def show(self,response):

        # print(response.url)

        title = response.xpath('//main/div/div/div/div/h1/text()').extract()

        print(title)

        shijian_time = datetime.strptime(''.join(response.xpath('//main/div/div/div/div/div/span[1]/text()').extract()),'%Y年%m月%d日 %H:%M:%S').strftime('%Y/%m/%d %H:%M:%S')

        print(shijian_time)#时间格转换，先转换成字符串，在转换成时间格式