这个演示在你点击它的时候给出了条形图中的值。我不是chart.jsMaven，所以可能有更好的解决方案。
https://codepen.io/newschapmj1/pen/PerOzM

/* from https://github.com/chartjs/Chart.js/issues/2292 */
document.getElementById("myChart").onclick = function (evt) {
        var activePoints = myChart.getElementsAtEventForMode(evt, 'point', myChart.options);
        var firstPoint = activePoints[0];
        var label = myChart.data.labels[firstPoint._index];
        var value = myChart.data.datasets[firstPoint._datasetIndex].data[firstPoint._index];
        alert(label + ": " + value);
    };

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Chart.js版本= 3.2.1
关于official documentation：

onClick: (evt) => {
    const points = myChart.getElementsAtEventForMode(evt, 'nearest', { intersect: true }, true);

    if (points.length) {
        const firstPoint = points[0];
        var label = myChart.data.labels[firstPoint.index];
        var value = myChart.data.datasets[firstPoint.datasetIndex].data[firstPoint.index];
        alert(label +" : "+ value);
    }
}

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我需要一种从回调函数中获取图表的方法，因为我对多个图表使用相同的回调函数，所以我不能只说myChart
这可以工作，传递给图表选项-第二个参数称为“activeElements”，可用于获取图表：

onClick: (event, activeElements) => {
    if(activeElements.length === 0){
      alert("Chart is clickable but you must click a data point to drill-down")
    }
    const chart = activeElements[0]._chart
    const activePoints = chart.getElementsAtEventForMode(event, 'point', chart.options);
    const firstPoint = activePoints[0];
    const label = chart.data.labels[firstPoint._index];
    const value = chart.data.datasets[firstPoint._datasetIndex].data[firstPoint._index];
    alert(label + ": " + value);
}

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混合mikeb和Mrunalraj Redij答案。添加Hover并使用'index'和'intersect：false'来选择值，即使鼠标指针不在行上。

chartClickHoverCB(event, activeElements, chart) {
      const points = chart.getElementsAtEventForMode(event, 'index', { intersect: false }, true);

      if (points.length) {
          const firstPoint = points[0];
          var label = chart.data.labels[firstPoint.index];
          var value = chart.data.datasets[firstPoint.datasetIndex].data[firstPoint.index];
          console.log(label +" : "+ value);
      }
  }

chartOptions: ChartOptions = {
    ....
    onClick: this.chartClickHoverCB,
    onHover: this.chartClickHoverCB,
  };

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