elenemt，tooltip的多种用法之一

<el-tooltip placement="top" v-for="ar in kuan" :key="ar.id">
        <div slot="content" class="tips-content text-tips-content">
          <div class="rule-box">
            {{ ar.zt }}<br />
            {{ ar.zhanshi }}<br />
            时长:{{ countdown(ar.miaoshu) }}
          </div>
        </div>
        <div
          :style="{
            width: (ar.miaoshu / 86400) * 100 + '%',
            background: ar.ae,
            cursor: 'pointer',
          }"
        ></div>
      </el-tooltip>