记录节点的层级
初始化节点数据时,由 zTree 增加此属性,请勿提前赋值
根节点 level = 0,依次递增
var treeObj = $.fn.zTree.getZTreeObj("tree"); var sNodes = treeObj.getSelectedNodes(); if (sNodes.length > 0) { var level = sNodes[0].level; }