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大厂面试高频考点解析：手写一个符合Promises/A+规范的promise
source link: https://juejin.im/post/5b16800fe51d4506ae719bae
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前言 Promise 是异步编程的一种解决方案，比传统的解决方案回调函数和事件更合理更强大。它由社区最早提出和实现，ES6 将其写进了语言标准，统一了用法，原生提供了Promise对象。本篇不注重讲解promise的用法，关于用法，可以看阮一峰老师的ECMAS
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