According the unique identifier tId of zTree, quick get the node's JSON data object.
Get the node from the cache, don't need to search from all nodes.
Please use zTree object to executing the method.
The unique identifier of node.
JSON data object of the node which be searched.
If no result, return null.
var treeObj = $.fn.zTree.getZTreeObj("tree");
var node = treeObj.getNodeByTId("tree_10");