el-upload实现 再次上传文件覆盖前面的文件 的效果

使用 :on-change=“handleChange” 来实现文件的覆盖

 <el-upload
                class="upload-demo"
                action=""
                :http-request="uploadPicture"
                :on-preview="handlePreview"
                :on-remove="handleRemoves"
                :before-remove="beforeRemoves"
                :on-error="imgUploadError"
                :file-list="pictureList"
                :on-change="handleChange"
                list-type="xls"
                :limit="2"
                accept=".xlsx">
                <el-button size="small" type="success" :loading="notUpload" style="width:220px;">点击上传</el-button>
              </el-upload>

handleChange(file, fileList) {
        if (fileList.length > 1) {
          fileList[0] = fileList[1]
          fileList.splice(1, 1);
        }
 },