<template>
 <div style="display: block;" ref="abc">
  <!-- ... -->
 </div>
</template>
<script>
　　export default {
 　　mounted () {
  　　 console.log(this.$refs.abc.style.cssText)
 　　}
　　}
</script>

<template>
 <div ref="nana">
  <!-- ... -->
 </div>
</template>

<script>
export default {
 mounted () {


　　 let w = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
　　 let h = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;

  this.$refs.nana.style.height = h +'px';

　　}

}

</script>