属性未定义，无法对其进行结构分析

let obj = {}; // 初始化对象
obj.property = "value"; // 设置属性

function myFunction() {
    let localVar = "I am local";
    console.log(localVar); // 可以访问
}

myFunction();
console.log(localVar); // 报错，localVar未定义

let obj = "I am a string";
console.log(obj.property); // 报错，obj不是对象

if (typeof obj === 'object' && obj !== null) {
    console.log(obj.property); // 安全访问
}

async function fetchData() {
    let data = await fetch('https://api.example.com/data');
    let jsonData = await data.json();
    console.log(jsonData.property); // 确保数据加载完成后再访问
}

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

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

    useEffect(() => {
        async function fetchData() {
            let response = await fetch('https://api.example.com/data');
            let jsonData = await response.json();
            setData(jsonData);
        }
        fetchData();
    }, []);

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

    return (
        <div>
            <h1>{data.title}</h1>
            <p>{data.description}</p>
        </div>
    );
}

export default MyComponent;