利用HTML5定位功能，实现在百度地图上定位

代码如下：

HTML5定位

*{ margin: 0px; padding: 0px;}

body{text-align: center;  height: 100%;overflow:hidden;}

#allmap{ width: 100%;height: 100%; position: absolute;}

$(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 =

"

";}

else{

var sContent =

"

";

}

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;

})

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。