0

我有个问题：

tag = driver.find_elements_by_xpath('//*[@class="du4w35lb k4urcfbm l9j0dhe7 sjgh65i0"]')
tag = driver.find_elements_by_class_name("du4w35lb k4urcfbm l9j0dhe7 sjgh65i0")

我认为两者的工作方式相同，但是当我运行它们时，第一个返回了一些元素，而第二个返回了一个空列表。

4

1 回答 1

0

find_elements_by_class_name(class_name)

find_elements_by_class_name(class_name)按类名查找元素并返回一个包含元素的列表（如果找到的话）。如果没有，则为空列表。它被定义为：

def find_elements_by_class_name(self, name):
    """
    Finds elements by class name.

    :Args:
     - name: The class name of the elements to find.

    :Returns:
     - list of WebElement - a list with elements if any was found.  An
       empty list if not

    :Usage:
        ::

            elements = driver.find_elements_by_class_name('foo')
    """
    warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
    return self.find_elements(by=By.CLASS_NAME, value=name)

值得注意的是，find_elements_by_class_name()接受单个类作为参数。传递多个类，您将面临以下错误：

Message: invalid selector: Compound class names not permitted

一个例子：

tags = driver.find_elements(By.CLASS_NAME, "du4w35lb")

您可以在Invalid selector: Compound class names not allowed error using Selenium中找到相关的详细讨论

find_elements_by_xpath(xpath)

find_elements_by_xpath(xpath)通过 xpath 查找多个元素并返回一个包含元素的列表（如果找到的话）。如果没有，则为空列表。它被定义为：

def find_elements_by_xpath(self, xpath):
    """
    Finds multiple elements by xpath.

    :Args:
     - xpath - The xpath locator of the elements to be found.

    :Returns:
     - list of WebElement - a list with elements if any was found.  An
       empty list if not

    :Usage:
        ::

            elements = driver.find_elements_by_xpath("//div[contains(@class, 'foo')]")
    """
    warnings.warn("find_elements_by_* commands are deprecated. Please use find_elements() instead")
    return self.find_elements(by=By.XPATH, value=xpath)

一个例子：

tags = driver.find_elements(By.XPATH, "//*[@class='du4w35lb k4urcfbm l9j0dhe7 sjgh65i0']")
于 2021-01-29T23:14:59.943 回答