WebElement menu1=driver.......
WebElement menu2=driver.......
Actions builder = new Actions(driver);
Actions hoverOverRgeistrar = builder.moveToElement(menu1);
hoverOverRgeistrar.perform();
menu2.click();
// builder.moveToElement(element).perform();
Selenium笔记---鼠标悬停显示二级菜单 点击下拉列表
原文：http://www.cnblogs.com/baihuitestsoftware/p/4147277.html