GPS坐标单个和批量转为百度地图坐标（WGS84转BD-09）的方法，百度已经提供了相关接口，如下：
http://developer.baidu.com/map/jsdemo/demo/convertor.js 这是单个坐标转换接口
http://developer.baidu.com/map/jsdemo/demo/changeMore.js 这是批量转换接口
下面是上面两个接口的详细代码：
批量转换函数
//2011-7-25 zhangying
(function(){
function load_script(xyUrl, callback){
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = xyUrl;
//借鉴了jQuery的script跨域方法
script.onload = script.onreadystatechange = function(){
if((!this.readyState || this.readyState === "loaded" || this.readyState === "complete")){
callback && callback();
// Handle memory leak in IE
script.onload = script.onreadystatechange = null;
if ( head && script.parentNode ) {
head.removeChild( script );
}
}
};
// Use insertBefore instead of appendChild to circumvent an IE6 bug.
head.insertBefore( script, head.firstChild );
}
function transMore(points,type,callback){
var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from=" + type + "&to=4&mode=1";
var xs = [];
var ys = [];
var maxCnt = 20;//每次发送的最大个数
var send = function(){
var url = xyUrl + "&x=" + xs.join(",") + "&y=" + ys.join(",") + "&callback=callback";
//动态创建script标签
load_script(url);
xs = [];
ys = [];
}
for(var index in points){
if(index % maxCnt == 0 && index != 0){
send();
}
xs.push(points[index].lng);
ys.push(points[index].lat);
if(index == points.length - 1){
send();
}
}
}
window.BMap = window.BMap || {};
BMap.Convertor = {};
BMap.Convertor.transMore = transMore;
})();
单个转换函数
//2011-7-25
(function(){ //闭包
function load_script(xyUrl, callback){
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = xyUrl;
//借鉴了jQuery的script跨域方法
script.onload = script.onreadystatechange = function(){
if((!this.readyState || this.readyState === "loaded" || this.readyState === "complete")){
callback && callback();
// Handle memory leak in IE
script.onload = script.onreadystatechange = null;
if ( head && script.parentNode ) {
head.removeChild( script );
}
}
};
// Use insertBefore instead of appendChild to circumvent an IE6 bug.
head.insertBefore( script, head.firstChild );
}
function translate(point,type,callback){
var callbackName = 'cbk_' + Math.round(Math.random() * 10000); //随机函数名
var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from="+ type + "&to=4&x=" + point.lng + "&y=" + point.lat + "&callback=BMap.Convertor." + callbackName;
//动态创建script标签
load_script(xyUrl);
BMap.Convertor[callbackName] = function(xyResult){
delete BMap.Convertor[callbackName]; //调用完需要删除改函数
var point = new BMap.Point(xyResult.x, xyResult.y);
callback && callback(point);
}
}
window.BMap = window.BMap || {};
BMap.Convertor = {};
BMap.Convertor.translate = translate;
})();
今天在网页中有一个函数想转换单个的，有一个函数想批量转换，把这两个都引用进项目后，出现了错误，后面分析源代码之后，找出了原因，在于最后三个语句，他们都是相同的，后面一个加入的覆盖了前面一个，所以造成总有一个接口使用不了因此，我把这两个接口合二为一，把源代码引用到自己的项目中，解决了问题：
二合一之后的源代码
(function(){ //闭包
function load_script(xyUrl, callback){
var head = document.getElementsByTagName('head')[0];
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = xyUrl;
//借鉴了jQuery的script跨域方法
script.onload = script.onreadystatechange = function(){
if((!this.readyState || this.readyState === "loaded" || this.readyState === "complete")){
callback && callback();
// Handle memory leak in IE
script.onload = script.onreadystatechange = null;
if ( head && script.parentNode ) {
head.removeChild( script );
}
}
};
// Use insertBefore instead of appendChild to circumvent an IE6 bug.
head.insertBefore( script, head.firstChild );
}
function translate(point,type,callback){//单个转换
var callbackName = 'cbk_' + Math.round(Math.random() * 10000); //随机函数名
var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from="+ type + "&to=4&x=" + point.lng + "&y=" + point.lat + "&callback=BMap.Convertor." + callbackName;
//动态创建script标签
load_script(xyUrl);
BMap.Convertor[callbackName] = function(xyResult){
delete BMap.Convertor[callbackName]; //调用完需要删除改函数
var point = new BMap.Point(xyResult.x, xyResult.y);
callback && callback(point);
};
}
function transMore(points,type,callback){//批量转换
var xyUrl = "http://api.map.baidu.com/ag/coord/convert?from=" + type + "&to=4&mode=1";
var xs = [];
var ys = [];
var maxCnt = 30;//每次发送的最大个数
var send = function(){
var url = xyUrl + "&x=" + xs.join(",") + "&y=" + ys.join(",") + "&callback=callback";
//动态创建script标签
load_script(url);
xs = [];
ys = [];
};
for(var index in points){
if(index % maxCnt == 0 && index != 0){
send();
}
xs.push(points[index].lng);
ys.push(points[index].lat);
if(index == points.length - 1){
send();
}
}
}
window.BMap = window.BMap || {};
BMap.Convertor = {};
BMap.Convertor.translate = translate;
BMap.Convertor.transMore = transMore;
})();
另外附上两个接口使用的示例源代码单个转换的接口
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;}
</style>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密钥"></script>
<script type="text/javascript" src="http://developer.baidu.com/map/jsdemo/demo/convertor.js"></script>
<title>GPS转百度</title>
</head>
<body>
<div id="allmap"></div>
</body>
</html>
<script type="text/javascript">
// 百度地图API功能
//GPS坐标
var xx = 116.397428;
var yy = 39.90923;
var gpsPoint = new BMap.Point(xx,yy);
//地图初始化
var bm = new BMap.Map("allmap");
bm.centerAndZoom(gpsPoint, 15);
bm.addControl(new BMap.NavigationControl());
//添加谷歌marker和label
var markergps = new BMap.Marker(gpsPoint);
bm.addOverlay(markergps); //添加GPS标注
var labelgps = new BMap.Label("我是GPS标注哦",{offset:new BMap.Size(20,-10)});
markergps.setLabel(labelgps); //添加GPS标注
//坐标转换完之后的回调函数
translateCallback = function (point){
var marker = new BMap.Marker(point);
bm.addOverlay(marker);
var label = new BMap.Label("我是百度标注哦",{offset:new BMap.Size(20,-10)});
marker.setLabel(label); //添加百度label
bm.setCenter(point);
alert(point.lng + "," + point.lat);
}
setTimeout(function(){
BMap.Convertor.translate(gpsPoint,0,translateCallback); //真实经纬度转成百度坐标
}, 2000);
</script>
批量转换的示例接口
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
body, html,#allmap {width: 100%;height: 100%;overflow: hidden;margin:0;}
</style>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密钥"></script>
<script type="text/javascript" src="http://developer.baidu.com/map/jsdemo/demo/changeMore.js"></script>
<title>批量坐标转换</title>
</head>
<body>
<div id="allmap"></div>
</body>
</html>
<script type="text/javascript">
// 百度地图API功能
var map = new BMap.Map("allmap");
map.centerAndZoom(new BMap.Point(116.404, 39.915), 15);
var i;
var markers = [];
map.addEventListener("click",function(e){
alert(e.point.lng + "," + e.point.lat);
});
//注意：百度和谷歌的经纬度坐标顺序是相反的。
var points = [new BMap.Point(116.3786889372559,39.90762965106183),
new BMap.Point(116.38632786853032,39.90795884517671),
new BMap.Point(116.39534009082035,39.907432133833574),
new BMap.Point(116.40624058825688,39.90789300648029),
new BMap.Point(116.41413701159672,39.90795884517671)
];
function callback(xyResults){
var xyResult = null;
for(var index in xyResults){
xyResult = xyResults[index];
if(xyResult.error != 0){continue;}//出错就直接返回;
var point = new BMap.Point(xyResult.x, xyResult.y);
var marker = new BMap.Marker(point);
map.addOverlay(marker);
map.setCenter(point);// 由于写了这句，每一个被设置的点都是中心点的过程
}
}
setTimeout(function(){
BMap.Convertor.transMore(points,2,callback); //一秒之后开始进行坐标转换。参数2，表示是从GCJ-02坐标到百度坐标。参数0，表示是从GPS到百度坐标
}, 1000);
</script>
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