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AngularJS實現(xiàn)的base64編碼與解碼功能示例

更新時間：2018年05月17日 10:27:34 作者：Mars-xq

這篇文章主要介紹了AngularJS實現(xiàn)的base64編碼與解碼功能,結(jié)合實例形式分析了AngularJS字符串base64編碼與解碼操作相關(guān)實現(xiàn)技巧,需要的朋友可以參考下

本文實例講述了AngularJS實現(xiàn)的base64編碼與解碼功能。分享給大家供大家參考，具體如下：

<!DOCTYPE HTML>
<html>
<head>
 <meta charset="utf-8">
 <title>base64加密</title>
 <script src="http://apps.bdimg.com/libs/angular.js/1.4.6/angular.min.js"></script>
 <script>
  function Base64() {
   // private property
   _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
   // public method for encoding
   this.encode = function (input) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;
    input = _utf8_encode(input);
    while (i < input.length) {
     chr1 = input.charCodeAt(i++);
     chr2 = input.charCodeAt(i++);
     chr3 = input.charCodeAt(i++);
     enc1 = chr1 >> 2;
     enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
     enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
     enc4 = chr3 & 63;
     if (isNaN(chr2)) {
      enc3 = enc4 = 64;
     } else if (isNaN(chr3)) {
      enc4 = 64;
     }
     output = output +
       _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +
       _keyStr.charAt(enc3) + _keyStr.charAt(enc4);
    }
    return output;
   }
   // public method for decoding
   this.decode = function (input) {
    var output = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;
    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
    while (i < input.length) {
     enc1 = _keyStr.indexOf(input.charAt(i++));
     enc2 = _keyStr.indexOf(input.charAt(i++));
     enc3 = _keyStr.indexOf(input.charAt(i++));
     enc4 = _keyStr.indexOf(input.charAt(i++));
     chr1 = (enc1 << 2) | (enc2 >> 4);
     chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
     chr3 = ((enc3 & 3) << 6) | enc4;
     output = output + String.fromCharCode(chr1);
     if (enc3 != 64) {
      output = output + String.fromCharCode(chr2);
     }
     if (enc4 != 64) {
      output = output + String.fromCharCode(chr3);
     }
    }
    output = _utf8_decode(output);
    return output;
   }
   // private method for UTF-8 encoding
   _utf8_encode = function (string) {
    string = string.replace(/\r\n/g, "\n");
    var utftext = "";
    for (var n = 0; n < string.length; n++) {
     var c = string.charCodeAt(n);
     if (c < 128) {
      utftext += String.fromCharCode(c);
     } else if ((c > 127) && (c < 2048)) {
      utftext += String.fromCharCode((c >> 6) | 192);
      utftext += String.fromCharCode((c & 63) | 128);
     } else {
      utftext += String.fromCharCode((c >> 12) | 224);
      utftext += String.fromCharCode(((c >> 6) & 63) | 128);
      utftext += String.fromCharCode((c & 63) | 128);
     }
    }
    return utftext;
   }
   // private method for UTF-8 decoding
   _utf8_decode = function (utftext) {
    var string = "";
    var i = 0;
    var c = c1 = c2 = 0;
    while (i < utftext.length) {
     c = utftext.charCodeAt(i);
     if (c < 128) {
      string += String.fromCharCode(c);
      i++;
     } else if ((c > 191) && (c < 224)) {
      c2 = utftext.charCodeAt(i + 1);
      string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
      i += 2;
     } else {
      c2 = utftext.charCodeAt(i + 1);
      c3 = utftext.charCodeAt(i + 2);
      string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
      i += 3;
     }
    }
    return string;
   }
  }
 </script>
</head>
<body>
<p id="p1">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</p>
<script>
 var b = new Base64();
 str = document.getElementById("p1").innerHTML;
 //解密
 str = b.decode(str);
 document.getElementById("p1").innerHTML = str;
</script>
</body>
</html>

運行效果如下：