方法封装

export default function base64ToBlob(base64Data) {
  var byteString
  if (base64Data.split(',')[0].indexOf('base64') >= 0) {
    byteString = atob(base64Data.split(',')[1])
  } else {
    byteString = unescape(base64Data.split(',')[1])
  }
  var mimeString = base64Data.split(',')[0].split(':')[1].split(';')[0]
  var ia = new Uint8Array(byteString.length)
  for (var i = 0; i < byteString.length; i++) {
    ia[i] = byteString.charCodeAt(i)
  }
  return new Blob([ia], {
    type: mimeString
  });
}

方法使用

let signImg = base64ToBlob(img);
let formData = new FormData();
formData.append("file", signImg);

使用实例

vue base64图片上传到腾讯云cos