ECharts分段型视觉映射组件的属性修改

 visualMap: {
            top: 10,
            right: 10,
            pieces: [{
                gt: 0,
                lte: 50,
                label:'深睡',
                color: '#096'
            }, {
                gt: 50,
                lte: 100,
                label:'熟睡',
                color: '#ffde33'
            }, {
                gt: 100,
                lte: 150,
                label:'浅睡',
                color: '#ff9933'
            },  ],
            outOfRange: {
                color: '#999'
            }
        },