从网站请求完全用JavaScript呈现的html源，并找到所有iframe广告代码

Question

我目前正在尝试使用selenium和BeautifulSoup从网站检索所有iframe标签。问题是我没有得到所有的iframe，因为BS4不在网页中搜索内部的html文档，而且我不认为javascript在HTML内执行，因此可能有些HTML元素没有被渲染。是否有一个Web抓取工具，该工具可让我请求url，检索完全js呈现的HTML文件，然后搜索DOM并获取与iframe匹配的所有标签，即使在内部HTML代码中也是如此。

基本上，我能够在chrome inspector工具中看到我想要的所有标签，但它们未显示在从BS4中的find_all（’iframe’）函数检索的列表中。

这是我的代码：

from bs4 import BeautifulSoup

import requests

from selenium import webdriver

browser = webdriver.Chrome('C:/Users/G/chromedriver.exe')

browser.get("https://reddit.com")

HTML = browser.page_source

innerHTML = browser.execute_script("return document.body.innerHTML")

page = BeautifulSoup(innerHTML, 'html.parser')

for iframe in page.find_all('iframe'):
    print(iframe)

browser.close()

Answer 1

您可以使用以下代码块<iframe>专门获取所有标签 Selenium ：

from selenium import webdriver

browser = webdriver.Firefox(executable_path=r'C:\Utility\BrowserDrivers\geckodriver.exe')
browser.get("https://reddit.com")
frames_tag = browser.find_elements_by_tag_name("iframe")
frames_xpath = browser.find_elements_by_xpath("//iframe")
frames_css = browser.find_elements_by_css_selector("iframe")
print("Frames detected through iframe tag are %s" %frames_tag)
print("Frames detected through xpath are %s" %frames_xpath)
print("Frames detected through css are %s" %frames_css)
browser.quit()

我的控制台上的输出是：

Frames detected through iframe tag are [<selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="ead39d06-0e39-4b40-9425-a86a1fe88d4f")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="1ce10f29-a620-4ce6-90e1-9da563046c70")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="ba8493e4-8246-47a0-9ed4-3f51b8c0f133")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="19c0f134-c243-47bd-96d1-6b06ff66a011")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="95d78fa6-fb4f-4b7c-89c5-9b85965f0e4c")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="e6d2d931-1f35-432f-8825-052e244fe798")>]
Frames detected through xpath are [<selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="ead39d06-0e39-4b40-9425-a86a1fe88d4f")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="1ce10f29-a620-4ce6-90e1-9da563046c70")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="ba8493e4-8246-47a0-9ed4-3f51b8c0f133")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="19c0f134-c243-47bd-96d1-6b06ff66a011")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="95d78fa6-fb4f-4b7c-89c5-9b85965f0e4c")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="e6d2d931-1f35-432f-8825-052e244fe798")>]
Frames detected through css are [<selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="ead39d06-0e39-4b40-9425-a86a1fe88d4f")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="1ce10f29-a620-4ce6-90e1-9da563046c70")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="ba8493e4-8246-47a0-9ed4-3f51b8c0f133")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="19c0f134-c243-47bd-96d1-6b06ff66a011")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="95d78fa6-fb4f-4b7c-89c5-9b85965f0e4c")>, <selenium.webdriver.firefox.webelement.FirefoxWebElement (session="98594106-54a6-4941-a6ab-cd9d92e9afa2", element="e6d2d931-1f35-432f-8825-052e244fe798")>]