我試圖獲得 covid 案例最多的前 5 個(gè)國(guó)家/地區(qū)，但是當(dāng)我嘗試為此調(diào)整另一個(gè)代碼時(shí)，出現(xiàn)錯(cuò)誤。 fetch("https://pomber.github.io/covid19/timeseries.json") .then(response => response.json()) .then(data => {var countryArr = Object.keys(data).map(i => i);                countryArr.forEach((country) => {                let countryData = data[country];                countryData = countryData[countryData.length - 1];                })                                let countries = getCovidRank(countryArr, message)                countries.map((countryData, index) => {                    countries[index] = `\\?? #${index+1} | **Country**: \`\`${countryData[0]}\`\` | **Confirmed**: \`\`${countryData[0].confirmed}\`\``                    })//The rest of the code will always work, the problem is up there}這是 getCovidRank 文件：getCovidRank: (countryArr, message) => {        let countryList = []        for(var country in countryArr) {           let countryData = countryArr.confirmed            countryList.push([countryArr, (countryData[country])])        }                countryList.sort((countryData1, countryData2) => {            return countryData2[1] - countryData1[1] || countryData2[2] - countryData1[2]        })        return countryList;            }我真的希望你能幫助我，我正在努力學(xué)習(xí)如何做到這一點(diǎn)。下面的代碼顯示了全局情況（這段代碼很好）：            var worldStats = { confirmed: 0, recovered: 0, deaths: 0 };            var countryArr = Object.keys(data).map(i => i);            countryArr.forEach((country) => {            let countryData = data[country];            // pick last object for today data                countryData = countryData[countryData.length - 1];                worldStats.confirmed += countryData.confirmed;                worldStats.recovered += countryData.recovered;                worldStats.deaths += countryData.deaths;            });