indexedDB

indexedDB存储数据

 使用IndexedDB API将数据存储在浏览器本地

const request = indexedDB.open('myDatabase', 1)

request.onerror = function(event) {

  console.log('Database error: ' + event.target.errorCode)

}

request.onupgradeneeded = function(event) {

  const db = event.target.result

  const objectStore = db.createObjectStore('myObjectStore', { keyPath: 'id' })

  objectStore.createIndex('name', 'name', { unique: false })

}

request.onsuccess = function(event) {

  const db = event.target.result

  const transaction = db.transaction(['myObjectStore'], 'readwrite')

  const objectStore = transaction.objectStore('myObjectStore')

  const data = { id: 1, name: 'John Doe', age: 30 }

  const request = objectStore.add(data)

  request.onsuccess = function(event) {

    console.log('Data added to IndexedDB')

  }

  transaction.oncomplete = function(event) {

    db.close()

  }

}

indexedDB调用存储的数据

调用先前存储在indexedDB的名称为myDAtabase的数据

const request = indexedDB.open('myDatabase', 1)

request.onerror = function(event) {

  console.log('Database error: ' + event.target.errorCode)

}

request.onsuccess = function(event) {

  const db = event.target.result

  const transaction = db.transaction(['myObjectStore'], 'readonly')

  const objectStore = transaction.objectStore('myObjectStore')

  const request = objectStore.getAll()

  request.onsuccess = function(event) {

    console.log(event.target.result)

  }

}