如何使用javascript根据纬度和经度值设置计算区域？

Question

如何使用javascript根据纬度和经度值设置计算区域？

我有一组从我自己的数据库中提取的纬度和经度值。它们看起来像那样：

 // Define the LatLng coordinates for the polygon's path.
 var fizuliCoords = [
{lng:47.1648244,lat:39.6834661},
{lng:47.1653823,lat:39.6906634},
........there are 400-1200 lines...I only list 2
];
var bakuCoords = [
{lng:47.1648244,lat:39.6834661},
{lng:47.1653823,lat:39.6906634},
........there are 400-1200 lines...I only list 2
];

有69个不同的行政区域

我的项目是：

列出多边形
根据一组lat / long值自动计算面积我是一个新生儿 - 所以请耐心等待我:)我可以从一个名为Expert GPS的程序中提取sqkm的面积，对于已知的shpaes没有问题，但我需要自动脚本。谢谢.....我的道歉，第一个计时器:)

好，

     <!DOCTYPE html>
      <html>
   <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
     <meta charset="utf-8">
     <title>ttttt</title>
     <style>
        html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
 /*   #map is the div that places map on the html page*/
      #map {
        height: 100%;
       }
/*    end of #map */      
    </style>
  </head>
  <body>
    <div id="map"></div>
     <script>
  // This example creates a simple polygon representing the shusha Region.
  //the initMapfunction places the map on the page
   function initMap() {
    var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 8,
    center: {lat: 40.352310, lng: 47.999462},       
    mapTypeId: google.maps.MapTypeId.TERRAIN
  });
//end oof initMap function
//------------------------------------------------------------------
// Define the LatLng coordinates for the Shusha polygon's path.
var shushaCoords = [
{lng:46.5852069,lat:39.7918524},
{lng:46.5810012,lat:39.789016},
{lng:46.5800569,lat:39.7812995},
{lng:46.5741348,lat:39.7757586},
{lng:46.5720748,lat:39.7722619},
{lng:46.571817,lat:39.763026}
];
// Define the LatLng coordinates for the Khojavend polygon's path.
var khojavendCoords = [
{lng:46.6707802,lat:39.5735368},
{lng:46.6646003,lat:39.5704934},
{lng:46.6628837,lat:39.5675823}
];
// Define the LatLng coordinates for the Zangilan polygon's path.
var xocaliCoords = [
{lng:46.6195822,lat:39.233882},
{lng:46.6161489,lat:39.232918},
{lng:46.6094971,lat:39.2322199},
{lng:46.6076088,lat:39.2318542},
{lng:46.6009998,lat:39.229494}
];
**and so on for 69 more areas then come the polygons**

**// Construct the xocali polygon.**
var xocali = new google.maps.Polygon({
    map: map,
    paths: xocaliCoords,
    strokeColor: '#000000',
    strokeOpacity: 0.5,
    strokeWeight: 2,
    fillColor: '#00CCFF',
    fillOpacity: 0.15
  });
**//and then 68 more** 
// Add a listener for the julfa mouseover/mouseout event.
google.maps.event.addListener(julfa ,'mouseover',function(){
this.setOptions({fillColor: "#00FF00"});
}); 
**//here I would like to add a popup where the AREA will be calculated**
google.maps.event.addListener(julfa ,'mouseout',function(){
this.setOptions({fillColor: "#00CCFF"});
});  
//and then 68 more sets of listeners
}
 </script>
<!--end of mapping script-->
<!--the script below is the googleAPI browser script, if i need to display on     the server - must change to Server API code.-->
    <script async defer src="https://maps.googleapis.com/maps/api/js?    key=xxxxxxxxxxxxxxxxx&signed_in=true&callback=initMap"></script>
  </body>
</html>

所以我在这里有3个问题：1。能够构建一个公式，根据每个多边形的lat lng值计算面积2.在弹出窗口中完成此操作3.可以使用外部.js文件