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用canvas绘制流星夜空
source link: https://juejin.im/post/5cbab63551882532c016745d
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流星是一种唯美的天文现象，我一度想用所学知识将它绘制，最近阅读MDN上的canvas教程得到启发，用一个canvas的长尾效果绘制流星…… 什么是长尾效果？ 我们知道，canvas动画实现依赖于画布的重绘,通过不停的清空画布，绘制画布就能实现基本的动画效果。
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