项目原始demo，不改动

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duplexer

Creates a duplex stream

duplex (writeStream, readStream)

Takes a writable stream and a readable stream and makes them appear as a readable writable stream.

It is assumed that the two streams are connected to each other in some way.

var grep = cp.exec('grep Stream')

duplex(grep.stdin, grep.stdout)

npm install duplexer

npm test