Effects: set default easing using jQuery.easing._default

Fixes gh-2219
Close gh-2218

1 files changed, 3 insertions, 2 deletions

diff --git a/src/effects/Tween.js b/src/effects/Tween.js
index 40a02659e..810d11133 100644
--- a/src/effects/Tween.js
+++ b/src/effects/Tween.js
@@ -13,7 +13,7 @@ Tween.prototype = {
 	init: function( elem, options, prop, end, easing, unit ) {
 		this.elem = elem;
 		this.prop = prop;
-		this.easing = easing || "swing";
+		this.easing = easing || jQuery.easing._default;
 		this.options = options;
 		this.start = this.now = this.cur();
 		this.end = end;
@@ -105,7 +105,8 @@ jQuery.easing = {
 	},
 	swing: function( p ) {
 		return 0.5 - Math.cos( p * Math.PI ) / 2;
-	}
+	},
+	_default: "swing"
 };
 
 jQuery.fx = Tween.prototype.init;