react项目怎么增加echarts饼图

npm install echarts --save

import echarts from 'echarts/lib/echarts';
import  'echarts/lib/chart/pie';  //饼状图
import  'echarts/lib/component/tooltip';
import  'echarts/lib/component/title';
import  'echarts/lib/component/legend'
import  'echarts/lib/component/markPoint'

componentDidMount() {
        //环形图百分比
        var huan_val = document.getElementsByClassName("huan")[0];
        var chart = echarts.init(huan_val);
        let option = {
            color: ["#f8e367", "#99dfff", "#58c0f0", "#5ea6ff", "#ff9e48", "#bcbcbc"],
            series: [{
                name: "驾驶分析",
                type: "pie",
                radius: ['60%', '80%'],
                avoidLabelOverlap: false,
                label: {
                    normal: {
                        show: false,
                        position: 'center'
                    },
                    emphasis: {
                        show: true,
                        textStyle: {
                            fontSize: '30',
                            fontWeight: 'bold'
                        }
                    }
                },
                labelLine: {
                    normal: {
                        show: false
                    }
                },
                data: [{
                    value: 33,
                    name: '慢速'
                }, {
                    value: 26,
                    name: '低速'
                }, {
                    value: 6,
                    name: '中速'
                }, {
                    value: 2,
                    name: '高速'
                }, {
                    value: 3,
                    name: '超速'
                }, {
                    value: 30,
                    name: '怠速'
                }]
            }]
        };
        chart.setOption(option);
    }

render(){
	return(
        <div className="huan"></div>
	)}