echat折线图最大值最小值出不来，也不报错

    series: [
        {
            name:'温度',
            type:'line',
            data:value,
            markPoint: {
                data: [
                    {type: 'max', name: '最大值'},
                    {type: 'min', name: '最小值'}
                ]
            },
            markLine: {
                data: [
                    {type: 'average', name: '平均值'}
                ]
            }
        }
                这是我的代码，运行结果如下，

option = {
xAxis: {
type: 'category',
data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
},
yAxis: {
type: 'value'
},
series: [{
data: [820, 932, 901, 934, 1290, 1330, 1320],
type: 'line',
markPoint: {
data: [
{type: 'max', name: '最大值'},
{type: 'min', name: '最小值'}
]
},
markLine: {
data: [
{type: 'average', name: '平均值'}
]
}
}]

};

option = {
xAxis: {
type: 'category',
data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
},
yAxis: {
type: 'value'
},
series: [{
data: [820, 932, 901, 934, 1290, 1330, 1320],
type: 'line',
markPoint: {
data: [
{type: 'max', name: '最大值'},
{type: 'min', name: '最小值'}
]
},
markLine: {
data: [
{type: 'average', name: '平均值'}
]
}
}]

};

option = {
xAxis: {
type: 'category',
data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
},
yAxis: {
type: 'value'
},
series: [{
data: [820, 932, 901, 934, 1290, 1330, 1320],
type: 'line',
markPoint: {
data: [
{type: 'max', name: '最大值'},
{type: 'min', name: '最小值'}
]
},
markLine: {
data: [
{type: 'average', name: '平均值'}
]
}
}]

};

  markPoint : {
                            symbolSize: 20,       // 标注大小，半宽（半径）参数，当图形为方向或菱形则总宽度为symbolSize * 2
                            itemStyle: {
                                normal: {
                                    borderColor: '#1e90ff',
                                    borderWidth: 1,            // 标注边线线宽，单位px，默认为1
                                    label: {
                                        show: false
                                    }
                                },
                                emphasis: {
                                    borderColor: '#1e90ff',
                                    borderWidth: 5,
                                    label: {
                                        show: false
                                    }
                                }
                            },
                            effect : {
                                show: true,
                                shadowBlur : 0
                            },
                            data : [
                                {name: "最小值", value: 9},
                                {name: "最大值", value: 12},
                            ]
                        },