JS实现短信倒计时及姓名、身份证、手机号正则验证

<div class="login">
        <form action="" method="post">
          <div class="login-box">
            <p class="pho-0 pho">
              <img class="" src="img/icon_002.png">
              <input type="number" placeholder="请输入手机号" class="phnum font15" />
            </p>
            <p class="pho-0">
              <img src="img/icon_001.png">
              <input type="number" placeholder="请输入验证码" class="psd font15 yzm" /><span class="famsg font14" id="famsg">点击获取</span>
            </p>
          </div>
          <input type="submit" value="立即注册" class="sbm font15" />
        </form>
        <h3 class="tel font16 ">客服电话：<a class="telpho" href="tel:400-0268-8888" rel="external nofollow" >400-0268-8888</a></h3>
      </div>

$(function() {
        var phone_num = /^1\d{10}$/;
        var flag = 1; //短信发送时标志位
        $("#famsg").click(function() {
          if($(".phnum").val() == "") {
            alert("请输入电话号码！");
            return false;
          };
          if(!phone_num.test($(".phnum").val().trim())) {
            alert("电话号码有误,请输入11位手机号！");
            return false;
          };
          if(flag == 1) {
            var i = 59;
            flag = 0;
            var n = setInterval(function() {
              var j = i + 's';
              $('#famsg').html(j);
              i--;
              if(i < -1) {
                clearInterval(n);
                flag = 1;
                $('#famsg').html('重新获取').prop("disabled", false);
              }
            }, 1000);
          }
        })
      });

 var regName =/^[\u4e00-\u9fa5]{2,4}$/;
 if(!regName.test(name)){
   alert('真实姓名填写有误');
   return false;
 }

 var regIdNo = /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;
 if(!regIdNo.test(idNo)){
   alert('身份证号填写有误');
   return false;
 }

 var mobileRegex = /^(((1[3456789][0-9]{1})|(15[0-9]{1}))+\d{8})$/;
   if(mobileRegex.test(phone)){
       alert('手机号正确');
   }else{
       alert('手机号输入不正确');
   }