Now I am writing ionic app. I have upgraded OS X and XCode to newer.
In previous versions, I had debug the ionic app by using safari inspector. But in the new version(Safari Version 8.0.5 (10600.5.17), XCode Version 6.3.1 (6D1002)), I can not debug my app by using Safari Inspector.
Safari seems to work instability sometimes. After this question, I got above problem several times. At that times, I did restart my mac, then, Safari return to normal working and I could debug via Safari.