= null || appId == '') {
        alert("请选择应用");
        return;
      }
      nodes = $('#bigkey_instance-select').selectpicker('val');
      size = $('#bigkey_size-select').val();
      bytesFrom = $('#bigkey-from-select').val();
      params.push(bytesFrom);
      params.push(size);
    }

    $.post(
            '${request.contextPath}/manage/app/tool/diagnostic/submit.json',
            {
              type: type,
              appId: appId,
              nodes: nodes == null ? "" : nodes.toS