您必须通过将其输送到两个流中来创建流的副本。您可以使用PassThrough流创建简单流,只需将输入传递到输出即可。
const spawn = require('child_process').spawn;const PassThrough = require('stream').PassThrough;const a = spawn('echo', ['hi user']);const b = new PassThrough();const c = new PassThrough();a.stdout.pipe(b);a.stdout.pipe(c);let count = 0;b.on('data', function (chunk) { count += chunk.length;});b.on('end', function () { console.log(count); c.pipe(process.stdout);});
输出:
8hi user
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