1. 通过网上的安装方法安装mongodb，然后执行brew update,后执行brew install mongodb；此时报错：

   Error: You must `brew link makedepend` before mongodb can be installed
   

2.直接搜索出来mongodb的shell时，报以下错误：

MongoDB shell version v3.4.2
connecting to: mongodb://127.0.0.1:27017
2017-04-18T18:51:28.415+0800 W NETWORK  [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: Connection refused
2017-04-18T18:51:28.417+0800 E QUERY    [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:237:13
@(connect):1:6
exception: connect failed
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.
Deleting expired sessions...148 completed.

3.请问各位大佬们，我应该怎样给卸载干净了然后重装呢？或者我以上的问题可以在不卸载的情况下应该怎么解决啊？大佬们有更好的安装的教程嘛？电脑是Mac系统，求链接，求指导~~~小妹感激不尽