1.太平洋ip库接口：http://whois.pconline.com.cn/ipJson.jsp?ip=221.219.208.78&json=true
2.js里直接引用
<script src="http://pv.sohu.com/cityjson?ie=utf-8"></script>
<script>
//获取ip
var cip = returnCitySN["cip"];
//获取城市
var cname = returnCitySN["cname"];
</script>
