common vue-slider

a vue slider component without jQuery.

**events included: ** auto animation，hover on buttons, click the button.

main theory: change the pisition of images container when the currentIndex changes due to the above events.

tips: stop the automatic animation when the mouse hovers on the button or click the button in case of conflict.

**图片轮播组件事件：**自动轮播、鼠标悬停、左右按钮点击

**总体原理：**通过 currentIndex 的变换来调整显示的图片。

**注意事项：**鼠标悬停或是左右按钮点击都停止自动轮播，避免出现冲突。