使用vue-router与v-if实现tab切换遇到的问题及解决方法

import Tab1 from './components/tab/TabOne'
import Tab2 from './components/tab/TabTwo'
import Tab3 from './components/tab/TabThree'
import Tab4 from './components/tab/TabFour'
const routes = [
 {path: '/tab1', component: Tab1},
 {path: '/tab2', component: Tab2},
 {path: '/tab3', component: Tab3},
 {path: '/tab4', component: Tab4},
]
const router = new VueRouter({
 routes
})

<div class="tab">
 <router-link to="/tab1">tab1</router-link>
 <router-link to="/tab2">tab2</router-link>
 <router-link to="/tab3">tab3</router-link>
 <router-link to="/tab4">tab4</router-link>
 <router-view></router-view>
</div>

<div class="tab">
 <button @click="handleTab(1)">tab1</button>
 <button @click="handleTab(2)">tab2</button>
 <button @click="handleTab(3)">tab3</button>
 <button @click="handleTab(4)">tab4</button>
 <div v-if="isShow === 1"><Tab1 /></div>
 <div v-if="isShow === 2"><Tab2 /></div>
 <div v-if="isShow === 3"><Tab3 /></div>
 <div v-if="isShow === 4"><Tab4 /></div>
</div>
/**
 * script
 */
 data () {
  return {
   isShow: 1
  }
 },
 methods: {
  handleTab (v) {
   this.isShow = v
  }
 }