如何返回从ip2db.php返回的值？

Question

当我用控制台调用console.log(ip2db())时，它会输出“undefined”。如何返回从ip2db.php返回的值？

这是我的代码：

function ip2db(){
    var result;
    $.getJSON('https://api.ipgeolocation.io/ipgeo?apiKey=a759dab4af1f462496dda90b3575f7c7', function(data) { 
        var ip_data = JSON.stringify(data, null, 2);
        $.post("https://mywebsite.com/ip2db.php",
            {
                ip_data
            },
            function(data, status){
                console.log("data: " + data + "
Status: " + status);
                CreateUserStorage(data);
                result = data;
            }
        );   
    });
    return result;
}

Answer 1

ajax call are synchronic calls so you will never get a response. There two options: - passing a callback - use promises

• there is await - async but off-topic for this question

So in this example you posted, you should do:

function ip2db(your_callback){
    var result;
    $.getJSON('https://api.ipgeolocation.io/ipgeo?apiKey=a759dab4af1f462496dda90b3575f7c7', function(data) { 
        var ip_data = JSON.stringify(data, null, 2);
        $.post("https://mywebsite.com/ip2db.php",
            {
                ip_data
            },
            function(data, status){
                console.log("data: " + data + "
Status: " + status);
                CreateUserStorage(data);
                result = data;
                your_callback(result)
            }
        );   
    });
}

you call it like this:

ip2db(function(result) {
    console.log(result);
})