elementui上传文件不允许重名的解决方案

//上传文件
    uploadFile() {
      let _this = this;
      // 未选择文件
      if (_this.fileLength === 0) {
        _this.$message({
          message: '请先选择 [文件] 后在点击上传!',
          type: 'warning'
        });
        return;
      }
      // 检查重名文件
      let fileListForm = new FormData();
      let noUploadFileList = []; //不覆盖上传的
      const arrayList = _this.fileList.map(file => file.name);
      console.log("将要上传的文件名:", arrayList);
      arrayList.forEach(fileName => {
        fileListForm.append("file_name", fileName); 
      });
      let fileListConfig = {
        method: 'post',
        url: _this.checkFiles,
        headers: {
          "Content-Type": "multipart/form-data;charset=utf-8",
        },
        data: fileListForm
      };
      _this.$ajax(fileListConfig)
        .then(async res => {
          console.log("检查是否重复:", res.data);
          let repeatArray = res.data; // 后端返回重复文件名数组
          if (repeatArray.length > 0) {
            for (const file of repeatArray) {
              await _this.deleteRepeat(file, noUploadFileList);
            }
          }
          console.log("noUploadFileList:", noUploadFileList);
          //进行上传
          //删除不覆盖上传的文件
          _this.fileList = _this.fileList.filter(file => !noUploadFileList.includes(file.name));
          console.log("新的上传列表：", _this.fileList);
          _this.fileLength = _this.fileList.length;
          if (_this.fileLength === 0) {
            return;
          }
          //进行上传
          await _this.performUpload();
        })
        .catch(err => {
          console.log(err);
        });
    },

//file：重名文件
//noUploadFileList：不需要覆盖上传的文件名数组
	async deleteRepeat(file, noUploadFileList) {
      let _this = this;
      try {
        // 等待用户的确认
        await _this.$confirm(file + '文件已上传至服务器, 是否覆盖上传?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        });
        // 如果await下面的代码执行了，意味着用户确认覆盖
        _this.$message({
          type: 'success',
          message: '覆盖文件成功!'
        });
      } catch (error) {
        // 如果进入catch块，意味着用户点击了取消
        _this.$message({
          type: 'success',
          message: '已取消文件覆盖!'
        });
        noUploadFileList.push(file);
      }
    },

performUpload() {
      let _this = this;
      // 配置请求的相关参数
      //loading开启
      _this.is_loading = true
      //配置请求的相关参数
      let formData = new FormData()
      let config = {
        method: 'post',
        url: this.uploadUrl,
        headers: {
          "Content-Type": "multipart/form-data;charset=utf-8",
        },
        data: formData
      }
      console.log("正在上传：", _this.fileList);
      //单个文件，可编辑作者和文件密级
      if (_this.fileLength === 1) {
        formData.append("file", _this.fileList[0].raw)
        formData.append("author", _this.edit_author)
        //默认编写人为空，密级为非密
        if (_this.secret_level === '') {
          _this.secret_level = 0
        }
        formData.append("confidentiality", _this.secret_level)
      }
      //多文件
      if (_this.fileLength > 1) {
        _this.fileList.forEach(file => {
          formData.append("file", _this.fileList.raw)
          formData.append("author", _this.edit_author)
          formData.append("confidentiality", 0)
        })
      }
      //请求后端
      _this.$ajax(config)
        .then(res => {
          // console.log(res)
          if (res) {
            _this.is_loading = false
            _this.is_done = true
            if (_this.is_done) {
              console.log("上传成功！！！！！");
              _this.$message({
                message: '上传成功',
                type: 'success'
              });
              _this.fileList = []
              _this.show = true
            }
            _this.edit_author = ''
            _this.secret_level = ''
          } else {
            _this.is_loading = false
            _this.$message.error('后台连接错误');
            _this.fileList = []
            console.log("res failed")
          }
        })
        .catch(err => {
          _this.is_loading = false
          _this.$message.error('后台连接错误');
          console.log(err)
        })
    },