stream.isReadable(stream)
稳定性： 1 - 实验性
stream<Readable> | <Duplex> | <ReadableStream>- 返回：<boolean>
返回流是否可读。
🌐 Returns whether the stream is readable.
stream <Readable> | <Duplex> | <ReadableStream>返回流是否可读。
🌐 Returns whether the stream is readable.