[splitNumber](https://ecomfe.github.io/echarts-doc/public/en/option.html#yAxis.splitNumber)
is mainly used to determine the number of displayed label and ticks.
Probably this approach can be tried:
when changing the size of a chart,
```js
function onChartContainerDomChange() {
var height = chart.getHeight();
var splitNumber = height < 200
? 2
: height < 300
? 4
: null;
console.log(height, splitNumber);
chart.setOption({
yAxis: {splitNumber: splitNumber}
});
chart.resize();
}
```
[ Full content available at:
https://github.com/apache/incubator-echarts/issues/9026 ]
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