找不到变量：URLSearchParams [英] Can't find variable: URLSearchParams

问题描述

在React Native中，我想对URLSearchParams进行抽象，所以我写了这个类：

In React Native, I would like to do an abstraction of URLSearchParams so I write this class:

export class HttpSearchParamsAdapter extends URLSearchParams implements HttpSearchParams {

constructor() {
    super();
}

set(param: string, val: string): void {
    super.set(param, val);
    }
}

但是当我构建应用程序时，我有这个错误：找不到变量：URLSearchParams。我使用es6中的URLSearchParams。

But when I build the app, I have this error: Can't find variable: URLSearchParams. I use URLSearchParams from es6.

推荐答案

正如mrgoos所说， URLSearchParams 是在使用 JavaScript Core 的iOS中不支持，您可以向React Native添加polyfill。

As mrgoos said, URLSearchParams is not supported in iOS which uses JavaScript Core, you can add a polyfill to React Native.

例如，我在使用 wretch 时出现问题，所以我在全球使用这种polyfill： url-search-params-polyfill

For example, I had a problem using wretch, so I used this polyfill globally: url-search-params-polyfill

// index.js
import 'url-search-params-polyfill';

UPDATE（对于React Native 0.59）

在React Native 0.59中，开发人员实现 URLSearchParams 的一些方法，并带有抛出新错误（'未实现' ）; 所以...它很糟糕。

In React Native 0.59, the developers "implemented" some methods of URLSearchParams with throw new Error('not implemented'); so... it miserably fails.

你可以在这里阅读这个问题： https://github.com/facebook/react-native/issues/23922

You can read the issue here: https://github.com/facebook/react-native/issues/23922

我们可以使用 whatwg-url 实现和缓冲区包而不是我使用的polyfill。在此解释： https://github.com/facebook/react-native / issues / 23922 #issicecomment-476070032

Instead of the polyfill I used, we can use whatwg-url implementation and the buffer package as explained here: https://github.com/facebook/react-native/issues/23922#issuecomment-476070032

// index.js
import { URL, URLSearchParams } from 'whatwg-url';
import { Buffer } from 'buffer';

// react-native 0.59 added its own global URLSearchParams without implementation...
// https://github.com/facebook/react-native/blob/e6057095adfdc77ccbbff1c97b1e86b06dae340b/Libraries/Blob/URL.js#L66
// Issue: https://github.com/facebook/react-native/issues/23922
global.Buffer = Buffer;
global.URL = URL;
global.URLSearchParams = URLSearchParams;

这篇关于找不到变量：URLSearchParams的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！