方式1
nohup /Applications/WeChat.app/Contents/MacOS/WeChat > /dev/null 2>&1
方式2
open -n /Applications/WeChat.app/Contents/MacOS/WeChat
nohup /Applications/WeChat.app/Contents/MacOS/WeChat > /dev/null 2>&1
open -n /Applications/WeChat.app/Contents/MacOS/WeChat