? -> About This Mac -> System Report... -> Wi-Fi
可以看到支持信息：
Supported PHY Modes: 802.11 a/b/g/n/ac
Supported Channels: 1,2,3,4,5,6,7,8,9,10,11,12,13,36,40,44,48,52,56,60,64,149,153,157,161,165以及当前的网络的信息：
Current Network Information:
xcf_5GHz:
PHY Mode: 802.11n
...
Other Local Wi-Fi Networks:
HP-Print-60-LaserJet 300:
PHY Mode: 802.11g
...