call方法是Function对象中的方法,因此我们定义的每个函数都拥有该方法。可以通过函数名来调用call方法,call方法的第一个参数会被传递给函数中的this,从第2个参数开始,挨个赋值给函数中的参数
function person(name){
alert(name+" : "+this.hobby);
}
var obj=new Object();
obj.hobby="打酱油";
person.call(obj,"小张");
(2)
1 <script language="javascript" type="text/javascript">
2 function Parent(name){
3 this.name=name;
4 this.sayHello=function(){
5 alert(this.name);
6 }
7 }
8 function Child(name,hobby){
9 this.hobby=hobby;
10 Parent.call(this,name);
11 this.say=function(){
12 alert(this.name+" : " +this.hobby);
13 }
14 }
15 var ch=new Child("小明","打酱油");
16 ch.sayHello();
17 ch.say();
18 </script>
apply方法实现继承
1
2 function Parent(name){
3 this.name=name;
4 this.sayHello=function(){
5 alert(this.name);
6 }
7 }
8 function Child(name,hobby){
9 this.hobby=hobby;
10
11 Parent.apply(this,[name]/* 或者new Array(name) */);
12 this.say=function(){
13 alert(this.name+" : "+this.hobby);
14 }
15 }
16 var ch=new Child("小明","打酱油");
17 ch.sayHello();
18 ch.say();