- var pi = 3.14159265358979324;
- var a = 6378245.0;
- var ee = 0.00669342162296594323;
- function wgs84togcj02(wgLat, wgLon){
- var mgLat, mgLon;
- if (outOfChina(wgLat, wgLon)){
- mgLat = wgLat;
- mgLon = wgLon;
- return;
- }
- var dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
- var dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
- var radLat = wgLat / 180.0 * pi;
- var magic = Math.sin(radLat);
- magic = 1 - ee * magic * magic;
- var sqrtMagic = Math.sqrt(magic);
- dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
- dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
- mgLat = wgLat + dLat;
- mgLon = wgLon + dLon;
- var arr = {};
- arr['lat'] = mgLat;
- arr['lon'] = mgLon;
- return arr;
- }
- //仅适用于北京
- //希望有大神能帮忙把这部分完善
- function gcj02towgs84(mgLat, mgLon){
- var wgLat, wgLon;
- wgLat = mgLat - 0.001243;
- wgLon = mgLon - 0.006155;
- var arr = {};
- arr['lat'] = wgLat;
- arr['lon'] = wgLon;
- return arr;
- }
- function outOfChina(lat,lon) {
- if (lon < 72.004 || lon > 137.8347)
- return true;
- if (lat < 0.8293 || lat > 55.8271)
- return true;
- return false;
- }
- function transformLat(x, y){
- var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
- ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
- ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
- ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
- return ret;
- }
- function transformLon(x, y){
- var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
- ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
- ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
- ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
- return ret;
- }
- console.log("39.933676862706776,116.35608315379092");
- var arr2 = wgs84togcj02(39.933676862706776, 116.35608315379092);
- console.log(arr2['lat']+","+arr2['lon']);
- var arr3 = gcj02towgs84(39.933676862706776, 116.35608315379092);
- console.log(arr3['lat']+","+arr3['lon']);
- //该片段来自于http://www.codesnippet.cn/detail/1112201411253.html
来源: http://www.codesnippet.cn/detail/1112201411253.html