Question

任何人都知道转这个的好方法吗？：

var obj = [{key1: value1,key2: value2},{key3: value3,key4: value4}];

成：

var obj = [{Key1: value1,Key2: value2},{Key3: value3,Key4: value4}];

Answer 1

循环删除并替换：

var obj = [{key1: 1,key2: 1},{key3: 1,key4: 1}];
for(var i = 0; i<obj.length;i++) {

    var a = obj[i];
    for (var key in a) {
        var temp; 
        if (a.hasOwnProperty(key)) {
          temp = a[key];
          delete a[key];
          a[key.charAt(0).toUpperCase() + key.substring(1)] = temp;
        }
    }
    obj[i] = a;

}

Answer 2

从2019年开始，您可以使用Object.fromEntries：

let populations = {london: 8.9, beijing: 21.54, mumbai: 18.41};  // March 2020

let entries = Object.entries(populations);
let capsEntries = entries.map((entry) => [entry[0][0].toUpperCase() + entry[0].slice(1), entry[1]]);
let capsPopulations = Object.fromEntries(capsEntries);

console.log(capsPopulations);

Answer 3

implementation 'pull-parser:pull-parser:2.1.10'

Answer 4

如果您只需要大写首字母，您可以使用 Jeremiah's answer

或者如果您需要将每个单词的首字母大写，请考虑以下内容

let populations = {"london": 8.9, "beijing": 21.54, "mumbai": 18.41, "new york": 19.4};
let entries = Object.entries(populations);
// Capitalize first letter of each word 
let capsEntries = entries.map((entry) => [entry[0].replace(/(^\w{1})|(\s+\w{1})/g, letter => letter.toUpperCase()), entry[1]]);
let capsPopulations = Object.fromEntries(capsEntries);

console.log(capsPopulations)

从 this answer 中采用的正则表达式

正则表达式解释：

(^\w{1})：匹配字符串的第一个字符
|：或
(\s{1}\w{1})：匹配一个空格后的字符
g：匹配所有
match => match.toUpperCase(): 替换为 can take 函数，所以；用大写匹配替换匹配

Answer 5

另一种方法（更干净）

import * as _ from 'lodash';

function capitalizeObjectKeys(obj) { 返回 _.transform(obj, (result, val, key) => { 结果[key.charAt(0).toUpperCase() + key.slice(1)] = val; }); }

https://stackblitz.com/edit/js-hsqutg?embed=1&file=index.js

Answer 6

使用lodash的_.capitalize函数

_.capitalize('firstName') => FirstName

如何大写Javascript对象键？

6 个答案: