IDBKeyRange: only() 静的メソッド

IDBKeyRange.only(value)

function displayData() {
  const keyRangeValue = IDBKeyRange.only("A");
  const transaction = db.transaction(["fThings"], "readonly");
  const objectStore = transaction.objectStore("fThings");
  objectStore.openCursor(keyRangeValue).onsuccess = (event) => {
    const cursor = event.target.result;
    if (cursor) {
      const listItem = document.createElement("li");
      listItem.textContent = `${cursor.value.fThing}, ${cursor.value.fRating}`;
      list.appendChild(listItem);
      cursor.continue();
    } else {
      console.log("全項目を表示しました。");
    }
  };
}