The Google Chart API lets you dynamically generate charts. To see the Chart API in action, open up a browser window and copy the following URL into it:
Google Chart API 英文：
http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World
Google Chart API 中文指南：
http://labs.cloudream.name/google/chart/api.html
