Writing and programming of the eastern calculator

HTTPS://myros-code.github.io/EastCalc-test-/
In this order I have developed two unique calculators.

Why two? The customer thought about the design of the first calculator, and asked me to make another, with a slightly different functionality.
What is the complexity? by {
There were no big problems. But the first complexities arose with the composition of the code algorithm, as some properties of the calculator do not have accurate calculated formulas.
and the
Implementation {
It’s all written on a clean JavaScript, and the line goes without any personal tools. The adapter is present.
and the