问gVisLineChart级数之间的相加间距

EN

{v: 100, f:'10'}  // <-- will plot 100 but display 10

google.charts.load('current', {
  packages: ['corechart']
}).then(function () {
  var chartData = [
    ['x', 'y0', 'y1', 'y2'],
    [0, 10, 12, 18],
    [2, 16, 18, 19],
    [4, 18, 19, 24],
    [6, 26, 28, 22],
    [8, 13, 15, 21],
    [10, 32, 31, 33]
  ];

  var data = google.visualization.arrayToDataTable(chartData);

  var columns = [0];
  for (var i = 1; i < data.getNumberOfColumns(); i++) {
    addColumn(i);
  }

  var view = new google.visualization.DataView(data);
  view.setColumns(columns);

  var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
  chart.draw(view, {
    height: 400,
    vAxis: {
      textPosition: 'none'
    }
  });

  function addColumn(index) {
    columns.push({
      calc: function (dt, row) {
        return {
          v: dt.getValue(row, index) + (index * 20),
          f: dt.getFormattedValue(row, index)
        };
      },
      label: data.getColumnLabel(index),
      type: data.getColumnType(index)
    });
  }
});

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart_div"></div>