<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
var countdown=60;
function sendemail(){
var obj = $("#btn");
settime(obj);
}
function settime(obj) { //发送验证码倒计时
if (countdown == 0) {
obj.attr('disabled',false);
//obj.removeattr("disabled");
obj.val("免费获取验证码");
countdown = 60;
return;
} else {
obj.attr('disabled',true);
obj.val("重新发送(" + countdown + ")");
countdown--;
}
setTimeout(function() {
settime(obj) }
,1000)
}
</script>
<body>
<input type="button" id="btn" value="免费获取验证码" onclick="sendemail()" />
</body>
</html>