How to use 'datatables export selected columns' in JavaScript

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private getColumnHeaders(columns: Column[]): KeyTitlePair[] {
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  if (!columns || !Array.isArray(columns) || columns.length === 0) {
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    return null;
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  }
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  const columnHeaders = [];
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  // Populate the Column Header, pull the name defined
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  columns.forEach((columnDef) => {
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    let headerTitle = '';
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    if (columnDef.headerKey && this._gridOptions.enableTranslate && this.translate && this.translate.instant) {
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      headerTitle = this.translate.instant(columnDef.headerKey);
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    } else {
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      headerTitle = columnDef.name || titleCase(columnDef.field);
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    }
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    const skippedField = columnDef.excludeFromExport || false;
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    // if column width is 0, then we consider that field as a hidden field and should not be part of the export
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    if ((columnDef.width === undefined || columnDef.width > 0) && !skippedField) {
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      columnHeaders.push({
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        key: columnDef.field || columnDef.id,
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        title: headerTitle
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      });
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    }
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  });
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  return columnHeaders;
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}