el-upload 防止选择上传重复文件

<el-uploadref="uploadRef"multipledragaction="":auto-upload="false":file-list="msgPara.MsgFileList":on-change="handleFileChanged"><el-button type="primary">选择文件</el-button></el-upload>

const handleFileChanged = (file, fileList) => { // 检查是否有重复文件，有的话删除新选择的文件if(fileList.findIndex(f=>f.name===file.name)!=fileList.findLastIndex(f=>f.name===file.name)){ElMessage.info(file.name +" 文件已存在")fileList.pop()}msgPara.MsgFileList = fileListconsole.log(msgPara.MsgFileList)}