upload()用node.js
stream.PassThrough()流包装S3 函数。
这是一个例子：
inputStream .pipe(uploadFromStream(s3));function uploadFromStream(s3) { var pass = new stream.PassThrough(); var params = {Bucket: BUCKET, Key: KEY, Body: pass}; s3.upload(params, function(err, data) { console.log(err, data); }); return pass;}
