folderTree大概是个DIV的ID,innerHTML是它的属性,意即设置folderTree内部的HTML值你写的东西有问题吧<script language="javascript">
function initialize() {
  var xmlDoc
  var xslDoc  xmlDoc = new ActiveXObject("Microsoft.XMLDOM")
  xmlDoc.async = false;  xslDoc = new ActiveXObject("Microsoft.XMLDOM")
  xslDoc.async = false;  xmlDoc.load("tree/tree.xml")
  xslDoc.load("tree/tree.xsl")  folderTree.innerHTML = xmlDoc.documentElement.transformNode(xslDoc)
}
window.onload=initialize;
</script>
<div id="folderTree"></div>