JavaScript base64 加密解密

<!DOCTYPE html>
<html lang="en">
<head>
    <Meta charset="UTF-8">
    <title>www.jb51.net aes.js</title>
</head>

<body>
<script>
  // Create Base64 Objectvar
  Base64 = {
  _keyStr: "ABCDEFGHIJKLMnopQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",encode: function (e) {
    var t = "";
    var n,r,i,s,o,u,a;
    var f = 0;
    e = Base64._utf8_encode(e);
    while (f < e.length) {
      n = e.charCodeAt(f++);
      r = e.charCodeAt(f++);
      i = e.charCodeAt(f++);
      s = n >> 2;
      o = (n & 3) << 4 | r >> 4;
      u = (r & 15) << 2 | i >> 6;
      a = i & 63;
      if (isNaN(r)) {
        u = a = 64
      } else if (isNaN(i)) {
        a = 64
      }
      t = t + this._keyStr.charat(s) + this._keyStr.charat(o) + this._keyStr.charat(u) + this._keyStr.charat(a)
    }
    return t
  },decode: function (e) {
    var t = "";
    var n,i;
    var s,a;
    var f = 0;
    e = e.replace(/[^A-Za-z0-9+/=]/g,"");
    while (f < e.length) {
      s = this._keyStr.indexOf(e.charat(f++));
      o = this._keyStr.indexOf(e.charat(f++));
      u = this._keyStr.indexOf(e.charat(f++));
      a = this._keyStr.indexOf(e.charat(f++));
      n = s << 2 | o >> 4;
      r = (o & 15) << 4 | u >> 2;
      i = (u & 3) << 6 | a;
      t = t + String.fromCharCode(n);
      if (u != 64) {
        t = t + String.fromCharCode(r)
      }
      if (a != 64) {
        t = t + String.fromCharCode(i)
      }
    }
    t = Base64._utf8_decode(t);
    return t
  },_utf8_encode: function (e) {
    e = e.replace(/rn/g,"n");
    var t = "";
    for (var n = 0; n < e.length; n++) {
      var r = e.charCodeAt(n);
      if (r < 128) {
        t += String.fromCharCode(r)
      } else if (r > 127 && r < 2048) {
        t += String.fromCharCode(r >> 6 | 192);
        t += String.fromCharCode(r & 63 | 128)
      } else {
        t += String.fromCharCode(r >> 12 | 224);
        t += String.fromCharCode(r >> 6 & 63 | 128);
        t += String.fromCharCode(r & 63 | 128)
      }
    }
    return t
  },_utf8_decode: function (e) {
    var t = "";
    var n = 0;
    var r = c1 = c2 = 0;
    while (n < e.length) {
      r = e.charCodeAt(n);
      if (r < 128) {
        t += String.fromCharCode(r);
        n++
      } else if (r > 191 && r < 224) {
        c2 = e.charCodeAt(n + 1);
        t += String.fromCharCode((r & 31) << 6 | c2 & 63);
        n += 2
      } else {
        c2 = e.charCodeAt(n + 1);
        c3 = e.charCodeAt(n + 2);
        t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
        n += 3
      }
    }
    return t
  }
}

// Define the string
var string = ‘Hello World!‘;
// Encode the String
var encodedString = Base64.encode(string);
console.log(encodedString); // Outputs: "SGVsbG8gV29ybGQh"
// Decode the String
var decodedString = Base64.decode(encodedString);
console.log(decodedString); // Outputs: "Hello World!"

//这个自定义的Base64对象可以转码的字符也不仅限于latin1字符;
var string = "Hello,ccccc！";
var encodedString = Base64.encode(string);//"SGVsbG8sIOS4reWbve+8gQ=="
console.log(encodedString);
var decodedString = Base64.decode(encodedString);
console.log(decodedString);
console.log("hahahhaha");
</script>

</body>
</html>
参考：
https://www.cnblogs.com/songzhixue/p/11253243.html
https://www.cnblogs.com/chenglee/p/9037265.html
JavaScript base64 加密解密

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