demo组件:
javascript
<template>
<div class="container">
hello world
<template>
hello vue3
</template>
</div>
</template>
<script>
export default {};
</script>
<style scoped lang="less">
</style>
vue2表现:"hello world"、 "hello vue3"均会显示
vue3表现:仅"hello world"均会显示