为jQuery验证插件添加规则

jQuery.validator.addMethod("emailEndsWithCom", function(value, element) {
  return this.optional(element) || value.endsWith(".com");
}, "电子邮件地址必须以.com结尾");

<form id="myForm">
 <label for="email">电子邮件：</label>
 <input type="email" id="email" name="email" required>
 <button type="submit">提交</button>
</form><script>
  $("#myForm").validate({
    rules: {
      email: {
        required: true,
        emailEndsWithCom: true
      }
    }
  });
</script>