<p>操作成功</p>
<p><span id="time">5</span>秒后回到主页<a href="javascript:backup()">返回</a></p>
<script type="text/javascript">
var num=document.getElementById("time").innerHTML;
function con(){
num--;
document.getElementById("time").innerHTML=num;
if(num==0){
location.assign("http://www.imooc.com");
}
var i=setInterval("con",1000);
if(num==0){
clearInterval(i);
}
}
function back(){
window.history.back();
}
2016-06-12
<script type="text/javascript">
var sec=document.getElementById("time");
var num = 5;
function con(){
num--;
sec.innerHTML=num;
if(num==0){
location.assign("http://www.imooc.com");
}
//if(num==0){
// clearInterval(i);
//}
}
var i=setInterval(con,1000);
function back(){
window.history.back();
}
</script><script>部分修改如上：
setInterval()放到外面，num初值是5，然后--，num和sec不要混淆
举报
