React有条件地渲染窗口大小保持更新值

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      windowWidth: window.innerWidth,
      windowHeight: window.innerHeight
    };
  }

  componentDidMount() {
    window.addEventListener('resize', this.handleResize);
  }

  componentWillUnmount() {
    window.removeEventListener('resize', this.handleResize);
  }

  handleResize = () => {
    this.setState({
      windowWidth: window.innerWidth,
      windowHeight: window.innerHeight
    });
  }

  render() {
    const { windowWidth, windowHeight } = this.state;

    return (
      <div>
        <p>窗口宽度：{windowWidth}px</p>
        <p>窗口高度：{windowHeight}px</p>
      </div>
    );
  }
}

export default MyComponent;