根据url下载图片解决跨域,导出功能实现

downloadImage (imgsrc, name) {
    
    
      var image = new Image();
      image.setAttribute("crossorigin", "anonymous");
      image.onload = function () {
    
    
        var canvas = document.createElement("canvas");
        canvas.width = image.width;
        canvas.height = image.height;
        var context = canvas.getContext("2d");
        context.drawImage(image, 0, 0, image.width, image.height);
        var url = canvas.toDataURL("image/png"); 
        var a = document.createElement("a");
        var event = new MouseEvent("click"); 
        a.download = name
        a.href = url; 
        a.dispatchEvent(event); 
      };
      image.src = imgsrc + '?time=' + Date.now();  
    }

<el-button size="medium" @click='exportChecked'
           type="primary">导出</el-button>
           
exportList(data).then(res => {
    
    
        let data = new Blob([res.data])
        if ('download' in document.createElement('a')) {
    
    
          let url = window.URL.createObjectURL(data)
          let link = document.createElement('a')
          link.style.display = 'none'
          link.href = url
          link.setAttribute('download', '完成数据.xlsx')
          document.body.appendChild(link)
          link.click()
          document.body.removeChild(link) // 下载完成移除元素
          window.URL.revokeObjectURL(url) // 释放掉blob对象
        } else {
    
     // IE 10+
          window.navigator.msSaveBlob(blob, fileName)
        }
      })