EasyUI ComboTree

<div class="easyui-dialog" id="user_dialog_role" title="选择用户功能权限" style="background-color:#fcfcfc;width:20%;height:85%;"
    data-options="closed:true,modal:true,
        buttons:[{
            text:'选 择',
            handler:function(){
                getChecked();
                $('#user_dialog_role').dialog('close');
            }
        }]">
    <form id="user_form_role" name="user_form_role" method="post">
        <div class="easyui-panel" fit="false" border="false">
            <ul id="user_tree_role" checkbox="true" cascadeCheck="false"
                style="background-color:#fafafa;"></ul>
                <input type="hidden" id="tree_type">
        </div>
    </form>
</div>

function userRole(type){
    $('#user_tree_role').tree({
        url: '${request.contextPath}/menu/tree',
        onLoadSuccess: function (e, node) {
            treeChecked(node, type);
        },
        onBeforeCheck: function (e, checked) {//设置栏目树选中无效,在用户点击勾选复选框之前触发，返回false可以取消选择动作
            /* if (type == 'new') {
                if (e.attributes.virtualColumn == 'true') {
                    return false;
                }
            } else {
                if (e.attributes.virtualColumn == 'true' || e.id == $('#column_tree').tree('getSelected').id) {
                    return false;
                }
            } */
        }
    });
    $('#tree_type').val(type);
    $('#user_dialog_role').dialog('open');
}

function treeChecked(node, type) {//遍历节点，符合要求的更新对应节点
    var menuVal = '';
    if (type == 'add') {
        menuVal = $('#menuID').val() + ",";
    } else {
        menuVal = $('#menuID_edit').val() + ",";
    }
    $.each(node, function (idx, val) {
        if (val instanceof Object) {
            var nodes = $('#user_tree_role').tree('find', val.id);
            if (nodes != null) {
                if (menuVal.indexOf(val.id + ",") != -1) {//选中已勾选的栏目
                    $('#user_tree_role').tree('update', {target: nodes.target, checked: true});
                }
            }
        }
        if (val.children) {
            treeChecked(val.children, type);//如果还有子节点则继续遍历
        }
    });
}

function getChecked() {
    var nodes = $('#user_tree_role').tree('getChecked');
    var s = '';
    var v = '';
    for (var i = 0; i < nodes.length; i++) {
        if (s != '') s += ',';
        s += nodes[i].text;
        if (v != '') v += ',';
        v += nodes[i].id;
    }
    var t=$('#tree_type').val();
    if(t=='add'){
        $('#menuID').val(v);
        $('#menu').textbox('setValue', s);
    }
    if(t=='edit'){
        $('#menuID_edit').val(v);
        $('#menu_edit').textbox('setValue', s);
    }
}