var myButton;

​

function setup() {

    createCanvas(windowWidth, windowHeight);

    myButton = new Button({

        x: width / 2,   y: height / 2,

        width: 100,     height: 50,

        align_x: 0,     align_y: 0,

        content: 'Clicks: 0',

        on_press() {

            count++;

            myButton.text('Clicks: ' + count);

        }

    });

}

​

function draw() {

    background(30);

    myButton.draw();

}