数值遮盖问题echarts 柱状配置项内容和展示

当series的data中部分数值为0时会遮盖其他数值得显示

      app.title = '堆叠条形图';

option = {
    tooltip : {
        trigger: 'axis',
        axisPointer : {            // 坐标轴指示器，坐标轴触发有效
            type : 'shadow'        // 默认为直线，可选为：'line' | 'shadow'
        }
    },
    legend: {
        data: ['直接访问', '邮件营销','联盟广告','视频广告','搜索引擎']
    },
    grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    xAxis:  {
        type: 'value'
    },
    yAxis: {
        type: 'category',
        data: ['周一','周二','周三','周四','周五','周六','周日']
    },
    series: [
        {
            name: '直接访问',
            type: 'bar',
            stack: '总量',
            label: {
                normal: {
                    show: true,
                    position: 'insideRight',
                    formatter:function(params){
                        if(params.value == 0){
                            return ''
                        }else{
                            return params.value
                        }
                    }
                }
            },
            data: [320, 0, 301, 334, 391, 330, 320]
        },
        {
            name: '邮件营销',
            type: 'bar',
            stack: '总量',
            label: {
                normal: {
                    show: true,
                    position: 'insideRight',
                    formatter:function(params){
                        if(params.value == 0){
                            return ''
                        }else{
                            return params.value
                        }
                    }
                }
            },
            data: [120, 0, 101, 134, 90, 0, 210]
        },
        {
            name: '联盟广告',
            type: 'bar',
            stack: '总量',
            label: {
                normal: {
                    show: true,
                    position: 'insideRight',
                    formatter:function(params){
                        if(params.value == 0){
                            return ''
                        }else{
                            return params.value
                        }
                    }
                }
            },
            data: [220, 182, 191, 234, 290, 0, 310]
        },
        {
            name: '视频广告',
            type: 'bar',
            stack: '总量',
            label: {
                normal: {
                    show: true,
                    position: 'insideRight',
                    formatter:function(params){
                        if(params.value == 0){
                            return ''
                        }else{
                            return params.value
                        }
                    }
                }
            },
            data: [150, 212, 201, 154, 0, 330, 410]
        },
        {
            name: '搜索引擎',
            type: 'bar',
            stack: '总量',
            label: {
                normal: {
                    show: true,
                    position: 'insideRight',
                    formatter:function(params){
                        if(params.value == 0){
                            return ''
                        }else{
                            return params.value
                        }
                    }
                }
            },
            data: [820, 0, 901, 934, 1290, 1330, 1320]
        }
    ]
};