echarts 标题 添加●

        label: {
            normal: {
                formatter: params => {
                    return (
                        '{icon|●}{name|' + params.name + '}{value|' +
                        formatNumber(params.value) + '}'
                    );
                },
                padding: [0 , -100, 25, -100],
                rich: {
                    icon: {
                        fontSize: 16
                    },
                    name: {
                        fontSize: 14,
                        padding: [0, 10, 0, 4],
                        color: '#666666'
                    },
                    value: {
                        fontSize: 18,
                        fontWeight: 'bold',
                        color: '#333333'
                    }
                }
            }
        },