文章Model:
Post.getOneById = function(_id, callback) { ... db.collection('posts', function(err, collection){ collection.findOne({"_id": new ObjectID(_id)},function(err, doc){ .... } } }
路由:
app.get('/p/:_id', function(req, res){ Post.getOneById( req.params._id, function(err, post){ ... } }
好像这句有问题 {"_id": new ObjectID(_id)}