echarts圆环图图例鼠标移入

在echarts圆环图中，要实现图例鼠标移入的效果，可以通过设置emphasis.scale为true来开启鼠标移入高亮动画。同时，可以利用dispatchAction方法设置默认高亮块，然后检测鼠标的mouseover事件，当检测到鼠标悬停事件时，取消默认选中高亮。
在echarts的data()方法中，可以定义一个对象来设置图例的样式和位置。通过设置legendData中的triggerEvent为true，可以触发鼠标事件，从而实现图例的鼠标移入效果。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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