在react中的链接上添加活动类

state = {
  isActive: false
}

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

  return (
    <a href="#" className={isActive ? 'active' : ''}>Link</a>
  );
}

handleClick = () => {
  this.setState({ isActive: true });
}

render() {
  // ...
  return (
    <a href="#" className={isActive ? 'active' : ''} onClick={this.handleClick}>Link</a>
  );
}