让easyui的panel关闭时回收内存

/** * @author 孙宇 *  * @requires jQuery,EasyUI *  * panel关闭时回收内存 */$.fn.panel.defaults.onBeforeDestroy = function() {var frame = $('iframe', this);try {if (frame.length > 0) {frame[0].contentWindow.document.write('');frame[0].contentWindow.close();frame.remove();if ($.browser.msie) {CollectGarbage();}}} catch (e) {}};