dtree的使用前后台实例

来源：互联网发布：阿里云授权对象编辑：程序博客网时间：2024/05/21 11:31

前台：

<%@ page language="java"  import="java.util.*"  contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%><%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><html><head><meta charset="UTF-8"><title>树</title><meta http-equiv="pragma" content="no-cache" /><meta http-equiv="cache-control" content="no-cache" /><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3" /><meta http-equiv="description" content="This is my page" /><link href="../../style/css.css" rel="stylesheet" /><link href="/fftg/styles/dtree.css" rel="stylesheet"/><link href="../../style/jquery-ui.css" rel="stylesheet" /><link rel="stylesheet" href="../../style/font-awesome.css" /><link href="../../style/maskPage.css" rel="stylesheet"/><script src="../../scripts/jquery-1.9.0.js"></script><script src="../../scripts/jquery-ui.js"></script><script type="text/javascript" src="../../scripts/jquery.PrintArea.js"></script><script type="text/javascript" src="../../scripts/jquery.ui.datepicker-zh-CN.js"></script><script src="../../scripts/jquery.ui.note.js"></script> <script type="text/javascript" src="/fftg/scripts/dtree.js"></script><script type="text/javascript">var typeid, typepid,typename,typeUrl;//把点击树的鼠标事件获取的id等定义为全局变量//dtree1.js中，点击树的结节时触发的事件，在这里重写它function get(pid, id, name, shelfType, isDe, isDelete, property) {if($("#updateMaterialNext").dialog("isOpen")){$("#drugTypeId1").val(id);$("#drugTypeName1").val(name);}else{$("#drugTypeId").val(id);$("#drugTypeName").val(name);}}function getPid(pid,name,drugTypeUrl){typepid=pid;typename=name;typeUrl=drugTypeUrl/* alert("pid:"+typepid+"--name:"+typename+"--url:"+typeUrl); */}  $(document).ready(function(){  $("#tab1").hide(),  $("#tab2").hide()});     function showAdd(){//显示隐藏的表单用于补充消息if(typepid==''||typepid==undefined||typepid==null){alert("请先选择分类再添加")return;}    $("#showAdd").click(      $("#tab1").show(),  $("#tab2").hide()  );    $("#parentName").text("上级分类名称：" + typename);}function showUpdate(){//显示隐藏的表单用于补充消息if(typepid==''||typepid==undefined||typepid==null){alert("请先选择分类再修改")return;}    $("#showUpdate").click(    $("#tab1").hide(),    $("#tab2").show()  );    $("#updateForm #typeName").attr('value',typename);//文本框中设置默认值} function addTree(){var pid=typepid;//获取当前节点的id作为父id并且用来查询是否有子节点var name= $("#addForm #typeName").val(); //获取新输入的分类名称作为节点名称var drugTypeUrl=typeUrl;//获取的分类的url,在后台追加新的name就是当前地址if(name==''||name==undefined||name==null){alert("提示：请填写相应分类！");return;}$("#addForm #parentCode").val(pid);$("#addForm #drugTypeUrl").val(drugTypeUrl);addForm.action="addDrugType";addForm.submit(); /* $.ajax({type : "post",url : "addDrugType",dataType : "json",async : false,data : {pid : pid,name : name,drugTypeUrl:drugTypeUrl},success : function(msg) { alert("ajax()");},error : function(msg) {alert(msg);alert("网络错误！");}}); */  }function updateTree(){var pid=typepid;//获取当前节点的id作为父id并且用来查询是否有子节点var name= $("#updateForm #typeName").val(); //获取新输入的分类名称作为节点名称var drugTypeUrl=typeUrl;//获取的分类的url,在后台追加新的name就是当前地址if(name==''||name==undefined||name==null){alert("提示：请填写相应分类！");return;}$("#updateForm #parentCode").val(pid);$("#updateForm #drugTypeUrl").val(drugTypeUrl);updateForm.action="updateDrugType";updateForm.submit();  /* $.ajax({type : "post",url : "updateDrugType",dataType : "json",async : false,data : {pid : pid,name : name,drugTypeUrl:drugTypeUrl},success : function(msg) { alert("ajax()");},error : function(msg) {alert("网络错误！");}}); */}</script></head><body>  <table border="0" width="150" cellpadding="0" cellspacing="0">   <tr >  <td height="5">  </td>  </tr>  <tr >  <td width="150"><div id="drugType_tree"  title="药理分类" class="dtree" style="left: 20px;"><script type="text/javascript">dtree = new dTree('dtree');dtree.add(0,-1,"药理分类"); //创建一个树对象<c:forEach items="${treeList }"  var="m" varStatus="status">     dtree.add('${m.typeCode}','${m.parentCode}','${m.typeName}','','${m.drugTypeUrl}');</c:forEach>document.write(dtree);var $browsers = $("input[name=id]");$browsers.removeAttr("checked");/* $cancel.click(function(e){// 移除属性,两种方式都可//$browsers.removeAttr("checked");$browsers.attr("checked",false);}); */</script><div align="center" ><input type="button" id="showAdd" onclick="showAdd()"  value="添加">    <input type="button" id="showUpdate" onclick="showUpdate()"  value="修改">    </div> </div>   </td>   <td width="200">    <div id ="tab1">    <form action="" id="addForm" name="addForm" method="post">    <input type="hidden" id="parentCode" name="parentCode">    <input type="hidden" id="drugTypeUrl" name="drugTypeUrl">     <table id="table1" name="table1" >      <tr> <td>分类名称 ： <input type="text" id="typeName" name="typeName" /></td></tr>      <tr> <td><p id="parentName"></p></td></tr>      <tr><td><input type="button" onclick="addTree()"  value="保存"></td></tr>     </table>     </form>    </div>   </td>    <td width="200">    <div align="center" id ="tab2" >    <form action="" id="updateForm" name="updateForm" method="post">     <input type="hidden" id="parentCode" name="parentCode">     <input type="hidden" id="drugTypeUrl" name="drugTypeUrl">     <table id="table2" name="table2" >       <tr> <td>分类名称 ： <input type="text" id="typeName" name="typeName" value=""/></td></tr>       <tr><td><input type="button" onclick="updateTree()"  value="保存修改"></td></tr>     </table>     </form>    </div>   </td>  </tr>  </table> </body>  </html>

后台：

<span style="font-size:18px;">@Controller@RequestMapping(value = "/drupType")public class DrupTypeController {/*private static Logger logger = LoggerFactory.getLogger(DrupTypeController.class);*/private IDrugTypeService drugTypeService;@Resource(name = "drugTypeService")public void setDrugTypeService(IDrugTypeService drugTypeService) {this.drugTypeService = drugTypeService;}/** * 初始化配置文件 */PropertiesLoader pro=new PropertiesLoader("key.properties");/** * 跳转ztree树管理页面 * @param  * @return *  */@RequestMapping(value="/findDrugTypeJsp")public String findMaterialNextJsp(HttpServletRequest request){return "groupMat/drugTypeDef";}/** * 获取ztree数据 * @param  * @return */@RequestMapping(value="/getDrugType")public String getDrugType(HttpServletRequest request , HttpServletResponse response){Map<String, Object> map = new HashMap<String, Object>();//String pid = request.getParameter("pid");//map.put("parentCode", pid);List<?> treeList = drugTypeService.findDrugTypeList(map); request.setAttribute("treeList", treeList); return "groupMat/drugTypeDef";//利用Json插件将Array转换成Json格式/*try {response.getWriter().print(JSONArray.fromObject(drugTypeList).toString());} catch (IOException e) {e.printStackTrace();}*/}/*public Date greatDate(){//日期格式化方法SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date date = new Date();String stringDate = sDateFormat.format(date);try {date = sDateFormat.parse(stringDate);} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}return date;}*//** * 修改TypeCode后两位方法 * @param  * @return */public String updateTypeCode (DrugType drugType){String code = drugType.getTypeCode();String firstCode = code.substring(0,code.length()-2);String lastCode=code.substring(code.length()-2,code.length());Integer TypeCode=new Integer(lastCode);Integer newCode =  TypeCode+1;String newLastCode = String.format("%02d",newCode);String newTypeCode = firstCode+newLastCode;return newTypeCode;}/** * 添加ztree数据 * @param  * @return */@SuppressWarnings("unused")@RequestMapping(value="/addDrugType")public String addDrugType(DrugType drugType,HttpServletRequest request , HttpServletResponse response){/*String pid = request.getParameter("pid");String name = request.getParameter("name");String drugTypeUrl = request.getParameter("drugTypeUrl");*/Map<String, Object> map = new HashMap<String, Object>();map.put("parentCode", drugType.getParentCode());Date date = new Date();List<?> treeList = drugTypeService.findDrugTypeList(map);if(treeList==null||treeList.isEmpty() ){drugType.setTypeCode(drugType.getParentCode()+"01");drugType.setDrugTypeUrl(drugType.getDrugTypeUrl()+">"+drugType.getTypeName());drugType.setCreateDate(date);}else{//如果不为空则说明有子节点，取出排序后的最后一个子节点在他的code上加1就是新加节点的code值DrugType loasDrugType = (DrugType) treeList.get(treeList.size()-1);String newTypeCode = updateTypeCode(loasDrugType);/*String code = drugType.getTypeCode();String firstCode = code.substring(0,code.length()-2);String lastCode=code.substring(code.length()-2,code.length());Integer TypeCode=new Integer(lastCode);Integer newCode =  TypeCode+1;String newLastCode = String.format("%02d",newCode);String newTypeCode = firstCode+newLastCode;*/drugType.setTypeCode(newTypeCode);drugType.setDrugTypeUrl(drugType.getDrugTypeUrl()+">"+drugType.getTypeName());drugType.setCreateDate(date);}drugTypeService.saveDrugType(drugType); request.setAttribute("treeList", treeList); return "redirect:/drupType/getDrugType";}/** * 修改ztree数据 * @param  * @return */@SuppressWarnings("unused")@RequestMapping(value="/updateDrugType")public String updateDrugType(DrugType drugType,HttpServletRequest request , HttpServletResponse response){//String pid = request.getParameter("pid");//String name = request.getParameter("name");//String drugTypeUrl = request.getParameter("drugTypeUrl");Map<String, Object> map = new HashMap<String, Object>();map.put("typeCode", drugType.getParentCode());Date date = new Date();List<?> treeList =  drugTypeService.findDrugTypeList(map);if(treeList!=null && !treeList.isEmpty() ){DrugType newDrugType =(DrugType) treeList.get(0);newDrugType.setTypeCode(drugType.getParentCode());newDrugType.setTypeName(drugType.getTypeName());String url = drugType.getDrugTypeUrl();int lastIndexOf = url.lastIndexOf(">");if(lastIndexOf==-1){newDrugType.setDrugTypeUrl(drugType.getTypeName());}else{String firstUrl = url.substring(0, lastIndexOf);String lastUrl = url.substring(lastIndexOf, url.length());lastUrl = drugType.getTypeName();String drugTypeUrl = firstUrl+">"+lastUrl;newDrugType.setDrugTypeUrl(drugTypeUrl);}newDrugType.setCreateDate(date);drugTypeService.update(newDrugType);} treeList =  drugTypeService.findDrugTypeList(map); request.setAttribute("treeList", treeList); return "redirect:/drupType/getDrugType";}}</span>

dtree 文件：

/*--------------------------------------------------|

| dTree 2.05 | www.destroydrop.com/javascript/tree/ |

|---------------------------------------------------|

| Copyright (c) 2002-2003 Geir Landr? |

| |

| This script can be used freely as long as all |

| copyright messages are intact. |

| |

| Updated: 17.04.2003 |

|--------------------------------------------------*/

// Node object

function Node(id, pid, name, url, title, target, icon, iconOpen, open) {

this.id = id;

this.pid = pid;

this.name = name;

this.url = url;

this.title = title;

this.target = target;

this.icon = icon;

this.iconOpen = iconOpen;

this._io = open || false;

this._is = false;

this._ls = false;

this._hc = false;

this._ai = 0;

this._p;

};

// Tree object

function dTree(objName) {

this.config = {

target : null,

folderLinks : true,

useSelection : true,

useCookies : true,

useLines : true,

useIcons : true,

useStatusText : false,

closeSameLevel: false,

inOrder : false

}

this.icon = {

root : '/fftg/images/dtree/base.gif',

folder : '/fftg/images/dtree/folder.gif',

folderOpen : '/fftg/images/dtree/folderopen.gif',

node : '/fftg/images/dtree/page.gif',

empty : '/fftg/images/dtree/empty.gif',

line : '/fftg/images/dtree/line.gif',

join : '/fftg/images/dtree/join.gif',

joinBottom : '/fftg/images/dtree/joinbottom.gif',

plus : '/fftg/images/dtree/plus.gif',

plusBottom : '/fftg/images/dtree/plusbottom.gif',

minus : '/fftg/images/dtree/minus.gif',

minusBottom : '/fftg/images/dtree/minusbottom.gif',

nlPlus : '/fftg/images/dtree/nolines_plus.gif',

nlMinus : '/fftg/images/dtree/nolines_minus.gif'

};

this.obj = objName;

this.aNodes = [];

this.aIndent = [];

this.root = new Node(-1);

this.selectedNode = null;

this.selectedFound = false;

this.completed = false;

};

// Adds a new node to the node array

dTree.prototype.add = function(id, pid, name, url, title, target, icon, iconOpen, open) {

this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title, target, icon, iconOpen, open);

};

// Open/close all nodes

dTree.prototype.openAll = function() {

this.oAll(true);

};

dTree.prototype.closeAll = function() {

this.oAll(false);

};

// Outputs the tree to the page

dTree.prototype.toString = function() {

var str = '<div class="dtree">\n';

if (document.getElementById) {

if (this.config.useCookies) this.selectedNode = this.getSelected();

str += this.addNode(this.root);

} else str += 'Browser not supported.';

str += '</div>';

if (!this.selectedFound) this.selectedNode = null;

this.completed = true;

return str;

};

// Creates the tree structure

dTree.prototype.addNode = function(pNode) {

var str = '';

var n=0;

if (this.config.inOrder) n = pNode._ai;

for (n; n<this.aNodes.length; n++) {

if (this.aNodes[n].pid == pNode.id) {

var cn = this.aNodes[n];

cn._p = pNode;

cn._ai = n;

this.setCS(cn);

if (!cn.target && this.config.target) cn.target = this.config.target;

if (cn._hc && !cn._io && this.config.useCookies) cn._io = this.isOpen(cn.id);

if (!this.config.folderLinks && cn._hc) cn.url = null;

if (this.config.useSelection && cn.id == this.selectedNode && !this.selectedFound) {

cn._is = true;

this.selectedNode = n;

this.selectedFound = true;

}

str += this.node(cn, n);

if (cn._ls) break;

}

}

return str;

};

// Creates the node icon, url and text

dTree.prototype.node = function(node, nodeId) {

var str = '<div class="dTreeNode">' + this.indent(node, nodeId);

if (this.config.useIcons) {

if (!node.icon) node.icon = (this.root.id == node.pid) ? this.icon.root : ((node._hc) ? this.icon.folder : this.icon.node);

if (!node.iconOpen) node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node;

if (this.root.id == node.pid) {

node.icon = this.icon.root;

node.iconOpen = this.icon.root;

}
//if(node.pid!=-1){
str += '<input type="radio" name="id" id="c'+this.parEnum+'" onClick="getPid(\''+node.id+'\',\''+node.name+'\',\''+node.title+'\')" value="' + node.id +'" class="cx"/>';
//}
str += '<img id="i' + this.obj + nodeId + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" alt="" />';

}
if (node.url) {

str += '<a id="s' + this.obj + nodeId + '" class="' + ((this.config.useSelection) ? ((node._is ? 'nodeSel' : 'node')) : 'node') + '" href="' + node.url + '"';

if (node.title) str += ' title="' + node.title + '"';

if (node.target) str += ' target="' + node.target + '"';

if (this.config.useStatusText) str += ' onmouseover="window.status=\'' + node.name + '\';return true;" onmouseout="window.status=\'\';return true;" ';

if (this.config.useSelection && ((node._hc && this.config.folderLinks) || !node._hc))

str += ' onclick="javascript: ' + this.obj + '.s(' + nodeId + ');"';

str += '>';

}

else if ((!this.config.folderLinks || !node.url) && node._hc && node.pid != this.root.id)

str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');" class="node">';

str += node.name;

if (node.url || ((!this.config.folderLinks || !node.url) && node._hc)) str += '</a>';

str += '</div>';

if (node._hc) {

str += '<div id="d' + this.obj + nodeId + '" class="clip" style="display:' + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';">';

str += this.addNode(node);
str += '</div>';

}

this.aIndent.pop();

return str;

};

// Adds the empty and line icons

dTree.prototype.indent = function(node, nodeId) {

var str = '';

if (this.root.id != node.pid) {

for (var n=0; n<this.aIndent.length; n++)

str += '<img src="' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '" alt="" />';

(node._ls) ? this.aIndent.push(0) : this.aIndent.push(1);

if (node._hc) {

str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');"><img id="j' + this.obj + nodeId + '" src="';

if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus;

else str += ( (node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls && this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) );

str += '" alt="" /></a>';

} else str += '<img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" alt="" />';

}

return str;

};

// Checks if a node has any children and if it is the last sibling

dTree.prototype.setCS = function(node) {

var lastId;

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n].pid == node.id) node._hc = true;

if (this.aNodes[n].pid == node.pid) lastId = this.aNodes[n].id;

}

if (lastId==node.id) node._ls = true;

};

// Returns the selected node

dTree.prototype.getSelected = function() {

var sn = this.getCookie('cs' + this.obj);

return (sn) ? sn : null;

};
// Highlights the selected node

dTree.prototype.s = function(id) {

if (!this.config.useSelection) return;

var cn = this.aNodes[id];

if (cn._hc && !this.config.folderLinks) return;

if (this.selectedNode != id) {

if (this.selectedNode || this.selectedNode==0) {

eOld = document.getElementById("s" + this.obj + this.selectedNode);

eOld.className = "node";

}

eNew = document.getElementById("s" + this.obj + id);

eNew.className = "nodeSel";

this.selectedNode = id;

if (this.config.useCookies) this.setCookie('cs' + this.obj, cn.id);

}

};

// Toggle Open or close

dTree.prototype.o = function(id) {

var cn = this.aNodes[id];

this.nodeStatus(!cn._io, id, cn._ls);

cn._io = !cn._io;

if (this.config.closeSameLevel) this.closeLevel(cn);

if (this.config.useCookies) this.updateCookie();

};

// Open or close all nodes

dTree.prototype.oAll = function(status) {

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n]._hc && this.aNodes[n].pid != this.root.id) {

this.nodeStatus(status, n, this.aNodes[n]._ls)

this.aNodes[n]._io = status;

}

}

if (this.config.useCookies) this.updateCookie();

};

// Opens the tree to a specific node

dTree.prototype.openTo = function(nId, bSelect, bFirst) {

if (!bFirst) {

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n].id == nId) {

nId=n;

break;

}

}

}

var cn=this.aNodes[nId];

if (cn.pid==this.root.id || !cn._p) return;

cn._io = true;

cn._is = bSelect;

if (this.completed && cn._hc) this.nodeStatus(true, cn._ai, cn._ls);

if (this.completed && bSelect) this.s(cn._ai);

else if (bSelect) this._sn=cn._ai;

this.openTo(cn._p._ai, false, true);

};

// Closes all nodes on the same level as certain node

dTree.prototype.closeLevel = function(node) {

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n].pid == node.pid && this.aNodes[n].id != node.id && this.aNodes[n]._hc) {

this.nodeStatus(false, n, this.aNodes[n]._ls);

this.aNodes[n]._io = false;

this.closeAllChildren(this.aNodes[n]);

}

}

}

// Closes all children of a node

dTree.prototype.closeAllChildren = function(node) {

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n].pid == node.id && this.aNodes[n]._hc) {

if (this.aNodes[n]._io) this.nodeStatus(false, n, this.aNodes[n]._ls);

this.aNodes[n]._io = false;

this.closeAllChildren(this.aNodes[n]);

}

}

}

// Change the status of a node(open or closed)

dTree.prototype.nodeStatus = function(status, id, bottom) {

eDiv = document.getElementById('d' + this.obj + id);

eJoin = document.getElementById('j' + this.obj + id);

if (this.config.useIcons) {

eIcon = document.getElementById('i' + this.obj + id);

eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon;

}

eJoin.src = (this.config.useLines)?

((status)?((bottom)?this.icon.minusBottom:this.icon.minus):((bottom)?this.icon.plusBottom:this.icon.plus)):

((status)?this.icon.nlMinus:this.icon.nlPlus);

eDiv.style.display = (status) ? 'block': 'none';

};

// [Cookie] Clears a cookie

dTree.prototype.clearCookie = function() {

var now = new Date();

var yesterday = new Date(now.getTime() - 1000 * 60 * 60 * 24);

this.setCookie('co'+this.obj, 'cookieValue', yesterday);

this.setCookie('cs'+this.obj, 'cookieValue', yesterday);

};

// [Cookie] Sets value in a cookie

dTree.prototype.setCookie = function(cookieName, cookieValue, expires, path, domain, secure) {

document.cookie =

escape(cookieName) + '=' + escape(cookieValue)

+ (expires ? '; expires=' + expires.toGMTString() : '')

+ (path ? '; path=' + path : '')

+ (domain ? '; domain=' + domain : '')

+ (secure ? '; secure' : '');

};

// [Cookie] Gets a value from a cookie

dTree.prototype.getCookie = function(cookieName) {

var cookieValue = '';

var posName = document.cookie.indexOf(escape(cookieName) + '=');

if (posName != -1) {

var posValue = posName + (escape(cookieName) + '=').length;

var endPos = document.cookie.indexOf(';', posValue);

if (endPos != -1) cookieValue = unescape(document.cookie.substring(posValue, endPos));

else cookieValue = unescape(document.cookie.substring(posValue));

}

return (cookieValue);

};

// [Cookie] Returns ids of open nodes as a string

dTree.prototype.updateCookie = function() {

var str = '';

for (var n=0; n<this.aNodes.length; n++) {

if (this.aNodes[n]._io && this.aNodes[n].pid != this.root.id) {

if (str) str += '.';

str += this.aNodes[n].id;

}

}

this.setCookie('co' + this.obj, str);

};

// [Cookie] Checks if a node id is in a cookie

dTree.prototype.isOpen = function(id) {

var aOpen = this.getCookie('co' + this.obj).split('.');

for (var n=0; n<aOpen.length; n++)

if (aOpen[n] == id) return true;

return false;

};

// If Push and pop is not implemented by the browser

if (!Array.prototype.push) {

Array.prototype.push = function array_push() {

for(var i=0;i<arguments.length;i++)

this[this.length]=arguments[i];

return this.length;

}

};

if (!Array.prototype.pop) {

Array.prototype.pop = function array_pop() {

lastElement = this[this.length-1];

this.length = Math.max(this.length-1,0);

return lastElement;

}

};

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dtree的使用 前后台实例

dtree的使用前后台实例