chartjs：使用移动设备时不呈现

Question

我正在使用chartsJS库（2.4）来创建圆环图。如果我使用普通电脑，它的工作完美。但是如果尝试使用移动设备访问它，则图表根本不会呈现。我究竟做错了什么？代码在

之下

<script>
    var data = {
        labels: [
            "Team 1",
            "Team 2",
        ],
        datasets: [
            {
                data: [<?=$team1_pct?>, <?=$team2_pct?>],
                backgroundColor: [
                    "#14c9ea",
                    "#0f1e2d",
                ],
                hoverBackgroundColor: [
                    "#14c9ea",
                    "#0f1e2d",
                ]
            }]
    };
    var canvas=document.getElementById("myChart");
    var ctx=canvas.getContext("2d");

    var myDoughnutChart = new Chart(ctx, {
        type: 'doughnut',
        data: data,
        options:{ responsive: true,
            title: {
            display: true,
            text: 'Head to Head',
            },
        cutoutPercentage: 60,
            animation: {
                onComplete: function (animation) {
                    var canvas = document.getElementById("myChart");
                    var ctx = canvas.getContext("2d");
                    ctx.font = "36px verdana";
                    ctx.fillText("VS", 110, 142);
                }
            }
        },

    });

</script>

谢谢。