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用最少的代码手工实现一个Promise，5分钟看懂
source link: https://juejin.im/post/5cd113f7f265da03b57b6dd6
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Promise简介 Promise 采用面向对象的方式封装了回调函数，可以将回调金字塔改为平行的链式写法，优雅的解决了回调地狱,ES7带来了异步的终级解决方案async/await，可以用写同步代码的方式编写异步代码，而Promise正是async/await
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