調用騰訊地圖api，在手機端獲取用戶地理位置。

引入<script type="text/javascript" src="https://3gimg.qq.com/lightmap/components/geolocation/geolocation.min.js"></script>

var geolocation = new qq.maps.Geolocation("OB4BZ-D4W3U-B7VVO-4PJWW-6TKDJ-WPB77", "myapp");

document.getElementById("pos-area").style.height = (document.body.clientHeight - 110) + 'px';

var positionNum = 0;
var options = {timeout: 8000};
function showPosition(position) {
    positionNum ++;
    document.getElementById("demo").innerHTML += "序號：" + positionNum;
    document.getElementById("demo").appendChild(document.createElement('pre')).innerHTML = JSON.stringify(position,null,4);
    document.getElementById("pos-area").scrollTop = document.getElementById("pos-area").scrollHeight;
};

function showErr() {
    positionNum ++;
    document.getElementById("demo").innerHTML += "序號：" + positionNum;
    document.getElementById("demo").appendChild(document.createElement('p')).innerHTML = "定位失敗！";
    document.getElementById("pos-area").scrollTop = document.getElementById("pos-area").scrollHeight;
};

function showWatchPosition() {
    document.getElementById("demo").innerHTML += "開始監聽位置！<br /><br />";
    geolocation.watchPosition(showPosition);
    document.getElementById("pos-area").scrollTop = document.getElementById("pos-area").scrollHeight;
};

function showClearWatch() {
    geolocation.clearWatch();
    document.getElementById("demo").innerHTML += "停止監聽位置！<br /><br />";
    document.getElementById("pos-area").scrollTop = document.getElementById("pos-area").scrollHeight;
};
geolocation.getLocation(showPosition, showErr, options);

轉自騰訊地圖，好用！