web-utils-super/base64ToFile.js

前端函数库

/**
 * @desc: 将base64转为Blob类型
 * @param {String} base64
 * @param {String} fileName 文件名
 * @return {Blob}
 */
function base64ToFile(base64, fileName) {
  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)
  } []
  let theBlob = new Blob([u8arr], { type: mime })
  theBlob.lastModifiedDate = new Date()
  theBlob.name = fileName || 'uploadImg'
  theBlob.lastModifiedDate = new Date()
  return theBlob
}

module.exports = base64ToFile