Chart.js yAxes Ticks stepSize not working (fiddle)

问题

I have created a line chart with these options for the yAxis:

yAxes: [{
    ticks: {
        precision: 1,
        stepSize: 18.1,
        min: 148.5,
        max: 220.9
    }
}]

I would like, therefore, the yAxis scales to be like this:

220.9
202.8
184.7
166.6
148.5

However, when I provide this code, I am getting this data.

Please see this fiddle for an example: https://jsfiddle.net/wxLzdrcm/

How can I make the yAxis ticks add up like I have described?

回答1:

This question was asked at least twice (1, 2).

The solution is to use min and max values so that stepSize is a factor of max - min, allowing the chart to actually use the specified stepSize:

yAxes: [{
  ticks: {
    maxTicksLimit: 5,
    min: 144.8, // 18.1 * 8
    max: 235.3, // 18.1 * 13
    stepSize: 18.1,
  },
}]

---

An alternative would be using suggestedMin and suggestedMax rather than min and max, which allows Chart.js to calculate its own min and max:

In your case, you just need to apply:

yAxes: [{
  ticks: {
    maxTicksLimit: 5,
    suggestedMin: 148.5,
    suggestedMax: 220.9,
    stepSize: 18.1,
  },
}]

来源：https://stackoverflow.com/questions/62897653/chart-js-yaxes-ticks-stepsize-not-working-fiddle