1、打开制作软件，新建AS3文档。
2、打开组件面板，快捷键（Ctrl+F7）。
3、找到UIScrollBar组件，用鼠标拖到舞台上。
4、在舞台添加一个动态文本框，大小可设置如下，并使用任意变形工作对刚才拖出来的组件进行大小调整，如下。
5、动态文本框属性设置如下。
6、下拉条组件属性设置如下。
7、选择下拉条组件，并在属性面板点击显示参数。设置scrollTargetName为txt
8、主时间轴加如下代码：
txt.text="asdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfaasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nsdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\nasdfasdfasdfasdfasdfasdf\n";
其中\n是换行标识符。导出效果如下
