Figure 11 shows an integration test client that has attached to a module with a component that was called twice.
图11显示了附加到模块的集成测试客户端，该模块中的组件已调用两次。
2
One of the key advantages of using plug-ins is that the plug-in can be used not only by the component it is attached to, but also by all subclasses derived from that component.
使用插件的一个主要优势是，插件不仅可以被附加的组件所使用，也可以被所有从该组件衍生的子类所使用。
3
A nice feature of using plug-ins in Ext JS is that multiple plug-ins can be attached to a single component, providing additional functionality as required.