js处理异步问题

function getDrugPrescAttr(ordersDrugWestListPresc, index, callback){
    var doctorOrders = ordersDrugWestListPresc[index];
    var successCallback = function (data) {
        doctorOrders.prescAttr = getDrugPrescAttrDetail(data.toxiCode);
        if (index < ordersDrugWestListPresc.length - 1) {
            getDrugPrescAttr(ordersDrugWestListPresc, ++index, callback);
        } else {
            callback();
        }
    };
    HrUtils.httpRequest($http, Path.getUri("api/inp-orders/get-drug-prescAttr?drugCode=" + doctorOrders.drugOrderDetail.drugCode), successCallback, null, hrDialog, HrUtils.httpMethod.POST, null);
}

getDrugPrescAttr(ordersDrugWestListPresc, 0, function(){
    //查询后处理后续流程
})