获取画布对象
var stage = new createjs.Stage("demoCanvas");
画圆
var circle = new createjs.Shape();
circle.graphics.beginFill("DeepSkyBlue").drawCircle(0, 0, 50);
stage.addChild(circle);
Bitmap 将图片划入画布
var bitmap = new createjs.Bitmap("../a.jpg");
stage.addChild(bitmap);