使用对象数组

Question

有一个对象数组如下。需要仅使用VatCode propery从跟随的对象数组创建一个数组而不通过'for循环'。 这里的结果应该是
resultArray = [1,15,25]

"Data": [
    {
        "Id": 1,
        "VatCode": 1,
        "Name": "Ingen mva.",            
        "VatAccount": {
            "ID": 3,
            "AccountNo": "3190",
            "Name": "Misc Items Income"
        }            
    },
    {
        "Id": 2,
        "VatCode": 15,
        "Name": "Lav mva.",           
        "VatAccount": {
            "ID": 3,
            "AccountNo": "3190",
            "Name": "Misc Items Income"
        }
    },
    {
        "Id": 3,
        "VatCode": 25,
        "Name": "Høy mva.",           
        "VatAccount": {
            "ID": 3,
            "AccountNo": "3190",
            "Name": "Misc Items Income"
        }
    },

]

Answer 1

Data = //your json data    

this.Data.map(data => data.VatCode);

  

map（）方法创建一个新数组，其中包含调用a的结果   每个数组元素的函数。

var data = [
    {
        "Id": 1,
        "VatCode": 1,
        "Name": "Ingen mva.",            
        "VatAccount": {
            "ID": 3,
            "AccountNo": "3190",
            "Name": "Misc Items Income"
        }            
    },
    {
        "Id": 2,
        "VatCode": 15,
        "Name": "Lav mva.",           
        "VatAccount": {
            "ID": 3,
            "AccountNo": "3190",
            "Name": "Misc Items Income"
        }
    },
    {
        "Id": 3,
        "VatCode": 25,
        "Name": "Høy mva.",           
        "VatAccount": {
            "ID": 3,
            "AccountNo": "3190",
            "Name": "Misc Items Income"
        }
    },

];

var s = data.map(data => data.VatCode);
console.log(s);