大家好，我有一个项目，它从 API 获得响应，然后将数据从父级传递到子级。问题是，我可以轻松访问顶层的响应，但当我尝试进入 API 的内部部分（在本例中为 price={statistics.quotes.USD.price ）时，我收到了 TypeError: Cannot read property 'USD' of undefined 错误。我尝试使用 console.logging 价格来检查我的路径是否正确，结果是正确的。为什么当我可以正确访问其他数据时会发生这种情况？

Overview.js

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

export default function Overview(props) {
    const id = props.match.params.currency;

    //some other states here

    const [statistics, setStatistics] = useState({});

    //some code

    const fetchBasicData = async () => {
        // Retrieves a coin's basic information
        const apiCall = await axios.get('https://api.coinpaprika.com/v1/coins/' + id);
        let basicData = await apiCall.data;

        setCoin(basicData);
            
        // Retrieves coin statistics
        const fetchedData = await axios.get('https://api.coinpaprika.com/v1/tickers/' + id);
        const coinStats = await fetchedData.data;

        setStatistics(coinStats);
    }

    useEffect(function () {
        if (Object.keys(coin).length === 0 && Object.keys(statistics).length === 0) {
            fetchBasicData();
        }
    })

    //some code

    return (
        <div>
            //some other stuff
            <Statistics
                statistics={statistics}
                lastUpdate={statistics.last_updated}
                price={statistics.quotes.USD.price}          // <----- this is where the error occurs
             />
        </div>
    );
}

Statistics.js

import React from 'react';

export default function Statistics(props) {
    return (
        <div>
            <h1>Statistics</h1>
            <p>Last updated: {props.lastUpdate}</p>
            <p>Price: {props.price}</p>
            <p>Market Rank: {props.marketRank}</p>
            <h2>Supply</h2>
            <p>Circulating supply: {props.circulatingSupply}</p>
            <p>Max supply: {props.maxSupply}</p>
        </div>
    );
}