js实现页面跳转的几种方式
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>