代码：
<html> <head> <title>让div动的测试</title> <script language="javascript"> X=3; Y=0; divX=0; divY=0; function Move(){ divX+=X; divY+=Y; div1.style.left=divX+"px"; div1.style.top=divY +"px"; if(divX+div1.offsetWidth>=document.body.clientWidth|div1.style.left<=0){ X=-X; } } setInterval("Move()",10); </script> </haed> <body> <div id="div1" style="100px;height:100px;background-color:red;position:absolute"> 碰撞 </div> </body> </html>