[]图片不能按轴心旋转

        let bgWrapper = new Laya.Box()

        bgWrapper.zOrder = 0

        let bg = new Laya.Sprite();

        bgWrapper.addChild(bg)

        Laya.stage.addChild(bgWrapper)

        bgWrapper.x = 375

        bgWrapper.y = 667

        bg.loadImage("../res/image/interface/intro_bg.png",0,0,1500,1500);

        bg.pivot(750,750)

        bg.alpha = 1

        bg.rotation = 20

    Laya.init(750,1334); 

    Laya.stage.bgColor  = '#000000';  

    Laya.stage.scaleMode = 'fixedauto'

    Laya.stage.screenMode = 'vertical'

  

    let bg = new Laya.Sprite();

    bg.loadImage("../res/image/interface/intro_bg.png",0,0,0,0,Handler.create(this,aa));

    function aa(texture){

        bg.pivot(texture.width,texture.height);

        bg.alpha = 1;

        bg.rotation = 10;

    }