前端利用oss图片地址返回url下载zip包

// 首先引入插件
npm install jszip


// 导入项目

import JSZip from 'jszip'


// 利用canvas.toDataURL 转换base64方法下载图片
      downZip() {
　　　　// 测试数据
        let downLoadImageList = ['https://img1.baidu.com/it/u=1112636550,1561836273&fm=253&app=120&size=w931&n=0&f=JPEG&fmt=auto?sec=1669568400&t=a9198393d4bafd6434583994737ec992', 'https://img1.baidu.com/it/u=1112636550,1561836273&fm=253&app=120&size=w931&n=0&f=JPEG&fmt=auto?sec=1669568400&t=a9198393d4bafd6434583994737ec992'];
        if ( downLoadImageList.length === 0 ) {
          this.$message({
            type: 'warning', 
            message: '请选中所要下载的图片'
          });
          return
        }
        let zip = new JSZip();
        let zipTitle = "订单"+ this.info.infoVo.orderNo
        let baseList = [];
        // 要下载图片的url
        for (let i = 0; i < downLoadImageList.length; i++) {
          let image = new Image();
          // 解决跨域 Canvas 污染问题 crossOrigin，后端也要配置
          image.setAttribute("crossOrigin", "anonymous");
          let that = this;
          image.onload = function () {
            let canvas = document.createElement("canvas");
            canvas.width = image.width;
            canvas.height = image.height;
            let context = canvas.getContext("2d");
            context.drawImage(image, 0, 0, image.width, image.height);
            let base64Img = canvas.toDataURL(); // 转换成base64 数据
            canvas.toDataURL("image/png");
            baseList.push(base64Img.substring(22)); // 去掉base64编码前的 data:image/png;base64,  或者  base64Img.replace(/^data:image\/(png|jpg);base64,/, "")
            if (baseList.length === downLoadImageList.length && baseList.length > 0) {
              for (let k = 0; k < baseList.length; k++) {
                zip.file(`图片${Number(k) + 1}.png`, baseList[k], { base64: true });
              }
              zip.generateAsync({ type: "blob" }).then(function (content) {
                FileSaver.saveAs(content, zipTitle + ".zip");
              });
            }
            that.$nextTick(()=>{
              console.log('销毁', i)
              context.clearRect(0, 0, canvas.width, canvas.height);
            })
          };
          image.src = downLoadImageList[i];
        }
      }