本文开始逐渐了解现代浏览器的模型，搞清楚了浏览器大略是怎么回事，能极大促进理解前端js语言和框架的种种特点。
以下先收集文章，待后续理解整理后再来写：
http://davidshariff.com/blog/what-is-the-execution-context-in-javascript/ | What is the Execution Context & Stack in JavaScript? by David Shariff
https://www.jianshu.com/p/e865c3a7ba10 | 理解事件循环与任务队列 - 简书
https://juejin.im/post/5b5873a1e51d4519133fbc35 | 跟着 Event loop 规范理解浏览器中的异步机制 - 掘金
https://www.cnblogs.com/lpggo/p/8127604.html | async/await 执行顺序详解 - 鲁小胖 - 博客园
https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&tn=baidu&wd=chrome%20%E6%9C%80%E6%96%B0%E7%89%88&oq=chrome%2520%25E6%259C%2580%25E6%2596%25B0%25E7%2589%2588&rsv_pq=cedd71fa00013838&rsv_t=47fczVLQJbmrFOeOEgCg36jIGY1pP7KRVfxx%2FG3SEFlnqbFmnQ6GW5fFTp8&rqlang=cn&rsv_enter=0 | chrome 最新版_百度搜索
http://down.tech.sina.com.cn/page/40975.html | 【Google Chrome(谷歌浏览器)简体中文版 73.0.3679.0 Dev/72.0.3626.71 Beta/71.0.3578.98 下载】_网络浏览_网络工具_软件下载_新浪科技_新浪网
https://www.cnblogs.com/SamWeb/p/8417940.html | 用 async/await 来处理异步 - SamWeb - 博客园
https://www.html5rocks.com/zh/tutorials/internals/howbrowserswork/#Parsing_general | 浏览器的工作原理：现代网络浏览器幕后揭秘 - HTML5 Rocks