echarts 折线上写数值_关于ECharts折线图值的显示问题

我这边有两条折线,发现最上面那条折线图的值没有真正显示在y轴上,比如最上面的第一个点,值是30,为什么点要在y轴50上呢?我想显示在y轴30上,该怎么弄呢?

option = {

title: {

text: '折线图堆叠'

},

tooltip: {

trigger: 'axis'

},

legend: {

data:['张三','李四']

},

grid: {

left: '3%',

right: '4%',

bottom: '3%',

containLabel: true

},

toolbox: {

feature: {

saveAsImage: {}

}

},

xAxis: {

type: 'category',

boundaryGap: false,

data: ['1','2','3','4','5','6','7','8','9']

},

yAxis: {

type: 'value'

},

series: [

{

name:'张三',

type:'line',

stack: '总量',

data:[20, 17.6, 12.5, 9.7, 7.9, 6.7, 5.8, 5.1, 4.6]

},

{

name:'李四',

type:'line',

stack: '总量',

data:[30, 14.38, 4.79, 13.01, 15.07, 13.7, 6.85, 2.05, 4.79]

}

]

};


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