[LayaAir 2.0]2.0label不改变文本内容,label颜色无法直接改变,1.0可以

只有同时改变文本内容，且内容与上次的不同,label才会改变颜色
开启stroke就会出现这种情况
 
this.label = new Label();
            this.label.text = "王小二的摊位";
            this.label.fontSize = 15;
            this.label.color = "#7CFC00";
            this.label.pos(500, 400);
 
            this.label.width = 300;
this.label.align = "center";
// this.label.stroke = 1;
this.label.strokeColor = "#000000";
            this.label.zOrder=9980
            Laya.stage.addChild(this.label);
            this.label.visible = false;
            this.OpenLabel();
        }
        private OpenLabel() {
            this.label.visible = true;
            this.label.on(Laya.Event.MOUSE_OVER, this, this.ChangeLabelColor);
            this.label.on(Laya.Event.MOUSE_OUT, this, this.ChangeLabelColor);
        }