鼠标悬浮显示鼠标停留数据的内容

<el-tabs v-model="activeName" @tab-click="handleClick">
                <el-tab-pane :label="speaker.abscissa[0]" name="first">
                  <div
                    class="list"
                    v-for="(item, index) in newUserList"
                    :key="index"
                    style="width:302px"
                    v-loading="newUserList ? false : true"
                    @mouseover="setMouseOver(item, $event)"
                    @mouseout="setMouseOut()"
                    @click="pushRealList(item, speaker.title)"
                  >
                    <span class="index" :class="‘index‘ + (index + 1)">{{
                      index + 1
                    }}</span>
                    <div class="label">
                      <div class="name">
                        <el-badge value="new" class="item">
                          <el-popover
                            placement="top-start"
                            trigger="hover"
                            :content="popoverContent"
                          >
                            <h4 slot="reference">{{ item.name }}</h4>
                          </el-popover>
                        </el-badge>
                      </div>
                    </div>
                    <div class="value">
                      <h4>{{ item.num }}次</h4>
                    </div>
                  </div>
                  <div class="list" v-show="!newUserList" style="width:350px">
                    无数据
                  </div></el-tab-pane
                >

    setMouseOver: function(item, $event) {
      // const selectedOption = $event.fromElement.innerText.split(/[\s\n]/)
      this.popoverContent = item.name
    },
    setMouseOut() {
      // console.log(this.popoverContent)
    },