在React JS中处理来自异步请求的数据

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      data: null
    };
  }

  componentDidMount() {
    fetch('https://api.example.com/data')
      .then(response => response.json())
      .then(data => this.setState({ data }));
  }

  render() {
    const { data } = this.state;
    if (data === null) {
      return <div>Loading...</div>;
    }
    return <div>{data}</div>;
  }
}

import React, { useState, useEffect } from 'react';
import axios from 'axios';

const MyComponent = () => {
  const [data, setData] = useState(null);

  useEffect(() => {
    axios.get('https://api.example.com/data')
      .then(response => setData(response.data));
  }, []);

  if (data === null) {
    return <div>Loading...</div>;
  }
  return <div>{data}</div>;
};

import React, { useState, useEffect } from 'react';

const MyComponent = () => {
  const [data, setData] = useState(null);

  useEffect(() => {
    const fetchData = async () => {
      try {
        const response = await fetch('https://api.example.com/data');
        const data = await response.json();
        setData(data);
      } catch (error) {
        console.error(error);
      }
    };

    fetchData();
  }, []);

  if (data === null) {
    return <div>Loading...</div>;
  }
  return <div>{data}</div>;
};