###########################
主要是定位和操作
driver = webdriver.Firefox()
driver.get()
driver.find_element_by_id()
driver.find_element_by_name()
driver.find_element_by_class_name()
driver.find_element_by_tag_name
driver.find_element_by_link_text(
driver.find_element_by_partial_link_text(
send_keys()
click()
##############################