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[实践总结]纯css实现动态边框
source link: https://juejin.im/post/5cdbc938f265da034d2a38c1
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背景 这几天工作中遇到一个交互需求，要求实现一个效果，当鼠标移入一个元素的时候，元素出现一个动态的边框，如图： 动态边框 思路 看到这个效果，我首先想到的是设置元素的border属性，可惜border不能设置长度，无法实现动效。另外一种实现思路是添加四个div
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