ip地址转换成十进制算法

let exp = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/;
    let IP = '219.239.255.255';
    let result = exp.exec(IP);
    let ip;
    if (result) {

        if (result) {
            let ip_Arr = result.slice(1);
            console.log(ip_Arr);
            ip =
          ((parseInt(ip_Arr[0]) << 24) |
            (parseInt(ip_Arr[1]) << 16) |
            (parseInt(ip_Arr[2]) << 8) |
            parseInt(ip_Arr[3])) >>>
          0;
        } else if (/^\d+$/.test(IP) && (ip = parseInt(IP)) >= 0 && ip <= 0xffffffff) {
            ip = +IP;
        } else {
            throw 'The IP address is not normal! >> ' + IP;
        }
    }
    console.log(ip);

解析纯真数据库插件lib-qqwry

纯真IP库