vue-cli 3.0 通过 vuex.store 及 router.beforeEach 实现控制 主页面 tab-mune.active

最新使用vue-cli 3.0 重构公司H5商城，需要实现一个主页面底部 app-tab-menu(控制首页、我的等页面的菜单导航)

QQ图片20190621150343.png

以下即时简单的实现代码：

//
// App.vue
//
<template>
  <div id="app">
    <router-view/>
    <div class="app-tab-menu" v-show="showAppTabMenu">
      <router-link :to="{path:item.path}" class="app-tab-menu-item" v-bind:class="[item.pathName==currentPageName?'active':'']" v-for="item in appTabMenu">
        <span  class="icon" v-bind:class="[item.iconClass,item.pathName==currentPageName?'active':'']"></span>
        <p class="name">{{item.name}}</p>
      </router-link>
    </div>
  </div>
</template>
<script>
  export default {
    name: 'App',
    data() {
      return {
        appTabMenu:[
          {name:'首页',pathName:'home',path:'/',iconClass:'icon-app-tab-menu-home'},
          {name:'我的',pathName:'about',path:'/about',iconClass:'icon-app-tab-menu-my'},
        ],
      }
    },
    computed:{
      currentPageName(){ // 监听 store.state.currentPageName 的改变
        return this.$store.state.currentPageName;
      },
      showAppTabMenu(){ //  store.state.currentPageName 改变时，重新判断 app-tab-menu 是否需要显示
        let current = this.$store.state.currentPageName;
        let arr =this.appTabMenu.filter((v,i)=>{
          return v.pathName == current;
        });
        return arr.length;
      },
    },
    created() {
      console.log('App.vue created()');
    },
  }
</script>

//
// store.js
//
import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    currentPageName:'',// store.state.currentPageName  是 app-tab-menu 是否显示判断的关键
  },
  mutations: {
    updatePageName(state,name){
      if(typeof name == 'string' && name.length>0){
        state.currentPageName = name;
      }
    }
  },
})

//
// router.js
//
import Vue from 'vue'
import Router from 'vue-router'
import Home from './views/Home.vue'
import store from './store'

Vue.use(Router);

let router =  new Router({
  mode: 'history',
  base: process.env.BASE_URL,
  routes: [
    {
      path: '*',
      name: '404',
      component: () => import(/* webpackChunkName: "404" */ './views/404.vue')
    },
    {
      path: '',
      name: 'null',
      redirect: { name: 'home' }
    },
    {
      path: '/',
      name: 'home',
      component: Home
    },
    {
      path: '/about',
      name: 'about',
      // route level code-splitting
      // this generates a separate chunk (about.[hash].js) for this route
      // which is lazy-loaded when the route is visited.
      component: () => import(/* webpackChunkName: "about" */ './views/About.vue')
    }
  ]
});

router.beforeEach((to,from,next)=>{
  console.log(`${from.name} ==>> ${to.name}`);
  store.commit('updatePageName',to.name);//路由改变时，显式的改变 store.state.currentPageName 状态值
  next();
});
export default router;