diff --git a/frameworks/js-bindings/bindings/script/jsb_spine.js b/frameworks/js-bindings/bindings/script/jsb_spine.js
index f8d48d1f12..cb6e4acf57 100644
--- a/frameworks/js-bindings/bindings/script/jsb_spine.js
+++ b/frameworks/js-bindings/bindings/script/jsb_spine.js
@@ -22,8 +22,12 @@
 
 sp.SkeletonAnimation.prototype._ctor = function(skeletonDataFile, atlasFile, scale) {
 	if(atlasFile) {
-		this.initWithFile(skeletonDataFile, atlasFile, scale);
-		this.initialize();
+        if (isNaN(scale)) {
+            scale = 1;
+        }
+        
+        this.initWithFile(skeletonDataFile, atlasFile, scale);
+        this.initialize();
 	}
 };
 
diff --git a/samples/js-tests/src/SpineTest/SpineTest.js b/samples/js-tests/src/SpineTest/SpineTest.js
index 8d47e49894..11e47c05c0 100644
--- a/samples/js-tests/src/SpineTest/SpineTest.js
+++ b/samples/js-tests/src/SpineTest/SpineTest.js
@@ -82,7 +82,14 @@ var SpineTest = BaseTestLayer.extend({
         // Make Spine's Animated skeleton Node
         // You need 'json + atlas + image' resource files to make it.
         // No JS binding for spine-c in this version. So, only file loading is supported.
-        var spineBoy = sp.SkeletonAnimation.create('res/skeletons/spineboy.json', 'res/skeletons/spineboy.atlas');
+        var SpineBoyAnimation = sp.SkeletonAnimation.extend({
+            ctor: function() {
+                this._super('res/skeletons/spineboy.json', 'res/skeletons/spineboy.atlas');
+                cc.log("Extended SkeletonAnimation");
+            }
+        });
+        
+        var spineBoy = new SpineBoyAnimation();
         spineBoy.setPosition(cc.p(size.width / 2, size.height / 2 - 150));
         spineBoy.setAnimation(0, 'walk', true);
         spineBoy.setMix('walk', 'jump', 0.2);