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TextArea组件，用鼠标拖到舞台上，并用任意变形工具进行变形，改变大小。
4、选择这个组件，在属性面板中点击显示参数按钮打开参数面板。
5、在属性面板设置该组件的实例名为text_area，最后在主时间轴加如下代码：text_area.text="asdfasdfas颊俄岿髭dfasdfasdfasdf\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";上面的代码中，\n是代表回车，要注意一下。
6、好了，简单的下拉条效果就出来了。