https://www.jianshu.com/p/308fb22a7dab
输入命令ifconfig -a 找：
pi@raspberrypi:~ $ sudo nano /etc/network/interfaces iface wlan0 inet static # eth0是有线 address 192.168.1.202 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 114.114.114.114
