mongodb版本3.2，node安装的mongodb驱动模块版本为1.4.15，顺便问一句Failed to load c++ bson extension, using pure JS version，这个安了bson、node-gyp毫无效果= =
C:\Users\Administrator\blog>node app.js
Failed to load c++ bson extension, using pure JS version
Express server listening on port 3000
C:\Users\Administrator\blog\node_modules\connect-mongo\lib\connect-mongo.js:178
throw err;
^
Error: Error connecting to database: failed to connect to [localhost:27017]
at null.<anonymous> (C:\Users\Administrator\blog\node_modules\connect-mongo\
node_modules\mongodb\lib\mongodb\connection\server.js:553:25)
at emitThree (events.js:97:13)
at emit (events.js:175:7)
at null.<anonymous> (C:\Users\Administrator\blog\node_modules\connect-mongo\
node_modules\mongodb\lib\mongodb\connection\connection_pool.js:140:15)
at emitTwo (events.js:87:13)
at emit (events.js:172:7)
at Socket.<anonymous> (C:\Users\Administrator\blog\node_modules\connect-mong
o\node_modules\mongodb\lib\mongodb\connection\connection.js:512:10)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at emitErrorNT (net.js:1250:8)
搞定了，这个bug可以分两个部分来看，Failed to load c++ bson extension, using pure JS version，这部分需要npm install node-gyp -g 有时死活下不下来有时分分钟下好了；
接着你需要开启mongodb数据库,命令行路径开到mongodb的bin下面
手动设置你要的项目数据库路径 mongod.exe --dbpath c:datablog
然后在项目的package.json里面
把这几个版本安装成最新的，不然还是会报错
再启动大功告成啦~~~