easyui 怎么获取选择子节点及父节点 的值

$('#combotree-scene-id').combotree({
url: "",
checkbox:true,
multiple:true,
async:false,
method:'get',
onLoadSuccess:function(node, data){
formatComboTreeValue();
},
onCheck:function(node, checked){
formatComboTreeValue();
},
onClick:function(node, checked){
formatComboTreeValue();
}
});
}

function formatComboTreeValue() {

var value = $('#combotree-scene-id').combotree('getText');
if(value.indexOf("根节点,") >= 0) {
var endIndex = value.indexOf(',');
value = value.substring(endIndex+1);
$('#combotree-scene-id').combotree('setText', value);
}
}