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传单检测标记何时进入和退出圆圈

我正在尝试使用传单进行地理围栏，并且我有一个可以移动的标记和一个在地图上的圆圈。

这是完整的代码：

<!DOCTYPE html>
<html lang="en" >
<head>
  <meta charset="UTF-8">
  <title></title>

</head>
<body>

<head>
    <link href='https://api.mapbox.com/mapbox.js/plugins/leaflet-locatecontrol/v0.43.0/css/font-awesome.min.css' rel='stylesheet' />
    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css" />

    <script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js"></script>
  </head>
<body>
<div id="mapid" style="height: 600px"></div>
<script>

  var mymap = L.map('mapid', {
    center: [50.897819, -1.150189],
    zoom: 16
  });

    L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1Ijoic3RldmVuc2F0Y2giLCJhIjoiY2p5eDR6MWgzMHRvbjNocnJkN2d2MjRwaSJ9.wd0OtBUQQfUtNxdduQA3lg', {
        maxZoom: 18,
        attribution: 'Map data &copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, ' +
            '<a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
            'Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
        id: 'mapbox.streets'
    }).addTo(mymap);

var marker = new L.marker([50.898422, -1.148444],{
    draggable: true,
    autoPan: true
}).addTo(mymap);


 var circle = …

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javascript maps geofencing leaflet

bri*_*005

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