jquerybase64.js插件使用

官方文档地址&＃xff1a;https://github.com/yckart/jquery.base64.js

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/*!
* jquery.base64.js 0.1 - https://github.com/yckart/jquery.base64.js
* Makes Base64 en & -decoding simpler as it is.
*
* Based upon: https://gist.github.com/Yaffle/1284012
*
* Copyright (c) 2012 Yannick Albert (http://yckart.com)
* Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php).
* 2013/02/10
**/
;(function($) {

var b64 &＃61; "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789&＃43;/",
a256 &＃61; &＃39;&＃39;,
r64 &＃61; [256],
r256 &＃61; [256],
i &＃61; 0;

var UTF8 &＃61; {

/**
* Encode multi-byte Unicode string into utf-8 multiple single-byte characters
* (BMP / basic multilingual plane only)
*
* Chars in range U&＃43;0080 - U&＃43;07FF are encoded in 2 chars, U&＃43;0800 - U&＃43;FFFF in 3 chars
*
* &＃64;param {String} strUni Unicode string to be encoded as UTF-8
* &＃64;returns {String} encoded string
*/
encode: function(strUni) {
// use regular expressions & String.replace callback function for better efficiency
// than procedural approaches
var strUtf &＃61; strUni.replace(/[\u0080-\u07ff]/g, // U&＃43;0080 - U&＃43;07FF &＃61;> 2 bytes 110yyyyy, 10zzzzzz
function(c) {
var cc &＃61; c.charCodeAt(0);
return String.fromCharCode(0xc0 | cc >> 6, 0x80 | cc & 0x3f);
})
.replace(/[\u0800-\uffff]/g, // U&＃43;0800 - U&＃43;FFFF &＃61;> 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz
function(c) {
var cc &＃61; c.charCodeAt(0);
return String.fromCharCode(0xe0 | cc >> 12, 0x80 | cc >> 6 & 0x3F, 0x80 | cc & 0x3f);
});
return strUtf;
},

/**
* Decode utf-8 encoded string back into multi-byte Unicode characters
*
* &＃64;param {String} strUtf UTF-8 string to be decoded back to Unicode
* &＃64;returns {String} decoded string
*/
decode: function(strUtf) {
// note: decode 3-byte chars first as decoded 2-byte strings could appear to be 3-byte char!
var strUni &＃61; strUtf.replace(/[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, // 3-byte chars
function(c) { // (note parentheses for precence)
var cc &＃61; ((c.charCodeAt(0) & 0x0f) <<12) | ((c.charCodeAt(1) & 0x3f) <<6) | (c.charCodeAt(2) & 0x3f);
return String.fromCharCode(cc);
})
.replace(/[\u00c0-\u00df][\u0080-\u00bf]/g, // 2-byte chars
function(c) { // (note parentheses for precence)
var cc &＃61; (c.charCodeAt(0) & 0x1f) <<6 | c.charCodeAt(1) & 0x3f;
return String.fromCharCode(cc);
});
return strUni;
}
};

while(i <256) {
var c &＃61; String.fromCharCode(i);
a256 &＃43;&＃61; c;
r256[i] &＃61; i;
r64[i] &＃61; b64.indexOf(c);
&＃43;&＃43;i;
}

function code(s, discard, alpha, beta, w1, w2) {
s &＃61; String(s);
var buffer &＃61; 0,
i &＃61; 0,
length &＃61; s.length,
result &＃61; &＃39;&＃39;,
bitsInBuffer &＃61; 0;

while(i var c &＃61; s.charCodeAt(i);
c &＃61; c <256 ? alpha[c] : -1;

buffer &＃61; (buffer < bitsInBuffer &＃43;&＃61; w1;

while(bitsInBuffer >&＃61; w2) {
bitsInBuffer -&＃61; w2;
var tmp &＃61; buffer >> bitsInBuffer;
result &＃43;&＃61; beta.charAt(tmp);
buffer ^&＃61; tmp < }
&＃43;&＃43;i;
}
if(!discard && bitsInBuffer > 0) result &＃43;&＃61; beta.charAt(buffer <<(w2 - bitsInBuffer));
return result;
}

var Plugin &＃61; $.base64 &＃61; function(dir, input, encode) {
return input ? Plugin[dir](input, encode) : dir ? null : this;
};

Plugin.btoa &＃61; Plugin.encode &＃61; function(plain, utf8encode) {
plain &＃61; Plugin.raw &＃61;&＃61;&＃61; false || Plugin.utf8encode || utf8encode ? UTF8.encode(plain) : plain;
plain &＃61; code(plain, false, r256, b64, 8, 6);
return plain &＃43; &＃39;&＃61;&＃61;&＃61;&＃61;&＃39;.slice((plain.length % 4) || 4);
};

Plugin.atob &＃61; Plugin.decode &＃61; function(coded, utf8decode) {
coded &＃61; String(coded).split(&＃39;&＃61;&＃39;);
var i &＃61; coded.length;
do {--i;
coded[i] &＃61; code(coded[i], true, r64, a256, 6, 8);
} while (i > 0);
coded &＃61; coded.join(&＃39;&＃39;);
return Plugin.raw &＃61;&＃61;&＃61; false || Plugin.utf8decode || utf8decode ? UTF8.decode(coded) : coded;
};
}(jQuery));