[]切换位图，点击图片距离容器的区域也会触发点击事件

    function TransitionImg() {

    this.flag = false;  //判断条件

    this.img1 = "../laya/assets/comp/haoyoubang-liang.png";   //地址

    this.img2 = "../laya/assets/comp/haoyuobang-hui.png";

    var img = new Laya.Sprite();    //实例

    img.width = 300;    //宽高

    img.height = 200;

    switchImg();

    img.on(Laya.Event.CLICK, this, switchImg)     //点击事件

    Laya.stage.addChild(img);

    function switchImg() {

        img.graphics.clear();      //清除绘制

        var imgUrl = (this.flag = !this.flag) ? this.img1 : this.img2;

        img.loadImage(imgUrl, 100, 100)

    }

}