小编典典

来自DataURL的Blob?

javascript

使用FileReaderreadAsDataURL()我可以将任意的数据到数据的URL。有没有办法Blob使用内置的浏览器API
将数据URL转换回实例?


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2020-05-01

共1个答案

小编典典

用户Matt一年前提出了以下代码如何在javascript中将dataURL转换为文件对象?,这可能对您有帮助

编辑:正如一些评论者所报道的,BlobBuilder已被弃用了一段时间。这是更新的代码:

function dataURItoBlob(dataURI) {
  // convert base64 to raw binary data held in a string
  // doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
  var byteString = atob(dataURI.split(',')[1]);

  // separate out the mime component
  var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]

  // write the bytes of the string to an ArrayBuffer
  var ab = new ArrayBuffer(byteString.length);

  // create a view into the buffer
  var ia = new Uint8Array(ab);

  // set the bytes of the buffer to the correct values
  for (var i = 0; i < byteString.length; i++) {
      ia[i] = byteString.charCodeAt(i);
  }

  // write the ArrayBuffer to a blob, and you're done
  var blob = new Blob([ab], {type: mimeString});
  return blob;

}
2020-05-01