先看樣式

  var _t = this; 
var setting = {
         view: {
            fontCss: {
               color: "#5E5F61"
            },
            showIcon: true,
            showLine: false
         },
         data: {
            simpleData: {
               enable: true
            }
         },
         callback: {
            beforeClick: _t.beforeClick_,
            onClick: 
 
function (event, treeId, treeNode) {
               _t.zTreeOnClick(event, treeId, treeNode);
            }
         }
      };
     zTree_Menu = $.fn.zTree.getZTreeObj("group_file");
var nodes = zTree_Menu.transformToArray(zTree_Menu.getNodes());
      for (var i = 0; i < nodes.length; i++) {
         
 
if (nodes[i].parentCode == "0" && nodes[i].name[nodes[i].name.length - 2] == "0") {
            //沒有子級滑鼠禁止
            $("#" + nodes[i].tId).css({ "cursor": "not-allowed" });
            $("#" + nodes[i].tId + '_ico').css("cursor", "not-allowed");
            $("#" + nodes[i].tId + '_switch').css("cursor", "not-allowed");
         } 
 
else {
            $("#" + nodes[i].tId).css("cursor", "pointer");
         }
      }
  /****
* 單擊樹之前
*/
   beforeClick_: function (treeId, treeNode, clickFlag) {
      // 沒有子級禁止點選
      if (treeNode.parentCode == "0" && treeNode.name[treeNode.name.length - 2] == "0") {
         return false;
      }
      return true;
   }


//html
 <div class="m-folders">
      <ul id="group_file" class="ztree"></ul>
   </div>