scrapy pase调用自定义函数每次每次遍历得到的数据都是一样的，只有自定义中的数据是不一样的

def parse(self, response, *args):
    item = TuiqiuspiderproItem()
    resp = response.json()
    for article in resp['articles']:
        if compTime(article['published_at']) and article['channel'] != "mini_top" and article['is_video'] is False:
            item['publish_time'] = article['published_at']
            item['tag'] = resp['label']
            item['source_href'] = article['share']
            item['source'] = "——"
            data = scrapy.Request(url=article['share'], callback=self._article, meta={'item': item})
            data.meta['item'] = item
            yied data
def _article(self, response):
    item = response.meta['item']
    soup = BeautifulSoup(response.text, 'lxml')
    comments = soup.findAll(text=lambda text: isinstance(text, Comment))
    [comment.extract() for comment in comments]
    try:
            article = soup.find("div", {"class": "news-left"})
            tips = article.find('p', {"class": "tips"}).find_all('span')
            if tips and len(tips) > 1:
                item['author'] = tips[1].get_text()
            else:
                item['author'] = tips[0].get_text()
        except Exception as e:
            pass
        author = response.xpath('.//div[@class="news-left"]/p[@class="tips"]/span/text()').extract_first()
        item['author'] = author
        item['content'] = response.xpath('.//div[@class="con"]').extract_first()
        yield item

pase 中的item每次遍历都是一样的，只有_articel中的item是数据是一样的，怎么解决每次遍历返回的数据