def upvoters(self):
        """获取文章的点赞用户

        :return: 文章的点赞用户，返回生成器。
        """
        from .author import Author, ANONYMOUS
        self._make_soup()
        headers = dict(Default_Header)
        headers['Host'] = 'zhuanlan.zhihu.com'
        json = self._session.get(
            Post_Get_Upvoter.format(self.slug),
            headers=headers
        ).json()
        for au in json:
            try:
                yield Author(
                        au['profileUrl'],
                        au['name'],
                        au['bio'],
                        photo_url=au['avatar']['template'].format(
                                id=au['avatar']['id'], size='r'),
                        session=self._session
                )
            except ValueError:  # invalid url
                yield ANONYMOUS
获取文章的点赞用户

        :return: 文章的点赞用户，返回生成器。