Base64转换二进制文件对象 Blob/Base64转换 File 对象

function convertBase64UrlToBlob(urlData) {
  var arr = dataurl.split(','),//去掉url的头,并转换为byte
  type = arr[0].match(/:(.*?);/)[1],
  fileExt = mime.split('/')[1],
  bstr = atob(arr[1]),
  n = bstr.length,
  u8arr = new Uint8Array(n);
  while(n--) {
    u8arr[n] = bstr.charCodeAt(n);
  }
  return new Blob([ab], { type: type}); 
}
  function convertBase64UrlToFile(urlData) {
	var arr = dataurl.split(','),
	type= arr[0].match(/:(.*?);/)[1],
	fileExt = mime.split('/')[1],
	bstr = atob(arr[1]),
	n = bstr.length,
	u8arr = new Uint8Array(n);
	while(n--) {
		u8arr[n] = bstr.charCodeAt(n);
	}
	return new File([u8arr],"fileName."+fileExt,{type:type});
  }

  

转载于:https://www.cnblogs.com/xiaomingSun/p/7068769.html

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