问NoneType对象没有属性'span‘

EN

def get_throttling_function_name(js: str) -> str:
"""Extract the name of the function that computes the throttling parameter.

:param str js:
    The contents of the base.js asset file.
:rtype: str
:returns:
    The name of the function used to compute the throttling parameter.
"""
function_patterns = [
    # https://github.com/ytdl-org/youtube-dl/issues/29326#issuecomment-865985377
    # a.C&&(b=a.get("n"))&&(b=Dea(b),a.set("n",b))}};
    # In above case, `Dea` is the relevant function name
    r'a\.[A-Z]&&\(b=a\.get\("n"\)\)&&\(b=([^(]+)\(b\)',
]
logger.debug('Finding throttling function name')
for pattern in function_patterns:
    regex = re.compile(pattern)
    function_match = regex.search(js)
    if function_match:
        logger.debug("finished regex search, matched: %s", pattern)
        function_name = function_match.group(1)
        is_Array = True if '[' or ']' in function_name else False
        if is_Array:
            index = int(re.findall(r'\d+', function_name)[0])
            name = function_name.split('[')[0]
            pattern = r"var %s=\[(.*?)\];" % name
            regex = re.compile(pattern)
            return regex.search(js).group(1).split(',')[index]
        else:
            return function_name

raise RegexMatchError(
    caller="get_throttling_function_name", pattern="multiple"
)