JavaScript 字符串 string toUpperCase方法

<html>
   <head>
      <title>JavaScript String toUpperCase() Method</title>
   </head>

   <body>

      <script type = "text/javascript">
         var str = "Apples are round, and Apples are Juicy.";
         document.write(str.toUpperCase( ));
      </script>

   </body>
</html>