Refactor js class

[github-actions[bot]]

Test262 conformance changes:

Test result	Dev count	PR count	Difference
Total	79,437	79,437	0
Passed	17,513	17,514	+1
Ignored	24,388	24,388	0
Failed	37,492	37,491	-1
Panics	44	44	0
Conformance	22.05	22.05	+0.00%

Base Failed But New Passed

``` 1. [non-strict] test262/test/built-ins/Object/create/15.2.3.5-4-39.js 2. [non-strict] test262/test/built-ins/Object/defineProperties/15.2.3.7-6-a-93-3.js 3. [strict] test262/test/built-ins/Object/defineProperties/15.2.3.7-6-a-93-3.js ```

New Failed But Base Passed

``` 1. [non-strict] test262/test/built-ins/Object/keys/15.2.3.14-2-8.js 2. [strict] test262/test/built-ins/Object/keys/15.2.3.14-4-1.js ```