• 因为在called for each request that goes through the downloader middleware。每一请求进过下载中间键时会被调用。在方法process_request 中集成。

from scrapy.http.response.html import HtmlResponse
from selenium import webdriverclass SeleniumSpiderDownloaderMiddleware(object):"""继承selenium"""def __init__(self):option = webdriver.ChromeOptions()option.add_argument('User-Agent=Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_8; en-us) AppleWebKit/534.50 (KHTML, like Gecko) Version/5.1 Safari/534.50')option.add_experimental_option('excludeSwitches', ['enable-automation'])prefs = {"profile.managed_default_content_settings.images": 2}option.add_experimental_option('prefs',prefs) #设置不加载图片option.add_argument("--headless") # 设置无头self.driver = webdriver.Chrome(options=option)def process_request(self,request,spider):self.driver.get(request.url)time.sleep(1)source = self.driver.page_sourceif not source:print("INFO: %s %s"%(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"),source)) source =source.encode("utf-8")Response=HtmlResponse(url=self.driver.current_url,body=source,request=request,encoding="utf-8")return Response