1.定义不同的颜色数组

2.html数据遍历-自定义element-走马灯高度+定义css变量-yf-border-color

 <div
            v-for="(item, index) in listData"
            :key="`${index}`"
            :class="`partCurriculum`"
            :style="`color:${colorList[index]};--yf-border-color:${colorList[index]}`"
          >
            <div class="partCurriculumTitle">{{ item.subjectName }}</div>
            <div class="moreLink" style="cursor: pointer;" @click="toDownload">
              更多课件
              <img src="../../assets/img/more_class_btn.png" />
            </div>

            <el-carousel
              trigger="click"
              :autoplay="false"
              class="partCurriculumVideo"
              :height="
                item.courseWaresList[0].length > 6
                  ? '740px'
                  : item.courseWaresList[0].length <= 3
                  ? '250px'
                  : '500px'
              "
            >
              <el-carousel-item
                v-for="(tItem,tIndex) in item.courseWaresList"
                :key="`${tItem}${tIndex}`"
                class="video_connent"
              >
                <div
                  v-for="(LItem,LIndex) in tItem"
                  :class="`videoBlock`"
                  :key="`${LItem}${LIndex}`"
                >
                  <img :src="LItem.coursewareImg" alt="正在加载，请耐心等待" /> 
                </div>
              </el-carousel-item>
            </el-carousel>

3. css添加hover

  .videoBlock {
    position: relative;
    width: 29%;
    height: 220px;
    box-sizing: border-box;
    color: #ccc;
    &:hover {
      border: 4px solid var(--yf-border-color, #4cb352);
    }
    img {
      width: 100%;
      height: 100%;
      display: block;
    }
  }