Ext JS是一个创建丰富互联网应用程序的跨浏览器的JavaScrip库。它包含：高效率

				/*
				 * Ext JS Library 3.0 Pre-alpha
				 * Copyright(c) 2006-2008, Ext JS, LLC.
				 * licensing@extjs.com
				 * 
				 * http://extjs.com/license
				 */
				
								if(Ext.isIE){function fnCleanUp(){var p=Function.prototype;delete p.createSequence;delete p.defer;delete p.createDelegate;delete p.createCallback;delete p.createInterceptor;window.detachEvent("onunload",fnCleanUp);}				window.attachEvent("onunload",fnCleanUp);}})();