Pac文件可以从switchSharp中导出
Configuring Safari manually
Getting Started Guide | Cloud Web Protection Solutions
In Safari, go to Safari > Preferences.
Click on the Advanced icon.
Under Proxies, click Change Settings.
Under Select a protocol to configure, select Automatic Proxy Configuration.
In the Proxy Configuration File URL field, enter the path to the PAC file (See The TRITON AP-WEB PAC file).
Click Apply.
Close and restart Safari.
注意！在10.8之后的Mac使用了沙盒策略 Safari不能使用本地的pac文件
所以可以将pac传到github上 再点开raw 用那个raw的地址填写再那个URL框中