extjs3中重新加载 grid的数据，修改URL

This.store.proxy= new Ext.data.HttpProxy({
			                    url : 'http://localhost/CHYGHCoreService/REST/ZSCHY.svc/ProjectSearch',
			                    method : 'GET'
		                    });
					This.store.reload({params:{start:0, limit:20,date:date,group:group}});