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(function (window) { var Promise = function () { this.thens = []; }; Promise.prototype = { resolve: function () { if (this.promiseArr) { for (var i = 0, j = this.promiseArr.length; i < j; i++) { this.promiseArr[i].resolveCount++; } if (this.promiseArr[0].action !== "any") { if (this.resolveCount !== this.promiseArr.length) { return; } } else { if (this.resolveCount > 1) { return; } } }   var t, n; while (t = this.thens.shift()) { var doneFn = t.done, action = t.action; if (t.alwaysCB && !doneFn) { n = t.alwaysCB.apply(null, arguments); if (n instanceof Promise) { n.thens = this.thens; break; } continue; } if (doneFn.length > 0) { var arr = []; for (var i = 0, j = doneFn.length; i < j; i++) { var m = doneFn[i].apply(null, arguments); if (m instanceof Promise) { m.thens = this.thens; arr.push(m); } }   var l = arr.length; if (l === 0) { continue; } else { for (var i = 0; i < l; i++) { arr[i].promiseArr = arr; arr[i].action = action; arr[i].resolveCount = 0; } break; } } else { n = doneFn.apply(null, arguments); if (n instanceof Promise) { n.thens = this.thens; break; } continue; }   } },   reject: function () { if (this.promiseArr && this.promiseArr[0].action === "any") { if (this.promiseArr[this.promiseArr.length - 1] !== this) { return; } } var t, n; while (t = this.thens.shift()) { if (t.fail) { n = t.fail.apply(null, arguments); if (n instanceof Promise) { n.thens = this.thens; break; } continue; } else { if (t.alwaysCB) { n = t.alwaysCB.apply(null, arguments); if (n instanceof Promise) { n.thens = this.thens; break; } continue; } } break; } },   notify: function () { var t = this.thens[0]; t.progress.apply(null, arguments); },   then: function (done, fail, progress) { this.thens.push({ done: done, fail: fail, progress: progress }); return this; },   any: function (done, fail, progress) { this.thens.push({ done: done, fail: fail, progress: progress, action: "any" }); return this; },   done: function (done) { if (this.thens.length === 0 || this.thens[this.thens.length - 1].done || this.thens[this.thens.length - 1].alwaysCB) { this.thens.push({ done: done }); } else { this.thens[this.thens.length - 1].done = done; } return this; },   fail: function (fail) { if (this.thens.length === 0 || this.thens[this.thens.length - 1].fail || this.thens[this.thens.length - 1].alwaysCB) { this.thens.push({ fail: fail }); } else { this.thens[this.thens.length - 1].fail = fail; } return this; },   progress: function (progress) { if (this.thens.length === 0 || this.thens[this.thens.length - 1].progress) { this.thens.push({ progress: progress }); } else { this.thens[this.thens.length - 1].progress = progress; } return this; },   always: function (alwaysCB) { if (this.thens.length === 0 || this.thens[this.thens.length - 1].alwaysCB || this.thens[this.thens.length - 1].done || this.thens[this.thens.length - 1].fail) { this.thens.push({ alwaysCB: alwaysCB }); } else { this.thens[this.thens.length - 1].alwaysCB = alwaysCB; } return this; }   }     window.Promise = function (prmsFn) {     if (prmsFn) { if (prmsFn === true) { var prms = new Promise();   setTimeout(function () { prms.resolve(); }, 1)   return prms; } else { var prms = prmsFn(); if (prms instanceof Promise) return prms; } } return new Promise();   };   }(window));

function asyncTask() { var promise = Promise(), itv; setTimeout(function () { clearInterval(itv); promise.resolve(); }, 3500)   itv = setInterval(function () { promise.notify(); }, 100) return promise; } function asyncTask2(aa) { alert(aa) }   Promise(asyncTask) .then(function () { console.log("finish"); }, null, function () { console.log("hanlding"); }).then(function () { return asyncTask2(111); });   //Promise(true).then(asyncTask).done(function () { // console.log("finish"); //}).progress(function () { // console.log("hanlding"); //})   //Promise(true).then(asyncTask).then(function () { // console.log("finish"); //}, null, function () { // console.log("hanlding"); //});