第一种悬停方法：

action.clickAndHold();// 鼠标悬停在当前位置，既点击并且不释放

 action.clickAndHold(onElement);// 鼠标悬停在 onElement 元素的位置

不过clickAndHold不能完全模拟鼠标悬停，而是会导致二级菜单的闪现，需要用js

第二种悬停方法：

public static void MouseHoverByJavaScript(WebElement targetElement,WebDriver driver)    {         String mouseHoverjs = "var evObj = document.createEvent('MouseEvents');" +                            "evObj.initMouseEvent(\"mouseover\",true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);" +                            "arguments[0].dispatchEvent(evObj);";        JavascriptExecutor js = (JavascriptExecutor)driver;        js.executeScript(mouseHoverjs, targetElement);      }