feat：统计图片下载

龚焕茏

2024-07-15 572135d41eb6d26aecce24bf7c2d0adb6bc7d0e4

 src/views/answer/dataStatistics.vue

@@ -157,15 +157,18 @@
    });
  },
  methods: {
    downloadUrlFile(url, fileName) {
      // 获取base64图片
      const chartImgUrl = this.myChart.getDataURL({
          pixelRatio: 2,
          backgroundColor: '#fff'
      })
      console.log(chartImgUrl)
      // 下载base64图片
      this.downloadUrlFile(chartImgUrl, 'ECharts 2倍图')
    downloadUrlFile() {
      var fileName = this.queryParam.name + '.png';
      var canvasElement  = document.getElementsByTagName('canvas')[0];
      var MIME_TYPE = "image/png";
      var imgURL = canvasElement.toDataURL(MIME_TYPE);
      var dlLink = document.createElement('a');
      dlLink.download = fileName;
      dlLink.href = imgURL;
      dlLink.dataset.downloadurl = [MIME_TYPE, dlLink.download, dlLink.href].join(':');
      document.body.appendChild(dlLink);
      dlLink.click();
      document.body.removeChild(dlLink);
    },
    handleExport(){
      let that = this