From 1ecd93c24cb88e79ac0bcbc22f79bbed2524422e Mon Sep 17 00:00:00 2001
From: 06wj <06wj@163.com>
Date: Fri, 28 Apr 2017 17:59:15 +0800
Subject: [PATCH] fix: Tween Ease.Back bug

---
 src/tween/Tween.js | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/tween/Tween.js b/src/tween/Tween.js
index b0996a0b..68ac8bfb 100644
--- a/src/tween/Tween.js
+++ b/src/tween/Tween.js
@@ -328,11 +328,15 @@ return Class.create(/** @lends Tween.prototype */{
 
         //elapsed ratio
         var ratio = elapsed / me.duration, complete = false, callback;
-        ratio = ratio <= 0 ? 0 : ratio >= 1 ? 1 : me.ease ? me.ease(ratio) : ratio;
+        ratio = ratio <= 0 ? 0 : ratio >= 1 ? 1 : ratio;
+        var easeRatio = me.ease ? me.ease(ratio) : ratio;
 
         if(me.reverse){
             //backward
-            if(me._reverseFlag < 0) ratio = 1 - ratio;
+            if(me._reverseFlag < 0) {
+                ratio = 1 - ratio;
+                easeRatio = 1 - easeRatio;
+            }
             //forward
             if(ratio < 1e-7){
                 //repeat complete or not loop
@@ -351,7 +355,7 @@ return Class.create(/** @lends Tween.prototype */{
         me.time = elapsed;
 
         //render & update callback
-        me._render(ratio);
+        me._render(easeRatio);
         (callback = me.onUpdate) && callback.call(me, ratio, me);
 
         //check if complete