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Promise 异步流程控制
source link: https://juejin.im/post/59cdb6526fb9a00a4e67c7fb
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前言 最近部门在招前端，作为部门唯一的前端，面试了不少应聘的同学，面试中有一个涉及 Promise 的一个问题是： 网页中预加载20张图片资源，分步加载，一次加载10张，两次完成，怎么控制图片请求的并发，怎样感知当前异步请求是否已完成？ 然而能全部答上
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