循环浏览json时更改密钥

is it possible to change the key when looping through objects with an external variable. Imagine it like that:

是否可以在使用外部变量循环对象时更改密钥。想象一下:

var data = [{
    "id": 1,
    "name": "Simon",
    "age": 13
}, {
    "id": 2,
    "name": "Helga",
    "age": 18
}, {
    "id": 3,
    "name": "Tom",
    "age": 27
}, ]

var key = name;

for (var i = 0; i < data.length; i++) {
    var output = data[i].key;
}

But this, of course, ends up with an undefined output. Goal is to build a function which can handle different loops.

但是,这当然会导致未定义的输出结果。目标是构建一个可以处理不同循环的函数。

2 个解决方案

#1

You can access objects in JavaScript just like you do with arrays. Here is the code you are looking for.

您可以像使用数组一样访问JavaScript中的对象。这是您要寻找的代码。

var data = [{
    "id": 1,
    "name": "Simon",
    "age": 13
}, {
    "id": 2,
    "name": "Helga",
    "age": 18
}, {
    "id": 3,
    "name": "Tom",
    "age": 27
}, ]

var key = "name";

for (var i = 0; i < data.length; i++) {
    var output = data[i][key];
}

In reference to the other answer (which appears to have been deleted) I wouldn't recommend using foreach because it is not supported in Internet Explorer 8.

在参考其他答案(似乎已被删除)时,我不建议使用foreach,因为Internet Explorer 8不支持它。

However, you could use:

但是,您可以使用:

var key = "name";

for (var i in data) {
  if(data.hasOwnProperty(i))
  {
    var output = data[i][key];
  }
}

#2

I believe you need a function like this:

我相信你需要这样的功能:

function handleKey(objectArray, key) {
    for (var index in objectArray) {
        //do something with objectArray[index][key]
    }
}

Call this function like this: handleKey(data, "name")

像这样调用这个函数:handleKey(data,“name”)

The function handles the key attributes of an object array. You can customize this further based on needs, I decided to be short to keep it simple.

该函数处理对象数组的关键属性。你可以根据需要进一步定制,我决定保持简单。

#1