学习Pinia 第七章（pinia插件）

const __piniaKey = '__PINIAKEY__'
//定义兜底变量
type Options = {
   key?:string
}
//定义入参类型
//将数据存在本地
const setStorage = (key: string, value: any): void => {
localStorage.setItem(key, JSON.stringify(value))
}
//存缓存中读取
const getStorage = (key: string) => {
return (localStorage.getItem(key) ? JSON.parse(localStorage.getItem(key) as string) : {})
}
//利用函数柯丽华接受用户入参
const piniaPlugin = (options: Options) => {
//将函数返回给pinia  让pinia  调用 注入 context
return (context: PiniaPluginContext) => {
const { store } = context;
const data = getStorage(`${options?.key ?? __piniaKey}-${store.$id}`)
store.$subscribe(() => {
setStorage(`${options?.key ?? __piniaKey}-${store.$id}`, toRaw(store.$state));
})
//返回值覆盖pinia 原始值
return {
...data
}
}
}
//初始化pinia
const pinia = createPinia()
//注册pinia 插件
pinia.use(piniaPlugin({
key: "pinia"
}))