参考地址：https://github.com/SortableJS/Vue.Draggable/issues/144icon-default.png?t=LBL2https://github.com/SortableJS/Vue.Draggable/issues/144

1.错误分析

    <!-- 文件列表 -->
    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
           <li :key="file.uid" v-for="(file,index) in fileList"  class="el-upload-list__item ele-upload-list__item-content">
              <el-link :href="file.url" :underline="false" target="_blank">
                <span class="el-icon-document"> {{  file.name }} </span>
              </el-link>
              <div class="ele-upload-list__item-content-action">
                <el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
              </div>
          </li>
      </transition-group>

打印的file的内容，可以看出file.uid 是数字

name: "01-log.png"
status: "success"
uid: 1640826609292
url: "http://127.0.0.1:6070/files/2021-12-30/a528c157ac3b4a3489f8d1e649bfebff.png"

 2.修改办法

将key改为：  :key="''+file.uid"   让key值为字符串即可解决问题


    <!-- 文件列表 -->
    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
           <li :key="''+file.uid" v-for="(file,index) in fileList"  class="el-upload-list__item ele-upload-list__item-content">
              <el-link :href="file.url" :underline="false" target="_blank">
                <span class="el-icon-document"> {{  file.name }} </span>
              </el-link>
              <div class="ele-upload-list__item-content-action">
                <el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
              </div>
          </li>
      </transition-group>

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