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只会用就out了，手写一个符合规范的Promise

 5 years ago
source link: https://juejin.im/post/5b88df2a51882542e56e62c9
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Promise是什么 所谓Promise，简单说就是一个容器，里面保存着某个未来才会结束的事件（通常是一个异步操作）的结果。从语法上说，Promise 是一个对象，从它可以获取异步操作的消息。Promise 提供统一的 API，各种异步操作都可以用同样的方法进

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