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.

先檢視連結的 Scrimba scrim 和 javascript-info-objects.netlify.app 上的線上示範，然後檢查教學文章，以找出合適的候選項目。此 issue 沒有指定檔案、測試或特定文章；若要視為完成，就需要對範圍達成共識，並透過 pull request 評估一項視聽 scrim 實驗。