以下代码片段按预期工作:它读取已使用multer[https://github.com/expressjs/multer]上传的文件并将其流式传输到gridfs中。我也能够从gridfs中提取它。vartarget=gfs.createWriteStream({filename:fileItem.originalname,mode:'w',metadata:metaData});fs.createReadStream(tempFile).on('end',function(){console.log('Filereadandstored');}).on('error',function