<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.11.2/jquery.min.js"></script>
<script type="text/javascript">
var countdown=60;
function sendCode(){
var a = $("#btn");
outtime(a);
}
function outtime(o) { //发送验证码倒计时
if (countdown == 0) {
o.attr('disabled',false);
o.val("获取验证码");
countdown = 60;
return;
} else {
o.attr('disabled',true);
o.val("重新发送验证码(" + countdown + ")");
countdown--;
}
setTimeout(function() {
outtime(a) }
,1000)
}
</script>
<body>
<input type="button" id="btn" value="获取验证码" onclick="sendCode()" />
</body>
</html>
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