vue实现a标签点击切换高亮方法

<template>
<div id="app">
  <a class="s-bt" @click="selected(1)" :class="{active: active == 1}">aaa</a>
  <a class="s-bt" @click="selected(2)" :class="{active: active == 2}">bbb</a>
</div>
</template>
<script>
export default {
  name: "Analysis",
  data() {
    return {
      active: '1'
    }
  }
},
mounted() {
},
methods: {
  selected(flag) {
    this.active = flag;
  }
}
</script>
<style lang="scss" scoped>
  .active {
    color: red;
    font-size: 17px;
  }
</style>