<!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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