echarts 饼图在中间显示百分比

echarts饼图在中间显示百分比，使用graphic

setEchartOption(val) {const seriesData = [{ value: 1048, name: '完成值' },{ value: 735, name: '目标值' }]const option = {grid: {containLabel: true},tooltip: {trigger: 'item'},color: ['#74A0FA', '#73DEB3'],series: [{type: 'pie',radius: ['50%', '80%'],avoidLabelOverlap: false,label: {show: false,position: 'center'},labelLine: {show: false},data: seriesData}],// 绘制中间的百分比graphic: {type: 'text',left: 'center',top: 'center',style: {text: Math.round((seriesData[0].value / seriesData[1].value) * 100) + '%',textAlign: 'center',fill: '#666666',fontSize: 20}}}this[`chart${val}`].setOption(option)
}