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请问echarts的柱状图Y轴最大数值(extend:[0, 100])是如何计算出来的?

使用柱状图时,传入数据data: [120, 210, 150, 80, 70, 110, 130],echarts是如何计算出Y轴最大值为250的?


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内部的计算规则
通俗点来说
如果你最大值是 200 那么取200 250 取250 300取300 210 取 250 310 取350 260取 300

/*假设为210*/
var num = Math.ceil(210/50) * 50 ;  //结果为250

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