在添加时正常，但在编辑时，后端返回了图片url，我怎么把它显示上去？（添加时不是立刻上传的，而是用file.url暂时展示的，后面手动提交才上传）

<el-upload class="upload-box" action="" list-type="picture-card" :auto-upload="false" :limit="3" :on-exceed="handleExceed" :on-change="uploadChange" ref="upload">
    <i slot="default" class="el-icon-plus"></i>
    <div slot="file" slot-scope="{file}">
        <img class="el-upload-list__item-thumbnail" :src="file.url">
        <span class="el-upload-list__item-actions">
           <span class="el-upload-list__item-preview" @click="handlePreview(file)">
               <i class="el-icon-zoom-in"></i>
           </span>
           <span class="el-upload-list__item-delete" @click="handleRemove(file)">
                <i class="el-icon-delete"></i>
           </span>
         </span>
     </div>
</el-upload>

qq_43206157

mysql数据库设置编号UUID怎么使用？

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