用setInterval来做图片切换最简单源码

<script language =javascript >
 var curIndex=0;
 //时间间隔 单位毫秒 1000毫秒=1秒
 var timeInterval=3000;
 var arr=new Array();
 arr[0]="images/01.jpg";
 arr[1]="images/02.jpg";
 arr[2]="images/03.jpg";
 arr[3]="images/04.jpg";
 arr[4]="images/05.jpg";
 arr[5]="images/06.jpg";
 arr[6]="images/07.jpg";
setInterval(changeImg,timeInterval);
function changeImg()
{
    var obj=document.getElementById("pic");
    if (curIndex==arr.length-1)
    {
        curIndex=0;
    }
    else
    {
        curIndex+=1;
    }
    obj.src=arr[curIndex];
}
</script>

<img id=pic src ="images/01.jpg" border =0 />