js 中动态加载文件后，绘制不同的dygraphs

js 中动态加载文件后，绘制不同的dygraphs

参考:
http://www.runoob.com/js/js-output.html
http://developer.51cto.com/art/201009/226006.htm
------------------------------

https://github.com/popexizhi/learning_and_thinking/blob/master/js/eg/testLoadFileX.html