https://zhang.ge/4750.html

 

 

https://www.mycodes.net/170/7202.htm

jquery右侧随滚动条浮动导航代码

http://sc.chinaz.com/jiaoben/150205203390.htm

 

HTML页面侧栏动态效果- MOONCOM的博客- CSDN博客

https://blog.csdn.net/mooncom/article/details/78518334

 

 

http://www.html580.com/12267

 

https://www.jianshu.com/p/ad33bb08c936

 

 

https://blog.csdn.net/cddcj/article/details/52682265

 

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课外学习：

CSS之定位、居中、浮动及利用浮动设计网页布局和导航：https://blog.csdn.net/pleasecallme_522/article/details/51987269