JavaScript 日期valueOf方法

<html>

   <head>
      <title>JavaScript valueOf Method</title>
   </head>

   <body>

      <script type = "text/javascript">
         var dateobject = new Date(1993, 6, 28, 14, 39, 7);
         document.write( dateobject.valueOf() );
      </script>

   </body>
</html>