开源客户端基于javascript的2D数据绘制?

I'm wondering if there are any 2D graph plotting libraries that run on the client side using JavaScript? The basic idea is that you could put up a plot in a browser and the user can change things like X and Y scales and limits, zooming in and out, without having to constantly reload the web page from the server. The data itself would be fetched via AJAX, which would allow a user to also just I'm wondering if there are any 2D graph plottin