相信爬取大公司的數據時，常常會遇到頁面信息動態加載的問題，

如果僅僅使用content = urllib2.urlopen(URL).read()，估計信息是獲取不全的，這時候就需要模擬瀏覽器加載頁面的過程，

selenium提供了方便的方法，我也是菜鳥，試了很多種方式，下面提供覺得最靠譜的（已經證明對于爬取新浪微博的topic、twitter under topic完全沒問題）。

至于下面的browser變量是什么，看前面的幾篇文章。

首先是請求對應的URL：

right_URL = URL.split("from")[0] + "current_page="+str(current_page) + "&since_id="+str(since_id) + "&page="+str(page_index) + "#Pl_Third_App__"+str(Pl_Third_App) print right_URL try: browser.get(right_URL) print "loading more, sleep 3 seconds ... 0" time.sleep(3) # NO need for this sleep, but we add ... browser = selenuim_loading_more(browser, method_index=0) except: print "one exception happen ==> get_tweeter_under_topic 2 ..." pass 

然后模擬瀏覽器，加載更多（推薦使用method_index=0，已經證明比其他好用很多）：

def selenuim_loading_more(browser, method_index=0):   if method_index==0:     browser.implicitly_wait(3) # 為了快速滑動，先設置超時時間為1秒     # while True:     for i in range(1, 4): # at most 3 times       print "loading more, window.scrollTo bettom for the", i,"time ..."       browser.execute_script("window.scrollTo(0,document.body.scrollHeight);")       try:         # 定位頁面底部的換頁tab         browser.find_element_by_css_selector("div[class='W_pages']")         break # 如果沒拋出異常就說明找到了底部標志，跳出循環       except NoSuchElementException:         pass # 拋出異常說明沒找到底部標志，繼續向下滑動     browser.implicitly_wait(4) # 將超時時間改回10秒   elif method_index==1:     browser.find_element_by_css_selector("div[class='empty_con clearfix']").click() # loading more     print "loading more, sleep 4 seconds ... 1"     time.sleep(4)     browser.find_element_by_css_selector("div[class='empty_con clearfix']").click() # loading more     print "loading more, sleep 3 seconds ... 2"     time.sleep(2)   elif method_index==2:     load_more_1 = browser.find_element_by_css_selector("div[class='empty_con clearfix']") # loading more             ActionChains(browser).click(load_more_1).perform()     print "loading more, sleep 4 seconds ... 1"     time.sleep(4)     load_more_2 = browser.find_element_by_css_selector("div[class='empty_con clearfix']") # loading more             ActionChains(browser).click(load_more_2).perform()     print "loading more, sleep 3 seconds ... 2"     time.sleep(2)   elif method_index==3:     print "loading more, sleep 4 seconds ... 1"     element = WebDriverWait(browser, 4).until(       EC.element_to_be_clickable((By.CSS_SELECTOR, "div[class='empty_con clearfix']"))     )     element.click()     print "loading more, sleep 2 seconds ... 2"     WebDriverWait(browser, 2).until(       EC.element_to_be_clickable((By.CSS_SELECTOR, "div[class='empty_con clearfix']"))     ).click()   return browser