Html5 Geolocation demo

时间：2023-03-09 20:19:34
Html5 Geolocation demo 
<!DOCTYPE html>

<head>

    <meta charset="utf-8">

    <title>HTML5 Geolocation距离跟踪器</title>

</head>

<body onload="loadDemo()">

<h1>HTML5 Geolocation距离跟踪器</h1>

<p id="status">该浏览器不支持HTML5 Geolocation。</p>

<h2>当前位置：</h2>

<table border="1">

<tr>

<td width="40" scope="col">纬度</th>

<td width="114" id="latitude">?</td>

</tr>

<tr>

<td>经度</td>

<td id="longitude">?</td>

</tr>

<tr>

<td>准确度</td>

<td id="accuracy">?</td>

</tr>

</table>

<h4 id="currDist">本次移动距离：0 千米</h4>

<h4 id="totalDist">总计移动距离：0 千米</h4>

<script type="text/javascript">

    var totalDistance = 0.0;

    var lastLat;

    var lastLong;

    function toRadians(degree) {

      return this * Math.PI / 180;

    }

    function distance(latitude1, longitude1, latitude2, longitude2) {

      // R是地球半径（KM）

      var R = 6371;

      var deltaLatitude = toRadians(latitude2-latitude1);

      var deltaLongitude = toRadians(longitude2-longitude1);

      latitude1 = toRadians(latitude1);

      latitude2 = toRadians(latitude2);

      var a = Math.sin(deltaLatitude/2) *

              Math.sin(deltaLatitude/2) +

              Math.cos(latitude1) *

              Math.cos(latitude2) *

              Math.sin(deltaLongitude/2) *

              Math.sin(deltaLongitude/2);

      var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));

      var d = R * c;

      return d;

    }

    function updateStatus(message) {

        document.getElementById("status").innerHTML = message;

    }

    function loadDemo() {

        if(navigator.geolocation) {

            updateStatus("浏览器支持HTML5 Geolocation。");

            navigator.geolocation.watchPosition(updateLocation, handleLocationError, {maximumAge:20000});

        }

    }

    function updateLocation(position) {

        var latitude = position.coords.latitude;

        var longitude = position.coords.longitude;

        var accuracy = position.coords.accuracy;

        document.getElementById("latitude").innerHTML = latitude;

        document.getElementById("longitude").innerHTML = longitude;

        document.getElementById("accuracy").innerHTML = accuracy;

        // 如果accuracy的值太大，我们认为它不准确，不用它计算距离

        if (accuracy >= 500) {

            updateStatus("这个数据太不靠谱，需要更准确的数据来计算本次移动距离。");

            return;

        }

        // 计算移动距离

        if ((lastLat != null) && (lastLong != null)) {

            var currentDistance = distance(latitude, longitude, lastLat, lastLong);

            document.getElementById("currDist").innerHTML =

              "本次移动距离：" + currentDistance.toFixed(4) + " 千米";

            totalDistance += currentDistance;

            document.getElementById("totalDist").innerHTML =

              "总计移动距离：" + currentDistance.toFixed(4) + " 千米";

        }

        lastLat = latitude;

        lastLong = longitude;

        updateStatus("计算移动距离成功。");

    }

    function handleLocationError(error) {

        switch(error.code)

        {

        case 0:

          updateStatus("尝试获取您的位置信息时发生错误：" + error.message);

          break;

        case 1:

          updateStatus("用户拒绝了获取位置信息请求。");

          break;

        case 2:

          updateStatus("浏览器无法获取您的位置信息：" + error.message);

          break;

        case 3:

          updateStatus("获取您位置信息超时。");

          break;

        }

    }

</script>

</body>

</html>
<!DOCTYPE html>

<html>

  <head>

    <style>

      #tripmeter {

        border: 3px double black;

        padding: 10px;

        margin: 10px 0;

      }

      p {

        color: #222;

        font: 14px Arial;

      }

      span {

        color: #00C;

      }

    </style>

  </head>

  <body>

    <div id="tripmeter">

      <p>

        Starting Location (lat, lon):<br/>

        <span id="startLat">???</span>&deg;, <span id="startLon">???</span>&deg;

      </p>

      <p>

        Current Location (lat, lon):<br/>

        <span id="currentLat">???</span>&deg;, <span id="currentLon">???</span>&deg;

      </p>

      <p>

        Distance from starting location:<br/>

        <span id="distance">0</span> km

      </p>

    </div>

    <script>

      window.onload = function() {

        var startPos;

        if (navigator.geolocation) {

          navigator.geolocation.getCurrentPosition(function(position) {

            startPos = position;

            document.getElementById("startLat").innerHTML = startPos.coords.latitude;

            document.getElementById("startLon").innerHTML = startPos.coords.longitude;

          }, function(error) {

            alert("Error occurred. Error code: " + error.code);

            // error.code can be:

            //   0: unknown error

            //   1: permission denied

            //   2: position unavailable (error response from locaton provider)

            //   3: timed out

          });

          navigator.geolocation.watchPosition(function(position) {

            document.getElementById("currentLat").innerHTML = position.coords.latitude;

            document.getElementById("currentLon").innerHTML = position.coords.longitude;

            document.getElementById("distance").innerHTML =

              calculateDistance(startPos.coords.latitude, startPos.coords.longitude,

                                position.coords.latitude, position.coords.longitude);

          });

        }

      };

      // Reused code - copyright Moveable Type Scripts - retrieved May 4, 2010.

      // http://www.movable-type.co.uk/scripts/latlong.html

      // Under Creative Commons License http://creativecommons.org/licenses/by/3.0/

      function calculateDistance(lat1, lon1, lat2, lon2) {

        var R = 6371; // km

        var dLat = (lat2-lat1).toRad();

        var dLon = (lon2-lon1).toRad();

        var a = Math.sin(dLat/2) * Math.sin(dLat/2) +

                Math.cos(lat1.toRad()) * Math.cos(lat2.toRad()) *

                Math.sin(dLon/2) * Math.sin(dLon/2);

        var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));

        var d = R * c;

        return d;

      }

      Number.prototype.toRad = function() {

        return this * Math.PI / 180;

      }

    </script>

  </body>

</html>​

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