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动画：什么是闭包？
source link: https://juejin.im/post/5dc6449ae51d452bd321252c
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写在前边 正在学习初学前端小伙伴，会感觉 HTML 和 CSS 太简单了，没什么挑战性。那是你没有学过 JS ，JS 中太多的概念初期学习的时候也是很懵逼的，比如 this、原型链、闭包等，即是重点，又是难点。但是你懂了之后会发现很简单，很好理解。 因为小鹿暑
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