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【译】JavaScript中的Promises
source link: https://juejin.im/post/5ccb10455188250f3a050eb5
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你有没有在JavaScript中遇到过promises并想知道它们是什么？它们为什么会被称为promises呢？它们是否和你以任何方式对另一个人做出的承诺有关呢？ 此外，你为什么要使用promises呢？与传统的JavaScript操作回调(callbacks
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