vue.js组件切换

<template id="login">
    <h3>登录组件</h3>
</template>
<template id="register">
    <h3>注册组件</h3>
</template>

<button class="btn btn-success" @click="flag=true">登录</button>
<button class="btn btn-info col-lg-offset-2" @click="flag=false">注册</button>
<login v-if="flag"></login>
<register v-if="!flag"></register>

<component :is="comName"></component>

<transition mode="out-in">
    <component :is="comName"></component>
</transition>