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onCheck: function(node, checked){
var str = "";
if(checked){
if($('#tt').tree('isLeaf', node.target)){
str += node.text +","
}else{
var nodes = $('#tt').tree('getChildren', node.target);
for(var i in nodes){
str += nodes[i].text +",";
}
}
}
alert(str.substring(0, str.length-1));
}