html

<i class="icon-span" @click='data' :class="{'icon-span-select' : isShow}"></i><span :class="{'aaa' : isShow}">aaaaa</span>

css

.icon-span{
  display: inline-block;
  background-color: #fff;
  border-radius: 100%;
  border: 1px solid #ccc;
  position: relative;
  width: 30px;
  height: 30px;
  vertical-align: middle;
}
.icon-span::after{
  border: 2px solid transparent;
  border-left: 0;
  border-top: 0;
  content: " ";
  top: 3px;
  left: 8px;
  position: absolute;
  width: 10px;
  height: 16px;
  -webkit-transform: rotate(45deg) scale(0);
  transform: rotate(45deg) scale(0);
  -webkit-transition: -webkit-transform .2s;
  transition: -webkit-transform .2s;
  transition: transform .2s;
  transition: transform .2s, -webkit-transform .2s;
}
.icon-span-select{
  background-color: green;
  border-color: #fff;
}
.icon-span-select::after{
  border-color: #fff;
  -webkit-transform: rotate(45deg) scale(1);
  transform: rotate(45deg) scale(1);
}
.aaa {
    color: red;
}
 

vue中的 js

methods: {
    data () {
      this.isShow = !this.isShow
    }
  }