feature: scrollable支持xy

src/core/wrapper/layout.js

@@ -64,22 +64,22 @@ BI.Layout = BI.inherit(BI.Widget, {
             case true:
             case "xy":
                 this.element.css("overflow", "auto");
-                break;
+                return;
             case false:
                 this.element.css("overflow", "hidden");
-                break;
+                return;
             case "x":
                 this.element.css({
                     "overflow-x": "auto",
                     "overflow-y": "hidden"
                 });
-                break;
+                return;
             case "y":
                 this.element.css({
                     "overflow-x": "hidden",
                     "overflow-y": "auto"
                 });
-                break;
+                return;
             default :
                 break;
         }