通过 js timer 控制 form 多次提交

Form.Element.AfterActivity = function(element, callback, delay) {  element = $(element);  if (!delay) delay = 0.25;  new Form.Element.Observer(element, delay, function(element, value) {    if (element.activity_timer) clearTimeout(element.activity_timer);    element.activity_timer = setTimeout(function() { callback(element); }, delay * 1000 + 50);  });};<script type="text/javascript">//<![CDATA[ Form.Element.AfterActivity('btn_submit', function(element) { $(element).up('form').submit(); }, 0.35);//]]></script>