基于localforage的浏览器存储INDEXEDDB的使用

一、指定storeName，一般用于存储业务数据

1）创建Storage

import { createLocalforage } from 'lonbon-common/lib/db.js'

window.accountStorage = createLocalforage({
    name: 'Business stroage',
    storeName: 'accountId:' + sessionStorage.accountId
})

2）使用Storage

window.accountStorage.setItem("tabActive", val) //存

let tabs = await window.accountStorage.getItem("tabs") //取

3）示例

二、不指定storeName，一般用于按日期存储的日志数据

1）创建Storage

import { createLocalforage } from 'lonbon-common/lib/db.js'

window.businessStorage = createLocalforage({
    name: 'Business stroage'
})

2）使用Storage，固定Key值，Key值+日期将作为storeName

window.businessStorage.setItem("PushAlarm", val) //存

3）示例

三、关于createLocalforage

import moment from 'moment/moment'
import localforage from 'localforage'
import UUID from 'uuidjs'

/**
 * 若构造函数传了storeName，则固定store
 * 若没传则setItem的key为storeName，即动态生成store
 */
export class webDB {

    constructor({ name, storeName, expire = 7 }) {
        this.name = name;
        this.storeName = storeName;
        this.expire = expire;
        this.index = 0;
        this.createStore()
    }

    createStore() {
        if(!this.storeName) return
        this.store = localforage.createInstance({
            name: this.name,
            storeName: this.storeName,
            driver: localforage.INDEXEDDB
        })
    }

    setItem(key, val) {
        if(this.store) {
            this.store.setItem(key, val)
            return
        }
        let store = localforage.createInstance({
            name: this.name,
            storeName: key + String(moment().format("YYYYMMDD")),
            driver: localforage.INDEXEDDB
        })
        store.setItem(`${moment().format("HH:mm:ss")}_${++this.index}`, val)
    }

    removeItem(key) {
        if(this.store) {
            this.store.removeItem(key)
        }
    }

    async getItem(key) {
        if(this.store) {
            return await this.store.getItem(key)
        }
        return null
    }

    async getAllItem() {
        let result = []
        if(this.store) {
            await this.store.iterate((value, key, iterationNumber) => {
                result.push({value, key})
            })
        }
        return result
    }

}

export function createLocalforage(options) {
    return new webDB(options)
}