Extjs4，页面内增加快捷键

[javascript]代码库

        var el = Ext.getBody();
        function fn1() {
            Ext.Msg.alert("提示", "按下了ctrl+1键");
        }
        el.addKeyMap({ key: "1", ctrl: true, fn: fn1, scope: el });


实际getBody无参数时返回自己这个element.
https://blog.csdn.net/tctc_2/article/details/7603668