xtree js结构树控件 This new version is based on objects, so you do not create the actual html code for the tree yourself, you create an object (the tree's root folder) and then you add child items to this. Once you're done adding items the actual html code is generated and inserted into the page. This makes it very easy to create and update the content of the tree (or to dynamically generate it). If you've seen Erik's new xMenu you will notice that it's working in similar way.