Ext.TabPanel中的items:
（来自项目源码中的items条目代码）
items:{
id:"opt1",
title:"默认页面",
tabTip:"这是默认页面，不可以关闭",
html:"这是默认页面哦！"
},,,,
items里面的这一组配置究竟是创建什么组件的配置项，在哪里有说明呢？英文原版api给出了说明。
If an xtype is not explicitly
specified, the defaultType for that Container is used.
这一句话的翻译是，如果xtype没有被明确的指出，Container的defaultType将被用作xtype的值；
Container的defaultType的默认值是panel。
items : Object/Array
** IMPORTANT: be sure to specify a layout if needed ! **
A single item, or an array of child Components to be added to this container,for example:
// specifying a single item
items: {...},
layout: ‘fit‘, // specify a layout!
// specifying multiple items
items: [{...}, {...}],
layout: ‘anchor‘, // specify a layout!Each item may be:
xtypextype is not explicitlyspecified, the
defaultType for that Container is used.Notes:
contentEl/html
with items.Class Ext.Container：
The default xtype of child Components to create in this Container whena child item is specified as a raw configuration object, rather than as an instantiated Component.
Defaults to ‘panel‘, except
Ext.menu.Menu which defaults to ‘menuitem‘,and
Ext.Toolbar and
Ext.ButtonGroup which default to ‘button‘
Ext.TabPanel中的items详解,布布扣,bubuko.com
原文：http://blog.csdn.net/qq1623267754/article/details/25924299