process.stderr 属性返回连接到stderr(fd 2)的流。 它是一个net.Socket(它是一个Duplex流),除非 fd 2指向一个文件,在这种情况下它是一个[可写][]流。

注意: process.stderr 与其他 Node.js 流有重要的区别,详见 note on process I/O

The process.stderr property returns a stream connected to stderr (fd 2). It is a net.Socket (which is a Duplex stream) unless fd 2 refers to a file, in which case it is a Writable stream.

process.stderr differs from other Node.js streams in important ways, see note on process I/O for more information.