弹出提示框的 try…catch 语句

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <script>
  5. var txt = "";
  6. function message() {
  7.   try {
  8.     adddlert("Welcome guest!");
  9.   }
  10.   catch(err) {
  11.     txt = "此页面出错。\n\n";
  12.     txt += "单击“确定”继续查看此页面，\n";
  13.     txt += "或取消以返回主页。\n\n";
  14.     if(!confirm(txt)) {
  15.       document.location.href = "http://www.yousite.com/";
  16.     }
  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>