vue3+ts vuex的使用


vuex官方文档

1.安装

参考官网

2.store

初始化store

import { createStore } from 'vuex'
const store = createStore({})
export default store

main.ts引入store

import store from './store'
createApp(App).use(store)

3.state

初始化state

import { createStore} from 'vuex'
interface IUserInfo{
  id: string,
  account: string,
  avatar: string,
  nickname: string,
  status: number
}
interface IState{
  user:IUserInfo
}

const state:IState = {
  user:{} as IUserInfo
}
const store = createStore({
  state:state
})
export default store

使用state

import { useStore } from 'vuex'
const store = useStore()
store.state.userInfo

4.getters

getters就是在state上进行的封装

定义getters

//定义
const getters = {
  getUserInfo(state?:IState){
    return state?.user
  }
}
//注册
const store = createStore({
  state:state,
  getters:getters
})

getters派生方法

getters可以对state里面的数据起到过滤的作用,比如返回角色是超级管理员的用户。

const getters = {
 isAdmin:(state?:Istate)=>(id:number)=>{
 	return id === state?.admin.id
 }
}

使用getters派生方法

const isAdmin =  store.getters.isAdmin(2)

5.mutation

更改Vuex的store中的状态的唯一方法是提交mutation。接受state作为第一个参数。

初始化mutation

//定义mutation,注意此时如果不把state:IState作为第一个参数传入,会报类型不匹配的错误

const mutations = {
  setUserInfo(state:IState,user:IUserInfo){
    state.user = user
  }
}
//注册到store里面
const store = createStore({
  state:state,
  getters:getters,
  mutations:mutations
})

commit使用mutation中函数

import { useStore } from 'vuex'
const store = useStore()
const setUserInfo = () => {
  store.commit('setUserInfo', {
    id: 'idtest',
    account: 'zhao',
    avatar: 'avat',
    nickname: 'xin',
    status: 1
  })
 //打印验证是否修改state数据
  console.log('store.state.user', store.state.user)
}

响应式渲染state中的数据

此时user信息虽然更改,但页面上不会做响应式变化,想要使用响应式变化,需要使用computed

const user = computed(() => store.state.user)

不这样定义也可以,在html代码中使用store进行渲染

<template>
{{store.state.user}}
</template>
posted @ 2022-05-25 11:12  黑蛋的博客  阅读(1841)  评论(0编辑  收藏  举报