如何在React JS中创建全局可访问变量

问题描述

在我的react JS应用中，我进行了许多API调用，

In my react JS app, I make many API calls,

无需指定:const BASE_URL =' https://apiurlgoeshere.com/'

Rather than having to specify:const BASE_URL = 'https://apiurlgoeshere.com/'

在每个页面上，我都希望在整个应用程序中都可以访问BASE_URL，所以我可以只执行BASE_URL + API_CALL

on every page, I'd rather have BASE_URL accessible throughout the entire application, so I can just do BASE_URL + API_CALL for example

推荐答案

如果这只是添加 BASE_URL ，则可以通过在 constants.js 文件并从那里导出.但是，这使我们每次发出网络请求时都执行 BASE_URL +"something" ，这也不是很理想.另外，在某些情况下，可能还必须共享其他配置，例如必须将通用标头添加到所有请求中.

If this is just adding BASE_URL, then this can be achieved by declaring it inside a constants.js file and exporting it from there. But then, that makes us do BASE_URL + "something" each time we make a network request which isn't really ideal either. Also there might be some scenarios where other configuration have to be shared, like say, a common header that has to be added to all the requests.

为解决此问题，大多数请求库都具有内置解决方案.如果我们选择 axios 作为最受欢迎的浏览器，则可以创建实例，例如:

To solve this, most request libraries have in-build solutions. If we are choosing axios as the most popular one, we can create a instance like:

const instance = axios.create({
  baseURL: 'https://some-domain.com/api/',
  timeout: 1000,
  headers: {'X-Custom-Header': 'foobar'}
});
export default instance;

并将其导入到 axios 的任何地方，例如:

and import this everywhere the axios is going to be used like:

import axios from "./axios-instance";

假设 axios-instance.js 是创建实例的文件.现在，您可以跳过将 BASE_URL 添加到实例中已提供的每个请求中.

assuming axios-instance.js is the file where the instance is created. Now you can skip adding the BASE_URL to every request as it is already provided in the instance.

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