echarts中渐变色的配置

全图默认背景色

option = {
    backgroundColor: new echarts.graphic.LinearGradient(
                0, 0, 0, 1,
                [{offset: 0, color: '#000'},
                {offset: 0.5, color: '#888'},
                {offset: 1, color: '#ddd'}]
            )
,
}

图表，柱子渐变色

series : [
  {
                name:'使用频率',
                type:'bar',
                barWidth: '30%',
                data:[ 52, 134, 148, 175, 104],
                itemStyle:{
                    barBorderRadius: [5,5,0,0],
                    //新建一个渐变色生成器
                    color: new echarts.graphic.LinearGradient(
                        0, 0, 0, 1,
                        [
                            {offset: 0, color: '#00d4ff'},
                            {offset: 1, color: '#8e3ff4'}
                        ]
                    )
                }
            }
        ]