实现可写流

¥Implementing a writable stream

stream.Writable 类被扩展以实现 Writable 流。

¥The stream.Writable class is extended to implement a Writable stream.

自定义 Writable 流必须调用 new stream.Writable([options]) 构造函数并实现 writable._write() 和/或 writable._writev() 方法。

¥Custom Writable streams must call the new stream.Writable([options]) constructor and implement the writable._write() and/or writable._writev() method.