一种无new创建对象的方法

var L=function(){
   var obj = {
      age:38,
      live:true,
      job:"web dev"
   };
   
   obj.name = "zhouhui";
   obj.__proto__ = L.prototype;
   
   return obj;

};

L.prototype={
   getName:function(){
      console.log(this.name);
   },
   getAge:function(){
      console.log(this.age);
   },
   getJob:function(){
      console.log(this.job);
   }
}

var p = L();
console.log(p); 
console.log(p.getJob());  //web dev
console.log(p instanceof L); //true