图例的展示模型。。。echarts 折线配置项内容和展示

就仅仅是图例的显示问题

      option = {
    title: {
        text: '图例的展示模型。。。',
        subtext:'木可'
        
    },
    tooltip: {
        trigger: 'axis'
    },
    legend: {
        data:['邮件营销','联盟广告qweqwe','\n','广告A','直接访问','搜索引擎'],
       formatter: function (name) {
            if(name.length<4){
                var str="";
               for(var i=0;i<(4-name.length);i++){
                str+="　 ";
                }
                return name+str
            }else if(name.length>4){
                
                name = name.substring(0,3);
                name+="...";
                return name
            }else{
                 return name
            }
            
        }
    },
    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'
    },
    series: [
        {
            name:'邮件营销',
            type:'line',
            stack: '总量',
            data:[120, 132, 101, 134, 90, 230, 210]
        },
        {
            name:'联盟广告qweqwe',
            type:'line',
            stack: '总量',
            data:[220, 182, 191, 234, 290, 330, 310]
        },
        {
            name:'广告A',
            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]
        }
    ]
};