解决MAC上启动mongod报错exiting with code 1的问题

今天启动mongod数据库时遇到问题：[js] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused :真实原因：解决方法：4.data目录下建db文件夹，给用户该文件夹的权限：5.在终端执行mongod启动成功。