var widgets = 0;

​

function setup() {

  createCanvas(400, 400);

  frameRate(5);

  button = createButton('Make Widget');

  button.position(20, 20);

  button.mousePressed(makeWidget);

}

​

function draw() {

  background(220);

  text("Widgets: " + widgets, 20, 60);

}

​

function makeWidget()

{

  widgets = widgets+1;

}