HTML5录音实践总结(Preact)(4)

const indexedDB = window.indexedDB || window.webkitIndexedDB || window.mozIndexedDB || window.OIndexedDB || window.msIndexedDB const IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction || window.OIDBTransaction || window.msIDBTransaction const readWriteMode = typeof IDBTransaction.READ_WRITE === 'undefined' ? 'readwrite' : IDBTransaction.READ_WRITE const dbVersion = 1 const storeDefault = 'mp3' let dbLink function initDB(store) { return new Promise((resolve, reject) => { if (dbLink) resolve(dbLink) // Create/open database const request = indexedDB.open('audio', dbVersion) request.onsuccess = event => { const db = request.result db.onerror = event => { reject(event) } if (db.version === dbVersion) resolve(db) } request.onerror = event => { reject(event) } // For future use. Currently only in latest Firefox versions request.onupgradeneeded = event => { dbLink = event.target.result const { transaction } = event.target if (!dbLink.objectStoreNames.contains(store)) { dbLink.createObjectStore(store) } transaction.oncomplete = event => { // Now store is available to be populated resolve(dbLink) } } }) } export const writeIDB = async (name, blob, store = storeDefault) => { const db = await initDB(store) const transaction = db.transaction([store], readWriteMode) const objStore = transaction.objectStore(store) return new Promise((resolve, reject) => { const request = objStore.put(blob, name) request.onsuccess = event => resolve(event) request.onerror = event => reject(event) transaction.commit && transaction.commit() }) } export const readIDB = async (name, store = storeDefault) => { const db = await initDB(store) const transaction = db.transaction([store], readWriteMode) const objStore = transaction.objectStore(store) return new Promise((resolve, reject) => { const request = objStore.get(name) request.onsuccess = event => resolve(event.target.result) request.onerror = event => reject(event) transaction.commit && transaction.commit() }) } export const clearIDB = async (store = storeDefault) => { const db = await initDB(store) const transaction = db.transaction([store], readWriteMode) const objStore = transaction.objectStore(store) return new Promise((resolve, reject) => { const request = objStore.clear() request.onsuccess = event => resolve(event) request.onerror = event => reject(event) transaction.commit && transaction.commit() }) }

WebView 开启 WebRTC

见 WebView WebRTC not working

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