体征图echarts 折线配置项内容和展示

请问怎么在x轴的时间上方在加一个日期标签？并且分割线按天加粗？x轴现在表示的是每天的几个时间点。

      option = {
    title: {
        text: '体征图'
    },
    tooltip: {
        trigger: 'axis'
    },
    legend: {
        data: ['体温', '脉搏', '血压']
    },
    grid: { //top: '0%',
        left: '0%',
        right: '0%',
        bottom: '0%',
        containLabel: true
    },
    toolbox: {
        feature: {
            saveAsImage: {}
        }
    },
    xAxis: {
        position: 'top',
        splitLine: {
            show: true,
            splitnumber: 10
        },
        axisLabel: {
            interval: 0
        },
        type: 'category',
        boundaryGap: false,
        data: ['08', '10', '12', '14', '16', '18', '20', '22', '24', '08', '10', '12', '14', '16', '18', '20', '22', '24', '08', '10', '12', '14', '16', '18', '20', '22', '24']
    },
    yAxis: {
        type: 'value'
    },
    series: [{
            name: '体温',
            type: 'line',
            //stack: '总量',
            data: [36, 36.5, 36, 36.8, 36, 36.6, 36.2, 36, 36.7, 36.1, 36.2, 36, 36.5, 36.8, 36, 36.5, 36, 36.8, 36, 36.6, 36.2, 36, 36.7, 36.1, 36.2, 36, 36.5]
        },
        {
            name: '脉搏',
            type: 'line',
            //stack: '总量',
            data: [60, 61, 67, 70, 58, 62, 66, 71, 80, 75, 66, 66, 71, 69, 60, 61, 67, 70, 58, 62, 66, 71, 80, 75, 66, 66, 71]
        },
        {
            name: '血压',
            type: 'line',
            //stack: '总量',
            data: [63, 64, 70, 73, 61, 65, 69, 74, 83, 78, 69, 69, 74, 72, 63, 64, 70, 73, 61, 65, 69, 74, 83, 78, 69, 69, 74]
        }
    ]
};