设置echarts线的样式

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.staticfile.org/echarts/4.3.0/echarts.min.js"></script>
</head>

<body>
    <div style="width: 600px;height: 400px;background:#ccc"></div>
    <script>
        var mCharts = echarts.init(document.querySelector('div'))
        var 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'],
                splitLine: {
                    show: true,
                    lineStyle: {
                        color: '#4B0082',//垂直于x轴的线的颜色
                        width: 1, //线的宽度
                    }
                }
            },
            yAxis: {
                type: 'value',
                splitLine: {
                    show: true,
                    lineStyle: {
                        color: '#e8e8e8', //垂直于y轴的线的颜色
                        width: 1,
                        type:'dotted' //'dotted'虚线 'solid'实线
                    }
                }

            },
            series: [{
                    name: '邮件营销',
                    type: 'line',
                    stack: '总量',
                    data: [120, 132, 101, 134, 90, 230, 210]
                },
                {
                    name: '联盟广告',
                    type: 'line',
                    stack: '总量',
                    data: [220, 182, 191, 234, 290, 330, 310]
                },
                {
                    name: '视频广告',
                    type: 'line',
                    stack: '总量',
                    data: [150, 232, 201, 154, 190, 330, 410]
                },
                {
                    name: '直接访问',
                    type: 'line',
                    stack: '总量',
                    data: [320, 332, 301, 334, 390, 330, 320]
                },
                {
                    name: '搜索引擎',
                    type: 'line',
                    stack: '总量',
                    data: [820, 932, 901, 934, 1290, 1330, 1320],
                    itemStyle: {
                        normal: {
                            color: '#f5bf58',
                            label: {
                                show: true,
                                formatter: '{b}：{c}',
                                position: 'top',
                                textStyle: {
                                    fontWeight: '700',
                                    fontSize: '12',
                                    color: '#f5bf58'

                                }
                            },
                            lineStyle: {
                                color: '#f5bf58',
                                width: 4
                            }
                        }
                    },
                }
            ]
        };
        mCharts.setOption(option)
    </script>
</body>
</html>