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The person above is right, use promise

get:function(){
    return new Promise(function(resolve,reject){
        //ajax...
        $.post("test.php",function(response){
            resolve(response)
        })
        //如果有錯的話就reject
    })
}

Use

get().then(function(response){
    //response
}).catch(function(err){
    //錯誤處理
})

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);
})

Make it a Promise

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