option = {
    tooltip: {},
    backgroundColor: '#fff',
    visualMap: {
        show: false,
        dimension: 2,
        min: -1,
        max: 1,
        inRange: {
            color: ['#313695', '#4575b4', '#74add1', '#abd9e9', '#e0f3f8', '#ffffbf', '#fee090', '#fdae61', '#f46d43', '#d73027', '#a50026']
        }
    },
    xAxis3D: {
        type: 'value'
    },
    yAxis3D: {
        type: 'value'
    },
    zAxis3D: {
        type: 'value'
    },
    grid3D: {
        viewControl: {
            // projection: 'orthographic'
        }
    },
    series: [{
        type: 'surface',
        wireframe: {
            // show: false
        },
        equation: {
            x: {
                step: 0.05
            },
            y: {
                step: 0.05
            },
            z: function (x, y) {
                if (Math.abs(x) < 0.1 && Math.abs(y) < 0.1) {
                    return '-';
                }
                return Math.sin(x * Math.PI) * Math.sin(y * Math.PI);
            }
        }
    }]
}