页面引入：
<html><head><meta charset="utf-8"><title>无标题文档</title><link rel="stylesheet" href="zTree_v3-master/css/zTreeStyle/zTreeStyle.css"><script type="text/javascript" src="zTree_v3-master/js/jquery.ztree.all.min.js"></script></head><body><div id="left" style="width:15%; height: 560px;"> <ul id="content" class="ztree" style="width:100%; height: 560px;"></ul></div></body></html>传入jsvar url = '.php';//php数据库页$(function(){ initZtree();//初始化树结构});function initZtree(){ var setting = { data: { simpleData: { enable: true } }, callback:{ onClick:zTreeOnClick } }; $.ajax({ url:url, data:{}, type:'post', dataType:'json', success:function(data){ var arr = eval(data); var zNodes = []; for(var i in arr){ zNodes.push({ id:arr[i][0], name:arr[i][1], pId:arr[i][2] }) } $.fn.zTree.init($("#content"), setting, zNodes); } });}function zTreeOnClick(event, treeId, treeNode) { $.ajax({ url:url, data:{type:'getUsers',id:treeNode.id}, type:'post', dataType:'json', }); };php数据库操作<?php$db = new MySQLi('localhost','root','root','z_1031');!mysqli_connect_error() or die('连接失败');$db->query('set names utf8');$type = "";//sql语句操作表$sql = "select id,name,pid from u_depart";$res = $db->query($sql);$arr = $res->fetch_all();echo json_encode($arr);