JavaScript 四舍五入

<html>
   <head>
      <title>JavaScript toFixed() Method</title>
   </head>

   <body>
      <script>
         var num = 488.234;
         document.write("num.toFixed(1) is : " + num.toFixed(1));
         document.write("<br />");
      </script>
   </body>
</html>