import React, { Component } from 'react';

class CurrentTime extends Component {
  constructor(props) {
    super(props);
    this.state = {
      currentTime: new Date().toLocaleTimeString()
    };
  }

  componentDidMount() {
    // 更新当前时间
    this.interval = setInterval(() => {
      this.setState({
        currentTime: new Date().toLocaleTimeString()
      });
    }, 1000);
  }

  componentWillUnmount() {
    // 清除定时器
    clearInterval(this.interval);
  }

  render() {
    return (
      <div>
        当前时间：{this.state.currentTime}
      </div>
    );
  }
}

export default CurrentTime;