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var newData = [];
var keepItemsCount = 4; //保留的数据量，对其它数据进行合并
var measureName = "数量"; //度量字段名
var dimName = "尺寸"; //维度字段名
var mergeLabel = "其它"; //合并后的数据值

var totalData = 0;
for(var i = 0; i < data.length; i++){
    if(i < (keepItemsCount+1)){
        newData.push(data[i]);
    }else{
        totalData = data[i][measureName] + totalData;
    }
}
newData[keepItemsCount][measureName] = totalData;
newData[keepItemsCount][dimName] = mergeLabel;
data.splice(0,data.length);
for(var i = 0; i < newData.length; i++){
    data.push(newData[i]);
}
return false;