D3 绘制韦恩图示例：
http://www.benfrederickson.com/venn-diagrams-with-d3.js/
https://github.com/benfred/venn.js/tree/master/examples
G2 绘制韦恩图示例：
https://antv-2018.alipay.com/zh-cn/g2/3.x/demo/other/venn.html
效果
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