How to use the ykdl.util.jsengine.JSEngine function in ykdl

def init_jsengine():
    global js_ctx
    if js_ctx is None:
        from ykdl.util.jsengine import JSEngine
        assert JSEngine, "No JS Interpreter found, can't use cmd5x!"
        js_ctx = JSEngine()

        from pkgutil import get_data
        # code from https://zsaim.github.io/2019/08/23/Iqiyi-cmd5x-Analysis/
        try:
            # try load local .js file first
            js = get_data(__name__, 'cmd5x.js')
        except IOError:
            # origin https://raw.githubusercontent.com/ZSAIm/ZSAIm.github.io/master/misc/2019-08-23/iqiyi_cmd5x.js
            js = get_content('https://raw.githubusercontent.com/zhangn1985/ykdl/master/ykdl/extractors/iqiyi/cmd5x.js')
        js_ctx.append(js)

        # code from https://github.com/lldy/js
        try:
            # try load local .js file first
            js = get_data(__name__, 'cmd5x_iqiyi3.js')
        except IOError:

def init_jsengine():
    global js_ctx
    if js_ctx is None:
        from ykdl.util.jsengine import JSEngine
        assert JSEngine, "No JS Interpreter found, can't use cmd5x!"
        js_ctx = JSEngine()

        from pkgutil import get_data
        # code from https://zsaim.github.io/2019/08/23/Iqiyi-cmd5x-Analysis/
        try:
            # try load local .js file first
            js = get_data(__name__, 'cmd5x.js')
        except IOError:
            # origin https://raw.githubusercontent.com/ZSAIm/ZSAIm.github.io/master/misc/2019-08-23/iqiyi_cmd5x.js
            js = get_content('https://raw.githubusercontent.com/zhangn1985/ykdl/master/ykdl/extractors/iqiyi/cmd5x.js')
        js_ctx.append(js)

        # code from https://github.com/lldy/js
        try:
            # try load local .js file first
            js = get_data(__name__, 'cmd5x_iqiyi3.js')