关于extjs web开发，界面布局问题，求大神详细的解释一下该怎么布局，不胜感激

table布局而已

    var panel = Ext.create('Ext.Panel', {
        id: 'main-panel',
        frame: true,
        renderTo: Ext.getBody(),
        defaults: { frame: true, width: 200, height: 200 },
        layout: {
            type: 'table',
            columns: 3
        },
        items: [{ title: 'row1-1', rowspan: 2, height: 410 }, { title: 'row1-2' }, { title: 'row1-3' }, { title: 'row2-1' }, { title: 'row2-2' }]
    });