jstree的增删改

//增删改
        function demo_create() {
            var ref = $('#using_json').jstree(true),
                sel = ref.get_selected();
            if(!sel.length) { return false;}
            sel = sel[0];
            sel = ref.create_node(sel, {"type":"file"});
            if(sel) {
                ref.edit(sel);
            }
        }
        function demo_rename() {
            var ref = $('#using_json').jstree(true),
                sel = ref.get_selected();
            if(!sel.length) { return false; }
            sel = sel[0];
            ref.edit(sel);
        }
        function demo_delete() {
                var ref = $('#using_json').jstree(true),
                    sel = ref.get_selected();
                var chilid=ref.get_parent(sel);
                var chillength=$("#"+chilid).children().length;
                console.log(sel.length);
                console.log(chillength);
                if(!sel.length) { return false; }
                if(chillength==0){
                    layer.confirm('这是唯一目录，确定要删除么!!!', {
                        btn: ['确定','放弃'],//按钮
                        skin:'layui-layer-molv',
                        icon:5
                    }, function(){
                        layer.closeAll('dialog');
                        ref.delete_node(sel);
                    }, function () {
                        layer.closeAll('dialog');
                    });
                }else{
                    layer.confirm('您确定要删除么！', {
                        btn: ['确定','放弃'], //按钮
                        skin:'layui-layer-molv',
                        icon:5
                    }, function(){
                        layer.closeAll('dialog');
                        ref.delete_node(sel);
                    }, function () {
                        layer.closeAll('dialog');
                    });
                }
        }

$('#using_json').jstree(true).get_json()//获得整个树的json

data.instance.get_node(data.selected[0]).a_attr.href=$("#"+jstreeid).find("a:eq(0)").attr("href");// 修改选中节点的href