extjs的Ext.define()函数的用法以及注意点。

译自：http://docs.sencha.com/extjs/4.2.3/#!/api/Ext

define( className,
data, [createdFn] ) : Ext.Base

Defines a class or override. A basic class is defined like this:

Ext.define('My.awesome.Class', {
someProperty: 'something',

someMethod: function(s) {
alert(s + this.someProperty);
}

...
});

var obj = new My.awesome.Class();

obj.someMethod('Say '); // alerts 'Say something'

Parameters

className : String

The class name to create in string dot-namespaced format, for example: 'My.very.awesome.Class', 'FeedViewer.plugin.CoolPager' It is highly recommended to follow this simple convention: - The root and the class name are 'CamelCased' - Everything else is lower-cased
Pass 

null

 to create an anonymous class.

data : Object

The key - value pairs of properties to apply to this class. Property names can be of any valid strings, except those in the reserved listed below: - 

mixins

 -

statics

 - 

config

 - 

alias

 - 

xtype

 (for Components only)
- 

self

 - 

singleton

 - 

alternateClassName

 - 

override

createdFn : Function (optional)

Callback to execute after the class is created, the execution scope of which (

this

) will be the newly
created class itself.

Returns

Ext.Base

注意：参数集中的data选项的key值（数据名）是有限制的，如下关键字不可用：

data : Object

The key - value pairs of properties to apply to this class. Property names can be of any valid strings, except those in the reserved listed below: - 

mixins

 -

statics

 - 

config

 - 

alias

 - 

xtype

 (for Components only)
- 

self

 - 

singleton

 - 

alternateClassName

 - 

override

即：

- mixins

 -

statics

 - 

config

 - 

alias

 - 

xtype

 (for Components only)
- 

self

 - 

singleton

 - 

alternateClassName

 - 

override

当然还包括其子类的属性和所有类的基类Ext.Base的所有属性，比如Ext.Base.extend
  即如extend：'Ext.tree.Panel',

这些关键字不可用，因为这些key值被赋予了特殊的意义，具体参考官网说明。