如何在 Highcharts 饼图中当所占百分比为 0 时不显示边线及 0.0%

<div id="container" style="min-width:400px;height:400px"></div>

$(function () {
    $('#container').highcharts({
        chart: {
            plotBackgroundColor: null,
            plotBorderWidth: null,
            plotShadow: false
        },
        title: {
            text: '2014 某网站各浏览器浏览量占比'
        },
        tooltip: {
            headerFormat: '{series.name}<br>',
            pointFormat: '{point.name}: <b>{point.percentage:.1f}%</b>'
        },
        plotOptions: {
            pie: {
                allowPointSelect: true,
                cursor: 'pointer',
                dataLabels: {
                    enabled: true,
                    format: '<b>{point.name}</b>: {point.percentage:.1f} %',
                    style: {
                        color: (Highcharts.theme && Highcharts.theme.contrastTextColor) || 'black'
                    }
                }
            }
        },
        series: [{
            type: 'pie',
            name: '浏览器访问量占比',
            data: [
                ['Firefox',   45.0],
                ['IE',       26.8],
                {
                    name: 'Chrome',
                    y: 12.8,
                    sliced: true,
                    selected: true
                },
                ['Safari',    8.5],
                ['Opera',     6.2],
                ['其他',   0.7],
                ['多余的',   0.0]
            ]
        }]
    });
});

在上面添加一条测试数据：['多余的', 0.0]，此时的效果图：

为了让百分比为 0 时不显示边线及 0.0%，需要将 format 属性变为 formatter 函数：

$(function () {
    $('#container').highcharts({
        chart: {
            plotBackgroundColor: null,
            plotBorderWidth: null,
            plotShadow: false
        },
        title: {
            text: '2014 某网站各浏览器浏览量占比'
        },
        tooltip: {
            headerFormat: '{series.name}<br>',
            pointFormat: '{point.name}: <b>{point.percentage:.1f}%</b>'
        },
        plotOptions: {
            pie: {
                allowPointSelect: true,
                cursor: 'pointer',
                dataLabels: {
                    enabled: true,
                    formatter: function() {
                        if (this.percentage > 0)
                            return '<b>' + this.point.name + '</b>: ' + this.percentage + ' %'; // 这里进行判断
                    },
                    style: {
                        color: (Highcharts.theme && Highcharts.theme.contrastTextColor) || 'black'
                    }
                }
            }
        },
        series: [{
            type: 'pie',
            name: '浏览器访问量占比',
            data: [
                ['Firefox',   45.0],
                ['IE',       26.8],
                {
                    name: 'Chrome',
                    y: 12.8,
                    sliced: true,
                    selected: true
                },
                ['Safari',    8.5],
                ['Opera',     6.2],
                ['其他',   0.7],
                ['多余的',   0.0]
            ]
        }]
    });
});

效果图：