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Chart.js:带有局部虚线的折线图

我正在尝试绘制折线图,该折线图应显示部分实线和部分虚线(表示实际和预期数据).我发现这个例子在版本2.0.0-alpha上完美运行

var lineChartData = {
    labels: ['A', 'B', 'C', 'D', 'E', 'F', 'G'],
    datasets: [{
        label: "My First dataset",
        data: [1, 8, 3, 4, 2, 3, 4],
        borderColor: '#66f',
        borderDash: [20, 30],
        pointBackgroundColor: "transparent"
    },{
        label: "My First dataset",
        data: [1, 8, 3, 4, 2, , ],
        borderColor: '#66f',
        pointBackgroundColor: "transparent"
    }]
};

var ctx = document.getElementById("chart").getContext("2d");
var myChart = new Chart(ctx, {
    type: "line",
    data: lineChartData,
    options: {
        elements: {
            line: {
                fill: false
            }
        }
    }
});

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