利用javascirpt我们可以很容易的在HTML中实现树，而不需要使用ASP,JSP,PHP等等编写动态程序，当然如果要和数据库结合，下面的代码也很容易移植。
首先，我们看一下实现这个树形结构的javascript代码。
common.js
<!--
function showCurrentSection()
{
var objCurrentSection = document.getElementById("navcurrentsection");
if (objCurrentSection != null)
{
objCurrentSection.style.display = "block";
objCurrentSection.parentElement.childNodes[0].className = "open";
if (objCurrentSection.parentElement.parentElement.nodeName == "UL")
showSection(objCurrentSection.parentElement.parentElement);
}
}
function showSection(objSection)
{
objSection.style.display = "block";
objSection.parentElement.childNodes[0].className = "open";
if (objSection.parentElement.parentElement != null && objSection.parentElement.parentElement.nodeName == "UL")
showSection(objSection.parentElement.parentElement);
}
-->
function showCurrentSection()
{
var objCurrentSection = document.getElementById("navcurrentsection");
if (objCurrentSection != null)
{
objCurrentSection.style.display = "block";
objCurrentSection.parentElement.childNodes[0].className = "open";
if (objCurrentSection.parentElement.parentElement.nodeName == "UL")
showSection(objCurrentSection.parentElement.parentElement);
}
}
function showSection(objSection)
{
objSection.style.display = "block";
objSection.parentElement.childNodes[0].className = "open";
if (objSection.parentElement.parentElement != null && objSection.parentElement.parentElement.nodeName == "UL")
showSection(objSection.parentElement.parentElement);
}
-->
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