The local server has been opened and can be accessed by the browser. The local access http request is also enabled in xcode.
It has been restarted, the code has been deleted and reinstalled. Only the offline mode of the bundle can run.
滿天的星座2017-05-02 09:25:00
When you are sure that the server is open and there are no other errors, press command+R in the emulator and it should be fine