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你也可以手写自己的Promise（一）
source link: https://juejin.im/post/5b5a9603f265da0f6825dbea
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我写这篇文章不打算介绍Promise产生的原因以及它解决的问题，我只是想写一篇关于实现自己Promise的文章。如果代码以及逻辑有什么不对的地方，请大家指出来。就这些，开始正题。 前提：我们要知道Promise是基于Promises/A+规范的。其中好多变量和
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