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3分钟教你用原生js实现具有进度监听的文件上传预览组件
source link: https://juejin.im/post/5d142720f265da1bc4146433
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本文主要介绍如何使用原生js，通过面向对象的方式实现一个文件上传预览的组件，该组件利用FileReader来实现文件在前端的解析，预览，读取进度等功能，并对外暴露相应api来实现用户自定义的需求，比如文件上传，进度监听，自定义样式，读取成功回调等。 组件设计架
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