可悬浮的侧边导航栏监听代码
jQuery页面下滑时，侧边栏会黏附在页面上，滚动版块时，对应菜单会点亮 PS：请注意避免包裹层因为flaot浮动的塌陷问题， 建议使用{overflow:hidden}
(When the jQuery page slides down, the sidebar will stick to the page, and the corresponding menu will light up when scrolling the section. PS: Please pay attention to avoid the collapse of the package layer due to flaot floating. It is recommended to use {overflow:hidden})
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