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) 可獲得定位信息對象");    };  var self = this;  if (navigator.geolocation) {    //瀏覽器支持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 {    //瀏覽器不支持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("暫時獲取不到位置信息");      break;    case 3:      alert("獲取信息超時");      break;    case 4:      alert("未知錯誤");      break;  }};//調用var local = new Location();local.getLocation(function(res){  //此處就是返回的地理位置信息  console.log(res);})