当打开网页时，页面中左侧就自然地显示出一个悬浮的菜单，在网页的中间部位，无CSS，纯JS打造的左侧列表，无论是自己使用还是用来学习，都是非常不错的。-Naturally when open the page, the left side of the page shows a floating menu, the middle of the page, CSS, pure JS to create the list on the left, whether it is their own use or for learning are very good .