如何动态创建JavaScript数组（JSON格式）？ [英] How do I create JavaScript array (JSON format) dynamically?

问题描述

我正在尝试创建以下内容：

I am trying the create the following:

var employees = {"accounting": [   // accounting is an array in employees.
                    { "firstName" : "John",  // First element
                      "lastName"  : "Doe",
                      "age"       : 23 },

                    { "firstName" : "Mary",  // Second Element
                      "lastName"  : "Smith",
                      "age"       : 32 }
                  ] // End "accounting" array.                                  

    } // End Employees

我开始于

 var employees = new Array();

如何动态继续创建数组（可能会更改 firstName 带变量）？我似乎没有得到正确的嵌套数组。

How do I continue to create the array dynamically (might change firstName with variable)? I don't seem to get the nested array right.

推荐答案

我们的对象数组

var someData = [
   {firstName: "Max", lastName: "Mustermann", age: 40},
   {firstName: "Hagbard", lastName: "Celine", age: 44},
   {firstName: "Karl", lastName: "Koch", age: 42},
];

with ... in

with for...in

var employees = {
    accounting: []
};

for(var i in someData) {    

    var item = someData[i];   

    employees.accounting.push({ 
        "firstName" : item.firstName,
        "lastName"  : item.lastName,
        "age"       : item.age 
    });
}

或 Array.prototype.map（），更清洁：

var employees = {
    accounting: []
};

someData.map(function(item) {        
   employees.accounting.push({ 
        "firstName" : item.firstName,
        "lastName"  : item.lastName,
        "age"       : item.age 
    });
}

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