利用HTML5定位功能，實如今百度地圖上定位（轉）

時間 2021-08-14

標籤 javascript css html java jquery git api 瀏覽器微信 app 欄目 HTML5 简体版

原文原文鏈接

代碼以下：javascript

測試瀏覽器：ie11定位成功率100%，Safari定位成功率97%，（add by zhj :在手機上測試（用微信內置瀏覽器打開），不管使用WIFI仍是移動4G聯網，css

定位精度都是蠻高的，偏差在幾十米內）html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>HTML5定位</title>
    <script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.7.2/jquery.min.js"></script>
  <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=wqBXfIN3HkpM1AHKWujjCdsi"></script>
  <script type="text/javascript" src="http://developer.baidu.com/map/jsdemo/demo/convertor.js"></script>
    <style type="text/css">
    *{ margin: 0px; padding: 0px;}
  body{text-align: center;  height: 100%;overflow:hidden;}
  #allmap{ width: 100%;height: 100%; position: absolute;}
    </style>
</head>
<body>
    <div id="allmap"></div>
<script type="text/javascript">
 $(function(){
     if(supportsGeoLocation()){
         alert("你的瀏覽器支持 GeoLocation.");
     }else{
         alert("不支持 GeoLocation.")
     }
  // 檢測瀏覽器是否支持HTML5
               function supportsGeoLocation(){
                  return !!navigator.geolocation;
              }  
  // 單次位置請求執行的函數             
               function getLocation(){
                  navigator.geolocation.getCurrentPosition(mapIt,locationError);
               }
  //定位成功時，執行的函數
              function mapIt(position){ 
                var lon = position.coords.longitude;
                   var lat = position.coords.latitude;
                   // alert("您位置的經度是："+lon+" 緯度是："+lat);
                var map = new BMap.Map("allmap");
                var point = new BMap.Point(""+lon+"",""+lat+"");
                map.centerAndZoom(point,19);
                var gc = new BMap.Geocoder();
                translateCallback = function (point){
                    var marker = new BMap.Marker(point);
                    map.addOverlay(marker);
                    map.setCenter(point);
                    gc.getLocation(point, function(rs){
                        var addComp = rs.addressComponents;
                        if(addComp.province!==addComp.city){
                            var sContent =
                                "<div><h4 style='margin:0 0 5px 0;padding:0.2em 0'>你當前的位置是：</h4>" + 
                                "<p style='margin:0;line-height:1.5;font-size:13px;text-indent:2em'>"+addComp.province + ", " + addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber+"</p>" + 
                                "</div>";                        }
                        else{
                            var sContent =
                                "<div><h4 style='margin:0 0 5px 0;padding:0.2em 0'>你當前的位置是：</h4>" + 
                                "<p style='margin:0;line-height:1.5;font-size:13px;text-indent:2em'>"+ addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber+"</p>" + 
                                "</div>";
                        }
                        var infoWindow = new BMap.InfoWindow(sContent);
                        map.openInfoWindow(infoWindow,point);
                    }); 
                }//gpsPoint：轉換前座標，第二個參數爲轉換方法，0表示gps座標轉換成百度座標，callback回調函數，參數爲新座標點                  
                BMap.Convertor.translate(point,0,translateCallback); 
            }
  // 定位失敗時，執行的函數
               function locationError(error)
              {
              switch(error.code)
                {
                case error.PERMISSION_DENIED:
                  alert("User denied the request for Geolocation.");
                  break;
                case error.POSITION_UNAVAILABLE:
                   alert("Location information is unavailable.");
                  break;
                case error.TIMEOUT:
                   alert("The request to get user location timed out.");
                  break;
                case error.UNKNOWN_ERROR:
                   alert("An unknown error occurred.");
                  break;
                }
              }
  // 頁面加載時執行getLocation函數
  window.onload = getLocation;  
        })
</script>
</body>
</html>