Y轴数据的自适应量程echarts 折线配置项内容和展示

      option = {
    title: {
        text: '折线图堆叠'
    },
    tooltip: {
        trigger: 'axis'
    },
    legend: {
        data:['邮件营销','联盟广告','视频广告','直接访问','搜索引擎']
    },
    grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    toolbox: {
        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',
        scale:true,
        boundaryGap: ['5%', '5%'],
        //splitNumber:4,
       // min:'auto',
        //max:'auto',
        //minInterval:20
    },
    series: [
        {
            name:'邮件营销',
            type:'line',
            stack: '总量',
           // data:[120, 122, 121, 124, 120, 125, 126]
            
            data:[0.00037, 0.000378, 0.00038, 0.00038, 0.000389, 0.00039, 0.00034]
        }
    ]
};