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base64encode JavaScript怎么操作加密 [复制链接]

xunwai
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  • 中级用户
  • 3
  • 882
  • 2018-02-19
1#
t T
发表于 2018-02-22 20:08 |只看楼主
  1. /**
  2. *
  3. *  Base64 encode / decode
  4. *  http://www.webtoolkit.info/
  5. *
  6. **/
  7. var Base64 = {

  9. // private property
  10. _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

  12. // public method for encoding
  13. encode : function (input) {
  14.     var output = "";
  15.     var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
  16.     var i = 0;

  18.     input = Base64._utf8_encode(input);

  20.     while (i < input.length) {

  22.         chr1 = input.charCodeAt(i++);
  23.         chr2 = input.charCodeAt(i++);
  24.         chr3 = input.charCodeAt(i++);

  26.         enc1 = chr1 >> 2;
  27.         enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
  28.         enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
  29.         enc4 = chr3 & 63;

  31.         if (isNaN(chr2)) {
  32.             enc3 = enc4 = 64;
  33.         } else if (isNaN(chr3)) {
  34.             enc4 = 64;
  35.         }

  37.         output = output +
  38.         this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
  39.         this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

  41.     }

  43.     return output;
  44. },

  46. // public method for decoding
  47. decode : function (input) {
  48.     var output = "";
  49.     var chr1, chr2, chr3;
  50.     var enc1, enc2, enc3, enc4;
  51.     var i = 0;

  53.     input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

  55.     while (i < input.length) {

  57.         enc1 = this._keyStr.indexOf(input.charAt(i++));
  58.         enc2 = this._keyStr.indexOf(input.charAt(i++));
  59.         enc3 = this._keyStr.indexOf(input.charAt(i++));
  60.         enc4 = this._keyStr.indexOf(input.charAt(i++));

  62.         chr1 = (enc1 << 2) | (enc2 >> 4);
  63.         chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
  64.         chr3 = ((enc3 & 3) << 6) | enc4;

  66.         output = output + String.fromCharCode(chr1);

  68.         if (enc3 != 64) {
  69.             output = output + String.fromCharCode(chr2);
  70.         }
  71.         if (enc4 != 64) {
  72.             output = output + String.fromCharCode(chr3);
  73.         }

  75.     }

  77.     output = Base64._utf8_decode(output);

  79.     return output;

  81. },

  83. // private method for UTF-8 encoding
  84. _utf8_encode : function (string) {
  85.     string = string.replace(/\r\n/g,"\n");
  86.     var utftext = "";

  88.     for (var n = 0; n < string.length; n++) {

  90.         var c = string.charCodeAt(n);

  92.         if (c < 128) {
  93.             utftext += String.fromCharCode(c);
  94.         }
  95.         else if((c > 127) && (c < 2048)) {
  96.             utftext += String.fromCharCode((c >> 6) | 192);
  97.             utftext += String.fromCharCode((c & 63) | 128);
  98.         }
  99.         else {
  100.             utftext += String.fromCharCode((c >> 12) | 224);
  101.             utftext += String.fromCharCode(((c >> 6) & 63) | 128);
  102.             utftext += String.fromCharCode((c & 63) | 128);
  103.         }

  105.     }

  107.     return utftext;
  108. },

  110. // private method for UTF-8 decoding
  111. _utf8_decode : function (utftext) {
  112.     var string = "";
  113.     var i = 0;
  114.     var c = c1 = c2 = 0;

  116.     while ( i < utftext.length ) {

  118.         c = utftext.charCodeAt(i);

  120.         if (c < 128) {
  121.             string += String.fromCharCode(c);
  122.             i++;
  123.         }
  124.         else if((c > 191) && (c < 224)) {
  125.             c2 = utftext.charCodeAt(i+1);
  126.             string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
  127.             i += 2;
  128.         }
  129.         else {
  130.             c2 = utftext.charCodeAt(i+1);
  131.             c3 = utftext.charCodeAt(i+2);
  132.             string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
  133.             i += 3;
  134.         }

  136.     }

  138.     return string;
  139. }

  141. }
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怎么使用这个加密？
最后编辑xunwai 最后编辑于 2018-02-22 20:10:18
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老立
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  • 管理员
  • 516
  • 552
  • 2017-01-02
2#
t T
发表于 2018-03-08 08:42 |只看该用户

js写完函数，要做函数外执行一下，比如在后面一行加上text();，请参数红色示例
另外在变量加工里内置有base64加密解密功能，不需要调用js
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