尝试在没有submit()按钮的情况下添加jQuery验证

<script src="https://cdn.jsdelivr.net/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/jquery.validation/1.16.0/jquery.validate.min.js"></script>

<form id="myForm">
  <input type="text" name="username" class="required" placeholder="用户名">
  <input type="text" name="email" class="required email" placeholder="邮箱">
  <input type="password" name="password" class="required" placeholder="密码">
  <input type="password" name="confirm_password" class="required" placeholder="确认密码">
  <input type="submit" value="提交">
</form>

$(document).ready(function(){
  $('#myForm').validate({
    rules: {
      username: 'required',
      email: {
        required: true,
        email: true
      },
      password: 'required',
      confirm_password: {
        required: true,
        equalTo: '#myForm input[name="password"]'
      }
    },
    messages: {
      username: '请输入用户名',
      email: {
        required: '请输入邮箱',
        email: '请输入有效的邮箱地址'
      },
      password: '请输入密码',
      confirm_password: {
        required: '请确认密码',
        equalTo: '两次输入的密码不一致'
      }
    }
  });
});

$('#myForm').submit(function(e){
  e.preventDefault(); // 阻止表单默认提交行为
  if ($(this).valid()) {
    // 验证通过，执行相应的操作
    // 可以在这里使用AJAX提交表单数据等
  }
});