Question

我有一个像这样的对象：

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <fstream>
using namespace std;
inline void keep_window_open() {char ch; cin>>ch;}

int main()
{
    string line;
    ifstream myfile("weblog.txt");
    vector<string> fileLines;

    //stack overflow example
    if (!myfile) //test the file
    {
        cout << "Unable to open the file" << endl;
        return 0;
    }

    while (getline(myfile, line))
    {
        fileLines.push_back(line);
        //cout << line << '\n';
    }

    sort(fileLines.begin(), fileLines.end()); //sorting string vector

    for (string &s : fileLines)
    {
        cout << s << " ";
        ofstream newfile ("newfile.txt");
        newfile << s << " ";
    };

    return 0;
}

我想将var obj1 = [{ first : 1, second : 2 }, {third : 3, fourth : 4}, {fifth : 5, sixth : 6}];和keys分成2个不同的values，以便结果应为

arrays

我试过了：

var labels = [first, second, third, fourth, fifth, sixth];
var values = [1,2,3,4,5,6];

但结果是

var labels = [];
var values = [];
for(var key in obj1[0]){
    labels.push(key);
    values.push(obj1[0][key]);
}

我知道这是因为我只迭代labels = ["first","second"]; values = [1,2];索引位置。任何人都可以建议我实现预期产出的方法。

Answer 1

试试这个

＆＃13;

var obj1 = [{ first : 1, second : 2 },
            {third : 3, fourth : 4},
            {fifth : 5, sixth : 6}]; 

var key=[];
var value=[];
obj1.forEach(function(item){
 
  for(i in item)
  {
    key.push(i);
    value.push(item[i]);
  }
   
});

console.log(key);
console.log(value);

＆＃13;

Answer 2

for (var i = 0; i < obj1.length; i++) {
    for (var key in obj1[i]) {
        labels.push(key);
        values.push(obj1[i][key]);
    }
}

从对象中分离键和值

2 个答案: