前端echarts开发或制作区域渐变折线图

    import * as echarts from 'echarts';
    
    var chartDom = document.getElementById('main');
    var myChart = echarts.init(chartDom);
    var option;
    
    option = {
      tooltip: {
    // 鼠标聚焦
    trigger: 'axis',
    axisPointer: {
      type: 'shadow',
      label: {
        backgroundColor: '#6a7985'
      }
    }
      },
      xAxis: {
    type: 'category',
    boundaryGap: false,
    axisTick: {
      show: false //刻度线
    },
    axisLine: {
      show: false //隐藏y轴
    },
    axisLabel: {
      show: false //隐藏刻度值
    },
    dat