Created
September 1, 2017 13:14
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| /** | |
| * | |
| * Base64 encode / decode | |
| * http://www.webtoolkit.info/ | |
| * | |
| **/ | |
| var Base64 = { | |
| // private property | |
| _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", | |
| // public method for encoding | |
| encode : function (input) { | |
| var output = ""; | |
| var chr1, chr2, chr3, enc1, enc2, enc3, enc4; | |
| var i = 0; | |
| input = Base64._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 + | |
| this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + | |
| this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4); | |
| } | |
| return output; | |
| }, | |
| // public method for decoding | |
| 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 = this._keyStr.indexOf(input.charAt(i++)); | |
| enc2 = this._keyStr.indexOf(input.charAt(i++)); | |
| enc3 = this._keyStr.indexOf(input.charAt(i++)); | |
| enc4 = this._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 = Base64._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; | |
| } | |
| } |
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Интересная и простая возможность кодировки:
var encodedData = window.btoa("Hello, world"); // encode a string
alert(encodedData);
var decodedData = window.atob(encodedData); // decode the string
alert(decodedData);