Selenium2 鼠标悬停效果实现

对一些js控件，鼠标悬停的时候出发下拉层的实现

1.使用Action

 public void moveToElement(WebDriver driver, By locator) {
     Actions builder = new Actions(driver);
     builder.moveToElement(driver.findElement(locator)).perform();  

 } 

2.使用SendKeys

 public void moveToElement(WebDriver driver, By locator) {
         driver.findElement(locator).sendKeys(Keys.DOWN);
 }