我在自己的研究中发现了这个问题,并最终开发了一个更丰富的解决方案,我认为这可能是有价值的。
如果您想知道用户选择的媒体大小的url,那么以下代码(下面是完整的jQuery代码)将为您提供:
jQuery(function($) {
    // Bind to my upload butto
    $(document).on(\'click\', \'a.custom-media-upload\', function() {
        customUpload($(this));
        return false;
    });
    function customUpload(el) {
        formfield = $(el);
        custom_media = true;
        var _orig_send_attachment = wp.media.editor.send.attachment;
        wp.media.editor.send.attachment = function(props, attachment) {
            if ( custom_media ) {
                formfield = renderUpload(formfield, attachment, props);
            } else {
                return _orig_send_attachment.apply( this, [props, attachment] );
            }
        }
        wp.media.editor.open(1);
    }
    function renderUpload(field, attachment, props) {
        // This gets the full-sized image url
        var src = attachment.url;
        // Get the size selected by the user
        var size = props.size;
        // Or, if you\'d rather, you can set the size you want to get:
        // var size = \'thumbnail\'; // or \'full\' or \'medium\' or \'large\'...
        // If the media supports the selected size, get it
        if (attachment.sizes[size]) {
            src = attachment.sizes[size].url;
        }
        // Do what you want with src here....
    }
});