diff --git a/bricks/popup.js b/bricks/popup.js
index c5367a8..590b3b7 100644
--- a/bricks/popup.js
+++ b/bricks/popup.js
@@ -38,10 +38,10 @@ bricks.Popup = class extends bricks.VBox {
 	open(){
 		var rect;
 		var w;
-		if (this.widget isinstanceof bricks.Widget){
+		if (this.widget instanceof bricks.Widget){
 			rect = this.widget.showRectage()
 			this.issub = true;
-		} else if (this.widget isinstanceof String){
+		} else if (this.widget instanceof String){
 			var w = bricks.getWidgetById(this.widget, bricks.Body);
 			if (!w){
 				ithis.issub = true