echarts-在现实标题中显示百分比

    series : [{
                name: ‘类型‘,
                type: ‘pie‘,
                radius : ‘55%‘,
                center: [‘50%‘, ‘60%‘],
                data:valuearray,
                itemStyle: {
                    emphasis: {
                        shadowBlur: 10,
                        shadowOffsetX: 0,
                        shadowColor: ‘rgba(0, 0, 0, 0.5)‘
                    },
                    normal:{ 
                        label:{ 
                            show: true, 
                            formatter: ‘{b} : {c} ({d}%)‘ 
                        }, 
                        labelLine :{show:true} 
                    } 
                }
            }
        ]