html代码：
<input type="button" ?value="获取验证码" ?id="getCode" style="color:#4664E6;background:white;" />
Jquery代码：别忘了引用jquery库
<script type="text/javascript"> ???????var countdown = 60; ???????$(function () { ???????????$("#getCode").bind("click", function () { ???????????????settime(); ???????????}); ???????}) ???????function settime(e) { ???????????if (countdown == 0) { ???????????????countdown = 60; ???????????????$("#getCode").val("获取验证码"); ???????????????$("#getCode").removeAttr("disabled"); ???????????????return false; ???????????} else { ???????????????countdown--; ???????????????$("#getCode").val(countdown + "秒后重新获取"); ???????????????$("#getCode").attr("disabled", "disabled"); ???????????} ???????????setTimeout(function () { ???????????????settime(); ???????????}, 1000); ???????} ???</script>Jquery验证码倒计时
原文地址：https://www.cnblogs.com/LoveQin/p/10313673.html