<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
//打印函数
var _=function(o){
document.write(o+"<br/>");
}
//打印数组的函数
var _a=function(arr){
for(var t in arr)
_(arr[t]);
}
//对象定义方法2
function Stu(id,name){
this.id=id;
this.name=name;
this.getName=function(){
return this.name;
}
}
//定义子类，大学生
function BigStu(id,name)
{
this.id=id;
this.name=name;
}
//继承方式1，prototype
BigStu.prototype=new Stu(1,"");
//初始化大学生
var bs=new BigStu(1,"陈新");
_(bs.name);
_(bs.getName());
//继承方式2，call
function LittleStu(id,name)
{
Stu.call(this,id,name);
}
//调用
var ls=new LittleStu(2,'余意');
_(ls.name);
_(ls.getName());
//继承方式3，apply
function PrimaryStu(id,name)
{
Stu.apply(this,arguments);
}
//调用
var ps=new PrimaryStu(3,'小余意');
_(ps.name);
_(ps.getName());
//继承方式4，最古老的的写法。冒充法
function OldStu(id,name)
{
this.Stu=Stu;//对象冒充当前类的属性
this.Stu(1,"老余意")//给冒充的父类初始化.其实就是实例化
delete this.Stu;
}
//调用
var os=new OldStu(3,'老余意');
_(os.name);
_(os.getName());
</script>
</HEAD>
<BODY>
</BODY>
</HTML>