摘要： http://mongoosejs.com/docs/populate.htmlhttp://stackoverflow.com/questions/6578178/node-js-mongoose-js-string-to-objectid-function在mongoose里面使用引用对象（id，ref）http://api.mongodb.org/java/2.0/org/bson/types/ObjectId.htmlMongoDB中BSON.TYPES.OBJECTIDhttp://mongoosejs.com/docs/schematypes.htmlMongoose中的Schem 阅读全文