javascript - 如何对两个json对象键的值求和？

Question

这个问题在这里已经有了答案:





Better way to sum a property value in an array

(19 个回答)


2个月前关闭。

"bills": [
    {
        "refNo": 17,
        "billDate": "1-apr-2016",
        "dueDate": "30-apr-2016",
        "pendingAmount": 4500,
        "overdueDays": 28
    },
    {
        "refNo": 20,
        "billDate": "15-apr-2016",
        "dueDate": "3-may-2016",
        "pendingAmount": 56550,
        "overdueDays": 15
    }
]

我想总结“pendingAmount”字段。
它应该像 pendingAmount: 61050 一样返回

Answer 1

您可以使用Array#map然后 Array#reduce展平你的对象，然后总结 map 的结果:

bills.map(bill => bill.pendingAmount).reduce((acc, amount) => acc + amount);

这是一个片段:

var bills = [
          {
            "refNo": 17,
            "billDate": "1-apr-2016",
            "dueDate": "30-apr-2016",
            "pendingAmount": 4500,
            "overdueDays": 28
          },
          {
            "refNo": 20,
            "billDate": "15-apr-2016",
            "dueDate": "3-may-2016",
            "pendingAmount": 56550,
            "overdueDays": 15
          }
        ];
var res = bills.map(bill => bill.pendingAmount).reduce((acc, amount) => acc + amount);
console.log(res)

希望能帮助到你，
此致，