async function checkLastUpdated() {
async function fetchLastUpdatedDate() {
console.log('chash check!');
const response = await fetch('/lastmod.json'); // JSON ファイルの URL を指定
const data = await response.json();
return data.lastUpdated; // JSON ファイル内の最終更新日を返す
}
const lastUpdatedOnServer = await fetchLastUpdatedDate();
if(lastUpdatedOnServer == lastUpdateLog)  {
console.log('This data is upto Date');
} else {
console.log('old data is reload!');
}
}
checkLastUpdated();