JavaScript 变量和 AJAX 调用

<html>
   <script>
      function getUrlParameter ( param ) {
         return param === "page" ? 500 : false;
      }
      var page = +getUrlParameter("Demo") || 100;
      alert(page);
      page = +getUrlParameter("page") || 100;
      alert(page);
   </script>
   <body>
   </body>
</html>