{app，BrowserWindow}在JavaScript（node.js）中是什么意思？ [英] What does {app, BrowserWindow} means in JavaScript (node.js)?

问题描述

在阅读使用 electron 制作软件的文档时，我在<$开头遇到了这类代码c $ c> index.js 文件（通常开始执行的文件）

While reading docs of making softwares with electron, I came across this type of code in the beginning of index.js file (the file where generally execution starts)

const {app, BrowserWindow} = require('electron')

{app， BrowserWindow} （语法，而不是关键字）的真正含义是？是JavaScript语法，还是node.js事物，还是与电子专有相关的事物？

What does {app, BrowserWindow} (the syntax, not the keywords) really means? Is it a JavaScript syntax, or a node.js thing or something exclusively related to electron?

推荐答案

这种语法称为对象解构，这是最新版本的JavaScript（JavaScript2015 aka ECMAScript 6 / ES6）的功能- app 和 BrowserWindow 只是您要在应用程序的此部分中使用的电子的特定部分。

This syntax is called 'object destructuring', and it is a feature of the latest version of JavaScript (JavaScript2015 aka ECMAScript 6/ES6) - app and BrowserWindow are just particular parts of electron that you want to use in this portion of your application.

这是一个简化代码并轻松引用依赖项的关键部分的方法。

It's a way to simplify your code and to easily reference critical parts of a dependency.

这是 https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment

var o = {p: 42, q: true};
var {p, q} = o;

console.log(p); // 42
console.log(q); // true

因此，在您的情况下， electron 是一个导入的模块，看起来像这样（再次，这里过于简化）：

So in your case, electron is an imported module that would look something like (again, a gross oversimplification here):

var electron = {
    app: {
        greet: () => {
            console.log("Hello, world!")
        }
    },
    BrowserWindow: {/* some other stuff */},
    anotherMethod: {/* other stuff, which we will ignore in your app */}
}

module.exports electron

然后在您的应用程序中，导入此模块，然后可以直接引用导入的属性：

Then in your app, you import this module and you can reference the imported attributes directly:

const {app, BrowserWindow} = require('electron')

app.greet()
// "Hello, world!"

类似地，您可以引用 BrowserWindow 。 ..但是，您不能在未将 otherMethod 包含在解构分配中的情况下对其进行引用。

And similarly, you can reference BrowserWindow... however, you couldn't reference anotherMethod without including it in the destructuring assignment.

希望有帮助。

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