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gridView.setHeader({
    summary: {
        visible: true,
        styles: {
            background: "#11ff0000"
        }
    }
})
...
gridView.setColumns([{
    ...
}, {
    "fieldName": "Quantity",
    },
    "header": {
        "text": "Quantity",
        "summary": {
            "styles": {
                "textAlignment": "far",
                "numberFormat": "#,##0",
                "suffix": " $",
                "font": "Arial,12"
            },
            "text": "합계",
            "expression": "sum"
        }
    }
}, {
    ...
}];

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  gridView.setOptions({"summaryMode" : "statistical"});

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  gridView.setOptions({"summaryMode" : "aggregate"});

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  gridView.setOptions({"summaryMode" : "none"});