<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>输出Hello World</title> <head> <script type="text/javascript"> var txt = ""; try{ adddlert("Wellcome guest~"); }catch(err){ txt="此页面存在一个错误。 " ; txt+="错误描述: " + err.message + " "; txt+="点击“确定”继续。 "; alert(txt); } </script> </head> <body> </body> </html>