var url = location.search;
 var re=/^\?(.*)(select%20|insert%20|delete%20from%20|count\(|drop%20table|update%20truncate%20|asc\(|mid\(|char\(|xp_cmdshell|exec%20master|net%20localgroup%20administrators|\"|:|net%20user|\'|%20or%20)(.*)$/gi;
 var e = re.test(url);
 if(e) {
  //alert("地址中含有非法字符～");
  windows.location.back();
 }