javascript - How to return data obtained asynchronously

Question

As shown in the figure, the data is obtained asynchronously using ajax. How to return the data to the previous layer. . . As shown in the figure, how can we make the second return value asynchronously obtain the returned data

Answer 1

The person above is right, use promise

get:function(){
    return new Promise(function(resolve,reject){
        //ajax...
        $.post("test.php",function(response){
            resolve(response)
        })
        //如果有错的话就reject
    })
}

Use

get().then(function(response){
    //response
}).catch(function(err){
    //错误处理
})

Answer 2

Either change it to synchronous or use callback, your return is useless

get:function(callback){
    $.post(.....,function(res){
        callback(res)
    })
}

get(function(res){
    console.log(res);
})

Answer 3

Make it a Promise

return Promise.resolve($.post(url,data));