echarts center配置项内容和展示

      option = {
    "legend": {
        "orient": "vertical",
        "x": "right",
        "y": "center",
        "itemGap": 15,
        "padding": [
            15,
            70,
            15,
            8
        ],
        "data": [
            "基础DDoS防护（5Gbps）",
            "高级DDoS防护（20Gbps）"
        ],
        "show": true,
        "textStyle": {
            "fontFamily": "微软雅黑"
        }
    },
    graphic: [{
        type: 'ring',
        shape: {
            cx: echarts.number.parsePercent('25%', myChart.getWidth()),
            cy: echarts.number.parsePercent('50%', myChart.getHeight()),
            r: echarts.number.parsePercent(
                '40%', Math.min(myChart.getWidth(), myChart.getHeight()) / 2
            ),
            r0: echarts.number.parsePercent(
                '72%', Math.min(myChart.getWidth(), myChart.getHeight()) / 2
            )
        },
        style: {
            fill: 'none',
            stroke: '#000'
        }
    }],
    "series": [{
        "type": "pie",
        "center": [
            "25%",
            "50%"
        ],
        "radius": [
            "42%",
            "70%"
        ],
        "itemStyle": {
            "normal": {
                "label": {
                    position: 'center',
                    "show": false
                },
                "labelLine": {
                    "show": false
                }
            },
            "emphasis": {
                "label": {
                    "show": true,
                    "formatter": " ",
                    "position": "center",
                    "textStyle": {
                        "fontSize": "13",
                        "fontWeight": "400",
                        "color": "#333",
                        "fontFamily": "微软雅黑"
                    }
                }
            }
        },
        "data": [{
            "name": "基础DDoS防护（5Gbps）",
            "value": '-'
        }, {
            "name": "高级DDoS防护（20Gbps）",
            "value": '-'
        }]
    }],
    "animation": false
}