​

function setup() {

//  let WIDTH = windowWidth;

//  let HEIGHT = windowHeight;

 let WIDTH = 600;

 let HEIGHT = 600;

  createCanvas(WIDTH, HEIGHT);

  frameRate(12);

}

​

function draw() {

  R = random (0, 255)

  G = random (0, 255)

  B = random (0, 255)

  background(R,G,B);

}

​

function mousePressed() {

  let fs = fullscreen();

    fullscreen(!fs);

}