JS跳转页面常用的几种方法

<script language="javascript" type="text/javascript">
window.location.href="jb51.jsp?backurl="+window.location.href;
</script> 

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

<script language="javascript">
window.navigate("jb51.jsp");
</script> 

<script language="JavaScript">
self.location=‘jb51.htm‘;
</script> 

<script language="javascript">
alert("非法访问！");
top.location=‘jb51.jsp‘;
</script> 

<script language="javascript" type="text/javascript">
function request(paras){
var url = location.href;
var paraString = url.substring(url.indexOf("?")+1,url.length).split("&");
var paraObj = {}
for (i=0; j=paraString[i]; i++){
paraObj[j.substring(0,j.indexOf("=")).toLowerCase()] = j.substring(j.indexOf("=")+1,j.length);
}
var returnValue = paraObj[paras.toLowerCase()];
if(typeof(returnValue)=="undefined"){
return "";
}else{
return returnValue;
}
}
var theurl
theurl=request("url");
if (theurl!=‘‘){
location=theurl
}
</script>