<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>类式继承模式#3——借用和设置原型</title>
</head> <body>
<script type="text/javascript"> function Parent(name){
this.name=name||'Adam';
}; Parent.prototype.say=function(){
console.log(this.name);
}; function Child(name){
Parent.apply(this,arguments);
}; Child.prototype=new Parent(); /***************************************/ var kid=new Child('Janking'); console.log(kid.name);
kid.say(); //缺点:父构造函数被调用了两次,因此导致了其效率低下的问题,最后,自身的属性会被继承两次。 </script>
</body>
</html>