stream.Transform 类

转换流是 Duplex 流，其中输出以某种方式与输入相关。 与所有 Duplex 流一样，Transform 流实现了 Readable 和 Writable 接口。

Transform 流的示例包括：

• 压缩流
• 加密流

Transform streams are Duplex streams where the output is in some way related to the input. Like all Duplex streams, Transform streams implement both the Readable and Writable interfaces.

Examples of Transform streams include:

• zlib streams
• crypto streams