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echarts 折线图提示框问题

image.png

请问这个提示框下面的倒三角如何实现啊? 使用formatter实现不了. 求大神指教


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我个人觉得是用不太着给个小箭头。。

但是你可以这么写

tooltip: {
    extraCssText: 'background-image:url("data:image/svg+xml;base64,......");'
}

把带箭头的整个背景图转成base64,写进去。如果直接写路径的话会找不到


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