[]小游戏初始化黑屏

Layaair正常，但是微信开发者工具调试，真机调试，背景始终黑色，写了个最简单的框架还是黑，更改bgColor无效

Laya.MiniAdpter.init();
Laya.init(450, 800);
class GameMain {
constructor() {

Laya.stage.scaleMode = Laya.Stage.SCALE_SHOWALL;
Laya.stage.screenMode = Laya.Stage.SCREEN_NONE;
Laya.stage.alignH = Laya.Stage.ALIGN_CENTER;
Laya.stage.alignV = Laya.Stage.ALIGN_MIDDLE;

Laya.stage.bgColor = "#fff00f";
this.onLoop();
}
onLoop() {
console.log("good");
}
}
new GameMain();