selenium 鼠标悬停

针对页面上的二级菜单，需要鼠标悬停才能进行操作。

/**
   * Clicks (without releasing) in the middle of the given element. This is equivalent to:
   * <i>Actions.moveToElement(onElement).clickAndHold()</i>
   *
   * @param onElement Element to move to and click.
   * @return A self reference.
   */
  public Actions clickAndHold(WebElement onElement) {
    action.addAction(new ClickAndHoldAction(mouse, (Locatable) onElement));
    return this;
  }

使用方法：最后一定不要忘记perform()

Actions actions = new Actions(driver);
actions.clickAndHold(webElement).perform();

或者：

Actions actions = new Actions(driver);
actions.moveToElement(webElement).clickAndHold().perform();

或者：使用js来模拟鼠标悬停

/**
     * JScript实现鼠标悬停
　　　* @author lozz
     */
    public void mouseHoverJScript(WebElement HoverElement) {
        // TODO Auto-generated method stub
        try {
            if (isElementPresent(HoverElement)) {
                String mouseOverScript = "if(document.createEvent){var evObj = document.createEvent('MouseEvents');evObj.initEvent('mouseover', true, false); arguments[0].dispatchEvent(evObj);} else if(document.createEventObject) { arguments[0].fireEvent('onmouseover');}";
                ((JavascriptExecutor) driver).executeScript(mouseOverScript, HoverElement);
            } else {
                System.out.println("Element was not visible to hover " + "\n");
            }
        } catch (StaleElementReferenceException e) {
            // TODO: handle exception
            System.out.println("Element with " + HoverElement + "元素未附加到页面文档" + e.getStackTrace());
        } catch (NoSuchElementException e) {
            // TODO: handle exception
            System.out.println("Element " + HoverElement + " 元素未在DOM中没有找到" + e.getStackTrace());
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
            System.out.println("悬停时发生错误" + e.getStackTrace());
        }
    }

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