js实现图片轮播

实现图片轮播的效果
 1 <script language =javascript > 
 2 function $(id){
 3     return document.getElementById(id);
 4 }
 5 var curIndex = 0; 
 6 //时间间隔 单位毫秒 
 7 var times = 1000; 
 8 var arr = [];
 9 arr[0] = "0.jpg"; 
10 arr[1] = "1.jpg"; 
11 arr[2] = "2.jpg"; 
12 arr[3] = "3.jpg"; 
13 arr[4] = "4.jpg"; 
14 arr[5] = "5.jpg"; 
15 arr[6] = "6.jpg"; 
16 setInterval(function(){ 
17     var obj = $("obj"); 
18     if (curIndex==arr.length-1)  
19     { 
20         curIndex=0; 
21     } 
22     else 
23     { 
24         curIndex+=1; 
25     } 
26     obj.src = arr[curIndex]; 
27 } ,times); 
28 </script>
29 <img id=obj src ="0.jpg"/>