效果图 

 实现代码

<el-table-column prop="attachment"  label="合同附件" width="250" show-overflow-tooltip><template slot-scope="scope"><div v-if="scope.row.cceedcAppendixInfoList &&scope.row.cceedcAppendixInfoList.length > 0"><el-button type="text" size="small" v-for="(val, key, i) in scope.row.cceedcAppendixInfoList" :key="i"@click.native.prevent="downContractFile(val)">{{ val.appendixOriginalName }}</el-button></div><div v-else><span>暂无</span></div></template></el-table-column>

    downContractFile(val) {request({url: "/appendix/downloadFile",method: "get",params: {appendixStorageName: val.appendixStorageName,appendixOriginalName: val.appendixOriginalName,},responseType: "blob",}).then((res) => {var filename = val.appendixOriginalName;var downloadElement = document.createElement("a");var href = window.URL.createObjectURL(new Blob([res])); //创建下载的链接downloadElement.href = href;downloadElement.setAttribute("download", filename);document.body.appendChild(downloadElement);downloadElement.click(); //点击下载document.body.removeChild(downloadElement); //下载完成移除元素window.URL.revokeObjectURL(href); //释放掉blob对象});},