rank=item.xpath(".//div[@class=’HotItem-index’]/div/text()")[0]
title=item.xpath(".//div[@class='HotItem-content']/a/@title")[0]
rot=item.xpath(".//div[@class='HotItem-metrics HotItem-metrics-bottom']/text()")[0]
rank=item.xpath(".//div[@class=’HotItem-index’]/div/text()")[0]
title=item.xpath(".//div[@class='HotItem-content']/a/@title")[0]
rot=item.xpath(".//div[@class='HotItem-metrics HotItem-metrics-bottom']/text()")[0]
rank=item.xpath(".//div[@class=’HotItem-index’]/div/text()")[0] #是用xpath选取item元素下class为HotItem-index的节点div的子节点div下的所有文本列表中第一个元素,其余两项类同。