问通过ajax将PHP对象返回给javascript

EN

var asset;
$.ajax({
        type: "POST",
        url: "internal_api/uploadasset.php",
        cache: false,
        processData: false,
        contentType: false,
        data: form_data,
        success: function(data){
            rowid = data.rowid;
            asset = data.videoasset;
            console.log(asset);
            alert("Video successfully uploaded");
        },
        error: function() {
            alert("Error");
        },
        dataType: 'json',
    });

<?php
    require_once '../vendor/autoload.php';
    include './config.php';
    include_once 'azureconfig.inc';
    use WindowsAzure\Common\ServicesBuilder;
    use WindowsAzure\Common\Internal\MediaServicesSettings;
    use WindowsAzure\Common\Internal\Utilities;
    use WindowsAzure\MediaServices\Models\Asset;

    /*
       all azure code comes here
    */
    $videoAsset = uploadFileAndCreateAsset($restProxy,$video_file,$video_name);
    $query = mysql_query("insert into tbl_videos (filename,userid,clipid,type).....")
    $rowid = mysql_insert_id();
    $return['rowid'] = $rowid;
    $return['videoasset'] = $videoAsset;

    echo json_encode($return);
?>