如何从对象数组中获取键值列表-JavaScript [英] how to get a list of key values from array of objects - JavaScript

问题描述

可以说，我有一个这样的对象数组:

Lets say, I have an array of objects like this:

var students = [{
    name: 'Nick',
    achievements: 158,
    points: 14730
}, {
    name: 'Jordan',
    achievements: '175',
    points: '16375'
}, {
    name: 'Ramon',
    achievements: '55',
    points: '2025'
}];

如何循环遍历(如果需要)，以便获得某些键值的列表. 让我们说出所有名称的列表.

How do I loop through it (if i have to) so I get a list of certain key values. Lets say a list of all names.

谢谢.

推荐答案

您可以使用Array.map().此方法返回一个数组，其中包含返回的回调中的元素.它期望所有元素都返回某些东西.如果未设置，将返回undefined.

You can take Array.map(). This method returns an array with the elements from the callback returned. It expect that all elements return something. If not set, undefined will be returned.

var students = [{
    name: 'Nick',
    achievements: 158,
    points: 14730
}, {
    name: 'Jordan',
    achievements: '175',
    points: '16375'
}, {
    name: 'Ramon',
    achievements: '55',
    points: '2025'
}];
var nameArray = students.map(function (el) { return el.name; });
document.getElementById('out').innerHTML = JSON.stringify(nameArray, null, 4);

<pre id="out"></pre>

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