Ajax 调用不等待服务器响应

我在Windows10机器上使用WAMP v.2.5。我的项目是一个运行在MySQL数据库上的PHP项目。它包括许多 AJAX 调用，这些调用工作正常。但是，我有一个特定的呼叫，它给了我一个"意外的输入结束"错误。

调用是从视图发出的，被定向到全局 ajax 处理程序 PHP 脚本，该脚本将请求转发给控制器，然后控制器向模型请求响应。正在触发相应的模型方法。该方法包含错误检查，并将为空结果引发异常。中的数据库查询有效，并在控制台中使用时返回结果。但是，10 次中有 9 次，ajax fn 将在没有接收/读取查询结果的情况下完成，从而生成上述错误。有时它会正常工作。

当放置在实时服务器上时，一切都可以正常工作。这几乎就像脚本在本地计算机上运行得太快，无法等待数据库响应或引发任何异常。

谁能告诉我如何正确测试正在发生的事情，或者解决上述问题？

编辑：
受影响代码的跟踪：

$(document).ready(function()
{
    //some code
    updateFilteredScheduleList();
    //some code
});
function updateFilteredScheduleList()
{
    var opts = $.extend(true, {}, dialogOptions);
    getFilteredScheduleResults()
        .done(function(returnedData)
        {
            var returnedDataObj = parseAjaxJSONResponse(returnedData);
            if(returnedDataObj.hasOwnProperty('success'))
                buildScheduleList(returnedDataObj.response);
        })
        .error(function(xhr, options, error)
        {
            opts.message = error;
            displayDialog(opts);
            return false;
        });
}
function getFilteredScheduleResults()
{
    var values = getFilterValues();
    values.controller = 'WSVisits';
    values.method = 'getFilteredScheduleResults';
    console.log(values);
    return $.ajax({
        type: 'post',
        cache: false,
        data: values,
        url: controllersAjaxPath
    });
}
function getFilterValues()
{
    var values = {};
    //get values of view filters
    return values;
}
function parseAjaxJSONResponse(data)
{
    var opts = $.extend(true, {}, dialogOptions);
    try
    {
        var tmp = JSON.parse(data);
        if(tmp.hasOwnProperty('error'))
        {
            opts.message = tmp.error;
            displayDialog(opts);
            return false;
        }
        return tmp;
    }
    catch(e)
    {
        opts.message = e.message;
        displayDialog(opts);
        return false;
    }
}

PHP方法(略有编辑(：

function getFilteredScheduleResults($args = null)
{
    $id = intval($args['MyID']);
    $region_id = (!$id) ? ( intval($args['RegionID']) > 0) ? intval($args['RegionID']) : 0 : 0;
    $county_id = (!$id) ? ( intval($args['CountyID']) > 0) ? intval($args['CountyID']) : 0 : 0;
    $language_id = (!$id) ? ( intval($args['LanguageID']) > 0) ? intval($args['LanguageID']) : 0 : 0;
    $center_id = (!$id) ? ( intval($args['CenterID']) > 0) ? intval($args['CenterID']) : 0 : 0;
    $type_id = (!$id) ? ( intval($args['TypeID']) > 0) ? intval($args['TypeID']) : 0 : 0;
    $support_type_id = (!$id) ? ( intval($args['SupportTypeID']) > 0) ? intval($args['SupportTypeID']) : 0 : 0;
    $address_token = (!$id) ? ( trim($args['AddressContains']) !== '') ? trim($args['AddressContains']) : null : null;
    $purpose_id = (intval($args['PurposeID']) > 0) ? intval($args['PurposeID']) : 0;
    $associate_id = (intval($args['AssociateID']) > 0) ? intval($args['AssociateID']) : 0;
    if(!empty($args['From']))
    {
        $from_obj = DateTime::createFromFormat('d/m/Y', $args['From']);
        $args['From'] = (!$from_obj) ? null : $from_obj->format('Y-m-d');
    }
    if(!empty($args['To']))
    {
        $to_obj = DateTime::createFromFormat('d/m/Y', $args['To']);
        $args['To'] = (!$to_obj) ? null : $to_obj->format('Y-m-d');
    }

    $sql = " /*query*/ WHERE 1 ";
    if($id)
        $sql.= " AND ( s.MyID = :MyID ) ";
    else
    {
        if($region_id)
            $sql.= " AND ( RegionID = :RegionID ) ";
        if($county_id)
            $sql.= " AND ( CountyID = :CountyID ) ";
        if($language_id)
            $sql.= " AND ( LanguageID = :LanguageID ) ";
        if($center_id)
            $sql.= " AND ( CenterID = :CenterID ) ";
        if($type_id)
            $sql.= " AND ( s.TypeID = :TypeID ) ";
        if($support_type_id)
            $sql.= " AND ( SupportTypeID = :SupportTypeID ) ";";
        if(!is_null($address_token))
            $sql.= " AND ( UPPER(CONCAT_WS(' ', Add1, Add2, Add3, CityTown)) LIKE UPPER(:AddressToken) ) ";
    }
    $sql.= " GROUP BY s.MyID ORDER BY MyName ASC ";
    $db = new Database();
    try
    {
        $db->query($sql);
        if($id)
            $db->bind(':MyID', $id);
        else
        {
            if($region_id)
                $db->bind(':RegionID', $region_id);
            if($county_id)
                $db->bind(':CountyID', $county_id);
            if($language_id)
                $db->bind(':LanguageID', $language_id);
            if($center_id)
                $db->bind(':CenterID', $center_id);
            if($type_id)
                $db->bind(':TypeID', $type_id);
            if($support_type_id)
                $db->bind(':SupportTypeID', $support_type_id);
            if(!is_null($address_token))
                $db->bind(':AddressToken', '%' . $address_token . '%');
        }
        $db->execute();
        $tmp = $db->fetchAllAssoc();
        $get_assignments_only = (!empty($args['AssignmentsOnly']));
        $returned = [];
        $sql = " SELECT VisitID FROM visits_ws WHERE MyID = :MyID ";
        if($purpose_id)
            $sql.= " AND ( VisitPurposeID = :Purpose ) ";
        if($associate_id)
            $sql.= " AND ( ( Associate1ID = :AssociateID ) OR ( Associate2ID = :AssociateID ) OR ( Associate3ID = :AssociateID ) OR ( Associate4ID = :AssociateID ) ) ";
        if(!empty($args['From']))
            $sql.= " AND ( VisitDate >= :From ) ";
        if(!empty($args['To']))
            $sql.= " AND ( VisitDate <= :To ) ";
        $db->query($sql);
        foreach($tmp as $i => $t)
        {
            $db->bind(':MyID', $t['MyID']);
            if($purpose_id)
                $db->bind(':Purpose', $purpose_id);
            if($associate_id)
                $db->bind(':AssociateID', $associate_id);
            if(!empty($args['From']))
                $db->bind(':From', $args['From']);
            if(!empty($args['To']))
                $db->bind(':To', $args['To']);
            $db->execute();
            $visits = $db->fetchAllAssoc();
            if( ($get_assignments_only) && (empty($visits)) )
                continue;
            if( ( ($purpose_id) || ($associate_id) || (!empty($args['From'])) || (!empty($args['To'])) ) && (empty($visits)) )
                continue;
            $tmp[$i]['HasVisits'] = (empty($visits)) ? 0 : 1;
            $tmp = $schools[$i];
            unset($tmp['Name']);
            $schools[$i]['Address'] = build_address($tmp);
            unset($schools[$i]['Add1']);
            unset($schools[$i]['Add2']);
            unset($schools[$i]['Add3']);
            unset($schools[$i]['CityTown']);
            unset($schools[$i]['CityPostCode']);
            unset($schools[$i]['Name']);
            unset($schools[$i]['LanguageID']);
            unset($schools[$i]['PrincipalID']);
            unset($schools[$i]['ContactID']);
            unset($schools[$i]['TypeID']);
            unset($schools[$i]['CenterID']);
            unset($schools[$i]['SupportTypeID']);
            unset($schools[$i]['CountyID']);
            unset($schools[$i]['AreaCodeID']);
            unset($schools[$i]['NetworkCodeID']);
            unset($schools[$i]['RegionID']);
            $returned[] = $tmp[$i];
        }
        return ['jct_success'=>'ok', 'response'=>$returned];
    }
    catch(PDOException $e)
    {
        return ['jct_error'=>$e->getMessage()];
    }
}