怎么向在div的右侧添加滚动条，只要右侧有~~~~~~~~~~

[fox1025701]

就像一个窗口是的，右侧带个滚动条

[cpio]

<div style="width:100;height:50;overflow-y:scroll">
asdfas<br>asdfas<br>asdfas<br>asdfas<br>asdfas<br>
asdfas<br>asdfas<br>asdfas<br>asdfas<br>asdfas<br>
asdfas<br>asdfas<br>asdfas<br>asdfas<br>asdfas<br>
</div>