利用HTML5定位功能，实现在百度地图上定位
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>HTML5定位</title>
<script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=wqBXfIN3HkpM1AHKWujjCdsi"></script>
<script type="text/javascript" src="http://developer.baidu.com/map/jsdemo/demo/convertor.js"></script>
<style type="text/css">
*{ margin: 0px; padding: 0px;}
body{text-align: center; height: 100%;overflow:hidden;}
#allmap{ width: 100%;height: 100%; position: absolute;}
</style>
</head>
<body>
<div id="allmap"></div>
<script type="text/javascript">
$(function(){
if(supportsGeoLocation()){
alert("你的浏览器支持 GeoLocation.");
}else{
alert("不支持 GeoLocation.")
}
// 检测浏览器是否支持HTML5
function supportsGeoLocation(){
return !!navigator.geolocation;
}
// 单次位置请求执行的函数
function getLocation(){
navigator.geolocation.getCurrentPosition(mapIt,locationError);
}
//定位成功时，执行的函数
function mapIt(position){
var lon = position.coords.longitude;
var lat = position.coords.latitude;
// alert("您位置的经度是："+lon+" 纬度是："+lat);
var map = new BMap.Map("allmap");
var point = new BMap.Point(""+lon+"",""+lat+"");
map.centerAndZoom(point,19);
var gc = new BMap.Geocoder();
translateCallback = function (point){
var marker = new BMap.Marker(point);
map.addOverlay(marker);
map.setCenter(point);
gc.getLocation(point, function(rs){
var addComp = rs.addressComponents;
if(addComp.province!==addComp.city){
var sContent =
"<div><h4 style='margin:0 0 5px 0;padding:0.2em 0'>你当前的位置是：</h4>" +
"<p style='margin:0;line-height:1.5;font-size:13px;text-indent:2em'>"+addComp.province + ", " + addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber+"</p>" +
"</div>";}
else{
var sContent =
"<div><h4 style='margin:0 0 5px 0;padding:0.2em 0'>你当前的位置是：</h4>" +
"<p style='margin:0;line-height:1.5;font-size:13px;text-indent:2em'>"+ addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber+"</p>" +
"</div>";
}
var infoWindow = new BMap.InfoWindow(sContent);
map.openInfoWindow(infoWindow,point);
});
}
BMap.Convertor.translate(point,0,translateCallback);
}
// 定位失败时，执行的函数
function locationError(error)
{
switch(error.code)
{
case error.PERMISSION_DENIED:
alert("User denied the request for Geolocation.");
break;
case error.POSITION_UNAVAILABLE:
alert("Location information is unavailable.");
break;
case error.TIMEOUT:
alert("The request to get user location timed out.");
break;
case error.UNKNOWN_ERROR:
alert("An unknown error occurred.");
break;
}
}
// 页面加载时执行getLocation函数
window.onload = getLocation;
})
</script>
</body>
</html>
测试浏览器：ie11定位成功率100%，Safari定位成功率97%。其它浏览器暂时不行，HTML5获取不了地理位置信息。
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