javascript - ./src/index.js第10行: 'elementid' is not defined no-undef

Question

import React from 'react';
import ReactDOM from 'react-dom';
import {BrowserRouter} from "react-router-dom";
import *  as serviceWorker from './serviceWorker';
import App from '/App';

ReactDOM.render(
<BrowserRouter>
<App/>
</BrowserRouter>, document.getElementById(elementid, 'root'));
serviceWorker.unregister();

我只是在reactjs的index.js文件中键入此代码，然后会发生此错误

Failed to compile
./src/index.js
  Line 10:  'elementid' is not defined  no-undef

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所以请告诉我，该如何解决此错误

Answer 1

React Dom Render需要元素引用，因此您必须使用document.getElementById('root')提供引用。只需删除elementid