npm install angular-file-upload

<input type="file" nv-file-select uploader="uploader"/>

// 新建文件上传实例
self.uploader = new FileUploader();

// 重写文件添加后的方法
self.uploader.onAfterAddingFile = function(fileItem) {
  // 打印日志
  if (config.debug) { console.info('onAfterAddingFile', fileItem); }
  // 上传文件
  self.upload(fileItem);
};

// 传给视图
$scope.uploader = self.uploader;

// 上传文件
self.upload = function(data) {
  // 上传文件
  AttachmentService.uploadFile(data._file)
    .then(function success(response) {
        // 将上传成功的附件绑定再ngModel中
        $scope.ngModel = response.data;
        // 显示上传按钮
        self.showClear();
      }, function error() {
        // 提示用户上传失败
        sweetAlert.swal({
          title: "对不起",
          text: "上传的附件不能大于1M，请确认附件是否大于1M"
        });
      });
};

// 清空选中文件
self.clear = function() {
  self.deleteFile(scope.ngModel.id);
};

// 删除附件
self.deleteFile = function(id) {
  AttachmentService.deleteFile(id, function success() {
    // 将附件赋为空对象
    scope.ngModel = undefined;
    // 隐藏清空按钮
    self.hideClear();
  });
};

scope.clear = self.clear;

<form name="formInner" novalidate>
  <fieldset>
    <label class="col-sm-4 control-label">附件</label>
    <div class="col-sm-4">
      <input type="file" nv-file-select uploader="uploader"/>
    </div>
    <div class="col-md-4">
      <button type="reset" ng-if="params.showClearOrNot" ng-click="clear()" class="btn btn-xs btn-default">清除</button>
    </div>
  </fieldset>
</form>

<form>
  <input ng-model="xxx" />
  <yunzhi-upload-file ng-model="work.apply.attachment"></yunzhi-upload-file>
</form>