Vuex4 - 无法读取未定义的属性（读取“状态”）

Question

我正在使用Vue3and Vuex4，我不断收到错误：

Uncaught TypeError: Cannot read properties of undefined (reading 'state')
    at ReactiveEffect.eval [as fn] (App.vue?3dfd:36)
    at ReactiveEffect.run (reactivity.esm-bundler.js?a1e9:160)
    at ComputedRefImpl.get value [as value] (reactivity.esm-bundler.js?a1e9:1087)
    at setup (App.vue?3dfd:37)
    at callWithErrorHandling (runtime-core.esm-bundler.js?5c40:6656)
    at setupStatefulComponent (runtime-core.esm-bundler.js?5c40:6272)
    at setupComponent (runtime-core.esm-bundler.js?5c40:6228)
    at mountComponent (runtime-core.esm-bundler.js?5c40:4081)
    at processComponent (runtime-core.esm-bundler.js?5c40:4056)
    at patch (runtime-core.esm-bundler.js?5c40:3651)

我正在尝试将“hello”设置为消息变量，以便我可以在整个应用程序中使用它，这是我的main.js文件：

import { createApp} from 'vue'
import App from './App.vue'
import router from './router'
import { createStore } from 'vuex';


const store = createStore({
  state(){
    return{
      message: 'hello'
    }
  }
})


createApp(App).use(router, store).mount('#app')

这是我的 App.vue 文件，我尝试使用计算函数通过组合 api 接收它。

import { ref, computed } from 'vue'
import { useStore } from 'vuex'

export default {
  name: 'App',
  setup(){
    const store = useStore();

    const message = computed(() => store.state.message);
    console.log(message.value);

    return{ }
  }
}

Answer 1

尝试使用：

createApp(App)
  .use(router)
  .use(store)
  .mount('#app')