堆叠区域图echarts 折线配置项内容和展示

多个y轴不能全部放大缩小，只能放大缩小第一个y轴 (#4629)

      option = {
    title: {
        text: '堆叠区域图'
    },
    tooltip : {
        trigger: 'axis',
        axisPointer:{type:'line'},

    },
    legend: {
        data:['邮件营销','联盟广告','视频广告','直接访问','搜索引擎']
    },
    toolbox: {
        
        feature: {
            restore:{},
            saveAsImage: {},
            dataZoom:{
            show : true,
            title : {
                zoom :'放大',
                back : '缩小'
            }
        }
        }
    },
    grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    xAxis : [
        {
            type : 'category',
            boundaryGap : false,
            data : ['周一','周二','周三','周四','周五','周六','周日']
        }
    ],
    yAxis : [
        {
            type : 'value'
        },{
            type : 'value'
        }
        
    ],
    series : [
        {
            name:'邮件营销',
            yAxisIndex:0,
            type:'line',
            stack: '总量',
       
            data:[120, 132, 101, 134, 90, 230, 210]
        },
        {
            name:'联盟广告',
            yAxisIndex:1,
            type:'line',
            stack: '总量',
           
            data:[220, 182, 191, 234, 290, 330, 310]
        }
        
    ]
};