How do I write code to have ionic3 call the js function?

I have a function in all.js that drawA (), now needs to call in the component/st of the ionic3 project to draw.
has tried several scenarios on google and failed to solve this problem.
find a feasible solution.

Mar.02,2021

find a feasible solution in stackoverflow through the ionic3 forum. For more information, please see
https://stackoverflow.com/que.

.
Menu