让元素跟随鼠标移动

 1 <!DOCTYPE html>
 2 <html lang="zh-cn">
 3 <head>
 4     <meta charset="utf-8">
 5     <title>7-76 课堂演示</title>
 6     <link rel="stylesheet" type="text/css" href="style.css">
 7     <style type="text/css">
 8         div{
 9             margin: 15px auto;
10             background: orange;
11             width: 200px;
12             height: 200px;
13             padding: 15px;
14             border-radius: 200px;
15             position: absolute;
16         }
17     </style>
18 </head>
19 <body>
20 <!-- <div id="div1"></div> -->
21 
22     <script>
23         var div1=document.getElementById('div1')
24         // function moveBall(e){
25         //     var sy=document.documentElement.scrollTop||document.body.scrollTop
26         //     div1.style.left=e.clientX+'px';
27         //     div1.style.top=e.clientY+sy+'px';
28 
29         // }
30 
31         // document.onmousemove=moveBall
32         function myFun1(e){
33             var num=30;
34             var divs=document.getElementsByTagName('div')
35             var body=document.getElementsByTagName('body')[0]
36 
37             for(var i=0;i<num;i++){
38                 var rad=Math.floor(Math.random()*10)+'px'
39                 divs[i]=document.createElement('div')
40                 divs[i].style.background='rgb('+4*i+','+2*i+','+i+')'
41                 divs[i].style.width=divs[i].style.height=rad
42                 divs[i].style.position='absolute'
43                 divs[0].style.left=e.clientX+'px';
44                 divs[0].style.top=e.clientY+'px';
45                 divs[i].style.left=e.clientX+Math.floor(Math.random()*10*i)+'px';
46                 divs[i].style.top=e.clientY+Math.floor(Math.random()*10*i)+'px';
47                 body.appendChild(divs[i])
48             }
49 
50         }
51         // document.onmousemove=myFun1
52         document.onmousedown=myFun1
53 
54     </script>
55 </body>
56 </html>