css与js相结合，前端使用原生的JavaScript
只在前端获取验证码的话可以使用随机数获取到，进行比对。
如果需要模拟发送短信的验证码，需要在后端使用腾讯云或阿里云的短信服务，具体操作可以查询哔哩哔哩！！！
<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="Pragma" content="no-cache"><meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no" /><meta name="format-detection" content="telephone=yes" /><meta name="apple-mobile-web-app-capable" content="yes" /><meta name="apple-mobile-web-app-status-bar-style" content="black" /><title>绑定信息</title><!-- Bootstrap core CSS--><!-- 最新版本的 Bootstrap 核心 CSS 文件 --><link rel="stylesheet" href="/bootstrap/3.3.7/css/bootstrap.min.css"><style type="text/css">body {margin: 0;padding: 0;}.modal_content {padding: 30px;display: flex;justify-content: center;flex-direction: column;}.modal_content>div {margin-bottom: 20px;}.modal_content>h5:first-child {margin: 30px 0px;}#dialog label {color: #666;}#phone1 {display: block;width: 100%;height: 70px;background: none;padding-top: 30px;border: 0;outline: none;text-align: center;margin-top: -30px;font-size: 16px;border-bottom: 1px solid rgba(0, 0, 0, .2);border-radius: 0;}.code1 {display: flex;flex-direction: row;justify-content: space-between;width: 100%;height: 70px;background: none;padding-top: 30px;margin-top: -30px;font-size: 16px;border-bottom: 1px solid rgba(0, 0, 0, .2);border-radius: 0;}#code1 {width: calc(100% - 90px);height: 55px;background: none;padding-top: 20px;border: 0;outline: none;text-align: center;margin-top: -20px;font-size: 16px;}#btnSendCode1 {width: 90px;height: 30px;padding: 0 5px;margin: 0;font-size: 14px;text-align: center;background: transparent;border-radius: 30px;color: #a07941;border-color: #a07941;}::-webkit-input-placeholder {/* WebKit browsers */font-size: 14px;color: rgba(0, 0, 0, .4);}:-moz-placeholder {/* Mozilla Firefox 4 to 18 */font-size: 14px;color: rgba(0, 0, 0, .4);}::-moz-placeholder {/* Mozilla Firefox 19+ */font-size: 14px;color: rgba(0, 0, 0, .4);}:-ms-input-placeholder {/* Internet Explorer 10+ */font-size: 14px;color: rgba(0, 0, 0, .4);}.next {text-align: center;margin: 20px 0;}.next button {width: 100%;height: 45px;padding: 0;margin: 0;background: #007BFF;color: #fff;border: 0;outline: none;border-radius: 3px;}</style></head><body><div class="modal_content"><h5>绑定用户信息！</h5><div><label for="phone1">注册手机号：</label><br /><input id="phone1" type="text" autocomplete="off" placeholder="请输入已绑定的手机号" /></div><div><label for="code1">验证码：</label><div class="code1"><input id="code1" type="text" autocomplete="off" placeholder="短信验证码" /><input id="btnSendCode1" type="button" class="btn btn-default" value="获取验证码" onClick="sendMessage1()" /></div></div><div class="next"><button onclick="binding()">确定</button></div></div><script src="/jquery/jquery-1.10.2.js"></script><script src="/bootstrap/3.3.7/js/bootstrap.min.js"></script><script>var phoneReg = /(^1[3|4|5|7|8]\d{9}$)|(^09\d{8}$)/;//手机号正则 var count = 60; //间隔函数，1秒执行var InterValObj1; //timer变量，控制时间var curCount1;//当前剩余秒数/*第一*/function sendMessage1() {curCount1 = count;var phone = $.trim($('#phone1').val());console.log(phone, 'phone')if (!phoneReg.test(phone)) {alert(" 请输入有效的手机号码");return false;}//设置button效果，开始计时$("#btnSendCode1").attr("disabled", "true");$("#btnSendCode1").val(+ curCount1 + "秒再获取");InterValObj1 = window.setInterval(SetRemainTime1, 1000); //启动计时器，1秒执行一次//向后台发送处理数据}function SetRemainTime1() {if (curCount1 == 0) {window.clearInterval(InterValObj1);//停止计时器$("#btnSendCode1").removeAttr("disabled");//启用按钮$("#btnSendCode1").val("重新发送");}else {curCount1--;$("#btnSendCode1").val(+ curCount1 + "秒再获取");}}/*提交*/function binding() {alert(1)}</script></body></html>
