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>