如何从对象数组中获取键值列表 - JavaScript
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how to get a list of key values from array of objects - JavaScript
提问by givehug
Lets say, I have an array of objects like this:
可以说，我有一个这样的对象数组：
var students = [{
name: 'Nick',
achievements: 158,
points: 14730
}, {
name: 'Jordan',
achievements: '175',
points: '16375'
}, {
name: 'Ramon',
achievements: '55',
points: '2025'
}];
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.
我如何遍历它（如果必须的话），以便我获得某些关键值的列表。让我们说一个所有名字的列表。
Thanks.
谢谢。
回答by Nina Scholz
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, undefinedwill be returned.
你可以带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一些东西。如果没有设置，undefined将被退回。
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>回答by n-dru
Using forEach:
使用forEach：
var a = [];
students.forEach(function(obj){
a.push(obj.name);
})
console.log(a);
Output:
输出：
["Nick", "Jordan", "Ramon"]
