javascript - 转换为键值对

Question

这是我的对象

    const upToPaidCost = [ { 'Labour Cost': '54000' }, { 'Material Cost': '24900' } ];
    let arr = [];


    for (const [key, value] of Object.entries(...upToPaidCost)) {
        arr.push({ key: key, value: value });
    }
    console.log(upToPaidCost)
    console.log(arr);

预期输出:

    [
        {
          key: "Labour Cost",
          value: 54000
        },
        {
          key: "Material Cost",
          value: 24900
        }
    ]

它只显示第一个键值，第二个键值丢失，我在这里做错了什么？

Answer 1

问题是，Object.entries 采用单个对象，而您有一个对象数组。这就是为什么你需要两个循环:

const upToPaidCost = [ { 'Labour Cost': '54000' }, { 'Material Cost': '24900' } ];
let arr = [];


for (const obj of upToPaidCost) {
    for (const [key, value] of Object.entries(obj)) {
        arr.push({key, value});
    }
}

console.log(arr);

或两个嵌套的map:

arr = upToPaidCost.flatMap(obj =>
    Object.entries(obj).map(([key, value]) => ({key, value})))