```#progress {background: white; height: 20px; padding: 2px; border: 1px solid green; margin: 2px;}
if (progress) {
$("#" + progress_node_id + " > span").css("width", String(progress) + "%");
$("#" + progress_node_id + " > span").html(String(progress) + "%");
}
上面这段jQuery什么意思