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>