NativeScript Vue - VueX 不工作：无法读取未定义的属性获取器

Question

我有一个名为 auth 的 VueX 模块。

这是模块：

export const auth = {
  namespaced: true,
  state: {
   user: null,
   status: {
    loggedIn: true
   }
  },
  actions: {

  },
  mutations: {

  },
  getters: {
    currentUser(state) {
      return state.user;
    },
    loggedIn(state) {
      return state.status.loggedIn;
    }
  } 
}

为了简洁起见，我省略了动作和突变。如您所见，我有明确定义的吸气剂。我在我的 store.ts 文件中注册模块，如下所示：

import Vue from 'vue';
import Vuex from 'vuex';
import { auth } from './store/auth.module.js';

Vue.use(Vuex);

export default new Vuex.Store({
  state: {

  },
  mutations: {

  },
  actions: {

  },
  modules: {
    auth
  }
});

现在我希望访问组件中的吸气剂，所以我尝试了 mapGetters(['auth/loggedIn']) 和 mapGetters('auth', ['loggedIn']) 计算但我都得到了错误。这是它的样子：

computed: {
    ...mapGetters(['auth/loggedIn'])
}

我什至尝试通过this.$store.getters['auth/loggedIn'] 直接访问getter，但这不起作用。

知道可能是什么问题吗？

编辑：这是我运行tns preview 命令后的错误：

Webpack compilation complete. Watching for file changes.
Webpack build done!
Project successfully prepared (android)
Start sending initial files for device Nexus 6P (2e6517cd-cc2c-45a8-8915-525d6e437822).
Successfully sent initial files for device Nexus 6P (2e6517cd-cc2c-45a8-8915-525d6e437822).
LOG from device Nexus 6P: [Vue warn]: Error in created hook: "TypeError: Cannot read property 'getters' of undefined"
LOG from device Nexus 6P: '{NSVue (Vue: 2.6.10 | NSVue: 2.5.0)} -> CreateElement(NativeFrame)'
LOG from device Nexus 6P: 
LOG from device Nexus 6P: An uncaught Exception occurred on "main" thread.
Unable to start activity ComponentInfo{org.nativescript.preview/com.tns.NativeScriptActivity}: com.tns.NativeScriptException: Calling js method onCreate failed
TypeError: Cannot read property 'getters' of undefined

StackTrace:
java.lang.RuntimeException: Unable to start activity ComponentInfo{org.nativescript.preview/com.tns.NativeScriptActivity}: com.tns.NativeScriptException: Calling js method onCreate failed
TypeError: Cannot read property 'getters' of undefined
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
    at android.app.ActivityThread.-wrap11(Unknown Source:0)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
    at android.os.Handler.dispatchMessage(Handler.java:105)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6541)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: com.tns.NativeScriptException: Calling js method onCreate failed
TypeError: Cannot read property 'getters' of undefined
    at com.tns.Runtime.callJSMethodNative(Native Method)
    at com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:1286)
    at com.tns.Runtime.callJSMethodImpl(Runtime.java:1173)
    at com.tns.Runtime.callJSMethod(Runtime.java:1160)
    at com.tns.Runtime.callJSMethod(Runtime.java:1138)
    at com.tns.Runtime.callJSMethod(Runtime.java:1134)
    at com.tns.NativeScriptActivity.onCreate(NativeScriptActivity.java:20)
    at android.app.Activity.performCreate(Activity.java:6975)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
    ... 9 more

Answer 1

问题是文件store.ts中的导入语句import Vue from "vue"

我将其更改为 import Vue from "nativescript-vue"，现在似乎一切正常。

我在这里创建了一个问题https://github.com/NativeScript/NativeScript/issues/8570，因为按照官方网站建议的入门步骤添加了错误的导入：https://nativescript-vue.org/en/docs/getting-started/quick-start/

Answer 2

您必须正确定义您的状态才能使getters 工作。

所以你必须有这样的状态：

  state:{
    user: null,
    status: {
      loggedIn: true
    }
  },

然后在你的组件中：

  computed: {
    ...mapGetters({loggedIn: "auth/loggedIn"})
  },

现在您可以通过 this.loggedIn 访问您的状态

更新

您也必须将 store 添加到您的 vue 实例中：

const app = new Vue({
  el:'#app',
  store, // here
})