ie11 legend truncate 不支持？echarts 折线配置项内容和展示

      option = {
    title: {
        text: 'Awesome Chart'
    },
    legend: {
        data: ['哈哈哈哈哈哈', '嘿嘿嘿嘿嘿', 'asdfasdfasdf'],
        formatter: function (name) {
            return echarts.format.truncateText(name, 40, '14px Microsoft Yahei', '…');
        },
        tooltip: {
            show: true
        }
    },
    xAxis: {
        data: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat']
    },
    yAxis: {},
    series: [{
        name: '哈哈哈哈哈哈',
        type: 'line',
        data:[220, 182, 191, 234, 290, 330, 310]
    }, {
        name: '嘿嘿嘿嘿嘿',
        type: 'line',
        data:[220, 182, 191, 234, 290, 330, 310]
    }, {
        name: 'asdfasdfasdf',
        type: 'line',
        data:[220, 182, 191, 234, 290, 330, 310]
    }]
};