$(document).ready(function(){
    var response;
    $.validator.addMethod(
        "uniqueUserName", 
        function(value, element) {
            $.ajax({
                type: "POST",
                url: "http://"+location.host+"/checkUser.php",
                data: "checkUsername="+value,
                dataType:"html",
                success: function(msg)
                {
                    //If username exists, set response to true
                    response = ( msg == 'true' ) ? true : false;
                }
             });
            return response;
        },
        "Username is Already Taken"
    );

    $("#regFormPart1").validate({
        username: {
            required: true,
            minlength: 8,
            uniqueUserName: true
        },
        messages: {
            username: {
                required: "Username is required",
                minlength: "Username must be at least 8 characters",
                uniqueUserName: "This Username is taken already"
            }
        }
    });
});

步骤1包含cdn like

     <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

     <script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>

2 .编码

  $(document).ready(function(){
        $("#submit").click(function () {
              $('#myform').validate({ // initialize the plugin
                rules: {
                    id: {
                        required: true,
                        email: true
                    },
                    password: {
                        required: true,
                        minlength: 1
                    }
                },
                messages: {
                    id: {
                        required: "Enter Email Id"

                    },
                    password: {
                        required: "Enter Email Password"

                    }
                },
                submitHandler: function (form) { // for demo
                    alert('valid form submitted'); // for demo
                    return false; // for demo
                }
            });
       }):
  }); 

自定义规则和数据属性

您可以创建一个自定义规则，并使用data属性将其附加到元素上，使用语法data-rule-rulename="true";

因此，要检查一组复选框中是否至少有一个被选中:

data-rule-oneormorechecked

<input type="checkbox" name="colours[]" value="red" data-rule-oneormorechecked="true" />

调用addMethod

$.validator.addMethod("oneormorechecked", function(value, element) {
   return $('input[name="' + element.name + '"]:checked').length > 0;
}, "Atleast 1 must be selected");

你也可以通过使用语法data-msg-rulename="my new message"来覆盖规则的消息(即:必须选择至少1个)。

NOTE

如果使用data-rule-rulename方法，则需要确保规则名全部为小写。这是因为jQuery验证函数dataRules应用. tolowercase()进行比较，而HTML5规范不允许大写。

工作示例

$.validator.addMethod("oneormorechecked", function(value, element) { return $('input[name="' + element.name + '"]:checked').length > 0; }, "Atleast 1 must be selected"); $('.validate').validate(); <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.14.0/jquery.validate.min.js"></script> <form class="validate"> red<input type="checkbox" name="colours[]" value="red" data-rule-oneormorechecked="true" data-msg-oneormorechecked="Check one or more!" /><br/> blue<input type="checkbox" name="colours[]" value="blue" /><br/> green<input type="checkbox" name="colours[]" value="green" /><br/> <input type="submit" value="submit"/> </form>

谢谢，成功了!

这是最终的代码:

$.validator.addMethod("greaterThanZero", function(value, element) {
    var the_list_array = $("#some_form .super_item:checked");
    return the_list_array.length > 0;
}, "* Please check at least one check box");

你可以像这样添加一个自定义规则:

$.validator.addMethod(
    'booleanRequired',
    function (value, element, requiredValue) {
        return value === requiredValue;
    },
    'Please check your input.'
);

并将其添加为如下规则:

PhoneToggle: {
    booleanRequired: 'on'
}        

// add a method. calls one built-in method, too.
jQuery.validator.addMethod("optdate", function(value, element) {
        return jQuery.validator.methods['date'].call(
            this,value,element
        )||value==("0000/00/00");
    }, "Please enter a valid date."
);

// connect it to a css class
jQuery.validator.addClassRules({
    optdate : { optdate : true }    
});