http://g.raphaeljs.com/ is completely free, based on the Raphael library, but comes with no documentation so you'll need to read through the source code of the examples.
So... what's wrong with commercial? I use commercial stuff all the time, because for larger projects, I have somebody to yell at when things don't work.
To that end, my recommendation for charting without plugins is always highcharts. I have yet yo see anything else that approaches it for power, flexibility, but most important... something that works well out of the box (unlike, say Plotr or Raphaeljs).
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使用 Google 图表本身怎么样？查看示例，甚至尝试一下。
不过这有一个缺点 - 您无法离线使用它。有关详细信息，请参阅常见问题解答。
Google 的带注释的时间线可能会满足您的需求。
您可能还想探索 dygraphs。它是开源的，看起来非常强大。
How about using Google charts itself. See an example or even play around with it.
Though this has one drawback - you cannot use it offline. See FAQ's for detail.
Google's Annotated Time Line probably would meet your needs.
You may want to explore dygraphs as well. It's open source and looks pretty powerful.
http://www.highcharts.com/ 对于非商业用途是免费的。
http://g.raphaeljs.com/ 完全免费，基于 Raphael 库，但不附带文档，因此您需要阅读示例的源代码。
http://www.highcharts.com/ is free for non-commercial use.
http://g.raphaeljs.com/ is completely free, based on the Raphael library, but comes with no documentation so you'll need to read through the source code of the examples.
那么……商业化有什么问题吗？我一直使用商业产品，因为对于较大的项目，当事情不起作用时我可以对某人大喊大叫。
为此，我对不使用插件的图表的建议始终是 highcharts。我还没有看到任何其他东西可以在功能、灵活性方面接近它，但最重要的是……开箱即用的东西（不像 Plotr 或 Raphaeljs）。
So... what's wrong with commercial? I use commercial stuff all the time, because for larger projects, I have somebody to yell at when things don't work.
To that end, my recommendation for charting without plugins is always highcharts. I have yet yo see anything else that approaches it for power, flexibility, but most important... something that works well out of the box (unlike, say Plotr or Raphaeljs).