后台bug

@@ -187,9 +187,8 @@
             var duration;
             var audioDuration;
             if(browser.versions.ios){
-                CMTime audioDuration = vo.duration;
 
-                float duration = CMTimeGetSeconds(audioDuration);
+                float duration = CMTimeGetSeconds(vo.duration);
             }else{
                 duration = parseInt(vo.duration);
             }