Javascript 如何从地理定位方法中提取坐标
嗨,我是java脚本新手。请帮我从上述方法中找出协调。警报未定义。您应该定义Javascript 如何从地理定位方法中提取坐标,javascript,Javascript,嗨,我是java脚本新手。请帮我从上述方法中找出协调。警报未定义。您应该定义OnSuccess函数,并获取纬度和经度 var alt, lat, long; function onSuccess(position) { lat = position.coords.latitude; long = position.coords.longitude; alt = position.coords
OnSuccess
函数,并获取纬度
和经度
var alt, lat, long;
function onSuccess(position) {
lat = position.coords.latitude;
long = position.coords.longitude;
alt = position.coords.altitude;
}
function onError(error) {
myApp.alert('code: ' + error.code + '\n' + 'message: ' + error.message + '\n', main_title);
}
navigator.geolocation.getCurrentPosition(onSuccess, onError, { enableHighAccuracy: true });
alert(long + ' ' + lat);
问题在于警报的位置。警报需要进入onSuccess回调方法。下面是JavaScript如何解释代码
function onSuccess(pos) {
var crd = pos.coords;
console.log('Your current position is:');
console.log(`Latitude : ${crd.latitude}`);
console.log(`Longitude: ${crd.longitude}`);
}
navigator.geolocation.getCurrentPosition(onSuccess, onError, { enableHighAccuracy: true });
嗨,我只想让alt、long和lat变量成为全局变量。alt、long和lat已经是全局变量了。在异步地理定位代码完成之前,它们都是未定义的。当onSuccess或onError被调用时,我们知道它已完成。因此,这也是执行警报的最佳时机。
var alt, lat, long;
function onSuccess(position) {
lat = position.coords.latitude;
long = position.coords.longitude;
alt = position.coords.altitude;
allert(long + ', ' + lat);
}
function onError(error) {
myApp.alert('code: ' + error.code + '\n' + 'message: ' + error.message + '\n', main_title);
}
navigator.geolocation.getCurrentPosition(onSuccess, onError, { enableHighAccuracy: true });