{"id":273,"date":"2021-07-13T11:21:40","date_gmt":"2021-07-13T03:21:40","guid":{"rendered":"http:\/\/gjweb.top\/?p=273"},"modified":"2021-07-15T14:05:25","modified_gmt":"2021-07-15T06:05:25","slug":"%e6%89%8b%e5%86%99-promise","status":"publish","type":"post","link":"https:\/\/gjweb.top\/?p=273","title":{"rendered":"\u624b\u5199 Promise"},"content":{"rendered":"\n<p>Promise\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4fdd\u5b58\u7740\u672a\u6765\u5c06\u8981\u7ed3\u675f\u7684\u4e8b\u4ef6\uff0c\u4ed6\u6709\u4e24\u4e2a\u7279\u5f81\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5bf9\u8c61\u7684\u72b6\u6001\u4e0d\u53d7\u5185\u90e8\u5f71\u54cd\uff0cPromise\u5bf9\u8c61\u4ee3\u8868\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\uff0c\u6709\u4e09\u79cd\u72b6\u6001\uff0cpending\u8fdb\u884c\u4e2d\uff0cfulfilled\u5df2\u6210\u529f\uff0crejected\u4ee5\u5931\u8d25\uff0c\u53ea\u6709\u5f02\u6b65\u64cd\u4f5c\u7684\u7ed3\u679c\uff0c\u624d\u53ef\u4ee5\u51b3\u5b9a\u5f53\u524d\u662f\u54ea\u4e00\u79cd\u72b6\u6001\uff0c\u4efb\u4f55\u5176\u4ed6\u64cd\u4f5c\u90fd\u65e0\u6cd5\u6539\u53d8\u8fd9\u4e2a\u72b6\u6001\u3002<\/li><li>\u4e00\u65e6\u72b6\u6001\u6539\u53d8\uff0c\u5c31\u4e0d\u4f1a\u5728\u53d8\uff0cpromise\u5bf9\u8c61\u72b6\u6001\u6539\u53d8\u53ea\u6709\u4e24\u79cd\u53ef\u80fd\uff0c\u4ecepending\u6539\u5230fulfilled \u6216\u8005 \u4ecepending \u6539\u5230 rejected \uff0c\u53ea\u8981\u8fd9\u4e24\u79cd\u60c5\u51b5\u53d1\u751f\uff0c\u72b6\u6001\u5c31\u51dd\u56fa\u4e86\uff0c\u4e0d\u4f1a\u5728\u6539\u53d8\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u79f0\u4e3a\u5b9a\u578bresolved<\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u624b\u5199\u5b9e\u73b0promise<\/h2>\n\n\n\n<p>\u9075\u5faa Promise  A+ \u89c4\u8303<\/p>\n\n\n\n<p><a href=\"https:\/\/juejin.cn\/post\/6844903649852784647\">https:\/\/juejin.cn\/post\/6844903649852784647<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\nclass Promise2{\n  state= \"pending\"\n  callbacks = &#91;]\n  \n  constructor(fn:any){\n    if(typeof fn !== \"function\"){\n      throw new Error(\"promise \u63a5\u6536\u7684\u662f\u4e00\u4e2a\u51fd\u6570\")\n    }\n    fn(this.resolve.bind(this),this.reject.bind(this))\n  }\n\n  resolve(value:any){\n    setTimeout(()=&gt;{\n      if(this.state !== \"pending\"){return}\n      this.state = \"fulfilled\"\n      this.callbacks.forEach((handle)=&gt;{\n        if(typeof handle&#91;0] === \"function\"){\n          \/\/ @ts-ignore\n          handle&#91;0].call(undefined,value)\n        }\n      })\n    },0)\n  }\n  reject(reason:any){\n    setTimeout(()=&gt;{\n      if(this.state !== \"pending\"){return}\n      this.state = \"rejected\"\n      this.callbacks.forEach((handle)=&gt;{\n        if(typeof handle&#91;1] === \"function\"){\n          \/\/ @ts-ignore\n          handle&#91;1](reason)\n        }\n      })\n    },0)\n  }\n\n  \/\/ @ts-ignore\n  then(succeed?:any,fali?:any){\n    \/\/ @ts-ignore\n    const hande = &#91;]\n    if(typeof succeed === \"function\"){\n      hande&#91;0] = succeed\n    }\n    if(typeof fali === \"function\"){\n      hande&#91;1] = fali\n    }\n    \/\/ @ts-ignore\n    this.callbacks.push(hande)\n  }\n\n}\nexport default Promise2<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Promise\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4fdd\u5b58\u7740\u672a\u6765\u5c06\u8981\u7ed3\u675f\u7684\u4e8b\u4ef6\uff0c\u4ed6\u6709\u4e24\u4e2a\u7279\u5f81\uff1a \u5bf9\u8c61\u7684\u72b6\u6001\u4e0d\u53d7\u5185\u90e8\u5f71\u54cd\uff0cPromise\u5bf9\u8c61 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[],"class_list":["post-273","post","type-post","status-publish","format-standard","hentry","category-js"],"_links":{"self":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/273","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=273"}],"version-history":[{"count":0,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/273\/revisions"}],"wp:attachment":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}