JS函数实现base64加密、base64解密
一、封装函数
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/** * * Base64 encode / decode * * @author mrdede * @date 2010-04-26 * @email 1234567@qq.com * * 使用方法： * // 1.加密 * var str = '124中文内容'; * var base = new Base64(); * var result = base.encode(str); * document.write(result); * * // 2.解密 * var result2 = base.decode(result); * document.write(result2); * */ 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; } } |
二、成品插件
1、下载地址 https://github.com/dankogai/js-base64
亲侧使用实例：
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<script src="base64.js"></script> <script> var str = 'mrdede.com/#@/?name=织梦先生&speak=我是 中国人'; var obj = {}; obj.ec = Base64.encode(str); // bXJkZWRlLmNvbS8jQC8/bmFtZT3nu4fmoqblhYjnlJ8mc3BlYWs95oiR5pivIOS4reWbveS6ug== obj.ecu = Base64.encodeURI(str); // bXJkZWRlLmNvbS8jQC8_bmFtZT3nu4fmoqblhYjnlJ8mc3BlYWs95oiR5pivIOS4reWbveS6ug obj.dc = Base64.decode(obj.ec); // mrdede.com/#@/?name=织梦先生&speak=我是 中国人 obj.dcu = Base64.decode(obj.ec); // mrdede.com/#@/?name=织梦先生&speak=我是 中国人 console.log('obj=',obj); </script> |
2、下载地址 https://github.com/yckart/jquery.base64.js
中文不可用
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<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <title>base64加密</title> <script type="text/javascript" src="base64.js"></script> <script type="text/javascript"> var a="123"; var b=$.base64.btoa(a); console.log(a===$.base64.atob(b)); </script> </head> <body> </body> </html> |
三、关于提交给服务器后Base64中的加号（“+”）变成了空格的问题
在服务器脚本中把空格替换为加号（“+”），以PHP脚本为例：
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//解决base64转码过程中+变成空格的问题 $key = str_replace(' ','+',$_POST('key')); $key = base64_decode($key); |