jquery请求封装,包含错误提示

因为项目没有使用框架所以自己封装了一个ajax请求，同时包含了错误提示。

// 声明一个全局Http请求
window.rydHttpServer = {
    /**
     * [httpServer 请求服务]
     * @param  {[type]} url    [请求路径]
     * @param  {[type]} params [请求参数]
     * @param  {[type]} setDom [load请求的数据]
     * @param  {[type]} methods [请求方式]
     * @return {[type]}        [返回结果]
     */
    httpServer: function(url, params ,setDom,methods) {
        if (params == undefined) { params = {}; }
        var deffer = $.Deferred();
        if (setDom&&methods == undefined) {
            $(setDom).load(url, $.param(params), function(response, status, xhr) {
                deffer.resolve(response, status, xhr);
            });
            return deffer.promise();
        } else {
            if (params == undefined) { params = {}; }
            if(methods){methods = "GET";}
            $.ajax({
                url: url, // 请求接口
                data: $.param(params),
                type: methods||'POST',
                cache: false,
                success: function(data) {
                    if(data.httpCode != undefined && data.httpCode != 200){
                        rydHttpServer.alert(data.msg,3);
                        deffer.reject(data);
                    }
                    deffer.resolve(data);
                },
                error: function(data) {
                    deffer.reject(data);
                    console.log("数据异常,信息如下:",data);
                }
            });
            return deffer.promise();
        }
    },
    alert:function(title,time,fun){
        if(time == undefined){time =3;}
        var tipWinObj = document.createElement("div");
            tipWinObj.id = 'window-alert';
            tipWinObj.style.cssText = "position:relative;z-index:9999;display: table; position: fixed;left: 0;top: 0;width: 100%;height: 100%;";
        var topContent = document.createElement("div");
            topContent.style.cssText = "display: table-cell;vertical-align: middle;text-align: center;";
        var topDiv = document.createElement("div");
            topDiv.style.cssText = "    width: auto;max-width: 90%;margin: 0px auto;bottom: -150px;background-color: rgba(0, 0, 0, 0.7);color: rgb(255, 255, 255);position: relative;display: inline-block;text-align: left;border-radius: 5px;box-shadow: 0 0 8px rgba(0,0,0,.1);pointer-events: auto;";
        var titDiv = document.createElement("div");
            titDiv.className = "tips-text";
            titDiv.style.cssText = "padding: 10px 20px;text-align: center;font-size: 0.36rem;";
            titDiv.innerHTML = title;
            topDiv.appendChild(titDiv);
            topContent.appendChild(topDiv);
            tipWinObj.appendChild(topContent);
            document.body.appendChild(tipWinObj);
            var currTime = setTimeout(function (argument) {
                document.body.removeChild(document.getElementById("window-alert"));
                clearTimeout(currTime);
                if(fun != undefined)fun();
            },1000*time);
    },
    /**
     * [getUrlParams 获取Url参数]
     * @param  {[type]} name [需要获取的参数名]
     * @return {[type]}      [description]
     */
    getUrlParams: function(name) {
        var url = decodeURI(location.href);
        var paraString = url.substring(url.indexOf("?") + 1, url.length).split("&");
        var paraObj = {};
        var j;
        for (j in paraString) {
            paraObj[paraString[j].substring(0, paraString[j].indexOf("=")).toLowerCase()] = paraString[j].substring(paraString[j].indexOf("=") + 1, paraString[j].length);
        }
        var returnValue = paraObj[name.toLowerCase()];
        if (typeof(returnValue) == "undefined") {
            return "";
        } else {
            return returnValue;
        }
    },
    /**
     * [open 页面跳转]
     * @param  {[type]} params [description]
     * @return {[type]}        [description]
     */
    open: function(url) {
        window.location.href=url;
    },
    /**
     * [setData 处理后台返回null问题]
     * @param {[type]} params [description]
     */
    removeNull: function(params) {
        if (params == undefined) return;
        if (params.constructor == Object) {
            Object.keys(params).forEach(function(obj) {
                if (params[obj] == null || undefined) {
                    params[obj] = "";
                }
            });
        }
        if (params.constructor == Array) {
            for(var i = 0; i< params.length;i++){
                Object.keys(params[i]).forEach(function(j) {
                if (params[i][j] == null || undefined) {
                    params[i][j] = "";
                }
                });
            }
        }
    },
    /**
     * [readCookie 获取cookie]
     * @param  {[type]} key [description]
     * @return {[type]}     [description]
     */
    readCookie:function(key) {
        var nameEQ = key + "=";
        var ca = document.cookie.split(';');
        for (var i = 0, max = ca.length; i < max; i++) {
            var c = ca[i];
            while (c.charAt(0) === ' ') {
                c = c.substring(1, c.length);
            }
            if (c.indexOf(nameEQ) === 0) {
                return c.substring(nameEQ.length, c.length);
            }
        }
        return "";
    }
};