参考链接:缩放模式 代码
<!-- index.html -->
this.stage.scaleMode = egret.StageScaleMode.SHOW_ALL;
// this.stage.scaleMode = egret.StageScaleMode.NO_SCALE;
// this.stage.scaleMode = egret.StageScaleMode.NO_BORDER;
// this.stage.scaleMode = egret.StageScaleMode.EXACT_FIT;
// this.stage.scaleMode = egret.StageScaleMode.FIXED_WIDTH;
// this.stage.scaleMode = egret.StageScaleMode.FIXED_HEIGHT;
// this.stage.scaleMode = egret.StageScaleMode.FIXED_NARROW;
// this.stage.scaleMode = egret.StageScaleMode.FIXED_WIDTH;
const img = new egret.Bitmap(RES.getRes("bg_jpg"));
this.addChild(img);