vue 循环多个标签，点击标签变色，再点击取消，可以同时点击多个

效果：

<div class="relFacilityTitcon">
          <i v-for="(item,index) in facilityList" :key="index" @click="changeSpan(index);" :class="{'bgcolor':spanIndex.indexOf(index)>-1}" >{{item}}</i>
</div>

data:{

spanIndex:[],

}

methods: {

            changeSpan(index){
                let arrIndex = this.spanIndex.indexOf(index);
                // console.log(arrIndex);

                if(arrIndex>-1){
                    this.spanIndex.splice(arrIndex,1);
                }else{
                    this.spanIndex.push(index);
                }
            },