Javascript to achieve page jump in several ways to share

The first:

<script language="javascript" type="text/javascript">
window.location.href="login.jsp?backurl="+window.location.href; 
</script>

The second:

<script language="javascript">
alert(" return ");
window.history.back(-1);
</script>

The third:

<script language="javascript">
window.navigate("top.jsp");
</script>

Fourth:

<script language="JavaScript">
self.location='top.htm';
</script>

Fifth:

<script language="javascript">
alert(" Illegal access! ");
top.location='xx.jsp';
</script>