이미지 다운

function dataURLtoBlob(dataurl) {
  var arr = dataurl.split(','),
    mime = arr[0].match(/:(.*?);/)[1],
    bstr = atob(arr[1]),
    n = bstr.length,
    u8arr = new Uint8Array(n);
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n);
  }
  return new Blob([u8arr], {
    type: mime,
  });
}

// eslint-disable-next-line no-unused-vars
function downloadImg(imgSrc) {
  var image = new Image();
  image.crossOrigin = 'anonymous';
  image.src = imgSrc;
  var fileName = image.src.split('/').pop();
  image.onload = function () {
    var canvas = document.createElement('canvas');
    canvas.width = this.width;
    canvas.height = this.height;
    canvas.getContext('2d').drawImage(this, 0, 0);
    if (typeof window.navigator.msSaveBlob !== 'undefined') {
      window.navigator.msSaveBlob(dataURLtoBlob(canvas.toDataURL()), fileName);
    } else {
      var link = document.createElement('a');
      link.href = canvas.toDataURL();
      link.download = fileName;
      link.click();
    }
  };
}