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gridView.setFooter({
  "count" : 2,
  "height" : 50
});

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var columns = [{
...
    "name": "QuantityPerUnit",
    "fieldName": "QuantityPerUnit",
    "type": "data",
    "width": "140",
    "styles": {
        "textAlignment": "near"
    },
    "header": {
        "text": "Quantity / Unit"
    },
    "footer": {
        "styles": {
            "textAlignment": "far",
            "font": "굴림,12"
        },
        "text": ["합계 =>", "평균 =>"],    //<<-- 문자열
        "groupText": "합계 =>"
    }
}, {
    "name": "Quantity",
    "fieldName": "Quantity",
    "type": "data",
    "width": "100",
    "styles": {
        "textAlignment": "far"
    },
    "header": {
        "text": "Quantity"
    },
    "footer": {
        "styles": { 
            "textAlignment": "far",
            "numberFormat": "#,##0",
            "suffix": " $", 
            "font": "Arial,12"
            },
        "expression": ["sum", "avg"],   //<<-- 수식  
        "groupExpression": "sum"
    }
}, {
...
}];

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gridView.setFooter({
  "count" : 3,
  "height" : 75
});

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var footer = gridView.getColumnProperty("QuantityPerUnit", "footer");
footer.text = ["합계 =>", "평균 =>", "표준편차 =>"];

gridView.setColumnProperty("QuantityPerUnit", "footer", footer);  

footer = gridView.getColumnProperty("Quantity", "footer");
footer.expression = ["sum", "avg", "stdev"];

gridView.setColumnProperty("Quantity", "footer", footer);  

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gridView.setColumnProperty("Quantity","footer", {
    styles:[{
        background:"#ffffff00",
        textAlignment:"far",
        numberFormat:"#,##0.#"
    },{
        background:"#ff00ffff",
        textAlignment:"far",
        numberFormat:"#,##0.##"
    },{
        background:"#ff11ff55",
        textAlignment:"far",
        numberFormat:"#,##0.###"
    }]
});

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gridView.setFooter({styles:[{
        background:"#ffffff00"
    },{
        background:"#ff00ffff"
    },{
        background:"#ff11ff55"
    }]
})