問題：

解決方式：

<el-table-column label="操作" fixed="right" width="132" align="center">
          <template slot-scope="scope">
            <div v-if="scope.row._index != '合計'">
                <el-dropdown trigger="click" type="primary" style="margin-top:0px;">
                    <div class="el-dropdown-link btn2-icon btn-small-round btn2-bg-blue" type="primary">在線預覽<i class="btnicon-more"></i></div>
                    <el-dropdown-menu slot="dropdown">
                        <!-- <el-dropdown-item @click.native="onlineView(scope.row,'KHXX')">客戶信息表</el-dropdown-item> -->
                        <el-dropdown-item @click.native="onlineView(scope.row,'SPDC')">審批調(diào)查表</el-dropdown-item>
                        <el-dropdown-item @click.native="onlineView(scope.row,'DCBG')">調(diào)查報告</el-dropdown-item>
                    </el-dropdown-menu>
                </el-dropdown>
                <el-dropdown trigger="click" type="primary" style="margin-top:0px;">
                    <div class="el-dropdown-link btn2-icon btn-small-round btn2-bg-blue" type="primary">下載<i class="btnicon-more"></i></div>
                    <el-dropdown-menu slot="dropdown">
                        <!-- <el-dropdown-item @click.native="downloadFile(scope.row,'KHXX')">客戶信息表</el-dropdown-item> -->
                        <el-dropdown-item @click.native="downloadFile(scope.row,'SPDC')">審批調(diào)查表</el-dropdown-item>
                        <el-dropdown-item @click.native="downloadFile(scope.row,'DCBG')">調(diào)查報告</el-dropdown-item>
                    </el-dropdown-menu>
                </el-dropdown>
            </div>
          </template>
        </el-table-column>

給菜單單獨添加樣式進行修改

<style scoped>
  .btn2-icon i{
      display:inline-block; 
      vertical-align:top; 
      margin:2px 2px 0 0; 
      width:20px; 
      height:20px; 
  }
  .btn2-icon i.btnicon-more{
      background:url(/static/img/feature/public/btn-icon-more.png) no-repeat center; 
      background-size:20px;
  }
  .btn2-bg-blue, .btn-bg-blue:hover {
      width: 100px;
      margin-top: 4px;
      background-color: #62a8ea;
      color: #fff;
  }
  </style>

最后效果：

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