几种PC端driver的效率比较：
from selenium import webdriver
import time
drivers = ['HtmlUnit'， 'PhantomJS'， 'Chrome'， 'FF'， 'IE']
dervers_time = {
'HtmlUnit' : 0，
'PhantomJS' : 0，
'Chrome' : 0，
'FF' : 0，
'IE' : 0，
}
times = 50
def run_with_Chrome():
common_step(webdriver.Chrome())
def run_with_FF():
common_step(webdriver.Firefox())
def run_with_IE():
common_step(webdriver.Ie())
def run_with_PhantomJS():
common_step(webdriver.PhantomJS(executable_path=r'C:Python27Scriptsphantomjs.exe'))
def run_with_HtmlUnit():
driver = webdriver.Remote("http://localhost:4444/wd/hub"，
desired_capabilities=webdriver.DesiredCapabilities.HTMLUNIT)
common_step(driver)
def common_step(driver):
driver.get('http://www.baidu.com')
ele = driver.find_element_by_id('su')
print ele.get_attribute('value')
driver.quit()
for i in range(times):
print '=============Times %s============' % i
for driver in drivers:
start = time.time()
print start
eval('run_with_%s()'%driver)
end = time.time()
print end
elapse_time = end-start
dervers_time[driver] += elapse_time
print 'elapse for %s:%s' % (driver， elapse_time)
for k，v in dervers_time.items():
print 'avg elapse for %s in %s times:%s' % (k， times， v/times)
　　得出的结果：

　　快的依次是htmlunit、PhantomJS、chrome、ie、ff