12/1 總結生 三分鐘回顧今天課程
何奕瑋
https://hackmd.io/fM165tMrRdiUybUx8uH1VA?view
The <canvas> element is only a container for graphics. You must use a script to actually draw the graphics. 只是畫布容器，需要 js 在上面畫畫
https://www.w3schools.com/graphics/tryit.asp?filename=trycanvas_empty
<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;"></canvas>
