jquery validate 使用示例

var el = {
    $jsFrom: $('.js-form'),
    };

 // 检测用户名是否存在
    jQuery.validator.addMethod("isexist", function(value, element) {
        var url=contentPath+"/sysUser/testSysUserExist";
        var param={};
        var result = false;
        param.userName = value;
        param.type=3;
        $.ajax({
            url: url,//查询方法的url
            data: param, // params
            type: "post",
            dataType: "json",
            async: false,
            success: function (data) {
                if(data.data.exist){
                    //该用户已存在
                    result =  true;
                }
            },
            error: function () {
                tools.openST({
                    title: '注意',
                    text: '验证用户名失败，请稍后刷新后重试',
                    type: 'fail'
                });
            }
        });
        return result;
    }, '用户不存在，请重新填写.');

    var validator = {
            validator: null,
            valid: function () {
                return this.validator.form();
            },
            reset: function () {
                this.validator.resetForm();
            },
            init: function () {
                var varlidator = el.$jsFrom.validate({
                    ignore: [],//加上这句话之后，这个验证方法就可以验证表单的隐藏域了，而且不用修改插件代码
                    rules: {
                        'account': {
                            required: true,
                            isexist:true
                        },
                        'code': {
                            required: true,
                            digits: true,
                            rangelength: [6]
                        },
                        'password': {
                            required: true,
                            minlength: 6,
                            maxlength: 20
                        },
                        'confirmPassword': {
                            required: true,
                            minlength: 6,
                            maxlength: 20,
                            equalTo : '#password'
                        }
                    },
                    messages: {
                        'account': {
                            required: '请输入您的账号'
                        },
                        'code': {
                            required: '请填写验证码',
                            digits: '验证码为纯数字',
                            rangelength: '验证码为 6 位数字'
                        },
                        'password': {
                            required: '请输入密码',
                            minlength: "不能小于6个字符",
                            maxlength: "不能大于20个字符"
                        },
                        'confirmPassword': {
                            required: '请再次输入密码',
                            minlength: "不能小于6个字符",
                            maxlength: "不能大于20个字符",
                            equalTo: '您输入的密码不一致'
                        }
                    },
                    errorClass: 'text-warning',
                    errorPlacement: function (error, element) {
                        element.closest('div').append(error);
                    }
                });
                this.validator = varlidator;
            }
        };

    validator.init();

            if (!validator.validator.element( "#account" )) {
                    tools.openST({
                        title: tools.message.validFail.title,
                        text: '请先填写账户名',
                        type: tools.message.validFail.type
                    });
                    return;
                }        

             if (!validator.valid()) {
                    tools.openST({
                        title: tools.message.validFail.title,
                        text: tools.message.validFail.text,
                        type: tools.message.validFail.type
                    });
                    return;
                }