GCJ-02/BD-09/WGS-84/Web mercator 坐标转换(高德坐标系/百度坐标系/谷歌坐标系)
varGPS={PI:3.14159265358979324,x_pi:3.14159265358979324*3000.0/180.0,delta:function(lat,lon){//Krasovsky1940////a=6378245.0,1/f=298.3//b=a*(1-f)//ee=(a^2-b^2)/a^2;vara=6378245.0;//a:卫星椭球坐标投影到平面地图坐标系的投