@property<EOL><INDENT>@check_soup('<STR_LIT>')<EOL>def collection_num(self):<DEDENT>
if self.url is None:<EOL><INDENT>return <NUM_LIT:0><EOL><DEDENT>else:<EOL><INDENT>return int(self._nav_list[<NUM_LIT:4>].span.text)<EOL><DEDENT>
获取收藏夹数量.

        :return: 收藏夹数量
        :rtype: int