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。-When you open the page, the page on the left shows a natural floating menu, in the middle of the page, no CSS, JS list on the left to create a pure, either their own use or for study, are very good .