使用高德地图做经纬度转换( 把GPS 转高德的经纬度 )

• 自定义经纬度转换

// 要先在页面中引入 WGS84_to_GCJ02.js 才能使用 WGS84_to_GCJ02() 方法
function GPSchange(lngX, latY) {
      var gpsJson = new WGS84_to_GCJ02().transform(
        parseFloat(lngX),
        parseFloat(latY)
      );
      return gpsJson;
}

// WGS84_to_GCJ02.js
var WGS84_to_GCJ02 = function() {}
	WGS84_to_GCJ02.prototype.a = 6378245.0;
	WGS84_to_GCJ02.prototype.ee = 0.00669342162296594323;
	WGS84_to_GCJ02.prototype.transform = function(wgLat, wgLon) {

	    if (this.outOfChina(wgLat, wgLon)) {
	        return [wgLat, wgLon];
	    }

	    dLat = this.transformLat(wgLon - 105.0, wgLat - 35.0);
	    dLon = this.transformLon(wgLon - 105.0, wgLat - 35.0);
	    radLat = wgLat / 180.0 * Math.PI;
	    magic = Math.sin(radLat);
	    magic = 1 - this.ee * magic * magic;
	    sqrtMagic = Math.sqrt(magic);
	    dLat = (dLat * 180.0) / ((this.a * (1 - this.ee)) / (magic * sqrtMagic) * Math.PI);
	    dLon = (dLon * 180.0) / (this.a / sqrtMagic * Math.cos(radLat) * Math.PI);
	    mgLat = wgLat + dLat;
	    mgLon = wgLon + dLon;

	    return [mgLat, mgLon];

	};

	WGS84_to_GCJ02.prototype.outOfChina = function(lat, lon) {

	    if (lon < 72.004 || lon > 137.8347)
	        return true;
	    if (lat < 0.8293 || lat > 55.8271)
	        return true;

	    return false;

	};

	WGS84_to_GCJ02.prototype.transformLat = function(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 * Math.PI) + 20.0 * Math.sin(2.0 * x * Math.PI)) * 2.0 / 3.0;
	    ret += (20.0 * Math.sin(y * Math.PI) + 40.0 * Math.sin(y / 3.0 * Math.PI)) * 2.0 / 3.0;
	    ret += (160.0 * Math.sin(y / 12.0 * Math.PI) + 320 * Math.sin(y * Math.PI / 30.0)) * 2.0 / 3.0;

	    return ret;

	};

	WGS84_to_GCJ02.prototype.transformLon = function(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 * Math.PI) + 20.0 * Math.sin(2.0 * x * Math.PI)) * 2.0 / 3.0;
	    ret += (20.0 * Math.sin(x * Math.PI) + 40.0 * Math.sin(x / 3.0 * Math.PI)) * 2.0 / 3.0;
	    ret += (150.0 * Math.sin(x / 12.0 * Math.PI) + 300.0 * Math.sin(x / 30.0 * Math.PI)) * 2.0 / 3.0;

	    return ret;

	};

• 高德自带

new AMap.LngLat(lng, lat);

备注：
高德开发平台 JS API