forloop take only last value in javscript

Question

for (var i = 0; i < featureSet.features.length; i++) {

for (var f = 0, f1 = featureTracts.length; f < f1; f++) {

rows["Sensor"] = featureTracts[f].attributes.Sensor;

rows["Resolution"] = featureTracts[f].attributes.Resolution;

rows["Dtofparse"] = featureTracts[f].attributes.Dtofparse;//PATH_ROW

// alert(rows);

}

resosat1[i] = rows;

}