echarts 饼图 中 显示数值

在echarts饼图中，可以通过设置label属性来显示数值。在给series配置项设置label属性时，可以设置normal属性来控制数值的显示方式。通过设置normal的show为true，数值就会在饼图的内部显示出来。同时，还可以通过设置formatter属性来格式化数值的输出，比如将数值以百分比形式显示出来。<span class="em">1</span><span class="em">2</span>
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