SOURCE

class Cache {
    constructor(isLocal = true) {
        this.storage = isLocal ? localStorage : sessionStorage
    }

    setItem(key, value) {
        if (!this.verify(key, "key")) return
        if (this.verify(value, 'value')) {
            this.storage.setItem(key, JSON.stringify(value))
        }
    }
    getItem(key) {
        if (this.verify(key,"key")) {
            const value = this.storage.getItem(key)
            if (value) {
                return JSON.parse(value)
            }
        }
    }
    removeItem(key) {
        if (this.verify(key, "key")) {
            this.storage.removeItem(key)
        }
    }
    clear() {
        this.storage.clear()
    }
    key(index) {
        if (this.verify(index, "index")) {
            return this.storage.key(index)
        }

    }
    length() {
        return this.storage.length
    }
    verify(value, name) {
        switch (value) {
            case undefined:
                throw new Error(`${name} is a undefined`)
                break;
            case null:
                throw new Error(`${name} is a null`)
                break;
            default:
                return true
        }
    }
}

const localCache = new Cache()
const sessionCache = new Cache(false)
console.log("项目中引入使用。。。")
//项目使用打开下方注释代码
// export {
//     localCache,
//     sessionCache
// }