如何获取react中元素的当前状态以呈现进度条？

import React, { Component } from 'react';

class ProgressBar extends Component {
  constructor(props) {
    super(props);
    this.state = {
      progress: 0,
    };
  }

  componentDidMount() {
    this.timer = setInterval(() => {
      if (this.state.progress < 100) {
        this.setState((prevState) => ({
          progress: prevState.progress + 10,
        }));
      } else {
        clearInterval(this.timer);
      }
    }, 1000);
  }

  componentWillUnmount() {
    clearInterval(this.timer);
  }

  render() {
    const { progress } = this.state;

    return (
      <div>
        <div
          style={{
            width: `${progress}%`,
            height: '20px',
            backgroundColor: 'green',
          }}
        />
        <span>{`${progress}%`}</span>
      </div>
    );
  }
}

export default ProgressBar;