点击按钮出现5秒倒计时js代码

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" src="js/jquery.js"></script>
</head>

<body>
 <input type="button" id="btn" value="免费获取验证码" onclick="settime(this)" />

 <script type="text/javascript">
var countdown=5;
function settime(val) {
if(countdown != 0){
val.setAttribute("disabled", true);
val.value="重新发送(" + countdown + ")";
countdown--;
}else {
 val.removeAttribute("disabled");   
 val.value="免费获取验证码";
 countdown = 5;

return;//避免无限循环
 }
setTimeout(function() {
settime(val)
},1000)
}
</script>
</body>
</html>

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