大写或小写字符？

  1. <html>
  2. <body>
  3.  
  4. <script type="text/vbscript">
  5. txt="Have a nice day!"
  6. document.write(ucase(txt))
  7. document.write("<br />")
  8. document.write(lcase(txt))
  9. </script>
  10.  
  11. </body>
  12. </html>