1.首先在命令行敲下面的命令，用vim打开host文件；
WX20170731-224741@2x.png
2.打开后默认的就长这个样子；
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting. Do not change this entry.
##
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
3如何修改权限 shift+command+G 输入/private/etc/hosts
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4如何修改权限 打开右下角的🔒，修改为Read&write
QQ20170803-110818.png
在这里有一种修改host文件的方法，搭梯子去国外...有兴趣的私聊我
Mac检查端口是否占用
lsof -iTCP:80 | grep LISTEN If you are going to find the process listening on 80 port
sudo lsof -i -P | grep -i "listen" Mac下使用这个命令即可查看所有占用的端口
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