具体代码如下

#中间件
from selenium import webdriver
from scrapy.http import HtmlResponse
import time
class ChromeMiddlewares(object):
    def process_request(cls,request,spider):
        if request.meta.has_key('Chrome'):
            driver=webdriver.Chrome()
            driver.get(request.url)
            driver.find_element_by_name('account').send_keys('13808847170')
            driver.find_element_by_name('password').send_keys('aa886688')
            time.sleep(7)
            driver.find_element_by_xpath("/html/body/div[1]/div/div[2]/div[2]/form/div[2]/button").click()
            time.sleep(7)
            for i in range(3):
                driver.execute_script('window.scrollBy(0,3000)')
                time.sleep(5)
            content=driver.page_source
            driver.quit()
            filename='zhihu.html'
            with open(filename,'wb')as fp:
                fp.write(content.encode('utf-8'))
            return HtmlResponse(request.url,body=content,encoding='utf-8',request=request)
            
            
            
#spider文件
# -*- coding: utf-8 -*-
import scrapy
class TestmoniSpider(scrapy.Spider):
    name = "testmoni"
    allowed_domains = ["https://www.zhihu.com/"]
    start_urls = []

def start_requests(self):
    urls='https://www.zhihu.com/#signin'
    rq=scrapy.Request(url=urls,callback=self.parse)
    rq.meta['Chrome']=True
    yield rq

    def parse(self, response):#这个函数主要写解析
        print response.text
        
        
setting文件
DOWNLOADER_MIDDLEWARES={'testselenium.middlewares.ChromeMiddlewares':1,}