Ext 监听页面窗口大小

 ext 监听页面大小  实时获取页面的宽高

chartid为echarts图形，同步监听

       /**
		 * 监听统计图大小
		 */
		Ext.on('resize', function (width, height){
			var chartDiv = document.getElementById('chartid');
			var wvalue = width;
			chartDiv.style.width = wvalue;
			chartDiv.firstChild.style.width = wvalue;
			var hvalue = height-290;
			chartDiv.style.height = hvalue; 
			chartDiv.firstChild.style.height = hvalue; 
			if(null != managerDashboard.myChart && !Ext.isEmpty(managerDashboard.myChart))
				managerDashboard.myChart.resize();
		});