使用HTML5进行地理位置定位

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Geolocation 对象，Geolocation 与 Google Map 交互 ------ JS
            Mix</title>
    </head>
    <body>
        <input type="button" id="getPos" value="获取我的位置">
        <div id="info" class="">
            您所在的位置： 经度
            <span class="tip">unknown</span>，纬度
            <span class="tip">unknown</span>
        </div>

        <script type="text/javascript">
            var t = 0;
            var dom = {
                btn : document.getElementById('getPos'),
                info : document.getElementById('info')
            };

            dom.btn.onclick = function(){
                if (navigator.geolocation) {
                    dom.info.innerHTML = "请等待查询结果返回";
                    dom.info.className = "warn";
                    navigator.geolocation.getCurrentPosition(getPositionSuccess,getPositionError,{timeout:5000});
                }else {
                     dom.info.innerHTML = "抱歉，您所使用的浏览器不支持 Geolocation 接口";
                     dom.info.className = "warn";
                }
            }
            
            
            function getPositionSuccess(position){
                var lat = position.coords.latitude;
                var lng = position.coords.longitude;
                dom.info.innerHTML = "您所在的位置： 经度" + lat + "，纬度" + lng;
                
                
                if(typeof position.address === "undefined"){
                    dom.info.innerHTML += "<br /><span class='tip'>您的浏览器目前仅提供坐标查询，使用 Firefox 3.5+ 可获得更多信息</span>";
                }else{
                    dom.info.innerHTML += "<br /><span class='tip'>" + position.address.country + " , " + position.address.region + " , " + position.address.city+"</span>";
                }
            }
            
            
            
            function getPositionError(error){
                switch(error.code){
                    case error.TIMEOUT :
                        dom.info.innerHTML = "连接超时，请重试";
                        break;
                    case error.PERMISSION_DENIED :
                        dom.info.innerHTML = "您拒绝了使用位置共享服务，查询已取消";
                        break;
                    case error.POSITION_UNAVAILABLE : 
                        dom.info.innerHTML = "亲爱的火星网友，非常抱歉<br />我们暂时无法为您所在的星球提供位置服务";
                        break;
                }
            }
            
        </script>
    </body>
</html>
参考文献：
http://www.jsmix.com/html5/try-out-geolocation.html