easyui機構樹 滿足選中節點需求

<span style="font-size:14px;">				onBeforeCheck: function(node,checked){
					if(node.level !='1' && checked==true){
						$("#search_orgId").combotree('tree').tree("options").cascadeCheck = false;
					}else if(node.level !='1' && node.level !='2' && checked==false){
							$("#search_orgId").combotree('tree').tree("options").cascadeCheck = false;
					}else{
						$("#search_orgId").combotree('tree').tree("options").cascadeCheck = true;
					}
				}</span>