Mac修改阿里DNS/四川电信DNS

networksetup -listallnetworkservices //查看所有网络服务
networksetup -setdnsservers Wi-Fi 61.139.2.69 223.6.6.6 119.29.29.29 114.114.114.114 //设置成都电信、阿里、腾讯、114DNS
networksetup -getdnsservers Wi-Fi //查看DNS
dscacheutil -flushcache //刷新缓存