基于cookie实现zTree树刷新后展开状态不变

$(function () {  //ztree设置  var setting = {    data: {      simpleData: {        enable: true,        idKey: "id",        pIdKey: "pId",        rootPId: null      }    },    callback: {      onExpand: onExpand,      onCollapse: onCollapse    }  };  $.ajax({    type: "POST",    url: "/Tech/TemplateTypeManage/GetData",    success: function (data) {      if (data && data.length != 0) {        $.fn.zTree.init($("#tree"), setting, data);        var treeObj = $.fn.zTree.getZTreeObj("tree");        var cookie = $.cookie("z_tree" + window.location);        if (cookie) {          z_tree = JSON2.parse(cookie);          for (var i = 0; i < z_tree.length; i++) {            var node = treeObj.getNodeByParam('id', z_tree[i])            treeObj.expandNode(node, true, false)          }        }      }    }  });});//end $function onExpand(event, treeId, treeNode) {  var cookie = $.cookie("z_tree" + window.location);  var z_tree = new Array();  if (cookie) {    z_tree = JSON2.parse(cookie);  }  if ($.inArray(treeNode.id, z_tree) < 0) {    z_tree.push(treeNode.id);  }  $.cookie("z_tree" + window.location, JSON2.stringify(z_tree))}function onCollapse(event, treeId, treeNode) {  var cookie = $.cookie("z_tree" + window.location);  var z_tree = new Array();  if (cookie) {    z_tree = JSON2.parse(cookie);  }  var index = $.inArray(treeNode.id, z_tree);  z_tree.splice(index, 1);  for (var i = 0; i < treeNode.children.length; i++) {    index = $.inArray(treeNode.children[i].id, z_tree);    if (index > -1) z_tree.splice(index, 1);  }  $.cookie("z_tree" + window.location, JSON2.stringify(z_tree))}