模拟登陆存在问题

学习Python爬虫(七)--Scrapy模拟登录的post模拟登陆后，自己写了模拟登陆知乎首页的代码。

from scrapy.spiders import CrawlSpider
from  scrapy.selector import Selector
from scrapy.http import Request,FormRequest

class zhihu_login(CrawlSpider):
    name = 'zhihu'
    allowed_domains = ['www.zhihu.com']
    start_urls = ['https://www.zhihu.com/#signin']

    #获得_xsrf属性
    def parse(self, response):
        cel = Selector(response)
        _xsrf = cel.xpath('//html/body/input[@name="_xsrf"]/@value').extract()[0]
        print(_xsrf)
        password = '***'             #密码
        captcha_type = 'cn'
        phone_num = '***'         #电话号码

        Formdata = {'_xsrf':_xsrf,
                    'password':password,
                    'captcha_type':captcha_type,
                    'phone_num':phone_num
        }
        
        #post访问豆瓣登陆url
        return FormRequest.from_response(response,formdata=Formdata,callback=self.after_login,dont_filter = True)

        #对访问后的页面进行解析
    def after_login(self,response):
        cel = Selector(response)
        print(response.body())

测试后发现无效

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