[]为什么显示不了

var sp = new Laya.Sprite();
sp.graphics.drawRect(this.mouse_x, this.mouse_y, 10, 10, "#ff0000");
//var htmlC:Laya.HTMLCanvas = sp.drawToCanvas(375,440,0,0).getCanvas().toDataURL();
var htmlCanvas:Laya.HTMLCanvas = sp.drawToCanvas(375,440,0,0);
var texture:Laya.Texture = new Laya.Texture(htmlCanvas);
var sps:Laya.Sprite = new Laya.Sprite().pos(this.mouse_x,this.mouse_y+100);
sps.graphics.drawTexture(texture);
Laya.stage.addChild(sps);
 
代码有什么问题吗   为什么舞台没有显示