JavaScript Launch Code

iio.start(App_Name,'canvas');

App Code

app.add([app.center.x,app.height/3],
  '"click the square" red font Arial 40 center');

function bounce(o){ o.vel.x*=-1 }
var square = app.add([app.center.x,app.height/3*2],
  '100 red vel 5 add o 80 #00baff',{
  bounds:{
    right:[app.width,bounce],
    left:[0,bounce]
  }
}); 

square.click=function(){
  alert('selected')
}