点击按钮出现60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=60;

function settime(val) {

if (countdown == 0) {

val.removeAttribute("disabled");

val.value="免费获取验证码";

countdown = 60;

} else {

val.setAttribute("disabled", true);

val.value="重新发送(" + countdown + ")";

countdown--;

}

setTimeout(function() {

settime(val)

},1000)

}

</script>

</body>

</html>