<script type="text/javascript">
/*//继承的第一种方式：对象冒充
function parent(username){
this.username=username;
this.sayhello=function(){
alert(this.username)
}
}
function child(username,password){
//下面三行代码最关键
this.method=parent;
this.method(username);
this.password=password;
this.sayword=function(){
alert(this.password);
}
}
var parent= new parent("zhangsan");
var child=new child("lishi","123");
parent.sayhello();
child.sayhello();
child.sayword();*/
/*//继承第二种方法：call方法方式，function 对象的中方法
function test(str){
alert(this.name+str);
}
var object=new Object();
object.name="zhangsan";
//this.call相当于调用test函数
test.call(object,"ningkangchun");//将object赋给了this*/
//使用原形链（prototype chain）方法实现对象的继承
</script>
