<script>var num = document.getElementById("second");var counter = num.innerHTML;function count(){counter--;num.innerHTML=counter;if(counter==0){window.location.assign("http//:www.imooc.com");}}setInterval("count()",1000);function back(){window.history.back();}</script><h1>操作成功</h1><span id="second">5</span><span>秒后回到主页</span><input type="button" value="返回" onclick="back()">
1 回答
业余奶茶品鉴师
TA贡献260条经验 获得超388个赞
把js写到html后面就可以了，是渲染先后的问题，按照你的写法document.getElementById("decond")取不到
按照下面那这样写就可以了，记得采纳
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=<device-width>, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
padding: 0;
margin: 0;
}
</style>
</head>
<body>
<h1>操作成功</h1>
<span id="second">5</span>
<span>秒后回到主页</span>
<input type="button" value="返回" onclick="back()">
</body>
<script>
var num = document.getElementById("second");
var counter = num.innerHTML;
function count() {
counter--;
num.innerHTML = counter;
if (counter == 0) {
window.location.assign("http//:www.imooc.com");
}
}
setInterval("count()", 1000);
function back() {
window.history.back();
}
</script>
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