To hide any node.
1. This feature can't support the 'exedit' feature, so please don't use this feature in edit mode.
2. If you hide or show the nodes, it will effect the 'isFirstNode' and 'isLastNode' attribute.
3. Please use zTree object to executing the method.
JSON data object of the node to be hidden
Please ensure that this data object is an internal node data object in zTree.
no return value
var treeObj = $.fn.zTree.getZTreeObj("tree");
var nodes = treeObj.getNodes();
treeObj.hideNode(nodes[0]);