前端使用js来获取ip起始和结束地址

为了下次找的方便，写个文章记录下

ip起始地址

function getLowAddr (ip, netMask) {let lowAddr = '';const ipArray = [];const netMaskArray = [];// I参数不正确if (ip.split('.').length !== 4 || netMask === '') {return '';}for (let i = 0; i < 4; i += 1) {ipArray[i] = Number(ip.split('.')[i]);netMaskArray[i] = netMask.split('.')[i];if (Number(ipArray[i]) > 255 ||Number(ipArray[i]) < 0 ||(Number(netMaskArray[i]) > 255 && Number(netMaskArray[i]) < 0)) {return '';}ipArray[i] = Number(ipArray[i]) & Number(netMaskArray[i]);}// 构造最小地址for (let i = 0; i < 4; i += 1) {if (i === 3) {ipArray[i] = Number(ipArray[i]) + 1;}if (lowAddr === '') {lowAddr += ipArray[i];} else {lowAddr += `.${ipArray[i]}`;}}return lowAddr;}

ip结束地址

function getHighAddr (ip, netMask) {let lowAddr = getLowAddr(ip, netMask);let hostNumber = getHostNumber(netMask);if ('' === lowAddr || hostNumber === 0) {return '';}let lowAddrArray = [];for (let i = 0; i < 4; i += 1) {lowAddrArray[i] = Number(lowAddr.split('.')[i]);if (i === 3) {lowAddrArray[i] = Number(lowAddrArray[i]) - 1;}}lowAddrArray[3] = lowAddrArray[3] + Number(hostNumber - 1);//alert(lowAddrArray[3]);if (lowAddrArray[3] > 255) {let k = parseInt(String(lowAddrArray[3] / 256), 10);//alert(k);lowAddrArray[3] = lowAddrArray[3] % 256;//alert(lowAddrArray[3]);lowAddrArray[2] = Number(lowAddrArray[2]) + Number(k);//alert(lowAddrArray[2]);if (lowAddrArray[2] > 255) {k = parseInt(String(lowAddrArray[2] / 256), 10);lowAddrArray[2] = lowAddrArray[2] % 256;lowAddrArray[1] = Number(lowAddrArray[1]) + Number(k);if (lowAddrArray[1] > 255) {k = parseInt(String(lowAddrArray[1] / 256), 10);lowAddrArray[1] = lowAddrArray[1] % 256;lowAddrArray[0] = Number(lowAddrArray[0]) + Number(k);}}}let highAddr = '';for (let i = 0; i < 4; i += 1) {if (i === 3) {lowAddrArray[i] -= 1;}if ('' === highAddr) {highAddr = String(lowAddrArray[i]);} else {highAddr += '.' + lowAddrArray[i];}}return highAddr;}

获取主机数

/*** 获取主机数** @param netMask* @returns {Number}*/function getHostNumber(netMask) {let hostNumber = 0;const netMaskArray = [];for (let i = 0; i < 4; i += 1) {netMaskArray[i] = netMask.split('.')[i];if (Number(netMaskArray[i]) < 255) {hostNumber = 256 ** (3 - i) * (256 - Number(netMaskArray[i]));break;}}return hostNumber;}

转换掩码的格式

function getNetMask(inetMask) {let netMask = '';if (inetMask > 32) {return netMask;}// 子网掩码为1占了几个字节const num1 = parseInt(`${inetMask / 8}`, 2);// 子网掩码的补位位数let num2 = inetMask % 8;const array = [];for (let i = 0; i < num1; i += 1) {array[i] = 255;}for (let i = num1; i < 4; i += 1) {array[i] = 0;}for (let i = 0; i < num2; num2 -= 1) {array[num1] += 2 ** (8 - num2);}netMask = `${array[0]}.${array[1]}.${array[2]}.${array[3]}`;return netMask;}

将ip转换成数字比较大小

function ipToNumber(ip) {var numbers = ip.split('.');return (parseInt(numbers[0], 10) * 256 * 256 * 256 +parseInt(numbers[1], 10) * 256 * 256 +parseInt(numbers[2], 10) * 256 +parseInt(numbers[3], 10));}