我试图选择多个图像，然后将ID（逗号分隔）插入文本字段。

这是我的代码，但它只选择第一个图像ID：

jQuery(document).ready(function($){
var custom_uploader;
$(\'#media-button\').click(function(e) {
    e.preventDefault();
    //If the uploader object has already been created, reopen the dialog
    if (custom_uploader) {
        custom_uploader.open();
        return;
    }
    //Extend the wp.media object
    custom_uploader = wp.media.frames.file_frame = wp.media({
        title: \'Choose Image\',
        button: {
            text: \'Choose Image\'
        },
        multiple: true
    });
    custom_uploader.on(\'select\', function() {
        var selection = custom_uploader.state().get(\'selection\');
        selection.map( function( attachment ) {
        $("#media-input").val(attachment.id);
        });
    });
    custom_uploader.open();
});
});