提供详细过程（附代码），介绍如何实现扩展程序提供程序类。

Provides a detailed procedure with code to explain how to implement an extender provider class.

youdao

提供详细过程（附代码），介绍如何实现扩展程序提供程序类。

Provides a detailed procedure with code to explain how to implement an extender provider class.

youdao