JSON到JSON转换：展平

Question

我怎样才能从

获得

data1 = [
    { "label": "Some Label", "value": '018'},
    { "label": "Another Label", "value": '020'}
] 

到

data2 = {
    "018": "Some Label",
    "020": "Another Label"
}

for循环应该怎么样？

for (let item of data){
    ....
}

Answer 1

您可以使用reduce()并返回对象。

var data = [
 { "label": "Some Label", "value": '018'},
 { "label": "Another Label", "value": '020'}
] 

var result = data.reduce(function(r, e) {
  r[e.value] = e.label;
  return r;
}, {})

console.log(result)

Answer 2

您可以使用Array#forEach并构建一个值为关键字的对象。

var data1 = [{ label: "Some Label", value: '018'}, { label: "Another Label", value: '020'}],
    data2 = {};

data1.forEach(function (a) {
    data2[a.value] = a.label;
});

console.log(data2);

Answer 3

如果你想坚持使用for..of循环，你可以这样做：

var data2 = {};

for (let item of data) {
  data2[item.value] = item.label
}

Answer 4

试试这个......

var data1 = [{
  "label": "Some Label",
  "value": '018'
}, {
  "label": "Another Label",
  "value": '020'
}];
var data2 = {};
for (i = 0; i <= data1.length - 1; i++) {
  data2[data1[i].value] = data1[i].label;
}
console.log(data2);

Answer 5

试试这个，它应该可以正常工作

/** declare data1 */
const data1 = [
  {
    label: 'Some Label',
    value: '018'
  }, 
  {
    label: 'Another Label',
    value: '020'
  }
]

/** declare data2 */
const data2 = {}
    
/** loop data1 to get data2 value */
data1.forEach(item => {
  data2[item.value] = item.label
})

console.log(data2)