<template> 
 <div> 
  <div id="box" ref="mybox"> 
   DEMO 
  </div> 
 </div> 
</template> 
 
<script> 
export default { 
 data () { 
  return { 
    
  } 
 }, 
 mounted () { 
  this.init(); 
 }, 
 methods:{ 
  init() { 
   const self = this; 
   this.$refs.mybox.style.color = 'red'; 
   setTimeout(() => { 
    self.$refs.mybox.style.color = 'blue'; 
   },2000) 
  } 
 } 
 
} 
</script> 
 
<style scoped> 
 #box { 
  width: 100px; 
  height: 100px; 
  line-height: 100px; 
  font-size: 20px; 
  text-align: center; 
  border: 1px solid black; 
  margin: 50px;  
  color: yellow; 
 } 
</style>