js异步加载服务端数据

customizeRbtServer={  
    httpURL: top.ucDomain+"/Support/ServiceAPI/",
    requestData:function(sid,fileName,callBack){
                var dataHref=customizeRbtServer.httpURL+fileName + "?sid="+sid;
            var scriptId="jsReuest";
            try{
            scriptId=fileName.split('.')[0];
            }catch(e){}
            Utils.requestByScript(scriptId, dataHref, callBack)
                }
        }
    
customizeRbtUI={
    GetCustomizeRbt:function(){
        customizeRbtServer.requestData(top.UserData.ssoSid,"Gettjmusic.ashx",customizeRbtUI.CheckCustomizeRbt);  
         
    },
    CheckCustomizeRbt:function(){         
         if(typeof(colorRing) =="undefined" || colorRing==null)
            return;
         if(colorRing["code"]=="S_OK")
         {
              showOrderRing(colorRing["customizeRbt"],"");
         }
         else
         {
            showOrderRing("","");
         }
         colorRing=null;
        }       
    }

/**
     * 添加script元素到dom中,常用来异步加载资源<br>
     * <pre>示例：<br>
     * <br>Utils.requestByScript(<br>
     * "loadAScript",<br>
     * "sample-requestByScript.js",<br>
     * function(){ 运行加载脚本文件的方法... });
     * </pre>
     * @param {string} scriptId script标签的id,该参数其实意义不大,可以无视。
     * @param {string} dataHref script标签的路径,即src属性。
     * @param {function} callback script onload后的回调函数。
     * @param {string} charset 标记的charset属性
     * @param {Object} retry 重试的次数,间隔,如{times:5,timeout:10000},如果没加载成功,则重试5次,每次间隔10秒(不建议使用)。
     * @return {无返回值}
     */
    requestByScript: function(scriptId, dataHref, callback, charset, retry)
    {
        var isReady = false;
        if (callback)
        {
            if (typeof (callback) == "string")
            {
                charset = callback;
                callback = null;
            }
        }
        var head = document.getElementsByTagName("head")[0];
        var objScript = document.getElementById(scriptId);
        if (objScript && !document.all)
        {
            objScript.src = "";
            objScript.parentNode.removeChild(objScript);
            objScript = null;
        }
        if (objScript != null)
        {
            if (dataHref.indexOf("?") == -1) dataHref += "?";
            dataHref += "&" + Math.random();
            objScript.src = dataHref;
            var dataScript = objScript;
        } else
        {
            var dataScript = document.createElement("script");
            dataScript.id = scriptId;
            if (charset)
            {
                dataScript.charset = charset;
            } else
            {
                dataScript.charset = "GB2312";
            }
            dataScript.src = dataHref;
            dataScript.defer = true;
            dataScript.type = "text/javascript";
            head.appendChild(dataScript);
        }
        if (document.all)
        {
            dataScript.onreadystatechange = function()
            {
                if (dataScript.readyState == "loaded" || dataScript.readyState == "complete")
                {
                    isReady = true;
                    if (callback) callback();
                }
            }
        } else
        {
            dataScript.onload = function()
            {
                isReady = true;
                if (callback) callback();
            }
        }

        if (retry)
        {
            setTimeout(function()
            {
                if (retry.times > 0 && !isReady)
                {
                    retry.times--;
                    if (dataHref.indexOf("?") == -1) dataHref += "?";
                    dataHref += "&" + Math.random();
                    Utils.requestByScript(scriptId, dataHref, callback, charset, retry);
                }
            }, retry.timeout);
        }
    }
}