jQuery addClass example

Change class name on click in jQuery

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.13.0/moment.min.js"></script>
  <canvas id="chart1" height="300" width="500"></canvas>

JavaScript

//資料標題
    var labels = ['輕微', '普通', '嚴重', '崩潰'];
    var total1 = 0;

    var ctx = document.getElementById('chart1').getContext('2d');
    var pieChart = new Chart(ctx, {
        type: 'doughnut',
        data: {
            labels: labels,
            datasets: [{
                //預設資料
                data: [10, 20, 30, 40],
                backgroundColor: [
                    //資料顏色
                    "#F0F8FF",
                    "#5599FF",
                    "#FFFF77",
                    "#FF8888"
                ],
            }],
        },
        options: {

            animation: {
                animateScale: true,
                animateRotate: true
            },
            // 關於滑過後的 顯示
            tooltips: {
                callbacks: {
                    label: function (tooltipItem, data) {
                        var dataset = data.datasets[tooltipItem.datasetIndex];
                        //計算總和
                        var sum = dataset.data.reduce(function (previousValue, currentValue, currentIndex, array) {
                            return previousValue + currentValue;
                        });
                        var currentValue = dataset.data[tooltipItem.index];
                        var percent = Math.round(((currentValue / sum) * 100));
                        return " " + data.labels[tooltipItem.index] + ":" + currentValue + " (" + percent + " %)";
                    }
                }
            },

            //提示項目的處理
            legend: {
                display: true,
                position: 'left',
                labels: {
               			fontFamily: "微軟正黑體",
                    fontSize: 15,
                    fontColor: 'rgba(0,0,0,0.8)',
                    boxWidth: 15,
                    generateLabels: function (chart) {
                        var data = chart.data;
                        if (data.labels.length && data.datasets.length) {
                            return...