add loadin tipg

pano3.html

@@ -93,6 +93,14 @@
  
         }
 
+        #tip{
+            position: absolute;
+            right:15px;
+            bottom: 15px;
+            color: gray;
+            display: none;
+        }
+
     </style>
 </head>
 
@@ -127,12 +135,16 @@
         
     </div> -->
 
+    <div id="tip">Loading...</div>
+
 
 
     <div class="ctrlBtn"></div>
 
 
-    <script src="app.min.js"></script> 
+    <script src="app.min.js"></script>
+
+    <!-- <script src="app.min.js"></script> -->
 
     <script type="text/javaScript">