ChartJS饼图如何默认仅显示2个图例数据

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'pie',
    data: {
        labels: ['数据1', '数据2', '数据3', '数据4', '数据5'],
        datasets: [{
            data: [12, 19, 3, 5, 2],
            backgroundColor: ['#ff6384', '#36a2eb', '#cc65fe', '#ffce56', '#4bc0c0']
        }]
    },
    options: {
        legend: {
            display: true,
            labels: {
                filter: function(legendItem, chartData) {
                    return chartData.labels.indexOf(legendItem.text) <= 1; // 只显示前两个图例数据
                }
            }
        }
    }
});