Chart Js -根据值全局设置条形图颜色

<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],
        }]
    },
    options: {
        scales: {
            y: {
                beginAtZero: true
            }
        },
        plugins: {
            legend: {
                display: false
            }
        },
        // 设置全局颜色
        plugins: {
            beforeInit: function(chart) {
                var color = Chart.helpers.color;
                var dataset = chart.data.datasets[0];
                var bars = chart.getDatasetMeta(0).data;
                var colors = ['red', 'green', 'blue']; // 自定义颜色数组

                bars.forEach(function(bar, index) {
                    bar.backgroundColor = color(colors[index % colors.length]).alpha(0.7).rgbString();
                });
            }
        }
    }
});