关于前端:Echarts-饼图中间添加文字titlegraphic

// 指定图表的配置项和数据

    var option = {        tooltip: {            trigger: 'item',            formatter: "{a} <br/>{b}: {c} ({d}%)"        },        color:["#27D9C8","#D8D8D8"],        title:{            text:"80%",            left:"center",            top:"50%",            textStyle:{                color:"#27D9C8",                fontSize:36,                align:"center"            }        },        graphic:{            type:"text",            left:"center",            top:"40%",            style:{                text:"静止达标率",                textAlign:"center",                fill:"#333",                fontSize:20,                fontWeight:700            }        },        series: [            {                name: '静止状况',                type: 'pie',                radius: ['65%', '70%'],                avoidLabelOverlap: false,                label: {                    normal: {                        show: false,                        position: 'center'                    },                                   },                                data: [                    { value: 80, name: '已实现' },                    { value: 20, name: '未实现' },                                   ]            }        ]    };