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前端图片压缩及上传
source link: https://juejin.im/post/5c5568c8518825622243a3a5
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前言 图片的上传一般情况下不需要上传大体积的图片，因为如果是用户头像或者是一些要求清晰度不是太高的场景上传大体积图片会很消耗资源，一个是上传耗时比较长，同时也增加了存储的开销，当展示的时候也会消耗下载的带宽，影响加载效率。要求用户上传的图片之前压缩图片很影响用
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