JS验证是不是为空,精简代码

JS验证是否为空,精简代码
以下是JS验证是否为空,请问能否精简代码?

        var NickName = $("#Eble_User_User_NickName"), // 昵称
    CompanyName = $("#Eble_User_User_CompanyName"), // 公司名称
    CompanyTel = $("#Eble_User_Ext_Uext_CompanyTel"), // 公司电话
    Contact = $("#Eble_User_User_Contact"), // 联系人
    CompanyDepartment = $("#Eble_User_Ext_Uext_CompanyDepartment"), // 部门
        CompanyPositions = $("#Eble_User_Ext_Uext_CompanyPositions"), // 职位
        ContactTel = $("#Eble_User_User_ContactTel"), // 电话
    ContactMobile = $("#Eble_User_User_ContactMobile"); // 手机
        var istrue = true;
        if (NickName.val()=="") {
            NickName.addClass("input-validation-error");
            istrue = false;
        }
        else {
            NickName.removeClass("input-validation-error");
        }
        if (CompanyName.val() == "") {
            CompanyName.addClass("input-validation-error");
            istrue = false;
        }
        else {
            CompanyName.removeClass("input-validation-error");
        }
        if (CompanyTel.val() == "") {
            CompanyTel.addClass("input-validation-error");
            istrue = false;
        }
        else {
            CompanyTel.removeClass("input-validation-error");
        }
        if (Contact.val() == "") {
            Contact.addClass("input-validation-error");
            istrue = false;
        }
        else {
            Contact.removeClass("input-validation-error");
        }
        if (CompanyDepartment.val() == "") {
            CompanyDepartment.addClass("input-validation-error");
            istrue = false;
        }
        else {
            CompanyDepartment.removeClass("input-validation-error");
        }
        if (CompanyPositions.val() == "") {
            CompanyPositions.addClass("input-validation-error");
            istrue = false;
        }
        else {
            CompanyPositions.removeClass("input-validation-error");
        }
        if (ContactTel.val() == "") {
            ContactTel.addClass("input-validation-error");
            istrue = false;
        }
        else {
            ContactTel.removeClass("input-validation-error");
        }
        if (ContactMobile.val() == "") {
            ContactMobile.addClass("input-validation-error");
            istrue = false;
        }
        else {
            ContactMobile.removeClass("input-validation-error");
        }

------解决思路----------------------
var istrue = true; 
$("#Eble_User_User_NickName,#Eble_User_User_CompanyName,#Eble_User_Ext_Uext_CompanyTel").removeClass('input-validation-error').each(function(){
if(!this.value)$(this).addClass('input-validation-error'),istrue = false;
})