[]fillTexture使用问题

class Map extends laya.display.Sprite {

    static width: number = 1188;

    static height: number = 594;

    constructor() {

        super();

        Laya.loader.load("res/images/map_01.png", Laya.Handler.create(this, this.bgLoaded));

    }

    bgLoaded(): void {

        let t: Laya.Texture = Laya.loader.getRes("res/images/map_01.png");

        this.width = 1000;

        this.height = 500;

        this.graphics.fillTexture(t, 0, 0);

        this.zOrder = -1;

    }

}