html頁面
<template>
<div>
<router-view></router-view>
<div class="buttom-nav">
<ul :class="{nav:true, home:true, active:homeActive}" @click="goPage('/index')">
<li></li>
<li>首頁</li>
</ul>
<ul :class="{nav:true,cart:true, active:cartActive}" @click="goPage('/cart')">
<li></li>
<li>購物車</li>
<li class="spot"></li>
</ul>
<ul :class="{nav:true,my: true,active:myActive}" @click="goPage('/my')">
<li></li>
<li>我的</li>
</ul>
</div>
</div>
</template>

<script>
export default {
name: "home",
data(){
return {
homeActive:true,
cartActive:false,
myActive:false,
}
},
created(){
this.changeStyle(this.router.replace(url)
this.changeStyle(url)
},
changeStyle(url){
console.log(this.$route)
switch (url) {
case '/index':
this.homeActive=true
this.cartActive=false
this. myActive=false
break;

                case '/cart':
                    this.homeActive=false
                    this.cartActive=true
                    this. myActive=false
                    break

                case '/my':
                    this.homeActive=false
                    this.cartActive=false
                    this. myActive=true
                    break;

                default:
                    this.homeActive=true
                    this.cartActive=false
                    this. myActive=false
            }
        }
    }
}

</script>
// 樣式
<style scoped>
.buttom-nav{
width: 100%;
height:1.2rem;
background-color: #ffffff;
border-top:1px solid #cccccc;
position: fixed;
left:0;
bottom: 0;
display: flex;
justify-content: space-between;
align-items: center;
padding-left: 0.7rem;
padding-right: 0.7rem;
box-sizing: border-box;
}
.buttom-nav .nav{
width: 0.9rem;
position: relative;
}
.buttom-nav .nav li:nth-child(1){
width: 0.6rem;
height: 0.6rem;
margin: 0 auto;
}
.buttom-nav .nav.active li:nth-child(2){
color:#ff0000;

}
.buttom-nav .nav li:nth-child(2){
    width: 100%;
    text-align: center;
    font-size: 0.28rem;
}
.buttom-nav .nav.home li:nth-child(1){
     background-image:url("../../../assets/images/common/home1.png") ;
     background-size:100% ;
     background-position: center;
 }
.buttom-nav .nav.home.active li:nth-child(1){
    background-image:url("../../../assets/images/common/home2.png") ;
    background-size:100% ;
    background-position: center;
}

.buttom-nav .nav.cart li:nth-child(1){
    background-image:url("../../../assets/images/common/cart1.png") ;
    background-size:100% ;
    background-position: center;
}
.buttom-nav .nav.cart.active li:nth-child(1){
    background-image:url("../../../assets/images/common/cart2.png") ;
    background-size:100% ;
    background-position: center;
}

.buttom-nav .nav .spot{
    width:0.2rem ;
    height:0.2rem ;
    background-color: red;
    border-radius: 100%;
    position:absolute;
    right: 0;
    top: 0;
}

.buttom-nav .nav.my li:nth-child(1){
    background-image:url("../../../assets/images/common/my1.png") ;
    background-size:100% ;
    background-position: center;
}
.buttom-nav .nav.my.active li:nth-child(1){
    background-image:url("../../../assets/images/common/my2.png") ;
    background-size:100% ;
    background-position: center;
}

</style>

//配置路由 router.js
import Vue from 'vue';
import Router from 'vue-router';

Vue.use(Router);

import IndexPage from './pages/home/main/index'
import HomeIndex from './pages/home/index/index'
import cartIndex from './pages/home/cart/index'
import myIndex from './pages/user/my/index'

export default new Router({
mode:"hash", //1纽门、hash哈希：有#號饶辙。2登钥、history歷史：沒有#號
base:process.env.BASE_URL, //自動獲取根目錄路徑
routes:[
{
path:"/",
name:"home",
component:IndexPage,
children:[
{
path:"index",
name:"index",
component:HomeIndex
},
{
path:"cart",
name:"cart",
component:cartIndex
},
{
path:"my",
name:"my",
component:myIndex
},
]
},

]

})