Echart 调用工具栏下载图片

    chartExport() {
      const chartImgUrl = this.myChart.getDataURL({
        pixelRatio: 2,
        backgroundColor: "#fff",
      });
      window.console.log(chartImgUrl);
      this.downloadBase64Image(chartImgUrl, "echar");
    },
    downloadBase64Image(base64, fileName) {
      // 创建一个虚拟的a标签
      let link = document.createElement("a");
      link.href = base64;
      link.download = fileName;

      // 触发点击事件进行下载
      link.click();
      // 下载完成后删除a标签
      setTimeout(function () {
        document.body.removeChild(link);
      }, 100);
    },