selenium使用actions.moveToElement处理菜单

//should set firefox path
        //FirefoxBinary binary=new FirefoxBinary(new File("C:\Program Files (x86)\Mozilla Firefox\firefox.exe"));
        
        //FirefoxProfile profile = null;
        System.setProperty("webdriver.chrome.driver", "e:\chromedriver.exe"); 
        ChromeOptions options = new org.openqa.selenium.chrome.ChromeOptions();
        DesiredCapabilities capabilities = org.openqa.selenium.remote.DesiredCapabilities.chrome();
        capabilities.setCapability("chrome.switches", Arrays.asList("--start-maximized"));
        options.addArguments("--test-type","--start-maximized");
        WebDriver driver=new ChromeDriver(options);
        driver.get("http://www.tsinghua.edu.cn/");
        /*driver.manage().timeouts().pageLoadTimeout(20,TimeUnit.SECONDS);
        driver.manage().timeouts().implicitlyWait(10,TimeUnit.SECONDS);
        driver.manage().timeouts().setScriptTimeout(30,TimeUnit.SECONDS);*/
         
        
        WebElement gaikuang=driver.findElement(By.xpath("//*[@id='nav']/li[2]/a"));
        
        Actions action =new Actions(driver); 
        action.moveToElement(gaikuang).click().perform();
       /*  List <WebElement> elements=driver.findElements(By.tagName("a"));
         
        for(int i=0;i<elements.size();i++){
            System.out.println(i+"------>"+elements.get(i).getText());
            }
         action.moveToElement(elements.get(6)).click().perform();*/
        WebElement xiaozhang=driver.findElement(By.linkText("现任领导"));
        System.out.println(xiaozhang.getText());
        xiaozhang.click();
         
         System.out.println(driver.getCurrentUrl());

        driver.quit();