Selenium之Slider

dragAndDropBy中-15，表示向左平移15个像素

		import org.openqa.selenium.interactions.Action;
		import org.openqa.selenium.interactions.Actions;
		
		WebElement slider = driver.findElement(By.xpath("//*[@id='slider-range-min']/span"));
		Actions move = new Actions(driver);
		Action action = (Action) move.dragAndDropBy(slider, -15, 0).build();
		action.perform();

参考 http://stackoverflow.com/questions/15171745/how-to-slidemove-slider-in-selenium-webdriver