按钮
<a href="javasript:void(0);"onclick="settime(this);">获取手机验证码</a>
倒计时js
???<script> ???????var countdown=60; ????????function settime(obj) { ????????????if (countdown == 0) { ????????????????obj.getAttributeNode(‘onclick‘).value ="settime(this);"; ??????????????????obj.textContent="免费获取验证码"; ????????????????countdown = 60; ????????????????return; ???????????} else { ????????????????obj.getAttributeNode(‘onclick‘).value ="javascript:void(0);"; ???????????????obj.setAttribute("disabled", true); ????????????????obj.textContent="重新发送(" + countdown + ")"; ????????????????countdown--; ????????????} ????????setTimeout(function() { ????????????settime(obj) ????????????},1000) ????????} ???</script>js,JQ获取短信验证码倒计时
原文地址：https://www.cnblogs.com/wangzhaobo/p/9055561.html