react项目中引入echarts图表

一、在一般html页面使用

1.在已有项目的终端输入进行安装
npm install echarts --save
2.在import里面输入
import echarts from 'echarts/lib/echarts';
import 'echarts/lib/chart/bar';
import 'echarts/lib/component/tooltip';
import 'echarts/lib/component/title';
来引用
3.用这个套用模板，option里面的内容可以在echarts官网的实例里面去复制粘贴

<div id="main" style="width: 600px;height:400px;"></div>
var myChart = echarts.init(document.getElementById('main'));
        var option =（{
           title: {
            text: 'ECharts 入门示例'
        },
        tooltip: {},
        legend: {
            data:['销量']
        },
        xAxis: {
            data: ["衬衫","羊毛衫","雪纺衫","裤子","高跟鞋","袜子"]
        },
        yAxis: {},
        series: [{
            name: '销量',
            type: 'bar',
            data: [5, 20, 36, 10, 10, 20]
        }]
    });
        };
        myChart.setOption(option);

问题：如果在第一步操作之后运行报错的话，可以运行一次npm install

二、在react项目的函数式组件里使用

import echarts from 'echarts/lib/echarts';
import 'echarts/lib/component/tooltip';
import 'echarts/lib/component/title';
import 'echarts/lib/component/legend'
import 'echarts/lib/chart/pie';
const Echartstest = (props) => {
  let [main, setMain] = useState('')
  const option = {
    title: {
      text: '某站点用户访问来源',
      subtext: '纯属虚构',
      left: 'center'
    },
    tooltip: {
      trigger: 'item',
      formatter: '{a} 
{b} : {c} ({d}%)'
    },
    legend: {
      orient: 'vertical',
      left: 'left',
      data: ['直接访问', '邮件营销', '联盟广告', '视频广告', '搜索引擎']
    },
    series: [
      {
        name: '访问来源',
        type: 'pie',
        radius: '55%',
        center: ['50%', '60%'],
        data: [
          { value: 335, name: '直接访问' },
          { value: 310, name: '邮件营销' },
          { value: 234, name: '联盟广告' },
          { value: 135, name: '视频广告' },
          { value: 1548, name: '搜索引擎' }
        ],
        emphasis: {
          itemStyle: {
            shadowBlur: 10,
            shadowOffsetX: 0,
            shadowColor: 'rgba(0, 0, 0, 0.5)'
          }
        }
      }
    ]
  };
  useEffect(() => {
    var node = document.getElementById('main')
    setMain(node)
  }, [])
  if (main !== "") {
    var myChart = echarts.init(main);
    myChart.setOption(option);
  }
  return (
    <div style={{ height: "500px", width: "600px" }} id="main"></div>
  )
}
export default Echartstest;

效果如下：