我嘗試過這樣的事情<script charset="utf-8">    var request = new XMLHttpRequest();    // request.open("POST", "https://localhost:8443/control/jqxGeneralServicer?sname=JQGetListCustomerByCluster&deliveryClusterId=120120", false);    request.open("POST", "https://localhost:8443/control/jqxGeneralServicer?sname=JQGetListCustomerByCluster&deliveryClusterId=${deliveryCluster.deliveryClusterId}", false);        // ${deliveryCluster.deliveryClusterId}    request.setRequestHeader('Content-Type', 'application/json');    request.send(null);    var foo = request.responseText;    var json = JSON.parse(foo);    // console.log(json["results"][0]);    var labels = new Array();    var locations = new Array();    for(i = 0; i < json["results"].length; i++){         labels.push(json["results"][i]["fullName"]);         locacations["lng"] = json["results"][i]["longitude"];         locacations["lat"] = json["results"][i]["latitude"];    }    // console.log(labels) ;           function initMap() {            const map = new google.maps.Map(document.getElementById("map"), {                zoom: 16,                center: {lat: 20.993514917846174, lng: 105.78660475957122},            });            // const labels = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";             //const labels = [            //   "C?a hàng Quang Anh",             //   "C?a hàng Quang Em",             //   "C?a hàng H?ng Th?nh",             //   "C?a hàng C?a hàng Thành H?ng"];            var locations = [                { lat: 20.9935851166474, lng: 105.78857910579417 },                { lat: 20.986910834987295, lng: 105.78535398147808 },                { lat: 20.990339683019226, lng: 105.7922698253056 },                { lat: 20.996770381033244, lng: 105.79321396285934 }                });            });請指導我locations從json數據源設置 var 的值。