在React组件的render()内调用函数以更改css

import React, { Component } from 'react';

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

  toggleHighlight = () => {
    this.setState(prevState => ({
      isHighlighted: !prevState.isHighlighted
    }));
  }

  changeStyle = () => {
    if (this.state.isHighlighted) {
      return {
        backgroundColor: 'yellow',
        color: 'black'
      };
    } else {
      return {
        backgroundColor: 'white',
        color: 'blue'
      };
    }
  }

  render() {
    return (
      <div>
        <button onClick={this.toggleHighlight}>Toggle Highlight</button>
        <div style={this.changeStyle()}>This is a React component.</div>
      </div>
    );
  }
}

export default MyComponent;