尝试使用路由从MongoDB下载图像文件:router.get('/:id',function(req,res){gfs.findOne({_id:mongoose.Types.ObjectId(req.params.id)},function(err,file){if(err){common.handleError(err,res);return;}if(!file){returnres.json({status:constants._ERROR,body:{message:constants._FILE_NOT_FOUND}});}res.set('Content-Type',fi