可参考这里：https://forums.developer.apple.com/thread/67110
goldsdad
Nov 11, 2016 3:00 PM
(in response to gilan)
Have you tried simply relaunching Safari after Simulator starts running?
I find that Simulator is always in Safari's Develop menu if it's already running when Safari launches, and Simulator is never in the menu if Safari is launched first. That's Simulator 10.0 (comes with Xcode 8.1), Safari 10.0.1 and OS X 10.11.6.
先运行模拟器，再打开Safari 即可。
记录，以供查询。
