Inject javascript on Device Ionic 2

Hi guy. I have a file javascript. In it have some function of jquery. I inject it to file index.html and run successfully in brower. But when build on Android device it not run. Please help me!

Describe what you are actually trying to achieve. There is probably an idiomatic way to do it using Angular that does not need jQuery or putting any other random junk into index.html.

Because i want to use MathJax in project. It run on brower but not device. I guess
it can not load libs MathJax so try inject other file javascript to test.

I would suggest searching the web for information on how to use MathJax with Angular 2. Whatever you find will likely be applicable to Ionic.