<el-menu :default-active="this.$route.path" class="el-menu-vertical-demo left" router>
        <el-menu-item index="/index" >
          <template #title>
            <i class="el-icon-document-copy"></i>
            <span class="m-text">数据汇总</span>
          </template>
        </el-menu-item>
        <el-submenu index="2">
          <template #title>
            <i class="el-icon-document-copy"></i>
            <span class="m-text">文章管理</span>
          </template>
          <el-menu-item index="/index/listArticle"  style="padding-left: 5em">
            <i class="el-icon-tickets"></i>
            <span>文章列表</span>
          </el-menu-item>
          <el-menu-item index="/index/addArticle" style="padding-left: 5em" >
            <i class="el-icon-edit-outline"></i>
            <span>添加文章</span>
          </el-menu-item>
        </el-submenu>
        <el-menu-item index="3">
          <template #title>
            <i class="el-icon-document-copy"></i>
            <span class="m-text">标签管理</span>
          </template>
        </el-menu-item>

      </el-menu>