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Promise实现原理（附源码）
source link: https://juejin.im/post/5b83cb5ae51d4538cc3ec354
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本篇文章主要在于探究 Promise 的实现原理，带领大家一步一步实现一个 Promise , 不对其用法做说明，如果读者还对Promise的用法不了解，可以查看阮一峰老师的ES6 Promise教程。 接下来，带你一步一步实现一个 Promise 1. P
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