items也引入了
obj_item = XiaohuaItem()
obj_item['name'] = name
obj_item['src'] = src
yield obj_item

     #settings文件   
    ITEM_PIPELINES = {

          'spider.pipelines.SpiderPipelineXH': 100
       }


   #piplines 文件
   from scrapy.pipelines.images import ImagesPipeline
   import scrapy
   class SpiderPipelineXH(ImagesPipeline):
ptinr('这里有输出')
def get_media_requests(self, item, info):
    print(item) #没有输出

    yield scrapy.Request(item['src'])

def item_completed(self, results, item, info):
    print(results)
    
    return item