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异步多图加载这件小事儿（Promise与async)
source link: https://juejin.im/post/5ae92c1b518825670b33e2ab
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日常开发过程中，时不时会遇到要同时预加载几张图片，并且等都加载完再干活的情况，结合 Promise 和 async/await 代码会优雅很多，但也容易遇到坑，今天就来简单聊聊。 ES5 先从最基本的 ES5 说起，基本思路就是做一个计数器，每次 image
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