arcgis server 中Web墨卡托投影与WGS

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;