EChart – 根据Json返回值生成Bar图

http://cho2.tistory.com/entry/EChart-%EC%B0%A8%ED%8A%B8-%EB%9D%BC%EC%9D%B4%EB%B8%8C%EB%9F%AC%EB%A6%AC-Echart-%EC%A0%95%EB%A6%AC

http://www.cnblogs.com/jerron/p/4520345.html