// 判断浏览器是否支持定位;

if( navigator.geolocation ){

​

  var watchId = null;

​

  var oBox = document.getElementById('box'),

      aDivs = oBox.getElementsByTagName('div');

​

  /**

      Geolocation分两种：‘单次定位请求’、‘重复定位请求’：

             * 重复更新位置请求(不允许指定多长时间请求一次) 第一个参数(watchMap)执行的函数,第二个参数(handleError) 错误执行函数,第三个参数JSON:

             *  {

             *      enableHighAccuracy : 高精度模式 (true/false),谨慎使用;

             *      timeout            : 允许最长时间计算，就会调用错误处理函数(ms);

             *      maximumAge         : 从新计算位置的时间间隔(ms);

             *  }

            */

  watchId = navigator.geolocation.watchPosition(watchMap, handleError, {enableHighAccuracy:true,timeout:5000, maximumAge: 5000 });

​

  //一次更新位置请求

  //watchId = navigator.geolocation.getCurrentPosition(onceMap, handleError, {enableHighAccuracy:true,timeout:5000, maximumAge: 5000 });

​

  //重复请求的函数;

  function watchMap( position ){

    var latitude = position.coords.latitude;  //纬度;

    var longitude = position.coords.longitude; //经度;

    var accuracy = position.coords.accuracy; //准确度;

    var timestamp = position.timestamp;  //时间戳;

    //如果浏览器支持否则只会返回null/undefined:

    var altitude = position.altitude;  //海拔高度(m);

    var altitudeAccuracy = position.altitudeAccuracy;  //海拔高度精确度(m);

    var heading = position.heading;  //行进的方向(相对正北方向);

    var speed = position.speed;  //地面速度(m/s);

​

    //判断准确度小于3000;

    if( accuracy <= 3000 ){

​

      aDivs[0].innerHTML = latitude;

      aDivs[1].innerHTML = longitude;

      aDivs[2].innerHTML = accuracy;

      aDivs[3].innerHTML = timestamp;

      aDivs[4].innerHTML = altitude;

      aDivs[5].innerHTML = altitudeAccuracy;

      aDivs[6].innerHTML = heading;

      aDivs[7].innerHTML = speed;

​

      navigator.geolocation.clearWatch(watchId);  //停止重复求情;

​

    }

​

  }

​

  //一次请求的函数;

  function onceMap( position ) {  

​

    var latitude = position.coords.latitude;  //纬度;

    var longitude = position.coords.longitude; //经度;

    var accuracy = position.coords.accuracy; //准确度;

    var timestamp = position.timestamp;  //时间戳;

    //如果浏览器支持否则只会返回null:

    var altitude = position.altitude;  //海拔高度(m);

    var altitudeAccuracy = position.altitudeAccuracy;  //海拔高度精确度(m);

    var heading = position.heading;  //行进的方向(相对正北方向);

    var speed = position.speed;  //地面速度(m/s);

​

    //判断准确度小于3000;

    if( accuracy <= 3000 ){

​

      aDivs[0].innerHTML = latitude;

      aDivs[1].innerHTML = longitude;

      aDivs[2].innerHTML = accuracy;

      aDivs[3].innerHTML = timestamp;

      aDivs[4].innerHTML = altitude;

      aDivs[5].innerHTML = altitudeAccuracy;

      aDivs[6].innerHTML = heading;

      aDivs[7].innerHTML = speed;

​

    }

​

  }

​

  //错误处理;

  function handleError( error ){

​

    switch (error.code) {  //错误编号;

      case 1:    

        aDivs[8].innerHTML = '位置服务被拒绝';

        break;  

      case 2:  

        aDivs[8].innerHTML = '暂时获取不到位置信息';

        break;  

      case 3:  

        aDivs[8].innerHTML = '获取信息超时';

        break;  

      default:  

        aDivs[8].innerHTML = '未知错误';

        break;  

    }  

​

  }

}