一般編輯器無法顯示KhanAcademy的JS語法原因

1. 未設定Processing.js函式庫
   https://cdn.jsdelivr.net/processing.js/1.4.8/processing.min.js
2. 沒有在html寫canvas標籤

 解決方法

canvas#mycanvas

var sketchProc = function(processingInstance) {
     with (processingInstance) {
        size(400, 400); 
        frameRate(30);
        
        // 這邊貼上KhanAcademy的JS程式碼
    
    }};

    // Get the canvas that Processing-js will use
    var canvas = document.getElementById("mycanvas"); 
    // Pass the function sketchProc (defined in myCode.js) to Processing's constructor.
    var processingInstance = new Processing(canvas, sketchProc);