把基本的javscript代码也复用了

frontend/Web/admin.html

@@ -79,43 +79,8 @@
 
   <script src="/socket.io/socket.io.js"></script>
   <script src="/communication.js"></script>
+  <script src="/basic.js"></script>
   <script>
-    function showDropdown() {
-      document.querySelector('.dropdown-content').style.display = 'block';
-    }
-
-    function hideDropdown() {
-      document.querySelector('.dropdown-content').style.display = 'none';
-    }
-    function ChangeUsername(newUsername) {
-      document.getElementById('username').textContent = newUsername;
-    }
-    async function UpdateUserInfo(){
-      let nm=await GetMyName();
-      let pri=await GetMyPrivilege();
-      if(nm=='')
-      {
-        await RefreshSession();
-        nm=await GetMyName();
-        pri=await GetMyPrivilege();
-      }
-      if(pri==0)
-      {
-        ChangeUsername("[Guest]");
-      }
-      else if(pri==1)
-      {
-        ChangeUsername(nm);
-      }
-      else if(pri==3)
-      {
-        ChangeUsername(nm+" [Worker]");
-      }
-      else if(pri==7)
-      {
-        ChangeUsername(nm+" [Admin]");
-      }
-    }
     document.addEventListener('SessionReady', async () => {
       await UpdateUserInfo();
       if((await GetMyPrivilege())<3)