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前端工程师必知之Promise的实现
source link: https://juejin.im/post/5afd2ff26fb9a07aaa11786c
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Promise是什么？ 在Javascript的世界中，代码都是单线程执行的。这就导致我们的代码里会有嵌套回调函数，一旦嵌套过多，导致代码不容易理解和维护。 为了降低异步编程的复杂性，开发人员一直在寻找各种解决方案，Promise只是用来处理异步操作的其中一
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