node.js – 缺少元素的“关键”道具. (ReactJS和TypeScript)

我还添加了import语句
import’bootstrap / dist / css / bootstrap.min.css’;
在Index.tsx中.

有没有办法解决这个问题？

npm start

client/src/Results.tsx
(32,21): Missing "key" prop for element.

该文件如下“Results.tsx”

import * as React from 'react';
 class Results extends React.Component<{},any> {

constructor(props: any) {
    super(props);

    this.state = {
        topics: [],isLoading: false
    };
}

componentDidMount() {
    this.setState({isLoading: truE});

    fetch('http://localhost:8080/topics')
        .then(response => response.json())
        .then(data => this.setState({topics: data,isLoading: falsE}));
}

render() {
    const {topics,isLoading} = this.state;

    if (isLoading) {
        return <p>Loading...</p>;
    }

    return (
        <div>
            <h2>Results List</h2>
            {topics.map((topic: any) =>
                <div className="panel panel-default">
                    <div className="panel-heading" key={topic.iD}>{topic.namE}</div>
                    <div className="panel-body" key={topic.iD}>{topic.description}</div>
                </div>
            )}
        </div>
    );
}
}

export default Results;