只需要在图片标签上加入:preview-src-list

  完整代码如下：

<el-table-column label="封面" align="center" prop="cover" :sort-orders="['descending','ascending']" sortable="custom"><template slot-scope="scope"><el-imagev-if="scope.row.cover"style=" height: 50px":src="scope.row.cover":preview-src-list="[scope.row.cover]"></el-image></template>
</el-table-column>