<html>
<head>
</head>
<body>
<script type="text/javascript">
alert("---begin--");
function Dog(){
this.wow=function(){
alert("wow");
}
this.yelp= function(){
//this.wow();
alert("Dog yelp");
}
}
function MadDog(){
}
MadDog.prototype = new Dog();
MadDog.prototype.yelp = function(){
//setInterval("Dog.prototype.yelp.apply(this,arguments);",500);
//alert("我是子类方法yelp");
Dog.prototype.yelp.call(this);
}
var instance = new MadDog();
instance.yelp();
alert("-----end-----");
//clearInterval();
alert("------clear----");
</script>
</body>
</html>
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