强制刷新浏览器缓存
Force a browser cache refresh
如果您之前在当前所用浏览器上打开过系统，可能会由于浏览器缓存导致页面不能正常工作。 此时，需通过键盘上的 Control（Ctrl） + F5 来强制刷新缓存 。
If you have previously opened the system in the browser you are currently using, the page may not work properly due to browser caching. In this case, you should use Control (Ctrl) + F5 on your keyboard to force a cache refresh. 
使用键盘上的 Control（Ctrl） + F5 强制刷新缓存
Use Control (Ctrl) + F5 on your keyboard to force a cache refresh
If you have previously opened the system in the browser you are currently using, the page may not work properly due to browser caching. In this case, you should use Control (Ctrl) + F5 on your keyboard to force a cache refresh.
使用键盘上的 Control（Ctrl） + F5 强制刷新缓存
Use Control (Ctrl) + F5 on your keyboard to force a cache refresh