ztree 展開一級節點 | ztree只顯示到二級目錄

// 默認展開一級節點
var nodes = tree.getNodesByParam("level", 0);
for (var i = 0; i < nodes.length; i++) {
    tree.expandNode(nodes[i], true, false, false);
}

//ztree只顯示到二級目錄
var nodes2 = tree.getNodesByParam("level", 1);
for (var j = 0; j < nodes2.length; j++) {
    tree.removeChildNodes(nodes2[j]);
}