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https://yq.aliyun.com/articles/253170?spm=5176.100240.searchblog.9.8tMWIb 参考这篇文章

// Convert a base-64 string to a byte array

  base64ToBytes (base64) {
    // Use browser-native function if it exists
    if (typeof atob === 'function') return this.stringToBytes(window.atob(base64))
    // Remove non-base-64 characters
    base64 = base64.replace(/[^A-Z0-9+/]/ig, '')
    var bytes = []
    for (var i = 0; i < base64.length; i++) {
      switch (i % 4) {
        case 1:
          bytes.push((base64map.indexOf(base64.charAt(i - 1)) << 2) |
            (base64map.indexOf(base64.charAt(i)) >>> 4))
          break
        case 2:
          bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0xF) << 4) |
            (base64map.indexOf(base64.charAt(i)) >>> 2))
          break
        case 3:
          bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0x3) << 6) |
            (base64map.indexOf(base64.charAt(i))))
          break
      }
    }
    return bytes
  },
  stringToBytes (str) {
    var bytes = []
    for (var i = 0; i < str.length; i++) {
      bytes.push(str.charCodeAt(i))
    }
    return bytes
  }

一定要转成base64ToBytes