Vue.js Vuetables2(vuex)react性不起作用

我有几个组件使用vue-tables-2，但其中一个组件在我更改路由之前不会更新表.

component

    <template>
//..
    <div class="table-responsive" >
       <v-client-table ref="table" name="vCardTable" 
          :data="vCardTableData.data" 
          :columns="vCardTableData.headers" 
          :options="vCardTableData.options"/>
    </div> 
//..
    </template>
<script>
import { mapState } from "vuex";
import { mapGetters } from "vuex";

export default {
  name: "VCard",
  computed: {
    ...mapState("commons", ["user"]),
    ...mapGetters({ vCardTableData: "vCard/vCardTableData" })
  },
  mounted() {
    var self = this;
    self.$nextTick(() => {
      self.$store.dispatch("vCard/getVCards"); <-- GET TABLE DATA
    });
  }
};
</script>

store

const state = {
    vCardTableData: {
        data: [],
        headers: [
           //..
        ],
        options: {
            filterable: false,
            preserveState: false,
            headings: {
                //..
            },
            texts: {
                //..
            },
            pagination: {
                dropdown: true,
            },
            templates: {
                //..
            },
        },
    }
}

const getters = {
    vCardTableData: state => state.vCardTableData
}

const actions = {
    getVCards({commit, dispatch}) {
            return api.request("get", "getvcards").then(response => {
                setTimeout(() => {  
                    commit("setVCardTableData", response.data.vcards);
                }, 300);
            }).catch(error => {
                console.log(error);
            });
    }
}

const mutations = {
    clearTableData: (state) => {
        if (state.vCardTableData.data) {
            state.vCardTableData.data = [];
        }
    },
    setVCardTableData : (state, vCardTableData) => state.vCardTableData.data = vCardTableData   
}

如图所示，该表包含以下数据:

02/05/2018

现在我已经看到，如果我用promise 直接在组件中修改状态，它就会工作:

this.$store.dispatch("vCard/getVCards", []).then((responseData)=>{
       this.$store.state.vCard.vCardTableData.data = responseData;
  }); 

Does anyone know why?