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前端本地文件操作与上传
source link: https://juejin.im/post/5a193b4bf265da43052e528a
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前端无法像原生APP一样直接操作本地文件，否则的话打开个网页就能把用户电脑上的文件偷光了，所以需要通过用户触发，用户可通过以下三种方式操作触发：通过input type="file" 选择本地文件通过拖拽的方式把文件拖过来在编辑框里面复制粘贴第一种是最常用的手
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