score:125

Accepted answer

Set the allowDecimals option in the y axis to false in order to prevent non integer tick marks from being displayed:

yAxis: {
    allowDecimals: false,
    labels: {
        style: {
            fontSize: '9px',
            width: '175px'
        }
    },
    title: {
        text: ''
    }
}

Here is a demonstration: http://jsfiddle.net/sBC9K/

score:0

Wiht echarts - "4.8.0" you just have to do,

options = {
            yAxis: {
              minInterval: 1
            }
          };

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