javascript - 如何修改json中的key？

Question

如何修改JSON中的key?

let obj = {  A: '1A',  B: '1B',}for (let k in obj) {  if (k == 'A') {    obj[k] = obj[k].replace(k, 'F')    k = 'F'  }}console.log('新的obj', obj)

打印出来的结果是key没改成功，value修改成功了

我想要的结果是

newObj = {  F: '1F',  B: '1B',}

Answer 1

let obj = {  A: '1A',  B: '1B',};if (obj.hasOwnProperty('A')) {  obj['F'] = obj['A'];  delete obj['A'];}console.log(obj);  // { F: '1A', B: '1B' }

Answer 2

方式1:

let obj = {  A: '1A',  B: '1B',};let newObj = {};for (let k in obj) {  if (k === 'A') {    newObj['F'] = obj[k];  } else {    newObj[k] = obj[k];  }}console.log('新的obj', newObj);

方式2:

let obj = {  A: '1A',  B: '1B',};console.log('新的obj', JSON.parse(JSON.stringify(obj).replace(/A/g, "F")));