gistfile1.js

//获取本地IP地址
var os = require('os');  
var IPv4,hostName;  
hostName=os.hostname();  
for(var i=0;i<os.networkInterfaces().eth0.length;i++){  
    if(os.networkInterfaces().eth0[i].family=='IPv4'){  
        IPv4=os.networkInterfaces().eth0[i].address;  
    }  
}  
console.log('----------local IP: '+IPv4);  
console.log('----------local host: '+hostName);



//获取外网IP地址
//需要添加库：npm install jquery   
//          npm install iconv-lite  
var $ = require('jquery'),  
    iconv = require('iconv-lite'),  
    http = require('http');  
  
  
var options = {  
    host:'ip.qq.com',  
    port:80,  
    path:'/'  
};  
  
var html = "";//http获取html字符串  
http.get(options, function (res) {  
    res.setEncoding('binary');//or hex  
    res.on('data',function (data) {//加载数据,一般会执行多次  
        html += data;  
    }).on('end', function () {  
            html=iconv.decode(new Buffer(html,'binary'), 'GBK');//把gbk编码转换成  
            var dom = $(html);  
            var ip=dom.find("#login_show .red").text();  
            if(ip.split('.').length==4){  
                console.log('server ip: '+ip);  
            }  
        })  
});