LinearGradient

color: [  //仪表盘背景颜色渐变
    [1,new echarts.graphic.LinearGradient(0, 0, 1, 0, 
        [
            {
                offset: 0.1,
                color: "#fd2100"
            },
            {
                offset: 0.6,
                color: "#d09f00"
            },
            {
                offset: 1,
                color: "#26fd00"
            }
        ]);
    ]
],

linear

// 线性渐变，前四个参数分别是 x0, y0, x2, y2, 范围从 0 - 1，相当于在图形包围盒中的百分比，如果 globalCoord 为 `true`，则该四个值是绝对的像素位置
color: {
    type: 'linear',
    x: 0,
    y: 0,
    x2: 0,
    y2: 1,
    colorStops: [{
        offset: 0, color: 'red' // 0% 处的颜色
    }, {
        offset: 1, color: 'blue' // 100% 处的颜色
    }],
    global: false // 缺省为 false
}

RadialGradient

color:new echarts.graphic.RadialGradient(0.3, 0.3, 0.8, [{
    offset: 0,
    color: '#f7f8fa'
}, {
    offset: 1,
    color: '#cdd0d5'
}]),

radial

// 径向渐变，前三个参数分别是圆心 x, y 和半径，取值同线性渐变
color: {
    type: 'radial',
    x: 0.5,
    y: 0.5,
    r: 0.5,
    colorStops: [{
        offset: 0, color: 'red' // 0% 处的颜色
    }, {
        offset: 1, color: 'blue' // 100% 处的颜色
    }],
    global: false // 缺省为 false
}

扇形渐变

color: [
    [0.1, 'red'],
    [0.3, new echarts.graphic.LinearGradient(
        0, 1, 0, 0,
        [{
            offset: 0,
            color: 'red'
        }, {
            offset: 0.8,
            color: 'rgb(235,205,6)'
        }]
    )],
    [0.7, 'rgb(235,205,6)'],
    [0.9, new echarts.graphic.LinearGradient(
        0, 1, 0, 0,
        [{
            offset: 0,
            color: 'rgb(13,211,97)'
        }, {
            offset: 0.6,
            color: 'rgb(235,205,6)'
        }]
    )],
    [1, 'rgb(13,211,97)']
],