Chartjs:悬停条形图时在html元素中显示值

<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>

<canvas id="myChart"></canvas>

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ['数据1', '数据2', '数据3'],
        datasets: [{
            label: '数据集',
            data: [10, 20, 30],
            backgroundColor: 'rgba(0, 123, 255, 0.5)'
        }]
    },
    options: {
        tooltips: {
            callbacks: {
                label: function(tooltipItem) {
                    return tooltipItem.yLabel;
                }
            }
        }
    }
});