var colors = [];

function setup() {

    createCanvas(800, 300);

    background(0);

    colors = [

        [245, 3, 155],

        [13, 159, 215],

        [148, 177, 191],

        [100, 189, 167],

        [242, 226, 133],

        [176, 230, 110],

        [123, 90, 240]

    ];

}

function draw() {

    noStroke();

    if(pressed === true){

        var randomIndex = parseInt(random(colors.length), 10);

        // 将给定数字转化为整型

        var randomSize = random(200);

        fill(colors[randomIndex]);

        ellipse(

            random(width),

            random(height),

            randomSize,

            randomSize

        );

    }

    pressed = false;

}

function keyPressed(){

    pressed = true;

}