<script src="https//cdn.ksdelivr.net/npm/vue/dist/vue.js"></script>
<div id='app'>
<p v-if="ifshow">ruguo<span>Test</span></p>
<p v-if="test"></p>
<p v-else>ruguoxianshi</p>
<p v-show="ifshow"></p>
<button v-on:click="ifshow=lifshow">xianshi</button>
</div>