[LayaAirIDE 1.0]鼠标 MOUSE_DOWN Event 回来的信息不符合

为什么回来的是 “mouseout” 而不是 "mousedown" ?


代码如下：
function createSprite() {
picture = new Sprite();

picture.loadImage(picturePath);

Laya.stage.addChild(picture);

var texture = Laya.loader.getRes(picturePath);
picturePath.pivot(texture.width / 2, texture.height / 2);
picture.x = Laya.stage.width / 2;
picture.y = Laya.stage.height / 2;
picture.scale(cardScaleValue, cardScaleValue, true);

picture.on(Event.MOUSE_DOWN, this, onStartPicture(Picture);
}

function onStartDragPicture(e) {
console.log('onStartDragPicture e', e);

}

返回的信息：
Event

_stoped: false

currentTarget: Stage {focus: null, designWidth: 1307, designHeight: 758, canvasRotation: false, canvasDegree: 0, …}

nativeEvent: MouseEvent {isTrusted: true, screenX: 906, screenY: 460, clientX: 457, clientY: 278, …}

target: Stage {focus: null, designWidth: 1307, designHeight: 758, canvasRotation: false, canvasDegree: 0, …}

touchId: 0

type: "mouseout"