废话不多说，贴代码！
<pre name="code" class="html"><!DOCTYPE html>
<html>
<head>
<title>Get my IP</title>
</head>
<body>
<a href="http://www.whatsmyip.us">whatsmyip</a> My Real IP is: <script type="text/javascript" src="http://www.whatsmyip.us/showipsimple.php"></script>
<script type="text/javascript">
document.write("<br/>");
</script>
<a href="http://pv.sohu.com/cityjson?ie=utf-8">Sohu API</a> My IP Info: <script type="text/javascript" src="http://pv.sohu.com/cityjson?ie=utf-8">
</script>
<script type="text/javascript">
var cip = returnCitySN.cip;
var cid = returnCitySN.cid;
var cname = returnCitySN.cname;
document.write("IP is:" + cip + " " + "Address is:" + cname);
</script>
<script type="text/javascript">
document.write("<br/>");
</script>
<a href="http://whois.pconline.com.cn/ipJson.jsp?callback=myip">PConline[太平洋] API</a>
<script type="text/javascript">
/**
* [myip description] 这儿用到了回调函数，myip({"ip":"27.17.140.49","pro":"湖北省","proCode":"420000","city":"武汉市","cityCode":"420100","region":"","regionCode":"0","addr":"湖北省武汉市 电信","regionNames":""});,我们可以看到,回调函数myip()里面有参数,仔细观察不难发现是json型数据,我们在回调函数里面用obj去获取它,这个参数随便定都可以，然后哦这个参数就是我们获取的这个json型数据了.
* @param {[type]} obj [description] 与返回的json型数据一一对应
* @return {[type]} [description]
*/
function myip(obj){
document.write("IP is:" + obj.ip + " " + "Address is:" + obj.addr);
}
</script>
<script type="text/javascript" src="http://whois.pconline.com.cn/ipJson.jsp?callback=myip"></script>
</body>
</html>原文：http://blog.csdn.net/u011763190/article/details/45766535