调用了搜狐的ip地址库。

<script src="http://pv.sohu.com/cityjson?ie=utf-8"></script> 
<font id="ip" size="5"></font>
<script type="text/javascript">
(function ip() {
var str=returnCitySN["cip"]+','+returnCitySN["cname"];
var _result=document.getElementById("ip");
_result.innerHTML = str;
})();
</script>