js improve

www/js/beauty.js

@@ -229,7 +229,6 @@ if ($('#pr-player').length > 0 && typeof(videojs) != 'undefined') {
         var videoItem = noSnapVideos.pop();
         mc_video_id = videoItem.id;
 
-        console.log(mc_video_id, videoItem.url);
         try {
             myPlayer.src(videoItem.url);
             myPlayer.play();
@@ -254,18 +253,20 @@ if ($('#pr-player').length > 0 && typeof(videojs) != 'undefined') {
             ctx.drawImage( video, 0, 0, canvas.width, canvas.height );
 
             var snapshotImg = canvas.toDataURL('image/jpeg');
+            var duration = myPlayer.duration();
 
             //更新视频封面图和视频时长
+            if (duration && snapshotImg) {
                 $('#poster_'+mc_video_id).attr('src', snapshotImg);
-            $('#poster_'+mc_video_id).parent('a').find('.duration').text(formatDuration(myPlayer.duration()));
+                $('#poster_'+mc_video_id).parent('a').find('.duration').text(formatDuration(duration));
+            }
 
             saveVideoMeta(mc_video_id, {
-                duration: myPlayer.duration(),
+                duration: duration,
                 snapshot: snapshotImg
             });
 
-            mc_video_id = null;
-
+            mc_video_id = '';           //reset
             tryToGetVideoSnapshot();    //go next
         }
     });