我有以下代码gridfs.js具有以下写入文件字节的代码exports.putFile=function(path,name,options,fn){vardb;db=mongoose.connection.db;options=parse(options);options.metadata.filename=name;returnnewGridStore(db,name,"w",options).open(function(err,file){if(err){returnfn(err);}returnfile.writeFile(path,fn);});};Mongoose模式定义如

我有以下代码gridfs.js具有以下写入文件字节的代码exports.putFile=function(path,name,options,fn){vardb;db=mongoose.connection.db;options=parse(options);options.metadata.filename=name;returnnewGridStore(db,name,"w",options).open(function(err,file){if(err){returnfn(err);}returnfile.writeFile(path,fn);});};Mongoose模式定义如