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增加甜甜圈图的内半径以及如何在甜甜圈图中写入

我正在尝试增加甜甜圈图的内半径，并且还能够在甜甜圈图中写入。
$ scope.donut = new RGraph.Pie('myDonut'，$ scope.donutData)
。设置 ('线宽'，5)

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