一、调用例子：
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>coordTransform</title></head><body><h1>请按F12打开控制台查看结果</h1><script src="coordtransform.js"></script><script>//国测局坐标(火星坐标,比如高德地图在用),百度坐标,wgs84坐标(谷歌国外以及绝大部分国外在线地图使用的坐标)//百度经纬度坐标转国测局坐标var bd09togcj02 = coordtransform.bd09togcj02(116.404, 39.915);//国测局坐标转百度经纬度坐标var gcj02tobd09 = coordtransform.gcj02tobd09(116.404, 39.915);//wgs84转国测局坐标var wgs84togcj02 = coordtransform.wgs84togcj02(116.404, 39.915);//国测局坐标转wgs84坐标var gcj02towgs84 = coordtransform.gcj02towgs84(116.404, 39.915);console.log(bd09togcj02);console.log(gcj02tobd09);console.log(wgs84togcj02);console.log(gcj02towgs84);//result//bd09togcj02: [ 116.39762729119315, 39.90865673957631 ]//gcj02tobd09: [ 116.41036949371029, 39.92133699351021 ]//wgs84togcj02: [ 116.41024449916938, 39.91640428150164 ]//gcj02towgs84: [ 116.39775550083061, 39.91359571849836 ]</script></body></html>
二、相关函数
coordtransform.js
/*** Created by Wandergis on /7/8.* 提供了百度坐标（BD09）、国测局坐标（火星坐标，GCJ02）、和WGS84坐标系之间的转换* coordtransform.js*///UMD魔法代码// if the module has no dependencies, the above pattern can be simplified to(function (root, factory) {if (typeof define === 'function' && define.amd) {// AMD. Register as an anonymous module.define([], factory);} else if (typeof module === 'object' && module.exports) {// Node. Does not work with strict CommonJS, but// only CommonJS-like environments that support module.exports,// like Node.module.exports = factory();} else {// Browser globals (root is window)root.coordtransform = factory();}}(this, function () {//定义一些常量var x_PI = 3.14159265358979324 * 3000.0 / 180.0;var PI = 3.1415926535897932384626;var a = 6378245.0;var ee = 0.00669342162296594323;/*** 百度坐标系 (BD-09) 与 火星坐标系 (GCJ-02)的转换* 即 百度 转 谷歌、高德* @param bd_lon* @param bd_lat* @returns {*[]}*/var bd09togcj02 = function bd09togcj02(bd_lon, bd_lat) {var bd_lon = +bd_lon;var bd_lat = +bd_lat;var x = bd_lon - 0.0065;var y = bd_lat - 0.006;var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_PI);var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_PI);var gg_lng = z * Math.cos(theta);var gg_lat = z * Math.sin(theta);return [gg_lng, gg_lat]};/*** 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换* 即谷歌、高德 转 百度* @param lng* @param lat* @returns {*[]}*/var gcj02tobd09 = function gcj02tobd09(lng, lat) {var lat = +lat;var lng = +lng;var z = Math.sqrt(lng * lng + lat * lat) + 0.00002 * Math.sin(lat * x_PI);var theta = Math.atan2(lat, lng) + 0.000003 * Math.cos(lng * x_PI);var bd_lng = z * Math.cos(theta) + 0.0065;var bd_lat = z * Math.sin(theta) + 0.006;return [bd_lng, bd_lat]};/*** WGS84转GCj02* @param lng* @param lat* @returns {*[]}*/var wgs84togcj02 = function wgs84togcj02(lng, lat) {var lat = +lat;var lng = +lng;if (out_of_china(lng, lat)) {return [lng, lat]} else {var dlat = transformlat(lng - 105.0, lat - 35.0);var dlng = transformlng(lng - 105.0, lat - 35.0);var radlat = lat / 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);dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);var mglat = lat + dlat;var mglng = lng + dlng;return [mglng, mglat]}};/*** GCJ02 转换为 WGS84* @param lng* @param lat* @returns {*[]}*/var gcj02towgs84 = function gcj02towgs84(lng, lat) {var lat = +lat;var lng = +lng;if (out_of_china(lng, lat)) {return [lng, lat]} else {var dlat = transformlat(lng - 105.0, lat - 35.0);var dlng = transformlng(lng - 105.0, lat - 35.0);var radlat = lat / 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);dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);var mglat = lat + dlat;var mglng = lng + dlng;return [lng * 2 - mglng, lat * 2 - mglat]}};var transformlat = function transformlat(lng, lat) {var lat = +lat;var lng = +lng;var ret = -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng));ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;ret += (20.0 * Math.sin(lat * PI) + 40.0 * Math.sin(lat / 3.0 * PI)) * 2.0 / 3.0;ret += (160.0 * Math.sin(lat / 12.0 * PI) + 320 * Math.sin(lat * PI / 30.0)) * 2.0 / 3.0;return ret};var transformlng = function transformlng(lng, lat) {var lat = +lat;var lng = +lng;var ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;ret += (20.0 * Math.sin(lng * PI) + 40.0 * Math.sin(lng / 3.0 * PI)) * 2.0 / 3.0;ret += (150.0 * Math.sin(lng / 12.0 * PI) + 300.0 * Math.sin(lng / 30.0 * PI)) * 2.0 / 3.0;return ret};/*** 判断是否在国内，不在国内则不做偏移* @param lng* @param lat* @returns {boolean}*/var out_of_china = function out_of_china(lng, lat) {var lat = +lat;var lng = +lng;// 纬度3.86~53.55,经度73.66~135.05 return !(lng > 73.66 && lng < 135.05 && lat > 3.86 && lat < 53.55);};return {bd09togcj02: bd09togcj02,gcj02tobd09: gcj02tobd09,wgs84togcj02: wgs84togcj02,gcj02towgs84: gcj02towgs84}}));
完！！！
