不确定你指的是哪种版本的硒，但是selenium *中的一些命令现在可以这样做：
http://release.seleniumhq.org/selenium-core/0.8.0/reference.html

Not Sure which version of selenium you are referring to, however some commands in selenium * can now do this: http://release.seleniumhq.org/selenium-core/0.8.0/reference.html

• assertNotSomethingSelected


• assertTextNotPresent

等。