IndexedDB 库 渐进式 Web App 阅读笔记

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IndexedDB 库 渐进式 Web App

PWA 相关资料

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let dbVersion = 1;
let dbName = 'test';
let idb = window.indexedDB.open(dbName, dbVersion);
idb.onerror = (evt) => {
    console.log('failed created indexDB');
}
idb.onupgradeneeded = function(evt) {
    let db = evt.target.result;
    let keypath = 'test-unique';
    let store = db.createObjectStore('customers', {
        keypath
    })
    store.createIndex("name", "name", {
        unique: false
    });
    store.createIndex("email", "email", {
        unique: true
    });
    let transaction = db.transaction(["customers"], "readwrite");
}
//删除idb
let delRequest = window.indexedDB.deleteDatabase(dbName);
delRequest.onerror = function(evt) {
    console.log('Error delelting database')
}
delRequest.onsuccess = function(evt) {
    console.log(`Delelted database successfully ${delRequest.result}`);
    console.log(delRequest.result);
}
console.log(delRequest.readyState) //pending

支持插件

idb-keyval :提供 Promise， key-value 支持
dexie: 提供Promises，复杂查询、辅助索引

参考资料

MDN IDBIndex
使用 IndexedDB