Vuex getter 返回未定义

Question

我有一个使用 vex 存储站点范围数据的 vue 应用程序，我获取用户信息并将其放入 before create 生命周期方法的状态，如下所示：

const app = new Vue({
    el: '#app',
    store,
    beforeCreate(){
        store.dispatch('currentUser');
    }
});

在我的用户模块中，我有一个获取用户名称的 getter，如下所示：

const getters = {
    getName(state){
        return state.user.name;
    }
};

在我的组件中，我试图访问 getter 以在组件中显示用户的姓名。当我查看 Vue Chrome 开发工具时，getter 不是未定义的，但是当我控制台记录 getter 结果时，它说未定义。

mounted(){
    console.log(store.getters.getName);
},

似乎组件在加载状态之前正在加载。我正在使用 axios 获取用户信息。我真的很困惑如何解决这个问题，因为我无法在我知道的任何时候尽快调用操作来获取用户数据。

如果在我的 getter 方法中我这样做：

state.user

我明白了：

{ "id": 1, "name": "Test" }

但是当我尝试获取名字时，我得到了未定义

这是商店：

import axios from "axios/index";

const state = {
    user: {},
};

const mutations = {
    FETCH_USER(state,user){
        state.user = user;
    },
    UPDATE_AVATAR(state,avatar){
        state.user.avatar = avatar;
    }
};

const getters = {
    getName(state){
      return state.user.name
    },
    avatar(state){
        return state.user.avatar;
    },
    userSocialNetworks(state){
        //return state.user.social_networks
    },
    schoolName(state){
        return state.user.school
    },
    schoolAbout(state){
        return state.user.school.about
    },
    schoolAddress(state){
        return state.user.school.address
    }
};

const actions = {
    currentUser: ({commit}) => {
        axios.get('/api/user').then(response => {
            commit('FETCH_USER', response.data);
        });

    }
}

export default {
    state,
    getters,
    actions,
    mutations

}


 {"user":{"user":{"name":"Test","email":"test@test.edu","avatar":"http://www.gravatar.com/avatar/xxxx=300","city":null,"state":null,"zip":null,"address":null,"lat":null,"long":null,"role":"school","school":{"id":1,"about":null,"header":null,"name":"Test","user_id":1,"created_at":"2018-06-06 19:48:16","updated_at":"2018-06-06 19:48:16"},"following":[],"followers":[],"social_networks":[{"id":4,"user_id":1,"social_network_id":1,"network_url":"test.com/k","created_at":"2018-06-06 23:11:09","updated_at":"2018-06-06 23:15:19"},{"id":5,"user_id":1,"social_network_id":2,"network_url":"test.com/k","created_at":"2018-06-06 23:15:19","updated_at":"2018-06-06 23:15:19"},{"id":6,"user_id":1,"social_network_id":5,"network_url":"test.com/k","created_at":"2018-06-06 23:16:15","updated_at":"2018-06-06 23:16:15"}]}},"socialNetowrks":{"available_networks":[{"id":1,"network_name":"Facebook","created_at":null,"updated_at":null},{"id":2,"network_name":"Instagram","created_at":null,"updated_at":null},{"id":5,"network_name":"Twitter","created_at":null,"updated_at":null}]}}

Answer 1

首先，钩子中的方法尚未初始化beforeCreate。解决这个问题最简单的方法是使用钩子created：

const app = new Vue({
    el: '#app',
    store,
    created(){
        store.dispatch('currentUser'); // considering you have properly imported and exported vuex
    }
});

在你的组件中

import {mapGetters} from 'vuex';

export default {
  computed: {
    ...mapGetters(['getName'])
  }
}