如何从React中的cdn/script标签导入javascript包？

Question

我想在React中导入这个javascript包

<script src="https://cdn.dwolla.com/1/dwolla.js"></script>

但是,没有NPM包,所以我不能这样导入它:

import dwolla from 'dwolla'

要么

import dwolla from 'https://cdn.dwolla.com/1/dwolla.js'

所以,当我尝试

dwolla.configure(...)

我得到一个错误,说dwolla是未定义的.我该如何解决这个问题？

谢谢

Answer 1

转到index.html文件并导入脚本

<script src="https://cdn.dwolla.com/1/dwolla.js"></script>

然后,在导入dwolla的文件中,将其设置为变量

const dwolla = window.dwolla;

Answer 2

对于打字稿开发人员

const newWindowObject = window as any;// 将其转换为任何类型

let pushNotification = newWindowObject.OneSignal;// 现在 OneSignal 对象可以在打字稿中访问而不会出现错误

Answer 3

这个问题越来越老了，但我找到了一种使用react-helmet库来解决这个问题的好方法，我觉得它更符合 React 的工作方式。我今天用它来解决一个类似于你的 Dwolla 问题的问题：

import React from "react";
import Helmet from "react-helmet";

export class ExampleComponent extends React.Component {
    constructor(props) {
        super(props);

        this.state = {
            myExternalLib: null
        };

        this.handleScriptInject = this.handleScriptInject.bind(this);
    }

    handleScriptInject({ scriptTags }) {
        if (scriptTags) {
            const scriptTag = scriptTags[0];
            scriptTag.onload = () => {
                // I don't really like referencing window.
                console.log(`myExternalLib loaded!`, window.myExternalLib);
                this.setState({
                    myExternalLib: window.myExternalLib
                });
            };
        }
    }

    render() {
        return (<div>
            {/* Load the myExternalLib.js library. */}
            <Helmet
                script={[{ src: "https://someexternaldomain.com/myExternalLib.js" }]}
                // Helmet doesn't support `onload` in script objects so we have to hack in our own
                onChangeClientState={(newState, addedTags) => this.handleScriptInject(addedTags)}
            />
            <div>
                {this.state.myExternalLib !== null
                    ? "We can display any UI/whatever depending on myExternalLib without worrying about null references and race conditions."
                    : "myExternalLib is loading..."}
            </div>
        </div>);
    }
}

使用this.state意味着 React 将自动监视 myExternalLib 的值并适当地更新 DOM。

信用：https : //github.com/nfl/react-helmet/issues/146#issuecomment-271552211