自架Scratch筆記
http://blog.hashteacher.com/?p=977
https://blog.everlearn.tw/scratch3/%E9%96%8B%E7%99%BC%E4%BD%A0%E7%9A%84%E7%AC%AC%E4%B8%80%E5%80%8B-scratch-3-0-extension
https://scratch.mit.edu/projects/559115070/editor/