element-ui upload组件多文件上传的示例代码

之前有一篇写的如何同时传递form表单及upload组件文件，如果有多个upload文件该如何传递呢

上代码

html

<el-form ref="newform" :model="newform" :rules="rules">    <el-form-item prop="expName" label="">     <el-input v-model="newform.expName" placeholder="" style="width:75%">     </el-input>    </el-form-item>    <el-form-item prop="expSn" label="">     <el-input v-model="newform.expSn" placeholder="" style="width:75%">     </el-input>    </el-form-item>    <el-form-item label='' prop="groupName">     <el-select v-model="newform.groupName" placeholder="" style="width:75%" @change="newSelectGroup($event)">      <el-option      v-for="item in groupOptions"      :key="item.groupId"      :label="item.groupName"      :value="item.groupId">      </el-option>     </el-select>    </el-form-item>    <el-form-item label="" prop="subGroupName">     <el-select v-model="newform.subGroupName" placeholder="" style="width:75%" @change="newSelectSubGroup($event)">      <el-option      v-for="item in subGroupOptions"      :key="item.subGroupId"      :label="item.subGroupName"      :value="item.subGroupId">      </el-option>     </el-select>    </el-form-item>    <el-form-item label="" prop="expvmDifficulty">     <el-rate v-model="newform.expvmDifficulty" :max="5" style="line-height: 2;"></el-rate>    </el-form-item>    <el-form-item label="" prop="expvmInstruction">     <el-upload      class="upload-demo"      drag      ref="uploadhtml"      :action="upload_url"      :auto-upload="false"      :before-upload="newHtml"      accept=".html, .htm">      <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>      <div slot="tip" class="el-upload__tip">实验信息上传，只能传(.html/.htm)文件</div>     </el-upload>    </el-form-item>    <el-form-item label="" prop="expvmFiles">     <el-upload      class="upload-demo"      drag      ref="uploadfile"      :action="upload_url"      :auto-upload="false"      :before-upload="newFiles"      multiple>      <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>      <div slot="tip" class="el-upload__tip">实验信息附件上传，只能传(.file)文件</div>     </el-upload>    </el-form-item>    <el-form-item label="" prop="expvmVideo">     <el-upload      class="upload-demo"      drag      ref="uploadvideo"      :action="upload_url"      :auto-upload="false"      :before-upload="newVideo"      accept=".mp4">      <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>      <div slot="tip" class="el-upload__tip">实验视频上传，只能传(.mp4)文件</div>     </el-upload>    </el-form-item>    <el-form-item style="text-align:center">     <el-button type="primary" @click="newSubmitForm()" class="yes-btn">     确 定     </el-button>     <el-button @click="resetForm('newform')">     重 置     </el-button>    </el-form-item>   </el-form>