计算属性未在不同的选项卡中更新 UI

Question

我使用 vuex 进行状态管理并使用 firebase
我用vuex-persisted state在cookies中保存状态

在我的 vuex 商店中，我管理我的 用户数据（用户名，登录状态）如下

我的store.js

/all imports here
export const store = new Vuex.Store({
   state : {
    user: {
        loggedIn: false,
        userName: 'Guest'
    }
},

getters : {
    g_user: state => {
        return state.user;
    }
},

mutations : {
    m_logInUser: (state, userName) => {
        state.user.loggedIn = true;
        state.user.userName = userName;

    },
    m_loggedOut: (state) => {
        state.user.loggedIn = false;
        state.user.userName = 'Guest';
    }
},

actions : {
    a_logInUser: ({state, commit}, userInput) => {
        //call to the API and on success commit m_logInUser mutation
    },
    a_loggedOut: ({commit}) => {
        //call to the API and on success commit m_loggedOut mutation
    }
},
plugins: [
     createPersistedState({
         paths: ['authStore.user'],
         getState: (key) => Cookie.getJSON(key), 
         setState: (key, state) => Cookie.set(key, state, { expires: 3, secure: false })
     })
]
});

现在我面临的问题

当我在两个不同的选项卡中打开应用程序并在第一个选项卡中登录用户时，用户登录现在隐藏登录按钮并显示注销按钮并显示用户名
但在第二个选项卡中它仍然显示登录按钮，但是当我为用户 console.log 时，它显示已登录以及用户名

这是我的 header.vue 组件

<template>
  <nav class="navbar navbar-default">
<div class="container-fluid">
  <div class="navbar-header">
    <router-link to="/" tag="a" class="navbar-brand">Brand</router-link>
 </div>
  <!-- Collect the nav links, forms, and other content for toggling -->
  <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
    <ul class="nav navbar-nav">
        <li @click="testmethod"><a>cuser</a></li>
        <router-link to="/statuses" active-class="active" tag="li"><a>Status</a></router-link>
        <router-link to="/users" active-class="active" tag="li"><a>Users</a></router-link>
    </ul>
    <ul class="nav navbar-nav navbar-right" v-if="!g_user.loggedIn">
      <router-link to="/signup" active-class="active" tag="li"><a>Signup</a></router-link>
      <router-link :to="{name: 'login'}" active-class="active" tag="li"><a>Login</a></router-link>
    </ul>
    <ul class="nav navbar-nav navbar-right" v-else>
        <router-link to="/post" tag="li"><a><button class="btn btn-info">POST</button></a></router-link>
        <router-link to="/current" active-class="active" tag="li"><a>{{ g_user.userName }}</a></router-link>
        <li @click="logOut"><a>Log out</a></li>
    </ul>
  </div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
</template>

<script>
import { mapGetters } from 'vuex'
export default{
    methods: {
        logOut(){
            this.$store.dispatch('a_loggedOut');
        },
        testmethod(){
            var user = this.$firebase.auth().currentUser;

        console.log(user);
        console.log(user.email);
        }

    },
    computed: {
        ...mapGetters([
            'g_user'
        ])
    }
}
</script>

Answer 1

您可以 watch 您的 Vuex 状态：

mounted() {
  this.$store.watch(
    function(state) {
      return state.g_user.loggedIn;
    },
    function(value) {
      if (value === true) {
        console.log('user is logged in');
        // do your logic here, setup loggedin behavior hooks. For example call login() function which should first check if the user is already logged in
      }
    },
    {
      immediate: true
    }
  );
},

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