我想把-10，-15均線也顯示出來(lái)，請(qǐng)問(wèn)這個(gè)該怎么弄呢？

option = {
        tooltip: {
            trigger: 'axis'
        },
        legend: {
            data:['最高氣溫','最低氣溫']
        },
        toolbox: {
            show: true,
            feature: {
                saveAsImage: {}
            }
        },
        xAxis:  {
            type: 'category',
            boundaryGap: false,
            data: ['周一','周二','周三','周四','周五','周六','周日']
        },
        yAxis: {
            type: 'value',
            axisLabel: {
                formatter: '{value}'
            }
        },
        series: [
            {
                name:'最高氣溫',
                type:'line',
                data:[25, 18, 10, 7, 5, 3, 35],
                markLine: {
                    silent: true,
                    data: [
                        {name: 'Y 軸值為 100 的水平線',yAxis: 25,label: {
                            normal: {
                                formatter: '25'
                            }
                        }},
                        {name: 'Y 軸值為 100 的水平線',yAxis: 20,label: {
                            normal: {
                                formatter: '20'
                            }
                        }},
                        {name: 'Y 軸平均水平線',yAxis: 2,label: {
                            normal: {
                                formatter: '2'
                            }
                        }},
                        {name: 'Y 軸值為 100 的水平線',yAxis: -10,label: {
                            normal: {
                                formatter: '-10'
                            }
                        }},
                        {name: 'Y 軸值為 100 的水平線',yAxis: -15,label: {
                            normal: {
                                formatter: '-15'
                            }
                        }},
                    ]
                }
            },
        ]
    };