第一种:
    <script language=“javascript” type=“text/javascript”>
           window.location.href=
“login.jsp?backurl=”+window.location.href;
    </script>

第二种:
    <script language=“javascript”>
alert(
“返回”);
window.history.back(-1);
   </script>

第三种:
   <script language=“javascript”>
window.navigate(
“top.jsp”);
  </script>

第四种:
   <script language=“JavaScript”>
          self.location=’top.htm’;
   </script>

第五种:
   <script language=“javascript”>
          alert(
“非法访问!”);
          top.location=’xx.jsp’;
   </script>