使用jQuery加载媒体管理器
这是我找到的一个示例JS文件。我希望这有帮助。

(function($) {

$(document).ready( function() {
    var file_frame; // variable for the wp.media file_frame

    // attach a click event (or whatever you want) to some element on your page
    $( \'#frontend-button\' ).on( \'click\', function( event ) {
        event.preventDefault();

        // if the file_frame has already been created, just reuse it
        if ( file_frame ) {
            file_frame.open();
            return;
        } 

        file_frame = wp.media.frames.file_frame = wp.media({
            title: $( this ).data( \'uploader_title\' ),
            button: {
                text: $( this ).data( \'uploader_button_text\' ),
            },
            multiple: false // set this to true for multiple file selection
        });

        file_frame.on( \'select\', function() {
            attachment = file_frame.state().get(\'selection\').first().toJSON();

            // do something with the file here
            $( \'#frontend-button\' ).hide();
            $( \'#frontend-image\' ).attr(\'src\', attachment.url);
        });

        file_frame.open();
    });
});

})(jQuery);