js是否可以获取本地数据库

let request = indexedDB.open('myDatabase', 1);

request.onupgradeneeded = function(event) {
  let db = event.target.result;
  let objectStore = db.createObjectStore('customers', { keyPath: 'id' });
  objectStore.createIndex('name', 'name', { unique: false });
};

request.onsuccess = function(event) {
  let db = event.target.result;
  let transaction = db.transaction(['customers'], 'readwrite');
  let objectStore = transaction.objectStore('customers');

  let customer = { id: 1, name: 'John Doe' };
  let request = objectStore.add(customer);

  request.onsuccess = function(event) {
    console.log('Customer added to database.');
  };

  transaction.oncomplete = function(event) {
    db.close();
  };
};

request.onerror = function(event) {
  console.log('Database error: ' + event.target.errorCode);
};

// 存储数据
localStorage.setItem('username', 'JohnDoe');

// 读取数据
let username = localStorage.getItem('username');
console.log(username); // 输出: JohnDoe

// 删除数据
localStorage.removeItem('username');