腾讯笔试遇到的一道题，百思不得其解，求助大牛们解答

function hardMan(str) { this.queue = [] this.name = str this.queue.push(() => { console.log(this.name); this.next() }); } hardMan.prototype.rest = function (wait) { const func = () => { setTimeout(() => { console.log(`Start learning after ${wait} seconds`) this.next() }, wait * 1000) } this.queue.push(func) return this } hardMan.prototype.restFirst = function (wait) { const func = () => { setTimeout(() => { console.log(`Start learning after ${wait} seconds`) this.next() }, wait * 1000) } this.queue.unshift(func) return this } hardMan.prototype.learn = function (str) { const func = () => { console.log(`Learning ${str}`) } this.queue.push(func) this.next() } hardMan.prototype.next = function () { if (this.queue.length === 0) return const func = this.queue.shift() func() } const HardMan = (name)=>{ return new hardMan("jack"); }

class HardMan {constructor(name) {this.name = name;this.taskQueue = Promise.resolve();//考察执行栈和事件循环 setTimeout(() => {this.execute();})}execute() {if (this._restFirst) {this.realRest(this._restFirst);this._restFirst = 0;}this.outName();if (this._rest) {this.realRest(this._rest)}if (this._learn) {this.taskQueue = this.taskQueue.then(() => {console.log(`Learning ${this._learn}`)});}}outName() {this.taskQueue = this.taskQueue.then(() => {console.log(`I am ${this.name}`)});return this;}rest(seconds) {this._rest = seconds;return this;}realRest(seconds) {this.taskQueue = this.taskQueue.then(() => { return new Promise(resolve => {setTimeout(() => {console.log(`After rest ${seconds} seconds`);resolve();}, seconds * 10);});});return this;}restFirst(seconds) {this._restFirst = seconds;return this;}learn(subject) {this._learn = subject;return this;}}

function Hard(str){     var that = {};     that.__proto__ = arguments.callee.prototype ;     that.str = "I am " + str;     setTimeout(that.settime.bind(that));     return that; } Hard.prototype.yanchi = function(m){     console.log("sleep")     var d = new Date();     var n = this._restFirst*1000;     for(var i = 0; i < d; i++){         if( new Date() - d > n ){             console.log("sleep end")             return false;         }     } } Hard.prototype.learn = function( sr ) {     this._learn = sr;     return this; } Hard.prototype.rest = function( num ){     this._rest = num;     return this; } Hard.prototype.restFirst = function ( n ) {     this._restFirst = n;     this._rest = 0;     return this; } Hard.prototype.settime = function(){     var { str, _learn, _rest, _restFirst} = this;     var num = _rest || _restFirst;     if( _restFirst !== undefined ){         this.yanchi();     }else{         console.log(str);     }     if(num){         setTimeout(function(){             console.log( `Start learning after ${ num } seconds` );             if( _restFirst !== undefined ){                 console.log(str);             }             if( _learn ){                 console.log( "Learning " + _learn )             }         },_rest*1000)     } }

去年腾讯面试遇到了这道题，当时没写出来，后来想了想写出来了，给大家两个种满分解题代码吧：https://mp.weixin.qq.com/s/-hEjxY0yI6ZBTzAlc3xwAw

跟lazyman一摸一样的呀

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