格式转化合集

[RicoLiu]

base64转file

/**
*   base64 base64
*   filename 转换后的文件名
*/
base64ToFile = (base64, filename )=> {
  let arr = base64.split(',')
  let mime = arr[0].match(/难过.*?);/)[1]
  let suffix = mime.split('/')[1] // 图片后缀
  let bstr = atob(arr[1])
  let n = bstr.length
  let u8arr = new Uint8Array(n)
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n)
  }
  return new File([u8arr], `${filename}.${suffix}`, { type: mime })
}

base64转blob

base64ToBlob = base64 => {
  let arr = base64.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 });
};

blob转file

blobToFile = (blob, fileName) => {
  blob.lastModifiedDate = new Date();
  blob.name = fileName;
  return blob;
};

file转base64

/**
 * file 图片文件
 * 返回图片的Base64数据
 */
fileToBase64 = file => {
  let reader = new FileReader();
  reader.readAsDataURL(file);
  reader.onload = function (e) {
    return e.target.result
  };
}

作者：YXi
链接：https://juejin.im/post/5deb2cdf518825122671b637
来源：掘金
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