53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
function parse(str) {
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if (str === null) return undefined
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const type = str[0]
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const strVal = str.slice(1)
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// 对象时，有可能是Date, 否则反解析后统一是对象
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if (type === 'o' || type === 'b') {
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let val = JSON.parse(strVal)
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return typeof val === 'string' ? new Date(val) : val
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}
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if (type === 'n') return +Number(strVal)
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if (type === 's') return strVal
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}
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// 带前缀的保存值
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function save(store, k, v) {
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const type = typeof v
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store.setItem(k, type[0] + (type === 'object' ? JSON.stringify(v) : v))
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}
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/**
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* 快速的保存值到 sessionStorage, localStorage.
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* 支持基本类型，时间，数组，对象,null，不存在的键值返回undefined 。
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* 不支持：Map,Set, 以及多级串联赋值，比如：$session.obj.name="abcd"
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*/
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function handler(storage) {
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return {
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get(target, propKey) {
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let val = storage.getItem(propKey)
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return parse(val)
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},
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set(target, propKey, value) {
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save(storage, propKey, value)
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return true
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}
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}
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}
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const typeMatcher = { session: null, local: null }
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/**
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* 用于记录值到localStorage或 sessionStorage, 并保持数据的类型！
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* @ const $s = useStorage("session");
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* @ $s.abc="abc"
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* @param {*} type 存储到的目标 "session" || "local"
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* @returns Proxy对象
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*/
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export const useStorage = (type) =>
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typeMatcher[type] || //
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(typeMatcher[type] = new Proxy({}, handler(type === 'session' ? sessionStorage : localStorage)))
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export const $session = useStorage('session')
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export const $local = useStorage('local')
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