extjs实现左侧tab

layout = new Ext.BorderLayout(document.body, ...{

                            center: ...{
                                titlebar: false,
                                tabPosition: 'left'
                            }

                        });

                        layout.beginUpdate();
                        
                        var iframe = Ext.DomHelper.append( document.body, 
                            ...{tag: 'iframe', frameBorder: 0, src: 'BusiLineView.html' });
            
                        layout.add( 'center', new Ext.ContentPanel( iframe, ...{title: '公司', fitToFrame:true, closable: false}));
                        layout.add('center', new Ext.ContentPanel('panel-bk', ...{title: '板块', closable: false}));
                        layout.add('center', new Ext.ContentPanel('panel-fund', ...{title: '基金', closable: false}));
                        layout.getRegion('center').showPanel(0);
                        layout.endUpdate();