Promise\u662f\u5f02\u6b65\u7f16\u7a0b\u7684\u4e00\u79cd\u89e3\u51b3\u65b9\u6848\uff1a\u4ece\u8bed\u6cd5\u4e0a\u8bb2\uff0cpromise\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4ece\u5b83\u53ef\u4ee5\u83b7\u53d6\u5f02\u6b65 \u64cd\u4f5c\u7684\u6d88\u606f\uff1b\u4ece\u672c\u610f\u4e0a\u8bb2\uff0c\u5b83\u662f\u627f\u8bfa\uff0c\u627f\u8bfa\u5b83\u8fc7\u4e00\u6bb5\u65f6\u95f4\u4f1a\u7ed9\u4f60\u4e00\u4e2a\u7ed3\u679c\u3002promise\u6709\u4e09\u79cd\u72b6 \u6001\uff1apending(\u7b49\u5f85\u6001)\uff0cfulfiled(\u6210\u529f\u6001)rejected(\u5931\u8d25\u6001)\uff1b\u72b6\u6001\u4e00\u65e6\u6539\u53d8\uff0c\u5c31\u4e0d\u4f1a\u518d\u53d8\u3002 \u521b\u9020promise\u5b9e\u4f8b\u540e\uff0c\u5b83\u4f1a\u7acb\u5373\u6267\u884c\u3002
\nfs. readFile(‘somefile. txt’, function (e, data) {
\nif (e) {
\nconsole. log(e)\uff1b
\n}
\nconsole.log(data)\uff1b
\n});
\n\u5982\u679c\u6211\u4eec\u5728\u56de\u8c03\u5185\u90e8\u6709\u53e6\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\uff0c\u5219\u6b64\u65b9\u6cd5\u5b58\u5728\u95ee\u9898\u3002\u6211\u4eec\u5c06\u6709\u4e00\u4e2a\u6df7\u4e71\u4e14\u4e0d\u53ef\u8bfb\u7684\u4ee3 \u7801\u3002\u6b64\u4ee3\u7801\u79f0\u4e3a\u300e\u56de\u8c03\u5730\u72f1\u300f\u3002
\n\/\/\u56de\u8c03\u5730\u72f1
\nfs. readFile(‘somefile. txt’, function (e, data) {
\n\/\/your code here
\nfs. readdir(‘directory’, function (e, files) {
\n\/\/your code here
\nfs. mkdir(‘directory’, function (e) {
\n\/\/your code here
\n})
\n})
\n))
\n\u5982\u679c\u6211\u4eec\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\u4f7f\u7528promise,\u5b83\u5c06\u66f4\u6613\u4e8e\u9605\u8bfb\u3001\u7406\u89e3\u548c\u7ef4\u62a4\u3002
\npromReadFile(‘file\/path’) . then(data => { return
\npromReaddir(‘directory’)\uff1b }) . then(data => { return
\npromMkdir(‘directory’)\uff1b }).catch(e => { console. log(e)\uff1b })
\npromise\u6709\u4e09\u79cd\u4e0d\u540c\u7684\u72b6\u6001\uff1a
\n1\u3001\tpending\uff1a\u521d\u59cb\u72b6\u6001\uff0c\u5b8c\u6210\u6216\u5931\u8d25\u72b6\u6001\u7684\u524d\u4e00\u4e2a\u72b6\u6001
\n2\u3001\tfulfilled\uff1a\u64cd\u4f5c\u6210\u529f\u5b8c\u6210
\n3\u3001\trejected\uff1a\u64cd\u4f5c\u5931\u8d25
\npending\u72b6\u6001\u7684Promise\u5bf9\u8c61\u4f1a\u89e6\u53d1fulfilled\/rejected\u72b6\u6001\uff0c\u5728\u5176\u72b6\u6001\u5904\u7406\u65b9\u6cd5\u4e2d\u53ef\u4ee5 \u4f20\u5165\u53c2\u6570\/\u5931\u8d25\u4fe1\u606f\u3002\u5f53\u64cd\u4f5c\u6210\u529f\u5b8c\u6210\u65f6\uff0cPromise\u5bf9\u8c61\u7684then\u65b9\u6cd5\u5c31\u4f1a\u88ab\u8c03\u7528\uff1b\u5426\u5219\u5c31\u4f1a \u89e6\u53d1catch\u3002\u5982\uff1a
\nconst myFirstPromise = new Promise((resolve, reject) => {
\nsetTimeout(function() {
\nresolve ("\u6210\u529f\uff01")\uff1b
\n}, 250)\uff1b
\n});
\nmyFirstPromise. then((data) => {
\nconsole.log("Yay! " + data)\uff1b
\n}). catch ((e) => {…});<\/p>\n","protected":false},"excerpt":{"rendered":"
Promise\u662f\u5f02\u6b65\u7f16\u7a0b\u7684\u4e00\u79cd\u89e3\u51b3\u65b9\u6848\uff1a\u4ece\u8bed\u6cd5\u4e0a\u8bb2\uff0cpromise\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4ece\u5b83\u53ef\u4ee5\u83b7\u53d6\u5f02\u6b65 \u64cd\u4f5c\u7684\u6d88\u606f\uff1b\u4ece […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-13140","post","type-post","status-publish","format-standard","hentry","category-qianduan"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/13140","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=13140"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/13140\/revisions"}],"predecessor-version":[{"id":13141,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/13140\/revisions\/13141"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=13140"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=13140"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=13140"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}