问在EaselJS中拖动容器

EN

var canvas = document.getElementById('canvas');
canvas.width = 1000;
canvas.height = 550;

var stage = new createjs.Stage(canvas);
var container = new createjs.Container();
stage.addChild(container);

container.addEventListener("pressmove", function (evt) {
    console.log('press');
    evt.currentTarget.set({
        x: evt.stageX,
        y: evt.stageY
    });
    stage.update();
});

// Add a background
var bg = new createjs.Shape();
bg.graphics.beginStroke("#000");
bg.graphics.beginFill("#fff");
bg.graphics.setStrokeStyle(1);
bg.graphics.drawRect(0, 0, 400, 400);

container.addChild(bg);

// Add a thing
var square = new createjs.Shape();
square.graphics.beginFill("#000");
square.graphics.drawRect(0, 0, 50, 50);
square.x = 100;
square.y = 100;

container.addChild(square);

stage.update();