try…catch 语句

  1. <html>
  2. <head>
  3. <script type="text/javascript">
  4. var txt=""
  5. function message()
  6. {
  7. try
  8.    {
  9.    adddlert("Welcome guest!")
  10.    }
  11. catch(err)
  12.    {
  13.    txt="本页中存在错误。\n\n"
  14.    txt+="错误描述：" + err.description + "\n\n"
  15.    txt+="点击“确定”继续。\n\n"
  16.    alert(txt)
  17.    }
  18. }
  19. </script>
  20. </head>
  21.  
  22. <body>
  23. <input type="button" value="查看消息" onclick="message()" />
  24. </body>
  25.  
  26. </html>