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用canvas 画烟花
source link: https://juejin.im/post/5b587f59e51d45191e0d04ae
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开始 最终效果： codepen 一开始都是一个单一的用例，定位在画布中央，再扩展开来 先获取canvas元素及可视宽高 let canvas = document.querySelector('#canvas') let context =
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