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);
}