jquery-base64.js插件使⽤官⽅⽂档地址：github/yckart/jquery.base64.js
var a="123";
var b=$.base64.btoa(a);
console.log(a===$.base64.atob(b));
true;
var a="123";
var b=$.base64.atob(a);
console.log(a===$.base64.btoa(b));
false;
/*!
* jquery.base64.js 0.1 - github/yckart/jquery.base64.js
* Makes Base64 en & -decoding simpler as it is.
*
* Based upon: gist.github/Yaffle/1284012
*
* Copyright (c) 2012 Yannick Albert (yckart)nexus3使用
* Licensed under the MIT license (/licenses/mit-license.php).
* 2013/02/10
**/
;(function($) {
var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
a256 = '',
r64 = [256],
r256 = [256],
i = 0;
var UTF8 = {jquery下载文件插件
/**
* Encode multi-byte Unicode string into utf-8 multiple single-byte characters
* (BMP / basic multilingual plane only)
*
* Chars in range U+0080 - U+07FF are encoded in 2 chars, U+0800 - U+FFFF in 3 chars
*
* @param {String} strUni Unicode string to be encoded as UTF-8
* @returns {String} encoded string
*/
encode: function(strUni) {
// use regular expressions & place callback function for better efficiency
// than procedural approaches
var strUtf = place(/[\u0080-\u07ff]/g, // U+0080 - U+07FF => 2 bytes 110yyyyy, 10zzzzzz
function(c) {
var cc = c.charCodeAt(0);
return String.fromCharCode(0xc0 | cc >> 6, 0x80 | cc & 0x3f);
})
.replace(/[\u0800-\uffff]/g, // U+0800 - U+FFFF => 3 bytes 1110xxxx, 10yyyyyy, 10zzzzzz
function(c) {
var cc = 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
*
* @param {String} strUtf UTF-8 string to be decoded back to Unicode
苹果怎么启用javascript* @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 = place(/[\u00e0-\u00ef][\u0080-\u00bf][\u0080-\u00bf]/g, // 3-byte chars
function(c) { // (note parentheses for precence)
var cc = ((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 = (c.charCodeAt(0) & 0x1f) << 6 | c.charCodeAt(1) & 0x3f;
return String.fromCharCode(cc);
});
return strUni;
}linux重启命令是
};
while(i < 256) {
var c = String.fromCharCode(i);
a256 += c;
r256[i] = i;
r64[i] = b64.indexOf(c);
++i;
}
function code(s, discard, alpha, beta, w1, w2) {
s = String(s);
var buffer = 0,
i = 0,
length = s.length,
result = '',
bitsInBuffer = 0;
while(i < length) {
var c = s.charCodeAt(i);
c = c < 256 ? alpha[c] : -1;
buffer = (buffer << w1) + c;
bitsInBuffer += w1;
while(bitsInBuffer >= w2) {
bitsInBuffer -= w2;
var tmp = buffer >> bitsInBuffer;
result += beta.charAt(tmp);
buffer ^= tmp << bitsInBuffer;
余切函数图像的画法}
++i;
}
if(!discard && bitsInBuffer > 0) result += beta.charAt(buffer << (w2 - bitsInBuffer));
return result;
}
java右移位var Plugin = $.base64 = function(dir, input, encode) {
return input ? Plugin[dir](input, encode) : dir ? null : this;
};
Plugin.btoa = de = function(plain, utf8encode) {
plain = Plugin.raw === false || Plugin.utf8encode || utf8encode ? de(plain) : plain;        plain = code(plain, false, r256, b64, 8, 6);
return plain + '===='.slice((plain.length % 4) || 4);
};
Plugin.atob = Plugin.decode = function(coded, utf8decode) {
coded = String(coded).split('=');
var i = coded.length;
do {--i;
coded[i] = code(coded[i], true, r64, a256, 6, 8);
} while (i > 0);
coded = coded.join('');
return Plugin.raw === false || Plugin.utf8decode || utf8decode ? UTF8.decode(coded) : coded;    };
}(jQuery));

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