老师，这个地方我用jquery validate验证的时候，确认密码的文本框不能进行验证

<!DOCTYPE html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>注册界面</title>
   <%
      String nameRepeat = request.getParameter("nameRepeat");
   %>
   <script type="text/javascript" src="js/jquery-3.4.1.js"></script>
   <script type="text/javascript" src="js/jquery.validate.js"></script>
   <script>
      //文本框验证代码
      $().ready(function () {
         $("#commentForm").validate({
            rules:{
               username:{
                  required:true,
                  checkUserName:true
               },
               password:{
                  required:true,
                  checkPassWord:true
               },
               confirm_password:{
                  required:true,
                  equalTo:"#password"
               },
               phone:{
                  required:true,
                  checkPhone:true
               },
               email:{
                  required:true
               }
            },
            messages:{
               username:{
                  required:"请输入用户名！"
               },
               password:{
                  required:"请输入密码！"
               },
               confirm_password:{
                  required:"请再次输入密码！",
                  equalTo:"两次密码输入不一致！"
               },
               phone:{
                  required:"请输入手机号！"
               },
               email:"请输入一个正确的邮箱！"
            }
         })
      });
      //正则表达式验证代码
      //用户名验证
      $.validator.addMethod("checkUserName",function (value,element,params) {
         var checkUserName = /^\w{3,13}$/g;
         return this.optional(element)||(checkUserName.test(value));
      },"请输入正确的用户名！");
      //密码验证
      $.validator.addMethod("checkPassWord",function (value,element,params) {
         var checkPassWord = /^[0-9]{6,12}$/;
         return this.optional(element)||(checkPassWord.test(value));
      },"请输入正确的密码！");
      //手机号验证
      $.validator.addMethod("checkPhone",function (value,element,params) {
         var checkUserName = /^[1][3578][0-9]{9}$/;
         return this.optional(element)||(checkUserName.test(value));
      },"请输入正确的手机号码！");


      var nameRepeat = "<%=nameRepeat%>";
      if(nameRepeat === "1"){
         alert("您输入的用户名已经被注册，请重新输入！");
      }
   </script>
   <style>
      .error{
         color: red;
      }
   </style>
</head>
<body>
   <center>
      <h1>用户注册</h1>
      <form action="/BookSystem/RegistServlet" method="post" id="commentForm">
         <table width="600px" cellspacing="0px" cellpadding="0px" border="1px">
            <tr>
               <td>用户名</td>
               <td><input type="text" name="username" placeholder="用户名为3-12位字母数字或下划线组合" id="username" style="width: 300px;" ></td>
            </tr>
            <tr>
               <td>密&nbsp;码</td>
               <td><input type="password" name="password" placeholder="密码长度为6-12位的纯数字"  id="password" style="width: 300px;" ></td>
            </tr>
            <tr>
               <td>确认密码</td>
               <td><input type="password" name="checkPWD" placeholder="密码长度为6-12位的纯数字" id="confirm_password" style="width: 300px;" ></td>
            </tr>
            <tr>
               <td>手机号码</td>
               <td><input type="text" name="phone" placeholder="请输入正确的手机号码格式" id="phone" style="width: 300px;"></td>
            </tr>
            <tr>
               <td>邮箱</td>
               <td><input type="email" name="email" placeholder="请输入正确邮箱格式" id="email" style="width: 300px;"></td>
            </tr>
            <tr>
               <td colspan="2" style="text-align:center">
                  <input type="submit" value="注册" id="submit">
                  <input type="reset" value="重置">
               </td>
            </tr>
         </table>
      </form>
   </center>
   <script type="text/javascript">
      var main1 = $("#password");
      var main2 = $("#confirm_password");
      //给确认密码输入框添加一个失去焦点时的事件：判断密码和确认密码输入框中的字符串是否一致；若不一致，则弹出提示框
      main2.blur(function(){
         var pw1 = main1.val();
         var pw2 = main2.val();
         if (pw1 !== pw2){
            alert("两次输入的密码不一致，请重新输入！");
         }
      });
   </script>
</body>
</html>