jquery.validate插件 - 如何在表单验证之前修剪值

<form id="myForm">
 <label for="username">用户名:</label>
 <input type="text" id="username" name="username" />
  <br />
 <label for="email">电子邮件:</label>
 <input type="text" id="email" name="email" />
  <br />
 <input type="submit" value="提交" />
</form>

$(document).ready(function () {
  $("#myForm").validate({
    rules: {
      username: {
        required: true,
        minlength: 3,
      },
      email: {
        required: true,
        email: true,
      },
    },
    messages: {
      username: {
        required: "请输入用户名",
        minlength: "用户名必须包含至少3个字符",
      },
      email: {
        required: "请输入电子邮件",
        email: "请输入有效的电子邮件",
      },
    },
    submitHandler: function (form) {
      // 在这里，可以将修剪后的值存储在变量中，然后将它们发送到服务器
      var trimmedUsername = $.trim($("#username").val());
      var trimmedEmail = $.trim($("#email").val());
      console.log("修剪后的用户名: " + trimmedUsername);
      console.log("修剪后的电子邮件: " + trimmedEmail);
      form.submit();
    },
  });
});