Question

该插件允许定义回调，以允许或拒绝用户输入的节点选择（激活节点方法）。

$.jstree.defaults.checkbox.visible checkbox plugin

a callback (function) which is invoked in the instance's scope and receives two arguments - the node and the event that triggered the activate_node call. Returning false prevents working with the node, returning true allows invoking activate_node. Defaults to returning true.