获取位置并分配给全局变量

// 定义全局变量
let userLocation = null;

// 获取地理位置
function getLocation() {
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(showPosition, showError);
  } else {
    console.log("Geolocation is not supported by this browser.");
  }
}

// 成功获取位置
function showPosition(position) {
  userLocation = {
    latitude: position.coords.latitude,
    longitude: position.coords.longitude
  };
  console.log("Latitude: " + userLocation.latitude + 
  " Longitude: " + userLocation.longitude);
}

// 获取位置失败
function showError(error) {
  switch(error.code) {
    case error.PERMISSION_DENIED:
      console.log("User denied the request for Geolocation.");
      break;
    case error.POSITION_UNAVAILABLE:
      console.log("Location information is unavailable.");
      break;
    case error.TIMEOUT:
      console.log("The request to get user location timed out.");
      break;
    case error.UNKNOWN_ERROR:
      console.log("An unknown error occurred.");
      break;
  }
}

// 调用获取位置函数
getLocation();