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@just4/storage

v2.0.0

Published

Just for making localStorage and sessionStorage easier to use.

Downloads

7

Readme

@just4/storage

对 Web 存储对象(localStorage、sessionStorage)进行封装,使其接口更易用。封装后提供以下接口:

| 接口 | 说明 | | --- | --- | | get(key) | 即存储对象的 getItem 方法 | | getAsJSON(key) | 对 get 的结果执行 JSON.parse 后返回 | | set(key, value) | 调用存储对象的 setItem 方法时做了 try...catch 处理 | | setAsJSON(key, value, options) | 对 value 执行 JSON.stringify 后再调用 set | | remove(key) | 即存储对象的 removeItem 方法 |

安装

npm i @just4/storage

调用示例

import { local, session } from '@just4/storage';
// local 即 localStorage 的封装
// session 即 sessionStorage 的封装
// 这两个对象没有任何插件(插件的说明见下文)

const user = { name: 'Tom', pet: 'cat' };

session.setAsJSON('user', user);
typeof session.get('user'); // 'string'
typeof session.getAsJSON('user'); // 'object'

local.setAsJSON('user', user);
local.getAsJSON('user');
typeof local.get('user'); // 'string'
typeof local.getAsJSON('user'); // 'object'

注意

当存储空间已满,或浏览器开启了隐私模式(无痕模式)时,set 操作可能无法往存储空间写入内容,但该方法不会抛出异常。开发者需要在业务代码中要做好数据无法被存储的预案。

插件机制

本程序包在 1.1.0 这个版本中引入了插件机制。该机制的实质就是在设置存储项的值时,以更多的关联存储项去配置存储属性。

举个例子:在设置 token 存储项的值为 abcde 时,以另外一个名叫 __expires_of_token 的关联存储项来存储过期时间。在获取 token 的值时,如果当前时间已经超过 __expires_of_token 所存储的过期时间,则返回 null,否则返回 abcde

所有的插件都继承于 StorageWrap,并按需覆盖 _doGetting_doSetting 以及 _doRemoving 三个方法。

注意,本程序包提供的 localsession 两个 StorageWrap 对象都不带有任何插件。

过期时间插件

本程序包提供了过期时间插件,调用示例如下:

const storage = new StorageWrap('local', {
  plugins: [
    new ExpiresPlugin('local')
  ]
});
storage.set('test-01', '1', { expires: '1 month' });

相关文档

Changelog

v2.0.0

  • StorageWrap 的构造函数参数变更为 storageTypeoptions,不兼容 v1.x 的调用方式。
  • StorageWrap 新增 available 属性表示当前存储是否可用。
  • StorageWrapset 方法不再返回操作是否成功。
  • StorageWrap 进行了重构使其能支持插件机制。
  • 新增过期时间插件 ExpiresPlugin,可以指定存储项的过期时间。