vue-router 创建视图的三种方式

<template>
    <div>
             <transition name="fade">
                 <router-view></router-view>
             </transition>
              <router-link :to="'a'"  >to a</router-link>
              <router-link :to="{path:'/b'}"  >to b</router-link>
              <router-link :to="{name:'aPage'}">re</router-link>
    </div>
</template>