我一直在设计一个程序，以帮助使子网网络的任务变得更加容易。现在，支持要做的就是搜索数组并拉出与用户定义的属性相匹配的对象。目前，我遇到的问题是，无论用户选择什么，都只选择数组中的第一个对象。
注意：此外，每当我为“子网”输入大于1的值时，它就会给出我的错误280. A类是唯一一个甚至可以正常工作的。
所以，如果有人知道我如何正确搜索我想要的对象（不仅是“子网”，还有其他3个选项），我该如何做？
我道歉，这段代码很残忍，有很多瑕疵！我无法绕过我做错了什么，也不知道如何解决它。我只编程了几个月，这是我迄今为止最大的项目。
请测试一下，看看我做错了什么。我使用的主要测试环境是Codecademy的JavaScript解释器。
感谢大家提出的任何建议或解决方案！
//This program was developed by N1njaMDN.
//This program's purpose is to help assist with subnetting.
/*This section of the code is designated to holding all the subnet information.
All of the data is put into an object in the format of
{subNumA:#,
subNumB:#,
subNumC:#,
hostNum:#,
BlockSize:#,
customSubMask:"#.#.#.#"}
*/
/*To find block size, we subtract (the first portion of the custom subnet mask from the left that isnt a 255)
from 256. Example: in 255.192.168.1, we would do 256-192. This number is our block size.*/
var objects = [
{
cidr:8,
subNumA:1,
subNumB:0,
subNumC:0,
hostNum:16777214,
blockSize:256,
customSubMask:"255.0.0.0"
},
{
cidr:9,
subNumA:2,
subNumB:0,
subNumC:0,
hostNum:8388608,
blockSize:128,
customSubMask:"255.128.0.0"
},
{
cidr:10,
subNumA:4,
subNumB:0,
subNumC:0,
hostNum:4194304,
blockSize:64,
customSubMask:"255.192.0.0"
},
{
cidr:11,
subNumA:8,
subNumB:0,
subNumC:0,
hostNum:2097152,
blockSize:32,
customSubMask:"255.224.0.0"
},
{
cidr:12,
subNumA:16,
subNumB:0,
subNumC:0,
hostNum:1048576,
blockSize:16,
customSubMask:"255.240.0.0"
},
{
cidr:13,
subNumA:32,
subNumB:0,
subNumC:0,
hostNum:524288,
blockSize:8,
customSubMask:"255.248.0.0"
},
{
cidr:14,
subNumA:64,
subNumB:0,
subNumC:0,
hostNum:262144,
blockSize:4,
customSubMask:"255.252.0.0"
},
{
cidr:15,
subNumA:128,
subNumB:0,
subNumC:0,
hostNum:131072,
blockSize:2,
customSubMask:"255.254.0.0"
},
{
cidr:16,
subNumA:256,
subNumB:1,
subNumC:0,
hostNum:65536,
blockSize:256,
customSubMask:"255.255.0.0"
},
{
cidr:17,
subNumA:512,
subNumB:2,
subNumC:0,
hostNum:32768,
blockSize:128,
customSubMask:"255.255.128.0"
},
{
cidr:18,
subNumA:1024,
subNumB:4,
subNumC:0,
hostNum:16384,
blockSize:64,
customSubMask:"255.255.192.0"
},
{
cidr:19,
subNumA:2048,
subNumB:8,
subNumC:0,
hostNum:8192,
blockSize:32,
customSubMask:"255.255.224.0"
},
{
cidr:20,
subNumA:4096,
subNumB:16,
subNumC:0,
hostNum:4096,
blockSize:16,
customSubMask:"255.255.240.0"
},
{
cidr:21,
subNumA:8192,
subNumB:32,
subNumC:0,
hostNum:2048,
blockSize:8,
customSubMask:"255.255.248.0"
},
{
cidr:22,
subNumA:16384,
subNumB:64,
subNumC:0,
hostNum:1024,
blockSize:4,
customSubMask:"255.255.252.0"
},
{
cidr:23,
subNumA:32768,
subNumB:128,
subNumC:0,
hostNum:512,
blockSize:2,
customSubMask:"255.255.254.0"
},
{
cidr:24,
subNumA:65536,
subNumB:256,
subNumC:1,
hostNum:256,
blockSize:256,
customSubMask:"255.255.255.0"
},
{
cidr:25,
subNumA:131072,
subNumB:512,
subNumC:2,
hostNum:128,
blockSize:128,
customSubMask:"255.255.255.128"
},
{
cidr:26,
subNumA:262144,
subNumB:1024,
subNumC:4,
hostNum:64,
blockSize:64,
customSubMask:"255.255.255.192"
},
{
cidr:27,
subNumA:524288,
subNumB:2048,
subNumC:8,
hostNum:32,
blockSize:32,
customSubMask:"255.255.255.224"
},
{
cidr:28,
subNumA:1048576,
subNumB:4096,
subNumC:16,
hostNum:16,
blockSize:16,
customSubMask:"255.255.255.240"
},
{
cidr:29,
subNumA:2097152,
subNumB:8192,
subNumC:32,
hostNum:8,
blockSize:8,
customSubMask:"255.255.255.248"
},
{
cidr:30,
subNumA:4194304,
subNumB:16384,
subNumC:64,
hostNum:4,
blockSize:4,
customSubMask:"255.255.255.252"
},
{
cidr:31,
subNumA:8388608,
subNumB:32768,
subNumC:32,
hostNum:2,
blockSize:2,
customSubMask:"255.255.255.254"
}
];
var classGiven = prompt("What is the class of your given network address?").toLowerCase();
var addressGiven = prompt("What is your given network address?");
var userChoice = prompt("What is your given information? ('subnets', 'hosts', 'subnets & hosts', or just a 'network address'?) Type your answer based on what is between the quotes.");
switch(userChoice) {
//This section is for showing info based on number of subnets only.
case 'subnets':
var subnetsNeeded = prompt("How many subnets do you need?");
switch(classGiven) {
//This is only for class A subnets.
case 'a':
function getObjectsAsub(subnetsNeeded) {
var obj, i, il;
for (i = 0, il = objects.length; i < il; i++) {
if (objects[i].subNumA >= subnetsNeeded) {
obj = objects[i];
break;
} else {
console.log("Something went wrong! error280");
break;
}
}
var objectArrayTwo = obj;
console.log(obj);
}
getObjectsAsub(subnetsNeeded);
break;
//This is only for class B subnets.
case 'b':
function getObjectsBsub(subnetsNeeded) {
var obj, i, il;
for (i = 0, il = objects.length; i < il; i++) {
if (objects[i].subNumB >= subnetsNeeded) {
obj = objects[i];
break;
} else {
console.log("Something went wrong! error298");
break;
}
}
var objectArrayTwo = obj;
console.log(obj);
}
getObjectsBsub(subnetsNeeded);
break;
//This is only for class C subnets.
case 'c':
function getObjectsCsub(subnetsNeeded) {
var obj, i, il;
for (i = 0, il = objects.length; i < il; i++) {
if (objects[i].subNumC >= subnetsNeeded) {
obj = objects[i];
break;
} else {
console.log("Something went wrong! error316");
break;
}
}
var objectArrayTwo = obj;
console.log(obj);
}
getObjectsCsub(subnetsNeeded);
break;
//This is the default case.
default:
console.log("Something went wrong! error327");
break;
}
break;
//This section is for showing info based on number of hosts only.
case 'hosts':
var hostsNeeded = parseInt(prompt("How many hosts do you need?"));
var exactHostsNeeded = hostsNeeded + 2;
function getObjectsHost(exactHostsNeeded) {
var obj, i, il;
for (i = 0, il = objects.length; i < il; i++) {
if (objects[i].hostNum >= exactHostsNeeded) {
obj = objects[i];
break;
} else {
console.log("Something went wrong! error342");
break;
}
}
var objectArrayTwo = obj;
console.log(obj);
}
getObjectsHost(exactHostsNeeded);
break;
//This section is for showing info based on number of subnets and hosts only.
case 'subnets & hosts':
var subnetsNeeded = parseInt(prompt("How many subnets do you need?"));
var hostsNeeded = parseInt(prompt("How many hosts do you need?"));
var exactHostsNeeded = hostsNeeded + 2;
switch(classGiven) {
//This is only for class A subnets.
case 'a':
function getObjectsA(exactHostsNeeded, subnetsNeeded) {
var obj, i, il;
for (i = 0, il = objects.length; i < il; i++) {
if ((objects[i].hostNum >= exactHostsNeeded) && (objects[i].subNumA >= subnetsNeeded)) {
obj = objects[i];
break;
} else {
console.log("Something went wrong! error366");
break;
}
}
var objectArrayTwo = obj;
console.log(obj);
}
getObjectsA(exactHostsNeeded, subnetsNeeded);
break;
//This is only for class B subnets.
case 'b':
function getObjectsB(exactHostsNeeded, subnetsNeeded) {
var obj, i, il;
for (i = 0, il = objects.length; i < il; i++) {
if ((objects[i].hostNum >= exactHostsNeeded) && (objects[i].subNumB >= subnetsNeeded)) {
obj = objects[i];
break;
} else {
console.log("Something went wrong! error384");
break;
}
}
var objectArrayTwo = obj;
console.log(obj);
}
getObjectsB(exactHostsNeeded, subnetsNeeded);
break;
//This is only for class C subnets.
case 'c':
function getObjectsC(hexactHostsNeeded, subnetsNeeded) {
var obj, i, il;
for (i = 0, il = objects.length; i < il; i++) {
if ((objects[i].hostNum >= exactHostsNeeded) && (objects[i].subNumC >= subnetsNeeded)) {
obj = objects[i];
break;
} else {
console.log("Something went wrong! error402");
break;
}
}
var objectArrayTwo = obj;
console.log(obj);
}
getObjectsC(exactHostsNeeded, subnetsNeeded);
break;
//This is the default case.
default:
console.log("Something went wrong! error413");
break;
}
break;
//This section is the default for the main switch!
default:
console.log("Something went wrong! error419");
break;
}
答案 0 :(得分：0)
我会重申我的评论，在外面定义函数并在切换案例中调用它们。
case 'b':
function getObjectsBsub(subnetsNeeded) {
var obj, i, il;
for (i = 0, il = objects.length; i < il; i++) {
if (objects[i].subNumB >= subnetsNeeded) {
obj = objects[i];
break;
}
else {
console.log("Something went wrong! error298");
break;
}
}
var objectArrayTwo = obj;
console.log(obj);
}
getObjectsBsub(subnetsNeeded);
break;
其次，如果你看到你的情况，
for (i = 0, il = objects.length; i < il; i++) {
if (objects[i].subNumB >= subnetsNeeded) {
obj = objects[i];
break;
}
else {
console.log("Something went wrong! error298");
break; // This is why only first object is selected
}
}
我也冒昧地根据我的理解修改功能，
function getObjectsSub(classType, subnetsNeeded) {
var obj;
objects.forEach(function(row){
if(row["subNum" + classType] >= subnetsNeeded){
obj = row;
return;
}
});
if(!obj){
console.log("Something went wrong! error280");
}
var objectArrayTwo = obj;
console.log(obj);
}