unmountComponentAtNode

已废弃

This API will be removed in a future major version of React.

In React 18, unmountComponentAtNode was replaced by root.unmount().

unmountComponentAtNode removes a mounted React component from the DOM.

unmountComponentAtNode(domNode)

Reference
- unmountComponentAtNode(domNode)
Usage
- Removing a React app from a DOM element

Reference

`unmountComponentAtNode(domNode)`

Call unmountComponentAtNode to remove a mounted React component from the DOM and clean up its event handlers and state.

import { unmountComponentAtNode } from 'react-dom';

const domNode = document.getElementById('root');
render(<App />, domNode);

unmountComponentAtNode(domNode);

See more examples below.

Parameters

domNode: A DOM element. React will remove a mounted React component from this element.

Returns

unmountComponentAtNode returns true if a component was unmounted and false otherwise.

Usage

Call unmountComponentAtNode to remove a mounted React component from a browser DOM node and clean up its event handlers and state.

import { render, unmountComponentAtNode } from 'react-dom';
import App from './App.js';

const rootNode = document.getElementById('root');
render(<App />, rootNode);

// ...
unmountComponentAtNode(rootNode);

Removing a React app from a DOM element

Occasionally, you may want to “sprinkle” React on an existing page, or a page that is not fully written in React. In those cases, you may need to “stop” the React app, by removing all of the UI, state, and listeners from the DOM node it was rendered to.

In this example, clicking “Render React App” will render a React app. Click “Unmount React App” to destroy it:

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import './styles.css';
import { render, unmountComponentAtNode } from 'react-dom';
import App from './App.js';

const domNode = document.getElementById('root');

document.getElementById('render').addEventListener('click', () => {
  render(<App />, domNode);
});

document.getElementById('unmount').addEventListener('click', () => {
  unmountComponentAtNode(domNode);
});