面向?qū)ο蟮囊粋€簡單的例子：

<script>
    /*構(gòu)造函數(shù)（函數(shù)名采用大駝峰）*/
function CreatePerson(name,age){
    this.name = name;
    this.age = age;
}
CreatePerson.prototype.showName = function(){
    return this.name;
};
CreatePerson.prototype.showAge = function(){
    return this.age;
};
var p1 = new CreatePerson('aaa',12);
var p2 = new CreatePerson('bbb',18);
console.log('p1的名字：'+p1.showName());//aaa
console.log(p1.showAge === p2.showAge);//true
/*instanceof檢查父級实苞、父級的父級...辆飘，正確返回true，不正確返回false*/
console.log("instanceof檢查父級升酣、父級的父級...檬洞，正確返回true，不正確返回false");
console.log(p1 instanceof CreatePerson);//true
console.log(p1 instanceof Object);//true
console.log(CreatePerson instanceof Object);//true
/*這里有一個坑狡恬，p1不是Function的子集珠叔，但是CreatePerson是*/
console.log(p1 instanceof Function);//false
console.log(CreatePerson instanceof Function);//true
/*constructor只檢查父級*/
console.log("constructor只檢查父級");
console.log(p1.constructor == CreatePerson);
console.log(p1.constructor == Object);
</script>

像數(shù)組Array、Date等封裝好的也有這樣的問題弟劲，比如數(shù)組：

//var arr = [1,2];
 var arr=new Array(1,2);
 console.log(arr instanceof Array);//true
 console.log(Array instanceof Object);//true
 console.log(arr instanceof Object);//true

 console.log(arr instanceof Array);//true
 console.log(Array instanceof Function);//true
 console.log(arr instanceof Function);//false

繼承

<script>
   function Person(name,age){
      this.name='are you die?'+name;
      this.age=age;
   };
   Person.prototype.showName=function(){
      return this.name;
   };
   Person.prototype.showAge=function(){
      return this.age;
   };
   function Worker(name,age,job){
      /*屬性繼承祷安，這三種方法都可以*/
      //Person.call(this,name,age);
      //Person.apply(this,[name,age]);
      Person.apply(this,arguments);
      this.job=job;
   };
   Worker.prototype.showJob=function(){
      return this.job;
   };
   //方法繼承一 
  Worker.prototype=new Person();
   /*new過以后父級指向變成了person，所以需要指定一下父級*/
   Worker.prototype.constructor=Worker;
   /*方法繼承二*/
   /*for(var name in Person.prototype){
      Worker.prototype[name]=Person.prototype[name];
   }*/
   var w1=new Worker('小明','18','醫(yī)生');
   //alert(w1.showJob());
   alert(w1.showAge());
   //alert(w1.constructor==Person);//false
   alert(w1.constructor==Worker);//true
</script>