stream.Readable.isDisturbed(stream)
stream<stream.Readable> | <ReadableStream>- 返回值：
boolean
返回流是否已被读取或取消。
【Returns whether the stream has been read from or cancelled.】
stream <stream.Readable> | <ReadableStream>boolean返回流是否已被读取或取消。
【Returns whether the stream has been read from or cancelled.】