怎么在页面上画图？

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> DSTree </TITLE>
<META NAME="Author" CONTENT="[email protected]" >
<style>
body,td{font:12px verdana}
#treeBox{background-color:#fffffa;}
#treeBox .ec{margin:0 5 0 5;}
#treeBox .hasItems{font-weight:bold;height:20px;padding:3 6 0 6;margin:2px;cursor:hand;color:#555555;border:1px solid #fffffa;}
#treeBox .Items{height:20px;padding:3 6 0 6;margin:1px;cursor:hand;color:#555555;border:1px solid #fffffa;}
</style>
<base href="http://vip.5d.cn/star/dstree/" />
<script>
//code by star 20003-4-7
var HC = "color:#990000;border:1px solid #cccccc";
var SC = "background-color:#efefef;border:1px solid #cccccc;color:#000000;";
var IO = null;
function initTree(){
var rootn = document.all.menuXML.documentElement;
var sd = 0;
document.onselectstart = function(){return false;}
document.all.treeBox.appendChild(createTree(rootn,sd));
}
function createTree(thisn,sd){
var nodeObj = document.createElement("span");
var upobj = document.createElement("span");
with(upobj){
style.marginLeft = sd*10;
className = thisn.hasChildNodes()?"hasItems":"Items";
innerHTML = "<img src=expand.gif class=ec>" + thisn.getAttribute("text") +"";

onmousedown = function(){
if(event.button != 1) return;
if(this.getAttribute("cn")){
this.setAttribute("open",!this.getAttribute("open"));
this.cn.style.display = this.getAttribute("open")?"inline":"none";
this.all.tags("img")[0].src = this.getAttribute("open")?"expand.gif":"contract.gif";
}
if(IO){
IO.runtimeStyle.cssText = "";
IO.setAttribute("selected",false);
}
IO = this;
this.setAttribute("selected",true);
this.runtimeStyle.cssText = SC;
}
onmouseover = function(){
if(this.getAttribute("selected"))return;
this.runtimeStyle.cssText = HC;
}
onmouseout = function(){
if(this.getAttribute("selected"))return;
this.runtimeStyle.cssText = "";
}
oncontextmenu = contextMenuHandle;
onclick = clickHandle;
} if(thisn.getAttribute("treeId") != null){
upobj.setAttribute("treeId",thisn.getAttribute("treeId"));
}
if(thisn.getAttribute("href") != null){
upobj.setAttribute("href",thisn.getAttribute("href"));
}
if(thisn.getAttribute("target") != null){
upobj.setAttribute("target",thisn.getAttribute("target"));
} nodeObj.appendChild(upobj);
nodeObj.insertAdjacentHTML("beforeEnd","<br/>") if(thisn.hasChildNodes()){
var i;
var nodes = thisn.childNodes;
var cn = document.createElement("span");
upobj.setAttribute("cn",cn);
if(thisn.getAttribute("open") != null){
upobj.setAttribute("open",(thisn.getAttribute("open")=="true"));
upobj.getAttribute("cn").style.display = upobj.getAttribute("open")?"inline":"none";
if( !upobj.getAttribute("open"))upobj.all.tags("img")[0].src ="contract.gif";
}

for(i=0;i<nodes.length;cn.appendChild(createTree(nodes[i++],sd+1)));
nodeObj.appendChild(cn);
}
else{
upobj.all.tags("img")[0].src ="endnode.gif";
}
return nodeObj;
}
window.onload = initTree;
</script><script>
function clickHandle(){
// your code here
}
function contextMenuHandle(){
event.returnValue = false;
var treeId = this.getAttribute("treeId");
// your code here
}
</script>
</HEAD>
<BODY>
<xml id=menuXML>
<?xml version="1.0" encoding="GB2312"?>
<DSTreeRoot text="根节点" open="true" href="http://" treeId="123">

<DSTree text="技术论坛" open="false" treeId="">
<DSTree text="5DMedia" open="false" href="http://" target="box" treeId="12">
<DSTree text="网页编码" href="http://" target="box" treeId="4353" />
<DSTree text="手绘" href="http://" target="box" treeId="543543" />
<DSTree text="灌水" href="http://" target="box" treeId="543543" />
</DSTree>
<DSTree text="BlueIdea" open="false" href="http://" target="box" treeId="213">
<DSTree text="DreamWeaver & JS" href="http://" target="box" treeId="4353" />
<DSTree text="FlashActionScript" href="http://" target="box" treeId="543543" />
</DSTree>
<DSTree text="CSDN" open="false" href="http://" target="box" treeId="432">
<DSTree text="JS" href="http://" target="box" treeId="4353" />
<DSTree text="XML" href="http://" target="box" treeId="543543" />
</DSTree>
</DSTree> <DSTree text="资源站点" open="false" treeId="">
<DSTree text="素材屋" href="http://" target="box" treeId="12" />
<DSTree text="桌面城市" open="false" href="http://" target="box" treeId="213">
<DSTree text="壁纸" href="http://" target="box" treeId="4353" />
<DSTree text="字体" href="http://" target="box" treeId="543543" />
</DSTree>
<DSTree text="MSDN" open="false" href="http://" target="box" treeId="432">
<DSTree text="DHTML" href="http://" target="box" treeId="4353" />
<DSTree text="HTC" href="http://" target="box" treeId="543543" />
<DSTree text="XML" href="" target="box" treeId="2312" />
</DSTree>
</DSTree></DSTreeRoot>
</xml>
<table style="position:absolute;left:100;top:100;">
<tr><td id=treeBox style="width:400px;height:200px;border:1px solid #cccccc;padding:5 3 3 5;" valign=top></td></tr>
<tr><td style="font:10px verdana;color:#999999" align=right>by <font color=#660000>sTar</font><br/> 2003-4-8</td></tr>
</table>
</BODY>
</HTML>

1  上面的错误
<html>
<head>
<title> 鼠标选取框 </title>
<script language="JavaScript">
var x0;
var y0;
var select=false;function document.onmousedown()
{
    x0=document.body.scrollLeft+event.clientX;// 鼠标起始横坐标
    y0=document.body.scrollTop+event.clientY;// 鼠标起始纵坐标
    select=true;
}function document.onmouseup()
{
    select=false;
}function document.onselectstart()
{
    return false;
}function document.ondrag()
{
    return false;
}function document.onmousemove()
{
    if (select)
    {
        dd.style.display='';// 如果鼠标已经正确移动，将层设置为可视。
        if(document.body.scrollLeft+event.clientX-x0>0) // 从左向右
        {
            dd.style.left=x0;
            dd.style.width=document.body.scrollLeft+event.clientX-x0;
        }
        else // 从右向左
        {
            dd.style.left=document.body.scrollLeft+event.clientX;
            dd.style.width=x0-(document.body.scrollLeft+event.clientX);
        }
        if (document.body.scrollTop+event.clientY-y0>0)// 从上向下
        {
            dd.style.top=y0;
            dd.style.height=document.body.scrollTop+event.clientY-y0;
        }
        else// 从下向上
        {
            dd.style.top=document.body.scrollTop+event.clientY;
            dd.style.height=y0-(document.body.scrollTop+event.clientY);
        }
    }
}
</script>
</head><body>
<table id="dd" style="position:absolute; width:0px; height:0px; z-index:99; border:1px black dashed; display:none;"><tr><td></td></tr></table>
</body>
</html>

使用vml,可以实现各种图形,在网上搜一下,有教学文档,比较简单的.

调试易

怎么在页面上画图？

解决方案 »