sencha touch JsonP 自动提示消息 masked（废弃 仅参考）

查看Ext.data.JsonP源码重写了源码中的方法，以便能够加入自动提示。看起来不是那么的优雅，求高人指点

        var me = this;
        //提示消息
        me.message = '正在努力加载中...';
        //提示消息组件
        var cardPanel = Ext.getCmp('cardPanel');
        Ext.data.JsonP.handleResponse = function (result, request) {
            var success = true;

            if (request.timeout) {
                clearTimeout(request.timeout);
            }

            delete this[request.callbackName];
            delete this.requests[request.id];

            this.cleanupErrorHandling(request);
            Ext.fly(request.script).destroy();

            if (request.errorType) {
                success = false;
                Ext.callback(request.failure, request.scope, [request.errorType, request]);
            } else {
                Ext.callback(request.success, request.scope, [result, request]);
            }
            Ext.callback(request.callback, request.scope, [success, result, request.errorType, request]);
            //隐藏消息提示
            cardPanel.hideMessage();
        };

        Ext.data.JsonP.createScript = function (url, params, options) {
            //显示消息提示
            if (me.message) {
                cardPanel.showMessage(me.message, true);
            }
            var script = document.createElement('script');
            script.setAttribute("src", Ext.urlAppend(url, Ext.Object.toQueryString(params)));
            script.setAttribute("async", true);
            script.setAttribute("type", "text/javascript");
            return script;
        };