反應警報未捕獲的不變違規

Question

我在安裝react-alert時遇到了一些問題，它顯示的錯誤就像

react-dom.development.js:55 Uncaught Invariant Violation: Objects are not valid as a React child (found: object with keys {$$typeof, render}). If you meant to render a collection of children, use an array instead.

所以我在cmd中運行命令npm install react-alert react-alert-template-basic react-transition-group

這就是我的App.js的樣子。

import React, { Component, Fragment } from 'react';
import ReactDOM from 'react-dom';

import { Provider as AlertProvider } from 'react-alert';
import AlertTemplate from 'react-alert-template-basic';

import Header from './layout/Header';
import Dashboard from './leads/Dashboard';
import Alerts from './layout/Alerts';

import { Provider } from 'react-redux';
import store from '../store';

const alertOptions = {
    timeout: 3000,
    position: "top center"
};

class App extends Component {
    render() {
        return (
            <Provider store={store}>
                <AlertProvider template={AlertTemplate} {...alertOptions}>
                    <Fragment>
                        <Header />
                        <Alerts />
                        <div className="container">
                            <Dashboard />
                        </div>
                    </Fragment>
                </AlertProvider>
            </Provider>
        )
    }
}

ReactDOM.render(<App />, document.getElementById('app'));

我添加了組件Alers.js，它看起來像。

import React, { Component, Fragment } from 'react';
import { withAlert } from 'react-alert';

export class Alerts extends Component {
    componentDidMount() {
        this.props.alert.show("It works");
    }

    render() {
        return <Fragment />;
    }
}

export default withAlert(Alerts);

所以在Alert.js中，我添加了componentDidMount（）來測試這是否有效（顯然不是）。 如果我從App.js中刪除<Alerts /> ，我沒有任何錯誤，但警報不能以這種方式工作。

Answer 1

您應該像這樣導入您的組件以使用withAlert HOC：

export default withAlert()(Alerts);