Vue点击选中（多选）选中右下角有三角形？怎么实现这种选中效果？

 <div class="tag">
                <span class="Classification"
                v-for="(item, index) in tags"
                :class="{active : tabIndex.includes(item) }"
                @click="oncheck(item)">
                    {{item.name}}
                </span>
            </div>
        </template>


oncheck(item) {
            console.log('111111111111', item)
            if (this.tabIndex.includes(item)) {
                this.tabIndex = this.tabIndex.filter(function(ele) {
                    return ele != item
                })
            } else {
                this.tabIndex.push(item)
            }
            console.log('33333333333333', this.tabIndex)

        },



.tag{
    display: inline-block;
    height: auto;
    line-height: 35px;
    cursor: pointer;
    .Classification{
        padding: 6px;
        background: #FFFFFF;
        font-size: 12px;
        font-weight: 400;
        color: #A8AAAF;
        border: 1px solid #D2D5D6;
        margin-right: 8px;
    }
    .active{
        height: 14px;
        margin-right: 8px;
        padding: 6px;
        color: #67C23A;
        border: 1px solid #67C23A;
    }
    .active:before {
        content: '';
        position: absolute;
        right: 0;
        bottom: 0;
        border: 10px solid #67C23A;
        border-top-color: transparent;
        border-left-color: transparent;
    }
    .active:after {
        content: '';
        width: 4px;
        height: 6px;
        position: absolute;
        right: 4px;
        bottom: 3px;
        border: 2px solid #fff;
        border-top-color: transparent;
        border-left-color: transparent;
        transform: rotate(45deg);
    }
}