eachChild

iterates through the first-level children of the specified branch

void eachChild(string pid,function code, [object master,boolean all] );

pid	string	the parent (branch) id
code	function	a function that needs calling for each data item
master	object	an object that the function is applied to (this by default)
all	boolean	if true, hidden (as well as hidden by filtering) items are iterated

tree.data.eachChild("1.2",function(obj){ console.log(obj.id)});

Details

Note that

eachChild iterates through the first-level child nodes of the branch (without the specified parent node).
The eachChild's function takes the data object as a parameter.
If you want to iterate through all children of a branch - use the eachSubItem method.