\u51fd\u6570\u7684\u903b\u8f91\u5206\u5f00\uff0c\u6700\u540e\u53ea\u80fd\u8ddfpromise.then\u4e00\u6837\uff0c\u4f46\u901a\u8fc7\u8fd9\u4e2aIterator\u7248\u672c\u4f60\u4f1a\u5bf9generator\u6709\u66f4\u6df1\u7684\u4e86\u89e3\uff0c\u6bd4\u5982\u4e3a\u4ec0\u4e48\u8981\u5148\u6267\u884c\u4e00\u6b21generator\u51fd\u6570\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5bf9\u8c61\uff0c\u4e3a\u4ec0\u4e48\u629b\u9519\u53ef\u4ee5\u5728generator\u5185\u90e8\u548c\u5916\u90e8\u90fd\u80fd\u83b7\u53d6\u5230<\/p>\n\n\n\n<p>reference:<\/p>\n\n\n\n<ul><li><a 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