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很简单，查看ExtJs的API文档，找到TreePanel,然后找到contextmenu ，展开后，会看到如下内容，包括解释和例子！
contextmenu : ( Node node, Ext.EventObject e )
Fires when a node is right clicked. To display a context menu in response to this event, first create a Menu object (…
Fires when a node is right clicked. To display a context menu in response to this event, first create a Menu object (see Ext.menu.Menu for details), then add a handler for this event:

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