fix

@@ -222,7 +222,7 @@ var page = {
                             $msgRoll[0].scrollTop = curT - $frag[0].getBoundingClientRect().height;
                         }
 
-                        // self.rollTimer = setTimeout(rolling, 2000);
+                        self.rollTimer = setTimeout(rolling, 2000);
                     });
                 }