语法

2023年05月15日

柏拉文

越努力，越幸运

一、setup store

---

2.1 main.ts

import { createApp } from 'vue'
import App from './App.vue'
import { createPinia } from "pinia"

const app = createApp(App);
const pinia = createPinia();

app.use(pinia);
app.mount('#app')

2.2 useGlobalState.ts

import { computed, ref } from "vue";
import { defineStore } from "pinia"


export const useGlobalState = defineStore('globalState',()=>{
    const a = ref(1);
    const countA = computed(()=>{
        return a.value * 2;
    });

    function setA(value:number){
        a.value += value;
    }

    return { a, countA, setA}
});

在 setup state 中:

• ref(): 就是 steate 的属性

• computed(): 就是 getter

• function: 就是 actions

2.3 App.vue 使用全局状态

<template>
  <div>
    {{ store.a }}
    {{ store.countA }}

    <Child></Child>
  </div>
</template>

<script setup lang="ts">
import Child from './Child.vue'
import { useGlobalState } from './stores/useGlobalState';
const store = useGlobalState();
</script>

2.4 Child.vue 改变全局状态

<template>
  <div>
    {{ store.a }}

    <button @click="store.setA(10)">按钮</button>
  </div>
</template>

<script setup lang="ts">
import { useGlobalState } from './stores/useGlobalState';
const store = useGlobalState();
</script>

二、option store

---

2.1 main.ts

import { createApp } from 'vue'
import App from './App.vue'
import { createPinia } from "pinia"

const app = createApp(App);
const pinia = createPinia();

app.use(pinia);
app.mount('#app')

2.2 useGlobalState.ts

import { defineStore } from "pinia"

export const useGlobalState = defineStore('globalState',{
    state:()=>{
        return {
            a: 1,
            b: 2,
            c: 3
        }
    },
    getters: {
        countA(state){
            return state.a * 2;
        },
        countB(state){
            return state.b + 2;
        }
    },
    actions: {
        setA(value: number){
            this.a += value;
        },
        setB(value: number){
            return new Promise((resolve)=>{
                setTimeout(()=>{
                    this.b -= value;
                    resolve(this.b);
                },2000)
            });
        }
    }
});

Option Store 可以传入一个带有 state、actions 与 getters 属性的 Option 对象。

• state: store 的数据(data)

• getters: store 的计算属性(computed)

• actions: actions 是方法(methods)

2.3 App.vue 使用全局状态

<template>
  <div>
    {{ store.a }}
    {{ store.countA }}

    <Child></Child>
  </div>
</template>

<script setup lang="ts">
import Child from './Child.vue'
import { useGlobalState } from './stores/useGlobalState';
const store = useGlobalState();
</script>

2.4 Child.vue 改变全局状态

<template>
  <div>
    {{ store.a }}

    <button @click="store.setA(10)">按钮</button>
  </div>
</template>

<script setup lang="ts">
import { useGlobalState } from './stores/useGlobalState';
const store = useGlobalState();
</script>