如何在Vue项目中利用ECharts4Taro3实现数据可视化的动态导出功能

npm install echarts-for-taro3

// 导入ECharts和相关组件
import { ECharts, EChartOption } from 'echarts-for-taro3';

// 引入ECharts4Taro3的样式文件
import 'echarts-for-taro3/components/ec-canvas/style';

<template>
  <view class="chart">
    <ec-canvas ref="canvasRef"
               :ec="ec"
               @init="initChart"
               @touchstart="onTouchStart"
               @touchmove="onTouchMove"
               @touchend="onTouchEnd"
    />
  </view>
</template>

import * as echarts from 'echarts/core';
import { BarChart } from 'echarts/charts';
import {
  GridComponent,
  LegendComponent,
  TooltipComponent
} from 'echarts/components';

export default {
  name: 'Chart',
  components: {},
  data() {
    return {
      ec: {
        lazyLoad: true
      }
    };
  },
  mounted() {
    this.ec = this.$refs.canvasRef.getEc();
    this.initChart();
  },
  methods: {
    initChart() {
      echarts.use([BarChart, GridComponent, LegendComponent, TooltipComponent]);
      const chart = this.ec.init(this.$refs.canvasRef.canvas, null, {
        renderer: 'canvas'
      });

      // 设置图表配置项和数据
      const option = {
        // ...
      };

      // 渲染图表
      chart.setOption(option);
    }
  }
};

<template>
  <view class="chart">
    <!-- ... -->
    <button @click="handleExport">导出</button>
  </view>
</template>

import { saveAsImage } from 'echarts-for-taro3';

export default {
  //...
  methods: {
    //...
    handleExport() {
      // 获取图表实例
      const chart = this.ec.getInstanceByDom(this.$refs.canvasRef.canvas);

      // 导出图表
      saveAsImage(chart, {
        type: 'png', // 导出图片格式，支持：'png', 'jpeg', 'svg', 'pdf'
        name: 'chart', // 导出图片的名称
        pixelRatio: 1 // 导出图片的分辨率，可根据需要调整
      });
    }
  }
};