Improving a few articles with audiovisual scrims

Given that a lot of devs prefer watching over reading these days, how about enhancing some of the articles with interactive coding screencasts (aka scrims)?

Here's a live demo of how it would work:
https://javascript-info-objects.netlify.app/?#scroll

We at Scrimba would love to record a few of these and submit a PR so that you can try it out as an experiment for a while, and see how people react. Judging from how coding students usually react to scrims, we think they your readers will love it.

首先查看链接的 Scrimba scrim 和 javascript-info-objects.netlify.app 上的在线演示，然后检查教程文章以确定合适的候选项。该 issue 没有指定文件、测试或具体文章；要视为完成，需要就范围达成一致，并通过 pull request 评估一次视听 scrim 实验。