优化首屏

index.html

@@ -9,11 +9,14 @@
     <script>
       window.localStorage.setItem("maxkbMaskTip", true)
     </script>
+
+    <% if (process.env.PUBLIC_MAXKB_URL) { %>
     <script
       async
       defer
       src="<%= process.env.PUBLIC_MAXKB_URL %>"
     ></script>
+    <% } %>
   </head>
   <body>
     <div id="app"></div>