---
title: ECharts API
order: 2
---

## ECharts API

```tsx
import React, { useRef } from 'react';
import ReactECharts from 'echarts-for-react';

const Page: React.FC = () => {
  const option = {
    title: {
      text: '漏斗图',
      subtext: '纯属虚构'
    },
    tooltip: {
      trigger: 'item',
      formatter: "{a} <br/>{b} : {c}%"
    },
    toolbox: {
      feature: {
        dataView: {readOnly: false},
        restore: {},
        saveAsImage: {}
      }
    },
    legend: {
      data: ['展现','点击','访问','咨询','订单']
    },
    series: [
      {
        name: '预期',
        type: 'funnel',
        left: '10%',
        width: '80%',
        label: {
          normal: {
            formatter: '{b}预期'
          },
          emphasis: {
            position:'inside',
            formatter: '{b}预期: {c}%'
          }
        },
        labelLine: {
          normal: {
            show: false
          }
        },
        itemStyle: {
          normal: {
            opacity: 0.7
          }
        },
        data: [
          {value: 60, name: '访问'},
          {value: 40, name: '咨询'},
          {value: 20, name: '订单'},
          {value: 80, name: '点击'},
          {value: 100, name: '展现'}
        ]
      },
      {
        name: '实际',
        type: 'funnel',
        left: '10%',
        width: '80%',
        maxSize: '80%',
        label: {
          normal: {
            position: 'inside',
            formatter: '{c}%',
            textStyle: {
              color: '#fff'
            }
          },
          emphasis: {
            position:'inside',
            formatter: '{b}实际: {c}%'
          }
        },
        itemStyle: {
          normal: {
            opacity: 0.5,
            borderColor: '#fff',
            borderWidth: 2
          }
        },
        data: [
          {value: 30, name: '访问'},
          {value: 10, name: '咨询'},
          {value: 5, name: '订单'},
          {value: 50, name: '点击'},
          {value: 80, name: '展现'}
        ]
      }
    ]
  };

  const instance = useRef(null);

  function clickBtn() {
    const base64 = instance.current.getEchartsInstance().getDataURL();

    const img = new Image();
    img.src = base64;
    const newWin = window.open('', '_blank');
    newWin.document.write(img.outerHTML);
  }

  return (
    <>
      <ReactECharts
        ref={instance}
        option={option}
        style={{ height: 400 }}
      />
      <div>
        <button onClick={clickBtn}>click here to get the DataURL of chart.</button>
      </div>
    </>
  );
};

export default Page;
```