Ztree 默认展开二级菜单

在初始加载树形控件的时候调用zTree的expandNode (node, expandFlag, sonSign, focus, callbackFlag)方法

node：树形节点

expandFlag:是否展开节点

sonSign：是否展开其子孙节点

focus：展开或折叠节点后是否设置焦点

callbackFlag：这行该方法是否触发回调函数

var zNodes = "";

        var setting = {
            check: {
                enable: true
            },
            data: {//数据加载
                keep: {
                    parent: true,
                    leaf: true
                },
                simpleData: {
                    enable: true,
                    idKey: "Id",
                    pIdKey: "Pid",
                },
                key: {
                    name: "Name"
                }
            }
        };

function Inint() {//初始化加载节点
            $.ajax({
                global: true,
                async: false,
                cache: false,
                dataType: "json",
                url: '../Ajax/test.ashx',
                type: "post",
                //data: { "roleId": GetQueryString("roleId") },
                success: function (data) {
                    zNodes = data;
                }
            });
        };

$(function () {
            Inint(); //加载数据
            $.fn.zTree.init($("#zTree"), setting, zNodes); 

            var treeObj = $.fn.zTree.getZTreeObj("zTree");
            var nodes = treeObj.getNodes();
            for (var i = 0; i < nodes.length; i++) { //设置节点展开
                treeObj.expandNode(nodes[i], true, false, true);
            }
        });

<div class="control" style="overflow: auto; height:270px;">
            <ul id="zTree">
            </ul>
</div>