SeleniumMiddleware和隐式等待和设置图片不加载

https://www.aqistudy.cn/historydata/monthdata.php?city=%E6%B7%B1%E5%9C%B3

上面这个网站的数据都是动态加载的所以使用selenium中间件来实现动态加载避免自己来分析js代码，设置图片不加载提高效率，设置隐式等待来实现需要的数据加载完成后程序的快速向下运行， 设置随机请求头绕反爬机制，中间件部分代码如下

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
from fake_useragent import UserAgent
from scrapy.http import HtmlResponse

class SeleniumSpiderMiddleware(object):
def process_request(self, request, spider):
# 随机请求头
ua = UserAgent()
ua_use = ua.random
# 设置请求头
dcap = dict(DesiredCapabilities.PHANTOMJS)
# 图片不加载
SERVICE_ARGS = ['--disk-cache=true', '--load-images=false']
dcap["phantomjs.page.settings.userAgent"] = (ua_use)
# 请求头生效， 图片不加载生效
driver = webdriver.PhantomJS(desired_capabilities=dcap, service_args=SERVICE_ARGS)
# 请求的url是这个
url = request.url
driver.get(url)
# 设置等待所有的td标签加载完成
locator = (By.CSS_SELECTOR, 'tbody > tr > td')
WebDriverWait(driver, 10).until(EC.presence_of_all_elements_located(locator))
# 截图看是否有图片加载
driver.save_screenshot('aqi.png')
body = driver.page_source
driver.close()
# body必须为bytes类型
response = HtmlResponse(url=url, request=request, encoding='utf8', body=body.encode())
# 直接return response 直接将response返回到engine不会重新下载
return response