js 实现Base64编码解码

javascript 把内容进行Base64编码,解码代码如下

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;  
    }  
} 

测试代码如下:

<html>  
    <head>  
        <script src="lib/base64.js" type="text/javascript"></script>  
        <script type="text/javascript">  
            var b = new Base64();   
            var str = b.encode("admin:admin");   
            alert("base64 encode:" + str);   
            str = b.decode(str);   
            alert("base64 decode:" + str);   
        </script>  
    </head>  
    <body>  
    </body>  
</html>  

 

来源://作者:/更新时间:2014-04-16
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