{"id":257,"date":"2018-05-16T20:37:56","date_gmt":"2018-05-16T12:37:56","guid":{"rendered":"https:\/\/wyxxt.org.cn\/?p=257"},"modified":"2023-12-04T17:10:08","modified_gmt":"2023-12-04T09:10:08","slug":"async-await-promise","status":"publish","type":"post","link":"https:\/\/wyxxt.org.cn\/?p=257","title":{"rendered":"async await Promise"},"content":{"rendered":"

async\/await\u4f5c\u4e3a\u4e00\u79cd\u4f18\u96c5\u7b80\u5355\u7684\u5f02\u6b65\u65b9\u6848\uff0c\u63a8\u8350\u6709\u6761\u4ef6\u5c3d\u91cf\u4f7f\u7528\u3002<\/strong><\/p>\n

\u4e00\u4e2a\u4f8b\u5b50<\/strong><\/p>\n

\u5b9e\u73b0\u4e00\u4e2a\u6682\u505c\u529f\u80fd<\/em><\/strong><\/p>\n

 var sleep = function (time) {\n    return new Promise(function (resolve, reject) {\n        setTimeout(function () {\n            resolve();\n        }, time);\n    })\n};\n\nvar start = async function () {\n    \/\/ \u5728\u8fd9\u91cc\u4f7f\u7528\u8d77\u6765\u5c31\u50cf\u540c\u6b65\u4ee3\u7801\u90a3\u6837\u76f4\u89c2\n    console.log('start');\n    await sleep(3000);\n    console.log('end');\n};\n\nstart();\n<\/code><\/pre>\n
\u63a7\u5236\u53f0\u5148\u8f93\u51fastart\uff0c\u7b49\u5f853\u79d2\u540e\uff0c\u8f93\u51faend\u3002<\/p>\n
\u57fa\u672c\u89c4\u5219<\/strong><\/p>\n
async \u8868\u793a\u8fd9\u662f\u4e00\u4e2aasync\u51fd\u6570\uff0cawait\u53ea\u80fd\u7528\u5728\u8fd9\u4e2a\u51fd\u6570\u91cc\u9762\u3002
\nawait \u8868\u793a\u5728\u8fd9\u91cc\u7b49\u5f85promise\u8fd4\u56de\u7ed3\u679c\u4e86\uff0c\u518d\u7ee7\u7eed\u6267\u884c\u3002
\nawait \u540e\u9762\u8ddf\u7740\u7684\u5e94\u8be5\u662f\u4e00\u4e2apromise\u5bf9\u8c61\uff08\u5f53\u7136\uff0c\u5176\u4ed6\u8fd4\u56de\u503c\u4e5f\u6ca1\u5173\u7cfb\uff0c\u53ea\u662f\u4f1a\u7acb\u5373\u6267\u884c\uff0c\u4e0d\u8fc7\u90a3\u6837\u5c31\u6ca1\u6709\u610f\u4e49\u4e86\u2026\uff09
\n\u83b7\u5f97\u8fd4\u56de\u503c<\/em><\/strong><\/p>\n
await\u7b49\u5f85\u7684\u867d\u7136\u662fpromise\u5bf9\u8c61\uff0c\u4f46\u4e0d\u5fc5\u5199.then(..)\uff0c\u76f4\u63a5\u53ef\u4ee5\u5f97\u5230\u8fd4\u56de\u503c\u3002<\/p>\n
 var sleep = function (time) {\n    return new Promise(function (resolve, reject) {\n        setTimeout(function () {\n            \/\/ \u8fd4\u56de \u2018ok\u2019\n            resolve('ok');\n        }, time);\n    })\n};\n\nvar start = async function () {\n    let result = await sleep(3000);\n    console.log(result); \/\/ \u6536\u5230 \u2018ok\u2019\n};\n\nstart();\n<\/code><\/pre>\n
\u6355\u6349\u9519\u8bef<\/em><\/strong><\/p>\n
\u65e2\u7136.then(..)\u4e0d\u7528\u5199\u4e86\uff0c\u90a3\u4e48.catch(..)\u4e5f\u4e0d\u7528\u5199\uff0c\u53ef\u4ee5\u76f4\u63a5\u7528\u6807\u51c6\u7684try catch\u8bed\u6cd5\u6355\u6349\u9519\u8bef\u3002<\/p>\n
 var sleep = function (time) {\n    return new Promise(function (resolve, reject) {\n        setTimeout(function () {\n            \/\/ \u6a21\u62df\u51fa\u9519\u4e86\uff0c\u8fd4\u56de \u2018error\u2019\n            reject('error');\n        }, time);\n    })\n};\n\nvar start = async function () {\n    try {\n        console.log('start');\n        await sleep(3000); \/\/ \u8fd9\u91cc\u5f97\u5230\u4e86\u4e00\u4e2a\u8fd4\u56de\u9519\u8bef\n\n        \/\/ \u6240\u4ee5\u4ee5\u4e0b\u4ee3\u7801\u4e0d\u4f1a\u88ab\u6267\u884c\u4e86\n        console.log('end');\n    } catch (err) {\n        console.log(err); \/\/ \u8fd9\u91cc\u6355\u6349\u5230\u9519\u8bef `error`\n    }\n};\n\nstart();\n<\/code><\/pre>\n
\u5faa\u73af\u591a\u4e2aawait<\/em><\/strong>
\nawait\u770b\u8d77\u6765\u5c31\u50cf\u662f\u540c\u6b65\u4ee3\u7801\uff0c\u6240\u4ee5\u53ef\u4ee5\u7406\u6240\u5f53\u7136\u7684\u5199\u5728for\u5faa\u73af\u91cc\uff0c\u4e0d\u5fc5\u62c5\u5fc3\u4ee5\u5f80\u9700\u8981\u95ed\u5305\u624d\u80fd\u89e3\u51b3 \u7684\u95ee\u9898\u3002<\/p>\n
 var sleep = function (time) {\n    return new Promise(function (resolve, reject) {\n        setTimeout(function () {\n            resolve();\n        }, time);\n    })\n}\n\nvar start = async function () {\n    for (var i = 1; i <= 10; i++) {\n        console.log(`\u5f53\u524d\u662f\u7b2c${i}\u6b21\u7b49\u5f85..`);\n        await sleep(1000);\n    }\n}\n\nstart();\n<\/code><\/pre>\n
\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cawait\u5fc5\u987b\u5728async\u51fd\u6570\u7684\u4e0a\u4e0b\u6587\u4e2d\u7684\u3002<\/strong><\/p>\n
 var sleep = function (time) {\n    return new Promise(function (resolve, reject) {\n        setTimeout(function () {\n            resolve();\n        }, time);\n    })\n};\nvar start = async function () {     let xxx = [1,2,3,4,5,6,7,8,9,10];\n\/\/ \u9519\u8bef\u793a\u8303\nxxx.forEach(function (v) { \/\/forEach\u662f\u5faa\u73af\u51fd\u6570\n    console.log(`\u5f53\u524d\u662f\u7b2c${v}\u6b21\u7b49\u5f85..`);\n    await sleep(1000); \/\/ \u9519\u8bef!! await\u53ea\u80fd\u5728async\u51fd\u6570\u4e2d\u8fd0\u884c\n});\n\/\/ \u6b63\u786e\u793a\u8303\nfor(var v of xxx) { \/\/for\u662f\u5faa\u73af\u4f53\uff0c\u975e\u51fd\u6570\n    console.log(`\u5f53\u524d\u662f\u7b2c${v}\u6b21\u7b49\u5f85..`);\n    await sleep(1000); \/\/ \u6b63\u786e, for\u5faa\u73af\u7684\u4e0a\u4e0b\u6587\u8fd8\u5728async\u51fd\u6570\u4e2d\n}\n start();\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
async\/await\u4f5c\u4e3a\u4e00\u79cd\u4f18\u96c5\u7b80\u5355\u7684\u5f02\u6b65\u65b9\u6848\uff0c\u63a8\u8350\u6709\u6761\u4ef6\u5c3d\u91cf\u4f7f\u7528\u3002 \u4e00\u4e2a\u4f8b\u5b50 \u5b9e\u73b0\u4e00\u4e2a\u6682\u505c\u529f\u80fd var s […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[414],"class_list":["post-257","post","type-post","status-publish","format-standard","hentry","category-15","tag-node"],"_links":{"self":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/257","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=257"}],"version-history":[{"count":9,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/257\/revisions"}],"predecessor-version":[{"id":429,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/257\/revisions\/429"}],"wp:attachment":[{"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=257"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=257"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wyxxt.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=257"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}