ES6计算(动态)属性名称 [英] ES6 Computed (dynamic) property names

问题描述

我正在阅读此说明，以便更好地理解ES6 .

I am reading this explanation in order to get a better understanding of ES6.

在增强对象文字方面，它是作为示例代码给出的:

In the bit about Enhanced Object Literals, this is given as example code:

var obj = {
    ... (removed as not relevant) ...

    // Computed (dynamic) property names
    [ 'prop_' + (() => 42)() ]: 42
};

除了最后一句话，我了解发生了什么

I understand what is happening except for the last sentence

我明白了

: 42

是要赋予属性的值(数字)，并且是

Is the value (Number) that will be given to the property, and that

[ 'prop_' + ... ]

是以字符串 prop _ 开头的动态变量名.

Is a dynamic variable name that starts with the string prop_.

但是，这是什么意思呢?

However, what does this mean/do?

(() => 42)()

推荐答案

(() => 42)()是使用 查看全文