google图表更改单个直方图数据点的颜色

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

google.charts.load('current', {'packages':['corechart']});
google.charts.setOnLoadCallback(drawChart);

function drawChart() {
  var data = google.visualization.arrayToDataTable([
    ['数据点', '数值'],
    ['数据点1', 10],
    ['数据点2', 20],
    ['数据点3', 30],
    ['数据点4', 40]
  ]);

  var options = {
    title: '直方图',
    colors: ['#FF0000', '#00FF00', '#0000FF', '#FFFF00']  // 设置数据点颜色
  };

  var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
  chart.draw(data, options);
}

<script type="text/javascript">
  google.charts.setOnLoadCallback(drawChart);
</script>