关于前端:浏览器storage封装

/*** * title: storage.js * Author: Gaby * Email: xxx@126.com * Time: 2022/6/1 17:30 * last: 2022/6/2 17:30 * Desc: 对存储的简略封装 */ import CryptoJS from 'crypto-js';// 十六位十六进制数作为密钥const SECRET_KEY = CryptoJS.enc.Utf8.parse("3333e6e143439161");// 十六位十六进制数作为密钥偏移量const SECRET_IV = CryptoJS.enc.Utf8.parse("e3bbe7e3ba84431a");// 类型 window.localStorage,window.sessionStorage,const config = {    type: 'localStorage', // 本地存储类型 sessionStorage    prefix: 'SDF_0.0.1', // 名称前缀 倡议：我的项目名 + 我的项目版本    expire: 1, //过期工夫 单位：秒    isEncrypt: true // 默认加密 为了调试不便, 开发过程中能够不加密}// 判断是否反对 Storageexport const isSupportStorage = () => {    return (typeof (Storage) !== "undefined") ? true : false}// 设置 setStorageexport const setStorage = (key, value, expire = 0) => {    if (value === '' || value === null || value === undefined) {        value = null;    }    if (isNaN(expire) || expire < 0) throw new Error("Expire must be a number");    expire = (expire ? expire : config.expire) * 1000;    let data = {        value: value, // 存储值        time: Date.now(), //存值工夫戳        expire: expire // 过期工夫    }        const encryptString = config.isEncrypt     ? encrypt(JSON.stringify(data))    : JSON.stringify(data);        window[config.type].setItem(autoAddPrefix(key), encryptString);}// 获取 getStorageexport const getStorage = (key) => {    key = autoAddPrefix(key);    // key 不存在判断    if (!window[config.type].getItem(key) || JSON.stringify(window[config.type].getItem(key)) === 'null') {        return null;    }    // 优化 继续应用中续期    const storage = config.isEncrypt     ? JSON.parse(decrypt(window[config.type].getItem(key)))     : JSON.parse(window[config.type].getItem(key));        let nowTime = Date.now();    // 过期删除    if (storage.expire && config.expire * 6000 < (nowTime - storage.time)) {        removeStorage(key);        return null;    } else {        // 未过期期间被调用 则主动续期 进行保活        setStorage(autoRemovePrefix(key), storage.value);        return storage.value;    }}// 是否存在 hasStorageexport const hasStorage = (key) => {    key = autoAddPrefix(key);    let arr = getStorageAll().filter((item)=>{        return item.key === key;    })    return arr.length ? true : false;}// 获取所有keyexport const getStorageKeys = () => {    let items = getStorageAll()    let keys = []    for (let index = 0; index < items.length; index++) {        keys.push(items[index].key)    }    return keys}// 依据索引获取keyexport const getStorageForIndex = (index) => {    return window[config.type].key(index)}// 获取localStorage长度export const getStorageLength = () => {    return window[config.type].length}// 获取全副 getAllStorageexport const getStorageAll = () => {    let len = window[config.type].length // 获取长度    let arr = new Array() // 定义数据集    for (let i = 0; i < len; i++) {        // 获取key 索引从0开始        let getKey = window[config.type].key(i)        // 获取key对应的值        let getVal = window[config.type].getItem(getKey)        // 放进数组        arr[i] = {'key': getKey, 'val': getVal,}    }    return arr}// 删除 removeStorageexport const removeStorage = (key) => {    window[config.type].removeItem(autoAddPrefix(key));}// 清空 clearStorageexport const clearStorage = () => {    window[config.type].clear();}// 名称前主动增加前缀const autoAddPrefix = (key) => {    const prefix = config.prefix ? config.prefix + '_' : '';    return  prefix + key;}// 移除已增加的前缀const autoRemovePrefix = (key) => {    const len = config.prefix ? config.prefix.length+1 : '';    return key.substr(len)    // const prefix = config.prefix ? config.prefix + '_' : '';    // return  prefix + key;}/** * 加密办法 * @param data * @returns {string} */const encrypt = (data) => {    if (typeof data === "object") {        try {            data = JSON.stringify(data);        } catch (error) {            console.log("encrypt error:", error);        }    }    const dataHex = CryptoJS.enc.Utf8.parse(data);    const encrypted = CryptoJS.AES.encrypt(dataHex, SECRET_KEY, {        iv: SECRET_IV,        mode: CryptoJS.mode.CBC,        padding: CryptoJS.pad.Pkcs7    });    return encrypted.ciphertext.toString();}/** * 解密办法 * @param data * @returns {string} */const decrypt = (data) => {    const encryptedHexStr = CryptoJS.enc.Hex.parse(data);    const str = CryptoJS.enc.Base64.stringify(encryptedHexStr);    const decrypt = CryptoJS.AES.decrypt(str, SECRET_KEY, {        iv: SECRET_IV,        mode: CryptoJS.mode.CBC,        padding: CryptoJS.pad.Pkcs7    });    const decryptedStr = decrypt.toString(CryptoJS.enc.Utf8);    return decryptedStr.toString();}