如何大写Javascript对象键？

Question

有人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

截至 2019 年，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);