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<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>实践题 - 选项卡</title>
    <style type="text/css">
div{

            width:200px;
           height:200px;
           background:red;

        }


    </style>
    <script type="text/javascript">
    window.onload=function(){
  startMove();
}
function startMove(){
  setInterval(function(){
   var oDiv=document.getElementById("div1");
   oDiv.style.width=oDiv.offsetWidth-1+'px'
  },30)
}



    </script>

</head>
<body>
<div id="div1"></div>

</body>
</html>

慕先生0450854

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