实现继承的两种方式 call/apply 和 prototype

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html";charset="gbk"/ >
<script type="text/javascript" >
 /*function Animal(){
   this.s="animal"; 
   }
 
 function Cat(){
    Animal.call(this);
    this.name="cat";
 }
 var animal=new Animal();
 var cat=new Cat;
     alert(cat.s);*/                                   animal
 
  function Animal(){}
 Animal.prototype.s="animal";
 function Cat(){
     this.name="cat";
 }
    Cat.prototype=Animal.prototype;
 var animal=new Animal();
 var cat=new Cat;
     alert(cat.s);                                      animal

</script>
</head>
<body>
   
</body>
</html>

posted @ 2014-02-20 20:44  birdlow  阅读(102)  评论(0)    收藏  举报