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      });    }  }};