<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js实现倒计时60秒</title>
<script type="text/javascript" src="js/jquery-1.11.1.min.js"></script>
</head>
<script href=""></script>
<body>
<input type="button" id="btn" value="获取验证码" onclick="settime(this)" />
<script type="text/javascript">
var countdown=60;//设置起始时间
function settime(val) {
if (countdown == 0) {
val.removeAttribute("disabled");
val.value="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)//回调函数
}
}
</script>
</html>
