js base64加密

// base64加密开始  
        var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv"  
                + "wxyz0123456789+/" + "=";  

        function encode64(input) {  

            var output = "";  
            var chr1, chr2, chr3 = "";  
            var enc1, enc2, enc3, enc4 = "";  
            var i = 0;  
            do {  
                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);  
                chr1 = chr2 = chr3 = "";  
                enc1 = enc2 = enc3 = enc4 = "";  
            } while (i < input.length);  

            return output;  
        }  
        // base64加密结束  

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