回复内容：
是 particles.js 的 demohttps://github.com/VincentGarreau/particles.js/ 正好昨天写了一个类似的，可以参考一下
https://github.com/hilongjw/Qarticles GitHub - VincentGarreau/particles.js: A lightweight JavaScript library for creating particles
github 你值得拥有
很老的一个项目了
拿回来改改样式
套页面上就完事了 知乎用的是楼上说的插件，但是其实几十行就能实现，生成指定个数的随机坐标点，给每个点不同的初速度使之运动，连接每个点与其他所有点生成多个连线，点与点之间的距离小于一个范围两点间连线透明度变为1，大于一个范围透明度变为0，每隔一段时间间隔重新更新画布，根据速度改变坐标，遇到屏幕边界穿过在屏幕相对应的位置出现，告诉你思路，就是不到一百行的js和一个canvas标签的事。
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