无法向react本机中的对象添加属性

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      myProperty: 'initial value'
    };
  }

  updateProperty = () => {
    this.setState({ myProperty: 'new value' });
  }

  render() {
    return (
      <div>
        <p>{this.state.myProperty}</p>
        <button onClick={this.updateProperty}>Update Property</button>
      </div>
    );
  }
}

export default MyComponent;

import React from 'react';

const MyComponent = (props) => {
  return (
    <div>
      <p>{props.myProperty}</p>
    </div>
  );
}

export default MyComponent;