scatter散点图的标注markPoint不显示，看起来像是无效echarts scatter配置项内容和展示

修改过symbol，对于结果也没有任何影响，代码不知道为什么有错，有可能是数据的原因，本地是可以正常显示的，只是标注不显示

      var uploadedDataURL = "/asset/get/s/data-1532317091317-SyjipazEm.xlsx";

option = {
    animation: false,
    legend: {
        data: ['scatter']
    },
    toolbox: {
        feature: {
            dataView: {},
            dataZoom: {
                show: true,
                yAxisIndex: 0
            },
            restore: {
                show: true
            },
            saveAsImage: {}
        }
    },
    tooltip: {
        axisPointer: {
            show: true,
            type: 'cross',

        }
    },

    xAxis: {
        type: 'value',
        min: 'dataMin',
        max: 'dataMax',
        splitLine: {
            show: true
        }
    },

    yAxis: {
        type: 'value',
        min: 'dataMin',
        max: 'dataMax',
        splitLine: {
            show: true
        }
    },

    visualMap: {
        min: cmin,
        max: cmax,
        calculable: true,
        realtime: false,
        splitNumber: 500,
        inRange: {
            //color: ['#313695', '#4575b4', '#74add1', '#abd9e9', '#e0f3f8', '#ffffbf', '#fee090', '#fdae61', '#f46d43', '#d73027', '#a50026']
            color: ['#0000FF', '#0088FF', '#FFFF00', '#FF8800', '#FF0000']
        }
    },

    dataZoom: [{
            show: true,
            xAxisIndex: [0],
            filterMode: 'empty',
            start: 0,
            end: 100
        },
        {
            show: true,
            yAxisIndex: [0],
            filterMode: 'empty',
            start: 0,
            end: 100
        },
        {
            type: 'inside',
            xAxisIndex: [0],
            filterMode: 'empty',
            start: 0,
            end: 100
        },
        {
            type: 'inside',
            yAxisIndex: [0],
            filterMode: 'empty',
            start: 0,
            end: 100
        }
    ],


    series: [{
            name: 'scatter',
            type: 'scatter',
            itemStyle: {
                normal: {
                    opacity: 0.8,
                }
            },
            symbolSize: 8,
            //data: data1
            data: [
                [20, 30, 1000],
                [50, 60, 2000],
                [80, 90, 3000],
                [-30, -90, 6050],
            ],

            markPoint: {
                symbol: 'star',
                symbolSize: 30,
                itemStyle: {
                    label: {
                        show: true,

                    },
                },
                data: [
                    //{type:'min', name:'最小值'},
                    //20, 70,0
                    //{name:'zuobiao',x:50,y:50},
                    {
                        name: '最大值',
                        type: 'max'
                    },
                    {
                        name: '某个坐标',
                        coord: [10, 20]
                    },
                    {
                        name: '固定 x 像素位置',
                        yAxis: 10,
                        x: '90%'
                    },
                    {
                        name: '某个屏幕坐标',
                        xAxis: 10,
                        yAxis: 10
                    },
                    {
                        name: '某个屏幕坐标',
                        x: 10,
                        y: 10
                    }
                ], //

            },

        }
    ]
};