<!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>
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