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
				 */
				
					Ext.lib.Point = function(x, y) {
				        if (Ext.isArray(x)) {
				            y = x[1];
				            x = x[0];
				        }
				        var me = this;
				        me.x = me.right = me.left = me[0] = x;
				        me.y = me.top = me.bottom = me[1] = y;
				    };
				
				    Ext.lib.Point.prototype = new Ext.lib.Region();