Actions 动作集

--> 移动鼠标到指定位置（先触发onMouseOver动作）
Actions action = new Actions(driver);
WebElement theRow = page.getInvisibleElement();
action.moveToElement(theRow).perform();
page.getInvisibleElement().click();

--> Ctrl + LeftClick（组合动作）
Actions action = new Actions(driver);
action.keyDown(Keys.CONTROL).perform();
input.click();// WebElement
action.keyUp(Keys.CONTROL).perform();