<script type="text/javascript">
function Location() {};

Location.prototype.getLocation = function (callback) {
var options = {
enableHighAccuracy: true,
maximumAge: 1000
};
this.callback = Object.prototype.toString.call(callback) == "[object Function]" ?
callback :
function (address) {
alert(address.province + address.city);
console.log("getocation(callbackFunction) 可獲得定位資訊物件");
};
var self = this;
if (navigator.geolocation) {
//瀏覽器支援geolocation
navigator.geolocation.getCurrentPosition(function (position) {
//經度
var longitude = position.coords.longitude;
//緯度
var latitude = position.coords.latitude;
self.loadMapApi(longitude, latitude);
}, self.onError, options);
} else {
//瀏覽器不支援geolocation
}
};

Location.prototype.loadMapApi = function (longitude, latitude) {
var self = this;
var oHead = document.getElementsByTagName('HEAD').item(0);
var oScript = document.createElement("script");
oScript.type = "text/javascript";
oScript.src = "http://api.map.baidu.com/getscript?v=2.0&ak=A396783ee700cfdb9ba1df281ce36862&services=&t=20140930184510";
oHead.appendChild(oScript);
oScript.onload = function (date) {
var point = new BMap.Point(longitude, latitude);
var gc = new BMap.Geocoder();
gc.getLocation(point, function (rs) {
var addComp = rs.addressComponents;
self.callback(addComp);
});
}
};

Location.prototype.onError = function (error) {
switch (error.code) {
case 1:
alert("位置服務被拒絕");
break;
case 2:
alert("暫時獲取不到位置資訊");
break;
case 3:
alert("獲取資訊超時");
break;
case 4:
alert("未知錯誤");
break;
}
};

//呼叫
var local = new Location();
local.getLocation(function (res) {
//此處就是返回的地理位置資訊
console.log(res);
//JSON.stringify(res)，把返回的物件轉為字串了，自己根據需求擷取下就好
var resstr = JSON.stringify(res);
alert(resstr);
});
</script>