单击交互式chart.js条形图，获取JS中标签和组的值

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

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ['标签1', '标签2', '标签3'], // 标签数组
        datasets: [{
            label: '组1', // 组名称
            data: [10, 20, 30], // 组的值数组
            backgroundColor: 'rgba(255, 99, 132, 0.2)', // 组的背景颜色
            borderColor: 'rgba(255, 99, 132, 1)', // 组的边框颜色
            borderWidth: 1 // 组的边框宽度
        }]
    },
    options: {
        onClick: function(e) {
            var activePoints = myChart.getElementsAtEvent(e);
            if (activePoints.length > 0) {
                var chartData = activePoints[0]['_chart'].config.data;
                var idx = activePoints[0]['_index'];
                var label = chartData.labels[idx];
                var value = chartData.datasets[0].data[idx];
                console.log('点击了标签：' + label + '，值为：' + value);
            }
        }
    }
});