h5 定位 微信环境需要调用jsdk

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) 可获得定位信息对象");
		};
	var self = this;
	if (navigator.geolocation) {
		//浏览器支持geolocation
		navigator.geolocation.getCurrentPosition(function(position) {
			//经度
			var longitude = position.coords.longitude;
			//纬度
			var latitude = position.coords.latitude;
			self.loadMapApi(longitude, latitude);
		}, self.onError, options);
	} else {
		//浏览器不支持geolocation
		console.log("浏览器不支持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("位置服务被拒绝");
			break;
		case 2:
			alert("暂时获取不到位置信息");
			break;
		case 3:
			alert("获取信息超时");
			break;
		case 4:
			alert("未知错误");
			break;
	}
};

//调用
var local = new Location();
local.getLocation(function(res) {
	//此处就是返回的地理位置信息
	console.log(res);
	//JSON.stringify(res)，把返回的对象转为字符串了，自己根据需求截取下就好
	var resstr = JSON.stringify(res);
	alert(resstr);
});