在localStorage和我的地理位置中获取离JSON最近的位置

// 获取地理位置
navigator.geolocation.getCurrentPosition(function(position) {
  var latitude = position.coords.latitude; // 纬度
  var longitude = position.coords.longitude; // 经度

  // 解析JSON数据
  var jsonData = '{"locations": [{"name": "位置1", "latitude": 40.7128, "longitude": -74.0060}, {"name": "位置2", "latitude": 34.0522, "longitude": -118.2437}]}';
  var data = JSON.parse(jsonData);
  var locations = data.locations;

  // 计算最近的位置
  var minDistance = Number.MAX_VALUE;
  var nearestLocation = null;
  for (var i = 0; i < locations.length; i++) {
    var location = locations[i];
    var distance = calculateDistance(latitude, longitude, location.latitude, location.longitude);
    if (distance < minDistance) {
      minDistance = distance;
      nearestLocation = location;
    }
  }

  // 存储最近的位置到localStorage
  localStorage.setItem('nearestLocation', JSON.stringify(nearestLocation));
});

// 计算两个位置之间的距离
function calculateDistance(lat1, lon1, lat2, lon2) {
  var R = 6371; // 地球半径，单位为千米
  var dLat = (lat2 - lat1) * Math.PI / 180;
  var dLon = (lon2 - lon1) * Math.PI / 180;
  var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
          Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
          Math.sin(dLon / 2) * Math.sin(dLon / 2);
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
  var distance = R * c;
  return distance;
}