es5和es6实现lazyman

es6实现
 1 class _LazyMan {
   constructor(name) {
     this.tasks = [];
     this.sleep = this.sleep.bind(this);
     this.eat = this.eat.bind(this);
     this.tasks.push(((name) => {
       return () => {
         console.log('Hi! This is ' + name + '!');
           this.next();
       }
    })(name));
      setTimeout(() => {
        this.next();
      }, 0);
   }

   next() {
     const fn = this.tasks.shift();
     fn && fn();
   }
   eat(name) {
     const fn = (() => {
       return () => {
         console.log('Eat '+ name +'~');
         this.next();
       }
     })(name);
     this.tasks.push(fn);
     return this;
   }
   sleep(time) {
     const fn = (() => {
       return () => {
         setTimeout(() => {
           console.log('Wake up after '+ time +'s!');
           this.next();
         }, time * 1000);
       }
     })(time);
     this.tasks.push(fn);
     return this;
   }
   sleepFirst(time) {
     const fn = () => {
       setTimeout(() => {
         console.log('Wake up after '+time+'s!');
         this.next();
       },time*1000);
     }
     this.tasks.unshift(fn);
     return this;
   }
 }

 const LazyMan = (name) => {return new _LazyMan(name)}

es5实现
 1 function _LazyMan(name){
     this.tasks=[];
     var self=this;
     var fn=(function(n){
         var name=n;
         return function(){
             console.log('Hi! This is '+name+'!');
             self.next();
         }
     })(name);
     this.tasks.push(fn);
     setTimeout(function(){
         self.next();
     },0);
 }

 _LazyMan.prototype.next=function(){
     var fn=this.tasks.shift();
     fn&&fn();
 }
 _LazyMan.prototype.eat=function(name){
     var self=this;
     var fn=(function(name){
         return function(){
             console.log('Eat '+name+'~');
             self.next();
         }
     })(name);
     this.tasks.push(fn);
     return this;
 }
 _LazyMan.prototype.sleep=function(time){
     var self=this;
     var fn=(function(time){
         return function(){
             setTimeout(function(){
                 console.log('Wake up after '+time+'s!');
                 self.next();
             },time*1000);
         }
     })(time);
     this.tasks.push(fn);
     return this;
 }
 _LazyMan.prototype.sleepFirst=function(time){
     var self=this;
     var fn=(function(time){
         return function(){
             setTimeout(function(){
                 console.log('Wake up after '+time+'s!');
                 self.next();
             },time*1000);
         }
     })(time);
     this.tasks.unshift(fn);
     return this;
 }
 //封装
 function LazyMan(name){
     return new _LazyMan(name);
 }