1 <html>
2 <head>
3 <title>1</title>
4 </head>
5 <body>
6 <script language='javascript'>
7 function Point(x,y){
8 this.x=x;
9 this.y=y;
10 this.fun1=function(){
11 return this.x+'/'+this.y;
12 }
13 }
14 Point.prototype.valueOf=function(){
15 return this.x+':'+this.y;
16 }
17 function Wu(){
18 this.x=1;
19 this.y=2;
20 }
21 var p=new Point(26,28);
22 var obj=new Wu();
23 document.write(p.valueOf());
24 document.write('<br/>');
25 document.write(p.fun1.apply(obj));
26 //因为fun1是原先定义的，所以无需用prototype来加以引用；当然用
27 //prototype的，得用类名Point来引用；而apply的调用，就是valueOf函数的
28 //this指向obj;所以输出来的是1,2
29 alert(Point.prototype.valueOf.apply(obj));
30 </script>
31
32 </body>
33 </html>
