Base64加密解密JS通用版

<script type="text/javascript">
//www.haokucn.com
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";   
//加密   
function base64encode(Str) {   
    Str = escape(Str);   
    var output = "";   
    var chr1, chr2, chr3 = "";   
    var enc1, enc2, enc3, enc4 = "";   
    var i = 0;   
    do {   
        chr1 = Str.charCodeAt(i++);   
        chr2 = Str.charCodeAt(i++);   
        chr3 = Str.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 < Str.length);   
    return output;   
}   
//解密   
function base64decode(Str) {   
    var output = "";   
    var chr1, chr2, chr3 = "";   
    var enc1, enc2, enc3, enc4 = "";   
    var i = 0;   
    var base64test = /[^A-Za-z0-9\+\/\=]/g;   
    if (base64test.exec(Str)){}   
    Str = Str.replace(/[^A-Za-z0-9\+\/\=]/g, "");   
    do {   
        enc1 = keyStr.indexOf(Str.charAt(i++));   
        enc2 = keyStr.indexOf(Str.charAt(i++));   
        enc3 = keyStr.indexOf(Str.charAt(i++));   
        enc4 = keyStr.indexOf(Str.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);}   
        chr1 = chr2 = chr3 = "";   
        enc1 = enc2 = enc3 = enc4 = "";   
    } while (i < Str.length);   
    return unescape(output);   
}   
document.write(base64encode('www.haokucn.com'))   
document.write(base64decode('JXU4NEREJXU5NkU4'))   
document.write(base64decode(base64encode('www.haokucn.com')))   
</script>   

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