echarts 柱状图设置圆角

在ECharts中，要设置柱状图的圆角，有几种方法可以实现。

一种方法是在series中直接设置itemStyle的barBorderRadius属性。例如，在option中的series中添加itemStyle属性，设置barBorderRadius为一个数组，数组的值分别代表四个角的圆角半径。比如表示左上角和右上角为4的圆角，左下角和右下角为0的圆角。这样，所有的柱状图都会应用这个圆角效果。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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