echarts 双y轴渐变色进度条

var index = 0;
var colorList = ['#f36c6c', '#e6cf4e', '#20d180', '#0093ff'];
option = {
    backgroundColor:"#17326b",
    grid:{
        left:"40",
        top:"10",
        right:"30",
        bottom:"10",
        containLabel:true
    },
    xAxis: {
        show:false
    },
    yAxis:[
       {
            type: 'category',
            axisTick:{show:false},
            axisLine:{show:false},
            axisLabel:{
                color:"black",
                fontSize:14,
                textStyle: {
                      color: '#fff'
                },
                rich: {
                    a1: {
                        color:  colorList[0],
                         20,
                        height: 10,
                        align: 'center',
                    },
                    a2: {
                        color: colorList[1],
                           20,
                        height: 10,
                        align: 'center',
                    },
                    a3: {
                        color: colorList[2],
                          20,
                        height: 10,
                        align: 'center',
                    },
                    b: {
                        color:colorList[3],
                         20,
                        height: 10,
                        align: 'center',
                    }
                },
                formatter: function(params) {
                    if (index == 10) {
                        index = 0;
                    }
                    index++;
                    if (index - 1 < 3) {
                        return [
                            '{a' + index + '|' + index + '}' + '  ' + params
                        ].join('
')
                    } else {
                        return [
                            '{b|' + index + '}' + '  ' + params
                        ].join('
')
                    }
                }
            },
            data:["苹果","香蕉","橘子","梨子","葡萄","柿子","草莓","蓝莓","柚子","橙子"],
            inverse:true
        },
         {
            type: 'category',
            axisTick:{show:false},
            axisLine:{show:false},
            axisLabel:{
                color:"black",
                fontSize:14,
                textStyle: {
                      color: '#fff'
                }
            },
            data:[702,350,800,600,550,700,600,800,900,600],
            inverse:true
        }
    ],
    series: [
      {
        name:"条",
        type:"bar",
        barWidth:19,
        data:[80,40,60,10,80,50,70,80,90,60],
        barCategoryGap:20,
        itemStyle:{
            normal:{
                barBorderRadius:10,
                color: new echarts.graphic.LinearGradient(0, 0, 1, 0, [{
                  offset: 0,
                  color: '#22b6ed'
                }, {
                  offset: 1,
                  color: '#3fE279'
                }]),
            }
        },
        zlevel:1
        
      },{
          name:"进度条背景",
          type:"bar",
          barGap:"-100%",
          barWidth:19,
          data:[100,100,100,100,100,100,100,100,100,100],
          color:"#2e5384",
          itemStyle:{
              normal:{
                  barBorderRadius:10
              }
          },
      }
    ]
};