组件在状态更改后不会重新呈现

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  handleClick = () => {
    this.setState(prevState => ({
      count: prevState.count + 1
    }));
  }

  shouldComponentUpdate(nextProps, nextState) {
    // 判断状态是否发生变化，如果没有变化则不重新渲染组件
    if (this.state.count === nextState.count) {
      return false;
    }
    return true;
  }

  render() {
    return (
      <div>
        <p>Count: {this.state.count}</p>
        <button onClick={this.handleClick}>Increment</button>
      </div>
    );
  }
}

export default MyComponent;