<body>
<h2>操作成功<h2/>
<span id="sec">5<span/>
<span>秒后回到主页<input type="button" value="返回" onclick="dd()"> </span><!--先编写好网页布局-->
<script type="text/javascript">
var secd=document.getElementById("sec").innerHTML;
function lala(){
secd--;
document.getElementById("sec").innerHTML=secd;
};
setInterval("lala()",1000);
<script/>
stone310
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