Ext.TabPanel中的items具体解释

Ext.TabPanel中的items:

（来自项目源代码中的items条目代码）

items:{
id:"opt1",
title:"默认页面",
tabTip:"这是默认页面，不能够关闭",
html:"这是默认页面哦！

"
},,,,

items里面的这一组配置到底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。假设xtype没有被明白的指出，Container的defaultType将被用作xtype的值；

Container的defaultType的默认值是panel。

也就是说TabPanel中的items的值假设没有指定xtype，则默认的就是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:

• any type of object based on Ext.Component
• a fully instanciated object or
• an object literal that:
  • has a specified xtype
  • the Ext.Component.xtype specified is associated with the Componentdesired and should be chosen from one of the available xtypes as listedin Ext.Component.
  • If an xtype is not explicitlyspecified, the defaultType for that Container is used.
  • will be "lazily instanciated", avoiding the overhead of constructing a fullyinstanciated Component object

Notes:

• Ext uses lazy rendering. Child Components will only be renderedshould it become necessary. Items are automatically laid out when they are firstshown (no sizing is done while hidden), or in response to a doLayout call.
• Do not specify contentEl/html with items.

Class Ext.Container：

defaultType : String

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'