在主题函数中。php文件：

/**
 * Add svg MIME type support
 *
 * @param $mimes
 *
 * @author fadupla
 * @return mixed
 */
function fadupla_mime_types( $mimes ) {
    $mimes[\'svg\'] = \'image/svg+xml\';

    return $mimes;
}

add_filter( \'upload_mimes\', \'fadupla_mime_types\' );

/**
 * Enqueue SVG javascript and stylesheet in admin
 * @author fadupla
 */

function fadupla_svg_enqueue_scripts( $hook ) {
    wp_enqueue_style( \'fadupla-svg-style\', get_theme_file_uri( \'/assets/css/svg.css\' ) );
    wp_enqueue_script( \'fadupla-svg-script\', get_theme_file_uri( \'/assets/js/svg.js\' ), \'jquery\' );
    wp_localize_script( \'fadupla-svg-script\', \'script_vars\',
        array( \'AJAXurl\' => admin_url( \'admin-ajax.php\' ) ) );
}

add_action( \'admin_enqueue_scripts\', \'fadupla_svg_enqueue_scripts\' );


/**
 * Ajax get_attachment_url_media_library
 * @author fadupla
 */
function fadupla_get_attachment_url_media_library() {

    $url          = \'\';
    $attachmentID = isset( $_REQUEST[\'attachmentID\'] ) ? $_REQUEST[\'attachmentID\'] : \'\';
    if ( $attachmentID ) {
        $url = wp_get_attachment_url( $attachmentID );
    }

    echo $url;

    die();
}

add_action( \'wp_ajax_svg_get_attachment_url\', \'fadupla_get_attachment_url_media_library\' );

var mediaGridObserver = new MutationObserver(function (mutations) {

    for (var i = 0; i < mutations.length; i++)
    {

        for (var j = 0; j < mutations[i].addedNodes.length; j++)
        {
            element = $(mutations[i].addedNodes[j]);

            if (element.attr(\'class\'))
            {
                elementClass = element.attr(\'class\');
                if (element.attr(\'class\').indexOf(\'attachment\') != -1)
                {

                    attachmentPreview = element.children(\'.attachment-preview\');
                    if (attachmentPreview.length != 0)
                    {
                        if (attachmentPreview.attr(\'class\').indexOf(\'subtype-svg+xml\') != -1)
                        {
                            var handler = function (element) {

                                jQuery.ajax({

                                    url: script_vars.AJAXurl,
                                    type: "POST",
                                    dataType: \'html\',
                                    data: {
                                        \'action\': \'svg_get_attachment_url\',
                                        \'attachmentID\': element.attr(\'data-id\')
                                    },
                                    success: function (data) {
                                        if (data)
                                        {
                                            element.find(\'img\').attr(\'src\', data);
                                            element.find(\'.filename\').text(\'SVG Image\');
                                        }
                                    }
                                });

                            }(element);

                        }
                    }
                }
            }
        }
    }
});

var attachmentPreviewObserver = new MutationObserver(function (mutations) {
    for (var i = 0; i < mutations.length; i++)
    {
        for (var j = 0; j < mutations[i].addedNodes.length; j++)
        {
            var element = $(mutations[i].addedNodes[j]);
            var onAttachmentPage = false;
            if ((element.hasClass(\'attachment-details\')) || element.find(\'.attachment-details\').length != 0)
            {
                onAttachmentPage = true;
            }

            if (onAttachmentPage == true)
            {
                var urlLabel = element.find(\'label[data-setting="url"]\');
                if (urlLabel.length != 0)
                {
                    var value = urlLabel.find(\'input\').val();
                    element.find(\'.details-image\').attr(\'src\', value);
                }
            }
        }
    }
});

$(document).ready(function () {

    mediaGridObserver.observe(document.body, {
        childList: true,
        subtree: true
    });

    attachmentPreviewObserver.observe(document.body, {
        childList: true,
        subtree: true
    });


});

img[src*=\'.svg\'] {
    width: 100%;
    height: auto;
}