boundaryGap 测试echarts 折线配置项内容和展示

      option = {
    title: {
        text: '测试'
    },
    xAxis: {
        type: 'category',
         data: [1,2,3,4]
    },
    yAxis: {
        type: 'value',
        boundaryGap: 5
    },
    series: [{
        name: '模拟数据',
        type: 'line',
        data: [10, 20]
    }]
}