let treeObj = $.fn.zTree.init($("#tree"), setting, departments);
treeObj.expandAll(true); //默认展开
var nodes = treeObj.getNodes();
if (nodes.length > 0) {
var node = treeObj.selectNode(nodes[0]);//默认选中根节点
}
zTree默认选中根节点,默认展开
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转载自blog.csdn.net/weixin_42971942/article/details/82934194
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