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;
  }

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