echarts使用不显示问题

可以正确实现的代码：

import React, { memo, useRef, useEffect, useState } from 'react';
import { Modal, Row, Col } from 'antd';
import * as echarts from 'echarts';
import './style.less'

function ModalComponent(props) {
  const {isModalVisible, setModal, appCodeDetail} = props;
  const complexContainer = useRef();
  const correlationContainer = useRef();
  const [complexInstance, setComplexInstance] = useState(null);
  const [correlationInstance, setCorrelationInstance] = useState(null);

  useEffect(() => {
    if (complexContainer.current && correlationContainer.current && !complexInstance && !correlationInstance) {
      const complexEchart = echarts.init(complexContainer.current);
      const correlationEchart = echarts.init(correlationContainer.current);
      setComplexInstance(complexEchart);
      setCorrelationInstance(correlationEchart);
      const complexOption = {
        tooltip: {
          trigger: 'axis'
        },
        legend: {
          data: ['complext', 'coveragelines', 'dependency', 'interface'],
          bottom: '3%',
        },
        // grid: {
        //   left: '3%',
        //   right: '4%',
        //   bottom: '3%',
        //   containLabel: true
        // },
        xAxis: {
          type: 'category',
          boundaryGap: false,
          data: appCodeDetail.complexityDatas.xList
        },
        yAxis: {
          type: 'value',
        },
        series: appCodeDetail.complexityDatas.yList
      };
      const correlationOption = {
        tooltip: {
          trigger: 'axis'
        },
        xAxis: {
          type: 'category',
          boundaryGap: false,
          data: appCodeDetail.correlationDatas.xList
        },
        yAxis: {
          type: 'value',
        },
        series: appCodeDetail.correlationDatas.yList
      };
      complexEchart.setOption(complexOption);
      correlationEchart.setOption(correlationOption);
      window.addEventListener("resize", function () {
        complexEchart.resize();
        correlationEchart.resize();
      });
    }
  }, [props])

  return (
    <div>
      <Modal
        title="<AppCode度量详情>"
        width={1200}
        visible={isModalVisible}
        // onOk={handleOk}
        onCancel={() => {
          setModal();
        }}
        footer={null}
      >
        <div>
          <Row>
            <Col span={24} className='title'>{"复杂度(<评分>)"}</Col>
          </Row>
          <Row className='board' gutter={[24,16]}>
            <Col span={8}>
              <span>代码行:</span>
            </Col>
            <Col span={8}>
              <span>圈复杂度:</span>
            </Col>
            <Col span={8}>
              <span>有效方法行:</span>
            </Col>
            <Col span={8}>
              <span>强弱依赖:</span>
            </Col>
            <Col span={8}>
              <span>接口调用:</span>
            </Col>
          </Row>
          <Row>
            <div ref={complexContainer} style={{width: '100%', height: 400}}></div>
          </Row>
          <Row>
            <Col span={24} className='title'>{"相关度(<评分>)"}</Col>
          </Row>
          <Row className='board' gutter={[24,16]}>
            <Col span={24}>
              <span>链路覆盖情况:</span>
            </Col>
            <Col span={24}>
              <span>项目覆盖情况:</span>
            </Col>
          </Row>
          <Row>
            <div ref={correlationContainer} style={{width: '100%', height: 400}}></div>
          </Row>
        </div>
      </Modal>
    </div>
  )
}

export default memo(ModalComponent);

• 容器的初始化对于函数式组件基本都是放在useEffect这个钩子函数中对echarts实例进行初始化。但是初始化要注意如果容器是放在Modal中，初次渲染的时候容器还没渲染，ref.current还为undefined，所以得加if判断
• 容器必须得加高度(height)，不然图显示不出来，这点非常重要，网上很多没说明这点的，都会导致图出不来 另外一个demo代码：

import React, { memo, useRef, useEffect, useState } from 'react';
// import { Modal, Row, Col } from 'antd';
import * as echarts from 'echarts';
// import './style.less'
// import { useEffect } from 'react';

function RefComponent(props) {
  const {isModalVisible, setModal, appCodeDetail} = props;
  const container = useRef();
  const [cnt, setCnt] = useState(0);

  useEffect(() => {
    console.log(container.current, 'current');
    var myChart = echarts.init(container.current, 'default');
    const option = {
      title: {
        text: 'Stacked Line'
      },
      tooltip: {
        trigger: 'axis'
      },
      legend: {
        data: ['Email', 'Union Ads', 'Video Ads', 'Direct', 'Search Engine']
      },
      grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
      },
      toolbox: {
        feature: {
          saveAsImage: {}
        }
      },
      xAxis: {
        type: 'category',
        boundaryGap: false,
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
      },
      yAxis: {
        type: 'value'
      },
      series: [
        {
          name: 'Email',
          type: 'line',
          stack: 'Total',
          data: [120, 132, 101, 134, 90, 230, 210]
        },
        {
          name: 'Union Ads',
          type: 'line',
          stack: 'Total',
          data: [220, 182, 191, 234, 290, 330, 310]
        },
        {
          name: 'Video Ads',
          type: 'line',
          stack: 'Total',
          data: [150, 232, 201, 154, 190, 330, 410]
        },
        {
          name: 'Direct',
          type: 'line',
          stack: 'Total',
          data: [320, 332, 301, 334, 390, 330, 320]
        },
        {
          name: 'Search Engine',
          type: 'line',
          stack: 'Total',
          data: [820, 932, 901, 934, 1290, 1330, 1320]
        }
      ]
    };
    // myChart.setOption(option);
    myChart.setOption(option, true);
    // window.addEventListener("resize", function () {
    //     complexityEchart.resize();
    // });
    // setModal(true);
    // setCnt(cnt + 1);
  }, [props])

  return (
    <div ref={container} style={{height: 400}}></div>
    // <div id="chart-container"></div>
  )
}

export default RefComponent;