您可以使用 JScrollPane ，一个跨浏览器的jQuery插件，用你自己的滚动条创建一个自定义的scrollpane。

我知道你没有要求jQuery解决方案，但我认为这是在这种情况下明显的选择

I have a div with fixed width and height and overflow:scroll attribute.

I would like the vertical scroll bar appears in the left side of the div instead of right.

Any css or javascript solution? (supporting both ff and ie)

You can use JScrollPane, a cross-browser jQuery plugin, to create a custom scrollpane with your own scrollbar.

I know you didn't ask for a jQuery solution, but I think it's the obvious choice in this case