JavaScript 实现base64数据加密

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在用户登录提交表单数据的时候，需要对用户的用户名和密码进行加密，这里采用base64编码加密的方式。

在js中，定义一个Base64加密的方法，具体的代码如下：

<html><head><script type="text/javascript"> function Base64() { // private property_keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; // public method for encodingthis.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 decodingthis.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;}}</script></head><body><script type="text/javascript"><span style="white-space:pre"></span>var b = new Base64();var str = b.encode("userName：maxwell");alert("base64 encode:" + str);str = b.decode(str);alert("base64 decode:" + str);</script></body></html>

在定义完成之后，在body中作了一个测试，测试验证userName：maxwell的加密和解密字符串。

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