echarts legend icon itemgap

根据引用，legend是Echarts中的一个组件，用于展示图例。根据引用，在配置legend时，可以通过设置icon属性来指定图例的形状，可选的形状包括circle、rect、roundRect、triangle、diamond、pin、arrow和none。同时，可以通过设置itemGap属性来调整图例之间的间距。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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