实际上，如果找不到指定的元素，WebDriver的find_element方法将等待元素的隐式时间.

Actually WebDriver's find_element method will wait for implicit time for the element if the specified element is not found.

WebDriver中没有可检查的预定义方法，例如isElementPresent().您应该为此编写自己的逻辑.

There is no predefined method in WebDriver like isElementPresent() to check. You should write your own logic for that.

逻辑

public boolean isElementPresent()
{
   try
   {
      set_the_implicit time to zero
      find_element_by_xpath()
      set_the_implicit time to your default time (say 30 sec)
      return true;
   }
   catch(Exception e)
   {
       return false;
   }
}

请参阅: http://goo.gl/6PLBw