Return a value

I use function.

HTML Code:

function getUnical(id, type) {
    //var data = {};    
    var res =  false;
    Ext.Ajax.request({
        url: 'inc/ajax/staff_edit.php?v='+type,
        method: 'POST',
        params: {
            id: id
        },
        success: function(response){
            //console.log(response);    
            var obj = Ext.decode(response.responseText);
            //console.log(obj);                                                            
            if (obj.success == 'error')
            {                    
                var staff = obj.staff; 
                Ext.getCmp(type).focus();
                //console.log(staff);    
                res = staff;
            }            
        }
    });    
    
    return res;        
}

After the query it must return a value. But for some reason always returns false.Why? How to return the "staff" value?



Return a value