JS 根據子網路遮罩，網關計算出所有的IP範圍

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// 驗證IP的正則var ip_reg = /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;// 驗證子網路遮罩的正則var mask_reg = /^(254|252|248|240|224|192|128|0)\.0\.0\.0|255\.(254|252|248|240|224|192|128|0)\.0\.0|255\.255\.(254|252|248|240|224|192|128|0)\.0|255\.255\.255\.(254|252|248|240|224|192|128|0)$/;// IP轉二進位function ip_to_binary(ip){    if (ip_reg.test(ip)) {        var ip_str = "",            ip_arr = ip.split(".");        for (var i = 0; i < 4; i++) {            curr_num = ip_arr[i];            number_bin = parseInt(curr_num);            number_bin = number_bin.toString(2);            count = 8 - number_bin.length;            for (var j = 0; j < count; j++) {                number_bin = "0" + number_bin;            }            ip_str += number_bin;        }        return ip_str;    }    return ‘‘;}// 二進位轉IPfunction binary_to_ip(binary){    if (binary.length == 32) {        a = parseInt(binary.substr(0, 8), 2);        b = parseInt(binary.substr(8, 8), 2);        c = parseInt(binary.substr(16, 8), 2);        d = parseInt(binary.slice(-8), 2);        return a + ‘.‘ + b + ‘.‘ + c + ‘.‘ + d;    }    return ‘‘;}// 根據子網路遮罩和網關計算出IP範圍（網路地址 - 廣播位址）function get_network_broadcast_addr(mask, ip){    network_broadcast = [];    network_addr = "";        mask_arr = mask.split(".");    ip_arr = ip.split(".");        // 計算IP的網路地址 與(&)運算    for (var i = 0; i < 4; i++) {        number1 = parseInt(mask_arr[i]);        number2 = parseInt(ip_arr[i]);        network_addr += number1 & number2;        if( i < 3 ){            network_addr += ".";        }    }    network_broadcast.push(network_addr);    // 計算廣播位址    // 子掩碼後面有幾個0，就去掉IP地址後幾位再補1    mask_binary = ip_to_binary(mask);    gateway_binary = ip_to_binary(ip);        mask_zero = mask_binary.split(0).length - 1;    one_number = new Array(mask_zero + 1).join(‘1‘); // IP地址後位補1    gateway_hou_wei_bu_yi = gateway_binary.slice(0, -mask_zero) + one_number;    network_broadcast.push(binary_to_ip(gateway_hou_wei_bu_yi));    return network_broadcast;}//  全排列組合演算法（兩兩遞迴組合）function doExchange(doubleArrays){    var len = doubleArrays.length;    if(len >= 2){        var len1 = doubleArrays[0].length;        var len2 = doubleArrays[1].length;        var newlen = len1 * len2;        var temp = new Array(newlen);        var index = 0;        for(var i = 0; i < len1; i++){            for(var j = 0; j < len2; j++){                temp[index] = doubleArrays[0][i] + ‘.‘ + doubleArrays[1][j];                index++;            }        }        var newArray = new Array(len - 1);        for(var i = 2; i < len; i++){            newArray[i - 1] = doubleArrays[i];        }        newArray[0] = temp;        return doExchange(newArray);    } else{        return doubleArrays[0];    }}// 返回所有IPfunction return_ip(network_addr, broadcast_addr, gateway){    range = [];    start = network_addr.split(".");    end = broadcast.split(".");    // range格式為[[192], [168], [0,1,2...254], [0,1,2...254]]    for (var i = 0; i < 4; i++) {        if (start[i] == end[i]) {            range[i] = [start[i]];        } else {            min = Math.min(start[i], end[i]);            max = Math.max(start[i], end[i]);            temp = [];            for (var j = min; j <= max; j++) {                temp.push(j);            }            range[i] = temp;        }    }    ip_list = doExchange(range);    ip_list.shift(); // 去掉網路地址    ip_list.pop(); // 去掉廣播位址    gateway_index = -1;        // 去掉網關    for (var k = 0; k < ip_list.length; k++) {        if (ip_list[k] == gateway) {            gateway_index = k;            break;        }    }    if (gateway_index > -1) {        ip_list.splice(gateway_index, 1);    }    return ip_list;}

 

JS 根據子網路遮罩，網關計算出所有的IP範圍