有了对如折线图、柱状图、饼图、堆叠条形图的图表类型的支持，Ext JS 图表在很多应用程序中有了用武之地。

With support for chart types such as line, column, pie, and stacked bar, Ext JS charts can find a place in most applications.

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bvg意味着我们想要一个垂直方向的条形图，而且其中的柱形条是分组的(而非堆叠的)。

BVG means we want a bar chart that is vertically-oriented and the bars are grouped (as opposed to stacked).

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