IP 和数字互相转换

ip_number_convert.js

function ip2number(ip){
  return parseInt(ip.replace(/(\d+)\.?/g, function(a,b){
    b = parseInt(b).toString(16);
    return b.length === 1 ? '0' + b : b;
  }), 16);
}

function number2ip(number){
  var ip = number & 255;
  for (var i = 0; i < 3; i++){
    number >>= 8;
    ip = (number & 255) + '.' + ip;
  }
  return ip;
}