vue循环数据最后一个不加/不加、

<text v-for="(item, idx) in orderData.tags" :key="item.id">
    <text>{{item}}{{idx === orderData.tags.length-1 ? " ":" / "}}</text>
</text>

重点

idx === orderData.tags.length-1 ? " ":" / "

或者
<el-table-column prop="announceTargetAppList" label="关联应用">
          <template slot-scope="scope">
            {{scope.row.sectionColumnName.length-1 ? '' :  ',' }}
          </template>
</el-table-column>