<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>8-17编程练习</title>
</head>
<body>
<!--先编写好网页布局-->
<div id="hint">
<h2>操作成功</h2>
<span><b id="second"></b>前往慕课网<a href="javascript:void(0)" onclick="window.history.back()">返回</a></span>
</div>
<button id="skbut" onclick="skip()">前往慕课网</button>
<script language="javascript" type="text/javascript">
var hint = document.getElementById("hint");
hint.style.display = "none";
var skbut = document.getElementById("skbut");
skbut.style.display = "block";
skbut.style.cursor = "pointer";
var second = 5;
function sum(){
second--;
document.getElementById("second").innerHTML = second;
if(second > 0){
setTimeout(sum,1000);
}else{
clearTimeout;
}
};
function window_(){
window.open('https://www.imooc.com/','_self');
}
function skip(){
if(hint.style.display == "none"){
hint.style.display = "block";
skbut.style.display = "none";
};
document.getElementById("second").innerHTML = second;
setTimeout(sum,1000);
setTimeout(window_,5000);
};
</script>
</body>
</html>
