python+selenium 定位error

成长的喵星人

同一个元素，用不同的方法定位，有时候会报错是为什么？
元素：
<input class="inputstyle" id="u" name="u" value="" tabindex="1" type="text">
代码：
# coding = utf-8
from selenium import webdriver
import time
driver = webdriver.Firefox()
driver.get("https://mail.qq.com/")
driver.find_element_by_id("u").clear()
driver.find_element_by_id("u").send_keys("12345678")

运行后报错：Traceback (most recent call last):
  File "C:\Python34\2222222222.py", line 7, in <module>
    driver.find_element_by_id("u").clear()
  File "C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 266, in find_element_by_id
    return self.find_element(by=By.ID, value=id_)
  File "C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 744, in find_element
    {'using': by, 'value': value})['value']
  File "C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 233, in execute
    self.error_handler.check_response(response)
  File "C:\Python34\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 194, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: Unable to locate element: {"method":"id","selector":"u"}
有人知道为什么吗？急急急

掉渣饼

在driver.get("https://mail.qq.com/")下面加上
time.sleep(5)
driver.switch_to_frame("login_frame")

liiiih

wait 试试呢，

成长的喵星人

掉渣饼 发表于 2016-5-17 13:39
在driver.get("https://mail.qq.com/")下面加上
time.sleep(5)
driver.switch_to_frame("login_frame")

可以运行了