zTree 获取当前节点下所有子节点（包含当前选中的节点）

var setting = {
showLine: true,
callback: {
　　beforeClick: zTreeBeforeClick
}
};

//当前选中的节点
function zTreeBeforeClick(treeId, treeNode, clickFlag) {  

  arrSelected=getChildNodes(treeNode);  

};

function getChildNodes(treeNode) {

var childNodes = zTree.transformToArray(treeNode);
var nodes = new Array();
for(i = 0; i < childNodes.length; i++) {
nodes[i] = childNodes[i].id;
}
return nodes.join(",");
}