两张图片的轮播 

 1 <!DOCTYPE html>
 2 <html>
 3 <head lang="en">
 4     <meta charset="UTF-8">
 5     <title></title>
 6     <script>
 7         var myinterval="";
 8         function changeimg(obj){
 9             if(obj.value=="开始"){
10                 obj.value="停止";
11                 myinterval=window.setInterval("startit()",20);
12             }else{
13                 obj.value="开始";
14                 window.clearInterval(myinterval);
15             }
16         }
17         function startit(){
18             var picarray=new Array("pic/01.jpg","pic/02.jpg","pic/03.jpg","pic/04.jpg",
19                     "pic/05.jpg","pic/06.jpg","pic/07.jpg");
20 
21             var index=Math.round(Math.random()*picarray.length-1);//因为长度要比索引大要减1
22             var index2=Math.round(Math.random()*picarray.length-1);
23             index=index==-1?0:index;
24             document.getElementById("pc01").src=picarray[index];
25             index2=index2==-1?0:index2;
26             document.getElementById("pc02").src=picarray[index2];
27         }
28     </script>
29 </head>
30 <body>
31 
32 <div id="div1">
33     <img src="pic/01.jpg" id="pc01">
34 </div>
35 <input type="button" value="开始" onclick="changeimg(this);">
36 <div id="div2">
37     <img src="pic/03.jpg" id="pc02">
38 </div>
39 </body>
40 </html>

 

posted on 2017-06-18 19:39  天空很蓝啊  阅读(285)  评论(0)    收藏  举报

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