个人在使用 ElementUI Uploader 上传时 , 习惯选中/拖拽文件后预览显示本地文件 , 在提交所有信息时才进行图片上传. 官方 Demo 里关于 文件缩略图 部分 , 删除功能的实现没有写具体 , 此处进行补充

文本转自 链接

Html:

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 <el-form-item label="证件照片" prop="idPhoto">
	<el-upload 
		ref="pictureUpload" 
		action="https://jsonplaceholder.typicode.com/posts/" 
		list-type="picture-card" 
		:auto-upload="false" 
		:on-preview="handlePictureCardPreview"
		:on-remove="handleRemove"
		:limit="2"
	>
		<i slot="default" class="el-icon-plus"></i>
		<div slot="file" slot-scope="{ file }">
			<img class="el-upload-list__item-thumbnail" :src="file.url" alt="" />
                <span class="el-upload-list__item-actions">
                  <span
                    class="el-upload-list__item-preview"
                    @click="handlePictureCardPreview(file)"
                  >
                    <i class="el-icon-zoom-in"></i>
                  </span>
                  <span
                    class="el-upload-list__item-delete"
                    @click="handleDownload(file)"
                  >
                    <i class="el-icon-download"></i>
                  </span>
                  <span
                    class="el-upload-list__item-delete"
                    @click="handleRemove(file)"
                  >
                    <i class="el-icon-delete"></i>
				</span>
			</span>
		</div>
	</el-upload>
	  <!-- 1、预览 -->
	<el-dialog :visible.sync="dialogVisible">
		<img width="100%" :src="dialogImageUrl" alt="预览图片" />
	</el-dialog>
</el-form-item>

JS:

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// 2、下载
handleDownload(file) {
       window.open(file.url)
},
// 3、删除--根据 url 的不同进行匹配删除
handleRemove(file) {
       let uploadFiles = this.$refs.pictureUpload.uploadFiles
       for (var i = 0; i < uploadFiles.length; i++) {
         if (uploadFiles[i]['url'] == file.url) {
           uploadFiles.splice(i, 1)
         }
       }
},
// 点击文件列表中已上传的文件时的钩子
handlePictureCardPreview(file) {
       this.dialogImageUrl = file.url
       this.dialogVisible = true
},