vue.js实现点击后动态添加class及删除同级class的实

<div class="weui-mask" id="guige">
    <div class="guigeBox">
     <p class="guigeTitle">{{guigeName}}</p>
     <p class="guigeP guigeP01">规格</p>
     <div class="indexGuiGe">
      <span v-for="value,index in guigeList" v-on:click="guige(index)" v-bind:class="{on:index==guigeSpan}">{{value.guige_name}}</span>
     </div>
     <p class="guigeP">口味</p>
     <div class="indexKouwie">
      <span v-for="value,index in kouweiList" v-on:click="kouwei(index)" v-bind:class="{on:index==kouweiSpan}">{{value.guige_name}}</span>
     </div>
    </div>
   </div>

var guige=new Vue({
    el: '#guige',
    data:{
     guigeSpan:"-1", //控制点亮状态 -1为默认不点亮
     kouweiSpan:"-1", //控制点亮状态 
    },
   methods:{
     guige:function(index){ //当点击时候点亮，同级的span标签删除Class
      this.guigeSpan = index;
     },
     kouwei:function(index){
      this.kouweiSpan = index;
     },
    }
   })