根据上面所学的CSS基础语法知识，现在来实现字段的解析。首先还是解析标题。打开网页开发者工具，找到标题所对应的源代码。

发现是在div class="entry-header"下面的h1节点中，于是打开scrapy shell 进行调试

但是我不想要<h1>这种标签该咋办，这时候就要使用CSS选择器中的伪类方法。如下所示。

注意的是两个冒号。使用CSS选择器真的很方便。同理我用CSS实现字段解析。代码如下

# -*- coding: utf-8 -*-  import scrapy  import re  class JobboleSpider(scrapy.Spider):      name = "jobbole"      allowed_domains = ["blog.jobbole.com"]      start_urls = ["http://blog.jobbole.com/113549/"]      def parse(self, response):          # title = response.xpath("//div[@class = "entry-header"]/h1/text()").extract()[0]          # create_date = response.xpath("//p[@class = "entry-meta-hide-on-mobile"]/text()").extract()[0].strip().replace("·","").strip()          # praise_numbers = response.xpath("//span[contains(@class,"vote-post-up")]/h10/text()").extract()[0]          # fav_nums = response.xpath("//span[contains(@class,"bookmark-btn")]/text()").extract()[0]          # match_re = re.match(".*?(d+).*",fav_nums)          # if match_re:          #     fav_nums = match_re.group(1)          # comment_nums = response.xpath("//a[@href="#article-comment"]/span").extract()[0]          # match_re = re.match(".*?(d+).*", comment_nums)          # if match_re:          #     comment_nums = match_re.group(1)          # content = response.xpath("//div[@class="entry"]").extract()[0]  #通过CSS选择器提取字段          title = response.css(".entry-header h1::text").extract()[0]          create_date = response.css(".entry-meta-hide-on-mobile::text").extract()[0].strip().replace("·","").strip()          praise_numbers = response.css(".vote-post-up h10::text").extract()[0]          fav_nums = response.css("span.bookmark-btn::text").extract()[0]          match_re = re.match(".*?(d+).*", fav_nums)          if match_re:              fav_nums = match_re.group(1)          comment_nums = response.css("a[href="#article-comment"] span::text").extract()[0]          match_re = re.match(".*?(d+).*", comment_nums)          if match_re:              comment_nums = match_re.group(1)          content = response.css("div.entry").extract()[0]          tags = response.css("p.entry-meta-hide-on-mobile a::text").extract()[0]          pass  

总结

以上所述是小编给大家介绍的CSS选择器实现字段解析，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网页设计网站的支持！