38 selenium三种等待方式

time.sleep()

import time

from selenium import webdriver
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()
driver.maximize_window()
# 等待3秒，整个页面加载不完成，报超时异常
# driver.set_page_load_timeout(3)   # 设置等待时间，超时则报异常
driver.implicitly_wait(0.01)
driver.get("https://www.baidu.com")
driver.find_element(By.ID,'kw').send_keys("Selenium")
time.sleep(3)    # 强制等待，一般不建议使用
driver.close()

implicitly_wait

import os
import time

from selenium import webdriver
from selenium.webdriver.common.by import By

from utils.get_filepath import download_file_path

path = download_file_path() + "/LATEST_RELEASE"
if os.path.exists(path):
    print("文件存在")
    os.remove(path)
    print("文件已删除")

chromeOptions = webdriver.ChromeOptions()
prefs = {"download.default_directory": "{}".format(download_file_path())}
chromeOptions.add_experimental_option("prefs", prefs)
driver = webdriver.Chrome(chromeOptions)
driver.implicitly_wait(1)
driver.maximize_window()
driver.get("https://registry.npmmirror.com/binary.html?path=chromedriver/")
driver.find_element(By.XPATH, '/html/body/table/tbody/tr[156]/td[2]/a').click()
time.sleep(3)
driver.close()

WebDriverWait 显式等待，很适合ui自动化

import os
import time

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from utils.get_filepath import download_file_path

path = download_file_path() + "/LATEST_RELEASE"
if os.path.exists(path):
    print("文件存在")
    os.remove(path)
    print("文件已删除")

chromeOptions = webdriver.ChromeOptions()
prefs = {"download.default_directory": "{}".format(download_file_path())}
chromeOptions.add_experimental_option("prefs", prefs)
driver = webdriver.Chrome(chromeOptions)
driver.maximize_window()
driver.get("https://registry.npmmirror.com/binary.html?path=chromedriver/")
locate = (By.XPATH,'/html/body/table/tbody/tr[156]/td[2]/a')
element = WebDriverWait(driver,3).until(EC.visibility_of_element_located(locate),"找不到这个元素")
# element = WebDriverWait(driver, 3).until(EC.url_contains("registry.npmmirror.com1"),"找不到这个元素")
# element.click()
time.sleep(3)
driver.close()