Node.js Hello World Example

const os = require('os');

var dealTime = (seconds)=>{
    var seconds = seconds|0;
    var day = (seconds/(3600*24))|0;
    var hours = ((seconds-day*3600)/3600)|0;
    var minutes = ((seconds-day*3600*24-hours*3600)/60)|0;
    var second = seconds%60;
    (day<10)&&(day='0'+day);
    (hours<10)&&(hours='0'+hours);
    (minutes<10)&&(minutes='0'+minutes);
    (second<10)&&(second='0'+second);
    return [day,hours,minutes,second].join(':');
};

var dealMem = (mem)=>{
    var G = 0,
        M = 0,
        KB = 0;
    (mem>(1<<30))&&(G=(mem/(1<<30)).toFixed(2));
    (mem>(1<<20))&&(mem<(1<<30))&&(M=(mem/(1<<20)).toFixed(2));
    (mem>(1<<10))&&(mem>(1<<20))&&(KB=(mem/(1<<10)).toFixed(2));
    return G>0?G+'G':M>0?M+'M':KB>0?KB+'KB':mem+'B';
};

//cpu架构
const arch = os.arch();
console.log("cpu架构："+arch);

//操作系统内核
const kernel = os.type();
console.log("操作系统内核："+kernel);

//操作系统平台
const pf = os.platform();
console.log("平台："+pf);

//系统开机时间
const uptime = os.uptime();
console.log("开机时间："+dealTime(uptime));

//主机名
const hn = os.hostname();
console.log("主机名："+hn);

//主目录
const hdir = os.homedir();
console.log("主目录："+hdir);


//内存
const totalMem = os.totalmem();
const freeMem = os.freemem();
console.log("内存大小："+dealMem(totalMem)+' 空闲内存：'+dealMem(freeMem));

//cpu
const cpus = os.cpus();
console.log('*****cpu信息*******');
cpus.forEach((cpu,idx,arr)=>{
    var times = cpu.times;
    console.log(`cpu${idx}：`);
    console.log(`型号：${cpu.model}`);
    console.log(`频率：${cpu.speed}MHz`);
    console.log(`使用率：${((1-times.idle/(times.idle+times.user+times.nice+times.sys+times.irq))*100).toFixed(2)}%`);
});

//网卡
console.log('*****网卡信息*******');
const networksObj = os.networkInterfaces();
for(let nw in networksObj){
    let objArr = networksObj[nw];
    console.log(`\r\n${nw}：`);
    objArr.forEach((obj,idx,arr)=>{
        console.log(`地址：${obj.address}`);
        console.log(`掩码：${obj.netmask}`);
        console.log(`物理地址：${obj.mac}`);
        console.log(`协议族：${obj.family}`);
    });
}