如何对本脚本设置，让树型菜单在网页开启时就完全展开.（有tree_maker.js文件支持,如需查看请回复)

Question

<SCRIPT LANGUAGE="JavaScript" src="tree_maker.js">
var Tree_CHILD=-1;
var Tree_LAST=-2;
var Tree_ROOT=-3;
var Tree_FIRST=-4;
var Tree_SIBLING=-5;
var Tree_PREV=-6;
var Tree_NEXT=-7;
var Tree_const_begin_folder=-1;
var Tree_const_folder=0;
var Tree_const_end_folder=1;
var Tree_const_file=2;
var Tree_LINK=3;
var Tree_SCRIPT=4;
var Tree_const_end=5;
var Tree_isNC6 = (document.getElementById && !document.all)?true:false;
var Tree_isIE = (document.all)?true:false;
if(Tree_isNC6==false&&Tree_isIE==false)
alert("???????????");
//---------------------------
var Tree_treeView_index=0;
var Tree_node_index=0;
var Tree_treeView_array=new Array();
var Tree_node_array=new Array();
//----------------------------
function Tree_action(type,script,link,target,treeViewIndex)
{
this.type=type;
this.link=link;
this.target=target;
this.script=script;
this.treeViewIndex = treeViewIndex;
}
//---------------------------
function Tree_treeView()
{
this.showLine=false;
this.lineFolder="./";//???????
this.Indent=13;
this.useImage=this.useHint=this.useStatus=this.useTitleAsStatus
=this.showSelect=this.useTitleAsHint=true;
this.fileImg=this.folderImg1=this.folderImg2="";
this.folderClass1=this.folderClass2=this.folderClass3=
this.fileClass1=this.fileClass2=this.fileClass3="";
this.target="_blank";
//----------------
this.selectID=null;
this.id=Tree_treeView_index;
this.flag=false;
Tree_treeView_array[this.id]=this;
var action=new Tree_action(0,0,0,0,Tree_treeView_index++);
this.container=new Tree_node("","","","","",action);
this.container.expand=true;
//---------call back function
this.callback_expanding=function callback_expanding(nodeID){return true;}
this.callback_expanded=function callback_expanded(nodeID){}
this.callback_collapsing=function callback_collapsing(nodeID){return true;}
this.callback_collapsed=function callback_collapsed(nodeID){}
this.callback_click=function callback_click(nodeID){return true;}
this.callback_rightClick=function callback_rightClick(nodeID){return true;}
//---------
this.getRoot=function getRoot(){
return this.container.childCount>0?this.container.child[0]:null;
}
this.click=function click(nodeID){
var node=this.getNode(nodeID);
if(node) Tree_clickNode(nodeID);
}
this.helper=function helper(node){
if(node.childCount==0) return;
this.expand(node.id,true);
var i=0;
while(i<=node.childCount-1)
this.helper(node.child[i++]);
}
this.expandAll=function expandAll(){
this.flag=true;
var i=0;
while(i<=this.container.childCount-1)
this.helper(this.container.child[i++]);
this.flag=false;
}
this.select=function select(nodeID,flag){
var node=this.getNode(nodeID);
if(node){
flag=(typeof(flag)=="boolean"?flag:true);
if(flag)Tree_selectNode(nodeID);
else {
var td=document.getElementById("Tree_td_"+nodeID);
this.selectID=null;
if(this.showSelect && td)
td.className=Tree_node_array[nodeID].childCount>0?
this.folderClass1:this.fileClass1;
}
node.selected=flag;
}
}
this.setText=function setText(nodeID,text){
var node=this.getNode(nodeID);
if(node)
node.setText(text);
}
this.getImage=function getImage(nodeID){
var node=this.getNode(nodeID);
if(node)return node.getImage();
return null;
}
this.getSelect=function getSelect(){//??????
if(this.selectID!=null)
return this.getNode(this.selectID);
return null;
}
this.expand=function expand(nodeID,isExpand){
var node=this.getNode(nodeID);
this.flag=true;
var div=document.getElementById("Tree_expand_"+nodeID);
var td=document.getElementById("Tree_td_"+nodeID);
if(node){
if(node.expanded==isExpand)return;
if(td)td.onclick();
else node.expanded=isExpand;
}
this.flag=false;
}
this.clear=function clear(){
this.container.child.length=this.container.childCount=0;
this.refresh();
}
this.add=function add(relate_ID,nOption,nIndex,text,hint,status,img1,img2){
if(nOption==Tree_ROOT) {
return this.container.addChild(nIndex,text,hint,status,img1,img2);
}
if(nOption==Tree_CHILD){
var parent=this.getNode(relate_ID);
if(parent==null) return null;
return parent.addChild(nIndex,text,hint,status,img1,img2);
}
if(nOption==Tree_SIBLING){
if(relate_ID==this.container.id) return null;
var node=this.getNode(relate_ID);
if(node==null) return null;
return node.addSibling(nIndex,text,hint,status,img1,img2);
}
return null;
}
this.del=function del(id){
if(id==this.container.id)
return;
var obj=this.getNode(id);
if(obj)obj.parent.delChild(obj.index);
}
this.getNode=function getNode(nID){
if(nID==this.container.id)return null;
var obj=null;
try{
obj=Tree_node_array[nID];
if(obj&&obj.id==nID)
return obj.container()==this.container?obj:null;
return null;
}
catch(e){return null;}
}
this.refresh=function refresh(){
this.container.refresh();
}
this.isReady=function isReady(){
return document.getElementById("Tree_treeView_"+this.id)!=null;
}
}
//-----------------------------

Answer 1

function Tree_node(text,hint,status,img1,img2,action)
{
this.img1=typeof(img1)=="string"?img1:"";
this.img2=typeof(img2)=="string"?img2:"";
this.text=typeof(text)=="string"?text:"";
this.hint=typeof(hint)=="string"?hint:"";
this.status=typeof(status)=="string"?status:"";
//------------------
this.child = new Array();
this.id=Tree_node_index;
this.parent=null;
this.action=action;
this.expanded=false;
this.selected=false;
this.index=0;
this.childCount=0;
Tree_node_array[Tree_node_index++]=this;
//------------------
this.addChild=function addChild(index,text,hint,status,img1,img2){
var action=new Tree_action(0,0,0,0,this.action.treeViewIndex);
var node=new Tree_node(text,hint,status,img1,img2,action);
this.add(node,index);
return node;
}
this.getImage=function getImage(){
return document.getElementById("Tree_img_"+this.id);
}
this.refresh=function refresh(){
if(this.parent)return;
var html="<DIV id='Tree_treeView_"+this.id+"'>";
var div=document.getElementById("Tree_treeView_"+this.id);
if(div==null)
document.write(html+this.getHtml()+"</DIV>");
else div.innerHTML=this.getHtml();
}
this.setLink=function setLink(link,target){
if(this.parent==null) return;
this.action.type=Tree_LINK;
this.action.target=target;
this.action.link=link;
}
this.setScript=function setScript(script){
this.action.type=Tree_SCRIPT;
this.action.script=script;
}
this.next=function getNext(){
if(this.parent==null || this.index>=this.parent.childCount-1)
return null;
return (this.parent.child[this.index+1]);
}
this.prev=function getPrev(){
if(this.parent==null || this.index<=0)
return null;
return (this.parent.child[this.index-1]);
}
this.container=function container(){
var tmp=this.parent;
while(tmp && tmp.parent)
tmp=tmp.parent;
return tmp;
}
this.addSibling=function addSibling(index,text,hint, status,img1,img2){
if(this.parent==null)return null;
if(index==Tree_PREV) index=this.index;
if(index==Tree_NEXT) index=this.index+1;
return this.parent.addChild(index,text,hint,status,img1,img2);
}
this.add=function add(childNode,index){
if(index==Tree_FIRST)
index=0;
if(index==Tree_LAST)
index=this.childCount;
if(index<0)
index=0;
if(index>this.childCount)
index=this.childCount;
var len=this.childCount-1;
while(len>=index){
this.child[len+1]=this.child[len];
this.child[len+1].index=len+1;
len--;
}
this.child[index]=childNode;
childNode.index=index;
childNode.parent=this;
this.childCount++;
var tree=this.getTreeView();
if(tree.flag==true) return;
if(tree.isReady()) {
var img = this.getImage();
if(this.parent && img )
img.src=Tree_imgSrc(this);
var line=document.getElementById("Tree_line_"+ this.id);
if(line)line.src=Tree_GetLineImg(this);
var parent=document.getElementById("Tree_expand_"+ this.id);
if(parent==null)
parent=document.getElementById("Tree_treeView_"+ this.id);
var div=document.createElement("DIV");
div.innerHTML=Tree_table(childNode)+"<DIV id=Tree_expand_"+ childNode.id+
" STYLE='{display:"+(childNode.expanded?"block;":"none;")
+"}'></DIV>";
var before=null;
if(this.childCount==1);
else if(this.childCount-1==index){
var node=this.child[index-1];
line=document.getElementById("Tree_line_"+ node.id);
if(line){
line.src=Tree_GetLineImg(node);
line=document.getElementsByName("Tree_td_line_"+ node.id);
for(var i=line.length-1;i>=0;i--)
line[i].innerHTML="<IMG  src="+tree.lineFolder+"/tree_I.gif>";
}
}
else {
line=document.getElementById("Tree_line_"+ this.child[index+1].id);
if(line)line.src=Tree_GetLineImg(this.child[index+1]);
before=document.getElementById("Tree_expand_"+this.child[index+1].id).parentNode;
}
parent.insertBefore(div,before);
}
else this.getTreeView().refresh();
}//--------------
this.contain=function contain(childnodeID)
{
if(childnodeID==null) return false;
var tmp=Tree_node_array[childnodeID];
while(tmp.parent)
{
if(tmp.parent==this||tmp==this)
return true;
tmp=tmp.parent;
}
return false;
}
//-----------
this.level=function level() {
if(this.parent==null) return -1;//container
var tmp=this;var n=0;
while(tmp && tmp.parent) {
n++;
tmp=tmp.parent;
}
return n;
}
this.getParentEx=function getParentEx(level){
var p=this;var n=this.level();
if(n<=1)return null;
while(p && level!=n){
p=p.parent;n--;
}
return p;
}
//-------------------
this.getType=function getType(){
return this.action.type;
}
this.getLink=function getLink(){
return this.action.link;
}
this.getTarget=function getTarget(){
return this.action.target;
}
this.getScript=function getScript(){
return this.action.script;
}

Answer 2

//------------
this.getTreeView=function getTreeView(){
return Tree_treeView_array[this.action.treeViewIndex];
}
//---------
this.delChild=function delChild(index)
{
if(index>this.childCount-1 || index<0)
return;
var len=this.childCount-1;
var tree=this.getTreeView();
if(tree.isReady())//refresh
{
var div=document.getElementById("Tree_expand_"+ this.child[index].id).parentNode;
div.parentNode.removeChild(div);
if(this.childCount==1&&this.parent)
{
this.childCount--;
var img = this.getImage();
if(img) img.src=Tree_imgSrc(this);
this.childCount++;
}
if(index==this.childCount-1 &&index>0){
this.childCount--;
var node=this.child[index-1];
var line=document.getElementsByName("Tree_td_line_"+ node.id);
for(var i=line.length-1;i>=0;i--)
line[i].innerHTML="<IMG style='width:19px;height:20px;visibility:hidden'>";
line=document.getElementById("Tree_line_"+node.id);
if(line) line.src=Tree_GetLineImg(node);
this.childCount++;
}
if(this.childCount==1){
this.childCount--;
var line=document.getElementById("Tree_line_"+ this.id);
if(line) line.src=Tree_GetLineImg(this);
document.getElementById("Tree_expand_"+this.id).style.display="none";
this.childCount++;
}
}
if(this.child[index].contain(tree.selectID))//select node will be deleted
tree.selectID=null;
Tree_node_array[this.child[index].id]=null;
while(index<=len-1)//move element
{
this.child[index+1].index=index;
this.child[index]=this.child[index+1];
index++;
}
this.child.length=(--this.childCount);
}
//--------------
this.getHtml=function getHtml()
{
var html="";
if(this.parent)
{
var tree=this.getTreeView();
html+="<DIV>";
html+=Tree_table(this);
html+="<DIV id=Tree_expand_"+ this.id+
" STYLE='{display:"+(this.expanded?"block;":"none;")+"}'>";
}
if(this.childCount>0) {//folder
for(var i=0;i<=this.childCount-1;i++)
{
html+=this.child[i].getHtml();
}
}
if(this.parent)html+="</DIV></DIV>";
return html;
}
//----------
this.setText=function setText(text){
var td=document.getElementById("Tree_td_"+this.id);
if(td) 
td.innerHTML=this.text=text;
}
//---
this.expand=function expand(toExpand){
this.getTreeView().expand(this.id,toExpand);
}
//--
this.click=function click() {
this.getTreeView().click(this.id);
}
//--
this.select=function select(flag) {
this.getTreeView().select(this.id,flag);
}
}
//--------------------
function Tree_on_action(action)//fire when click node
{
if(action.type==Tree_LINK)//link
{
var target = action.target;
if(target=="")//default target
{
target = Tree_treeView_array[action.treeViewIndex].target;
}
if( target=="_self"||target=="_top"||target=="_parent"||target=="_blank")
window.open(action.link,target);
else
{
var command = target +".location = action.link";
if(action.link!="") try{eval(command);}catch(e){alert("??????\r\n\r\n"+e.description);}
}
}
else if(action.type==Tree_SCRIPT)//run script
{
try{eval(action.script);}catch(e){alert("??????\r\n\r\n"+e.description);}
}
}
//----------------
function Tree_selectNode(nodeID)
{
var node=Tree_node_array[nodeID];
if(node==null||node.parent==null)return;
var tree=node.getTreeView();
var td=document.getElementById("Tree_td_"+nodeID);
var tdOld=document.getElementById("Tree_td_"+tree.selectID);
node.selected=true;//select node
if(tree.selectID!=null)
{
Tree_node_array[tree.selectID].selected=false;//unselect node
if(tree.showSelect && tdOld)
tdOld.className=Tree_node_array[tree.selectID].childCount>0?
tree.folderClass1:tree.fileClass1;//reset to normal class
}
tree.selectID=nodeID;
if(tree.showSelect && td)
td.className=Tree_node_array[tree.selectID].childCount>0?
tree.folderClass3:tree.fileClass3;
}
//--------------------
function Tree_clickNode(nodeID)
{
var node=Tree_node_array[nodeID];
if(node==null||node.parent==null)return;//root
var tree=node.getTreeView();
var div=document.getElementById("Tree_expand_"+nodeID);
var img=document.getElementById("Tree_img_"+nodeID);
var td=document.getElementById("Tree_td_"+nodeID);
//---------
if(!node.expanded && node.childCount>0 &&tree.flag==false)
if(tree.callback_expanding(nodeID)==false)//cancel expand
return;
if(node.expanded && node.childCount>0 &&tree.flag==false) 
if(tree.callback_collapsing(nodeID)==false)//cancel collapse
return;
node.expanded=!node.expanded && node.childCount>0;
if(tree.flag==false)Tree_selectNode(nodeID);
if(node.childCount>0)//folder
{
if(div)div.style.display=node.expanded?"block":"none";
if(img) img.src=Tree_imgSrc(node);
var line=document.getElementById("Tree_line_"+nodeID);
if(line)line.src=Tree_GetLineImg(node);
}
if(tree.callback_click(nodeID)==true &&tree.flag==false)//do action
Tree_on_action(node.action);
//------
if(node.expanded && node.childCount>0 &&tree.flag==false)
tree.callback_expanded(nodeID);
if(!node.expanded && node.childCount>0 &&tree.flag==false) 
tree.callback_collapsed(nodeID);
}
//----------------------------
function Tree_buildTree(node,treeView)//init treeView from array
{
Tree_treeView_array[treeView.id]=treeView;
treeView.flag=true;
var nLen = node.length-1;
var index = 0;
var count = 0;
var nodeChild=null;
var nodeParent=null;
while( index <= nLen )
{
switch( node[index] ){
case Tree_const_end:
break;
case Tree_const_begin_folder:
count++;
break;
case Tree_const_end_folder:
nodeParent=nodeParent.parent;
count--;
break;
case Tree_const_file:
var action = new Tree_action(node[index+5],node[index+6],node[index+7],node[index+8],treeView.id);
nodeChild=new Tree_node(node[index+1],node[index+2],node[index+3],node[index+4],node[index+4],action);
if(count==0) treeView.container.add(nodeChild,Tree_LAST);
else nodeParent.add(nodeChild,Tree_LAST);
break;
case Tree_const_folder:
var action = new Tree_action(node[index+6],node[index+7],node[index+8],node[index+9],treeView.id);
nodeChild=new Tree_node(node[index+1],node[index+2],node[index+3],node[index+4],node[index+5],action);
if(count==0) treeView.container.add(nodeChild,Tree_LAST);
else nodeParent.add(nodeChild,Tree_LAST);
nodeParent=nodeChild;
break;
}
index ++;
}
treeView.flag=false;
treeView.refresh();
}
//---------
function Tree_imgSrc(node)
{
var tree=node.getTreeView();
var src1=node.img1.length>0?node.img1:tree.folderImg1;
var src2=node.img2.length>0?node.img2:tree.folderImg2;
var src3=node.img1.length>0?node.img1:tree.fileImg;
return node.childCount>0?(node.expanded?src2:src1):src3;
}

Answer 3

生成树之后加这个语句：tree.expandAll();