diff --git a/cocos2d/base_nodes/CCNode.js b/cocos2d/base_nodes/CCNode.js
index f57ebb7ca6..ea08902136 100644
--- a/cocos2d/base_nodes/CCNode.js
+++ b/cocos2d/base_nodes/CCNode.js
@@ -2318,7 +2318,7 @@ cc.NodeCanvas = cc.Class.extend(/** @lends cc.NodeCanvas# */{
      */
     setScale:function (scale, scaleY) {
         this._scaleX = scale;
-        this._scaleY = scaleY || scale;
+        this._scaleY = scaleY === undefined ? scale : scaleY;
         this.setNodeDirty();
     },
 
diff --git a/cocos2d/cocoa/CCAffineTransform.js b/cocos2d/cocoa/CCAffineTransform.js
index e5642b93c7..fbf7f30a9d 100644
--- a/cocos2d/cocoa/CCAffineTransform.js
+++ b/cocos2d/cocoa/CCAffineTransform.js
@@ -127,10 +127,10 @@ cc.RectApplyAffineTransform = function (rect, anAffineTransform) {
     var bottomLeft = cc.PointApplyAffineTransform(cc.p(left, bottom), anAffineTransform);
     var bottomRight = cc.PointApplyAffineTransform(cc.p(right, bottom), anAffineTransform);
 
-    var minX = Math.min(Math.min(topLeft.x, topRight.x), Math.min(bottomLeft.x, bottomRight.x));
-    var maxX = Math.max(Math.max(topLeft.x, topRight.x), Math.max(bottomLeft.x, bottomRight.x));
-    var minY = Math.min(Math.min(topLeft.y, topRight.y), Math.min(bottomLeft.y, bottomRight.y));
-    var maxY = Math.max(Math.max(topLeft.y, topRight.y), Math.max(bottomLeft.y, bottomRight.y));
+    var minX = Math.min(topLeft.x, topRight.x, bottomLeft.x, bottomRight.x);
+    var maxX = Math.max(topLeft.x, topRight.x, bottomLeft.x, bottomRight.x);
+    var minY = Math.min(topLeft.y, topRight.y, bottomLeft.y, bottomRight.y);
+    var maxY = Math.max(topLeft.y, topRight.y, bottomLeft.y, bottomRight.y);
 
     return cc.rect(minX, minY, (maxX - minX), (maxY - minY));
 };