如果将特定节点的 children 属性设置为 true 然后节点呈现为已关闭，当节点展开时， core.data.data 和 core.data.url 函数被调用（假设你使用的是AJAX）。

If you set the children property of a particular node to true then the node is rendered as closed, and when the node is expanded then core.data.data and core.data.url functions are called (this is assuming you are using AJAX).

查看使用AJAX的文档 http://www.jstree.com/docs/json/

See the docs for using AJAX http://www.jstree.com/docs/json/

或者你可以为 core.data 提供一个函数来加载树和任何节点。

Alternatively you can supply a function for core.data which is what is called to load the tree, and any nodes.