arcgis server 中Web墨卡托投影与WGS-84坐标的转换

arcgis server 中Web墨卡托投影坐标与WGS-84坐标的转换

   //经纬度转墨卡托
 function lonlat2mercator(lonlat){
var mercator={x:0,y:0};
var x = lonlat.x *20037508.34/180;
 var y = Math.log(Math.tan((90+lonlat.y)*Math.PI/360))/(Math.PI/180);
 y = y *20037508.34/180;
   mercator.x = x;
   mercator.y = y;
  return mercator ;
  }
   //墨卡托转经纬度
   function mercator2lonlat(mercator){
   var lonlat={x:0,y:0};
   var x = mercator.x/20037508.34*180;
   var y = mercator.y/20037508.34*180;
   y= 180/Math.PI*(2*Math.atan(Math.exp(y*Math.PI/180))-Math.PI/2);
  lonlat.x = x;
  lonlat.y = y;
  return lonlat;
  }
 //墨卡托转经纬度定位
 var dx = sGeometry.x / 20037508.34 * 180;
 var dy = sGeometry.y / 20037508.34 * 180;
var M_PI = Math.PI;
 dy = 180 / M_PI * (2 * Math.atan(Math.exp(dy * M_PI / 180)) - M_PI / 2);
 //地理坐标x为:122.10626710683903
 //地理坐标y为:37.48735577057014
 // x=dx;
 // y=dy;