[JS/CSS] 網頁載入進度條，純前端做法。分子鏈效果 particles.js。很多函式庫

Accurate Page Loading Progress Bar codepen Ahsan K. Rathore

https://github.com/VincentGarreau/particles.js/

https://www.jianshu.com/p/c830b262c56d 很多效果，原文出處 https://hackernoon.com/67-useful-tools-libraries-and-resources-for-saving-your-time-as-a-web-developer-7d3fb8667030