IDBObjectStore: get() 方法

get(key)

// Let us open our database
const DBOpenRequest = window.indexedDB.open("toDoList", 4);

DBOpenRequest.onsuccess = (event) => {
  note.appendChild(document.createElement("li")).textContent =
    "Database initialized.";

  // store the result of opening the database in the db variable.
  // This is used a lot below
  db = DBOpenRequest.result;

  // Run the getData() function to get the data from the database
  getData();
};

function getData() {
  // open a read/write db transaction, ready for retrieving the data
  const transaction = db.transaction(["toDoList"], "readwrite");

  // report on the success of the transaction completing, when everything is done
  transaction.oncomplete = (event) => {
    note.appendChild(document.createElement("li")).textContent =
      "Transaction completed.";
  };

  transaction.onerror = (event) => {
    note.appendChild(document.createElement("li")).textContent =
      `Transaction not opened due to error: ${transaction.error}`;
  };

  // create an object store on the transaction
  const objectStore = transaction.objectStore("toDoList");

  // Make a request to get a record by key from the object store
  const objectStoreRequest = objectStore.get("Walk dog");

  objectStoreRequest.onsuccess = (event) => {
    // report the success of our request
    note.appendChild(document.createElement("li")).textContent =
      "Request successful.";

    const myRecord = objectStoreRequest.result;
  };
}