<script>
var bgsrc;
var bg;
var text;
function main() {
var stage=new createjs.Stage(document.getElementById("mycanvas");
bgsrc = new Image();
bgsrc.src="a.png";
bgsrc.onload = handleLoad;
text = new createjs.Text();
}

function handleLoad() {
bg = new createjs.Bitmap(this);
text.text = "This is Text";
stage.addChild(bg, text);
stage.update();
}