在React组件构造函数中处理promise链

import React, { Component } from 'react';
import axios from 'axios';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      data: null,
      loading: true,
      error: null
    };
  }

  componentDidMount() {
    const promise = axios.get('https://api.example.com/data');

    promise
      .then(response => {
        this.setState({
          data: response.data,
          loading: false,
          error: null
        });
      })
      .catch(error => {
        this.setState({
          data: null,
          loading: false,
          error: error.message
        });
      });
  }

  render() {
    const { data, loading, error } = this.state;

    if (loading) {
      return <div>Loading...</div>;
    }

    if (error) {
      return <div>Error: {error}</div>;
    }

    return <div>Data: {data}</div>;
  }
}

export default MyComponent;