base64与二进制互转,保存内容,文件读写:Blob/FileReader/URL/FormData

var str = 'RUNOOB'
var enc = window.btoa(str)
var dec = window.atob(enc)

var res = '编码字符串为: ' + enc + '<br>' + '解码后字符串为: ' + dec

function dataURLtoBlob (dataurl) {
  var arr = dataurl.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
  })
}

function dataURLtoFile (dataurl, filename) {
  // 风格字符串 data:image/png;base64,****”
  var arr = dataurl.split(',')
  // 获取文件类型 data:text/plain;
  var mime = arr[0].match(/:(.*?);/)[1]
  // 解码base-64字符串
  var  bstr = atob(arr[1])
  var n = bstr.length, u8arr = new Uint8Array(n)
  while (n--) {
    u8arr[n] = bstr.charCodeAt(n)
  }
  return new File([u8arr], filename, {type: mime})
}
var blob = dataURLtoBlob('data:text/plain;base64,YWFhYWFhYQ==');

var s = "            

            
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