在JS中获取具有未知单个键的对象的值 [英] Get the value of an object with an unknown single key in JS

问题描述

如何获取具有未知单个键的对象的值？

How can I get the value of an object with an unknown single key?

示例：

var obj = {dbm: -45}

我想要得到-45值而不知道它的关键。

I want to get the -45 value without knowing it's key.

我知道我可以遍历对象键（总是一个）。

I know that I can loop over the object keys (which is always one).

for (var key in objects) {
    var value = objects[key];
}

但我想知道是否有更清洁的解决方案？

But I would like to know if there is a cleaner solution for this?

推荐答案

Object.keys可能是一个解决方案：

Object.keys might be a solution:

Object.keys({ dbm: -45}); // ["dbm"]

for-in和Object.keys之间的差异就是Object。 keys返回所有自己的键名，for-in可用于迭代对象的所有自己和继承的键名。

The differences between for-in and Object.keys is that Object.keys returns all own key names and for-in can be used to iterate over all own and inherited key names of an object.

正如James Brierley在下面评论的那样你可以分配一个以这种方式对象的未知属性：

As James Brierley commented below you can assign an unknown property of an object in this fashion:

var obj = { dbm:-45 };
var unkownKey = Object.keys(obj)[0];
obj[unkownKey] = 52;

但是你必须记住，分配一个Object.keys按某种顺序返回键名的属性可能容易出错。

But you have to keep in mind that assigning a property that Object.keys returns key name in some order of might be error-prone.

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