Selenium 等待

等待

　　在测试中，添加等待是为了避免页面为渲染完成时操作导致错误

　　等待分为三种：

　　强制等待

　　隐式等待

　　显式等待

隐式等待

　　在元素可以找到，但交互错误的情况下不适用隐式等待。造成原因为加载过程中先加载html，css和js后加载，导致点击时交互未加载。

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

def implicitly_method():
    driver = webdriver.Edge()
    url = 'https://www.cnblogs.com/'
    driver.get(url)
    driver.implicitly_wait(2)
    driver.find_element(By.LINK_TEXT,"Oracle与MySQL的差异和对比").click()
    time.sleep(3)

if __name__ == '__main__':
    implicitly_method()

显式等待

from  selenium import webdriver
import time
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

def implicitly_method():
    driver = webdriver.Edge()
    url = 'https://www.cnblogs.com/'
    driver.get(url)
    WebDriverWait(driver,10).until(EC.visibility_of_element_located((By.LINK_TEXT, "Oracle与MySQL的差异和对比")))
    driver.find_element(By.LINK_TEXT,"Oracle与MySQL的差异和对比").click()
    time.sleep(3)

if __name__ == '__main__':
    implicitly_method()