ip地址转十进制

ip2dec.js

#!/usr/bin/nodejs

function showHelp(){
    console.log('Usage: ipnum [ip] ...');
}

function convert(ip){
    if(typeof ip !== 'string') return false;
    if(!/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(ip)) return false;

    var arr = ip.split('.');
    for(var i = 0; i < arr.length; i++) if(+arr[i] > 255 || +arr[i] < 0) return false;

    var buf = new Buffer(arr);
    return parseInt(buf.toString('hex'), 16);
}

if(process.argv.length <= 2){
    showHelp();
    return;
}

var args = process.argv.slice(2);

for(var i = 0; i < args.length; i++){
    console.log(args[i] + ' -> ' + convert(args[i]) ?? 'Invalid!');
}