js判断ip实现网页跳转

 

今天朋友提到了个被访问网页如何判断ip...
实现网页跳转的问题...
做个简单的记录...

 

访问链接返回json

var returnCitySN = {"cip": "自己的ip", "cid": "370100", "cname": "山东省济南市"};

indexof判断需拦截的城市

<script type="text/javascript" src="http://pv.sohu.com/cityjson?ie=utf-8"></script>
<script type="text/javascript">
if (returnCitySN.cname.indexOf('city')!=-1){
window.location.href='跳转链接' 
}
</script>

------------------------------------------朋友提供了一种细化的方法-------------------------------------------------

<script type=text/javascript>
var str=returnCitySN["cname"];
var pName=str.substring(0,2);
var cName=str.substring(3,5);
if( pName == '北京' || pName == '上海' || cName == '深圳' || cName == '广州' || pName == ‘贵州' || cName == '厦门'{
window.location.href='....';
}else{
window.location.href='http://www.baidu.com';
}