diff --git a/demo/js/core/abstract/demo.virtual_group.js b/demo/js/core/abstract/demo.virtual_group.js
index e07175f601..77e33d2160 100644
--- a/demo/js/core/abstract/demo.virtual_group.js
+++ b/demo/js/core/abstract/demo.virtual_group.js
@@ -66,14 +66,13 @@ Demo.Item = BI.inherit(BI.Widget, {
     update: function (item) {
         this.label.setText(item.value);
         console.log("更新了一项");
-        return true;
     },
 
     created: function () {
         console.log("创建了一项");
     },
 
-    destroyed: function(){
+    destroyed: function () {
         console.log("删除了一项");
     }
 });
diff --git a/dist/core.js b/dist/core.js
index ee7845ebb6..8c5bc6811e 100644
--- a/dist/core.js
+++ b/dist/core.js
@@ -14342,9 +14342,7 @@ BI.Widget = BI.inherit(BI.OB, {
 
     },
 
-    update: function () {
-
-    },
+    update: null,
 
     destroyed: function () {
     },
@@ -19482,9 +19480,10 @@ BI.Layout = BI.inherit(BI.Widget, {
             return;
         }
 
-        var updated;
-        if (updated = this._children[this._getChildName(index)].update(this._getOptions(item))) {
-            return updated;
+        var child = this._children[this._getChildName(index)];
+        if (child.update) {
+            child.update(this._getOptions(item));
+            return true;
         }
         this._children[this._getChildName(index)].destroy();
         var w = this._addElement(index, item);
diff --git a/src/core/widget.js b/src/core/widget.js
index b5d1f56661..860e16d4d9 100644
--- a/src/core/widget.js
+++ b/src/core/widget.js
@@ -43,9 +43,7 @@ BI.Widget = BI.inherit(BI.OB, {
 
     },
 
-    update: function () {
-
-    },
+    update: null,
 
     destroyed: function () {
     },
diff --git a/src/core/wrapper/layout.js b/src/core/wrapper/layout.js
index 424a51e67a..4dc406e53f 100644
--- a/src/core/wrapper/layout.js
+++ b/src/core/wrapper/layout.js
@@ -224,9 +224,10 @@ BI.Layout = BI.inherit(BI.Widget, {
             return;
         }
 
-        var updated;
-        if (updated = this._children[this._getChildName(index)].update(this._getOptions(item))) {
-            return updated;
+        var child = this._children[this._getChildName(index)];
+        if (child.update) {
+            child.update(this._getOptions(item));
+            return true;
         }
         this._children[this._getChildName(index)].destroy();
         var w = this._addElement(index, item);