Python 使用 Selenuim 执行 JavaScript

安装 Selenium 库

// Python 2.x
pip install Selenium

// Python 3.x
pip3 install Selenium
​

安装 PhantomJS

从 PhantomJS 下载地址 中选择相应版本下载并解压

Python 代码

from selenium import webdriver
from bs4 import BeautifulSoup
import time

driver = webdriver.PhantomJS(executable_path='/path/to/download/phantomjs-2.1.1-macosx/bin/phantomjs')
driver.get("http://pythonscraping.com/pages/javascript/ajaxDemo.html")
time.sleep(3)
# print(driver.find_element_by_id('content').text)
pageSource = driver.page_source
bsObj = BeautifulSoup(pageSource)
print(bsObj.find(id="content").get_text())
driver.close()
​

根据控件检查页面是否已经完全加载

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

driver = webdriver.PhantomJS(executable_path='/path/to/download/phantomjs-2.1.1-macosx/bin/phantomjs')
driver.get("http://pythonscraping.com/pages/javascript/ajaxDemo.html")
try:
    element = WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, "loadedButton")))
finally:
    print(driver.find_element_by_id("content").text)
    driver.close()
​

参考

《Python 网络数据采集》