解析錯誤：基本 react.js 文件中 EOF 處的意外令牌“”

Question

編譯一個簡單的反應應用程序時，我在文件的最后（空白）行收到一條錯誤消息“Unexpected Token”

import { Link, Redirect } from "react-router-dom";
import './App.css';


class Companies extends Component {
    constructor(props) {
        super(props);
        var user = null;
        if (props.hasOwnProperty("user")){
            user = props["user"];
        }
        this.state = {
            user: user,
            companies: [],
        };
    }

}

export Companies

是我試圖運行的代碼

Failed to compile.

./src/Companies.js
  Line 22:1:  Parsing error: Unexpected token

  20 |
  21 | export Companies
> 22 |
     | ^

是我收到的錯誤消息。

Answer 1

要導出 class，正確的語法是： export default Class

嘗試這個：

import { Link, Redirect } from "react-router-dom";
import './App.css';


class Companies extends Component {
    constructor(props) {
        super(props);
        var user = null;
        if (props.hasOwnProperty("user")){
            user = props["user"];
        }
        this.state = {
            user: user,
            companies: [],
        };
    }

}

export default Companies