PHP与JavaScript之间中文base64码转换代码

//php base64_encode

function str_encode($str){
        return base64_encode(iconv('GB18030','UTF-8',$str));
}
echo str_encode('你好!美女!');
?>

//////////////////////////////////////////////////////////////////////////////////////

另附PHP的base64的加解密函数！

 {echo base64_encode($str)."
";    //加密
$ss='Z25pZD0yNSZncGljaT0x';
  echo base64_decode($ss);         //解密
/////////////////////////////////////////////////////////////////////////////////////

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//JavaScript  base64_decode

/*
* Interfaces:
* utf8 = utf16to8(utf16);
* utf16 = utf16to8(utf8);
*/

function utf16to8(str) {
    var out, i, len, c;

    out = "";
    len = str.length;
    for(i = 0; i         c = str.charCodeAt(i);
        if ((c >= 0x0001) && (c             out += str.charAt(i);
        } else if (c > 0x07FF) {
            out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
            out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));
            out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
        } else {
            out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));
            out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
        }
    }
    return out;
}

function utf8to16(str) {
    var out, i, len, c;
    var char2, char3;

    out = "";
    len = str.length;
    i = 0;
    while(i         c = str.charCodeAt(i++);
        switch(c >> 4)
        { 
          case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
            // 0xxxxxxx
            out += str.charAt(i-1);
            break;
          case 12: case 13:
            // 110x xxxx   10xx xxxx
            char2 = str.charCodeAt(i++);
            out += String.fromCharCode(((c & 0x1F)             break;
          case 14:
            // 1110 xxxx  10xx xxxx  10xx xxxx
            char2 = str.charCodeAt(i++);
            char3 = str.charCodeAt(i++);
            out += String.fromCharCode(((c & 0x0F)                                            ((char2 & 0x3F)                                            ((char3 & 0x3F)             break;
        }
    }

    return out;
}

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/* Copyright (C) 1999 Masanao Izumo
* Version: 1.0
* LastModified: Dec 25 1999
* This library is free.  You can redistribute it and/or modify it.
*/

/*
* Interfaces:
* b64 = base64encode(data);
* data = base64decode(b64);
*/

var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64DecodeChars = new Array(
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);

function base64encode(str) {
    var out, i, len;
    var c1, c2, c3;

    len = str.length;
    i = 0;
    out = "";
    while(i         c1 = str.charCodeAt(i++) & 0xff;
        if(i == len)
        {
            out += base64EncodeChars.charAt(c1 >> 2);
            out += base64EncodeChars.charAt((c1 & 0x3)             out += "==";
            break;
        }
        c2 = str.charCodeAt(i++);
        if(i == len)
        {
            out += base64EncodeChars.charAt(c1 >> 2);
            out += base64EncodeChars.charAt(((c1 & 0x3)> 4));
            out += base64EncodeChars.charAt((c2 & 0xF)             out += "=";
            break;
        }
        c3 = str.charCodeAt(i++);
        out += base64EncodeChars.charAt(c1 >> 2);
        out += base64EncodeChars.charAt(((c1 & 0x3)> 4));
        out += base64EncodeChars.charAt(((c2 & 0xF) >6));
        out += base64EncodeChars.charAt(c3 & 0x3F);
    }
    return out;
}

function base64decode(str) {
    var c1, c2, c3, c4;
    var i, len, out;

    len = str.length;
    i = 0;
    out = "";
    while(i         /* c1 */
        do {
            c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
        } while(i         if(c1 == -1)
            break;

        /* c2 */
        do {
            c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
        } while(i         if(c2 == -1)
            break;

        out += String.fromCharCode((c1 > 4));

        /* c3 */
        do {
            c3 = str.charCodeAt(i++) & 0xff;
            if(c3 == 61)
                return out;
            c3 = base64DecodeChars[c3];
        } while(i         if(c3 == -1)
            break;

        out += String.fromCharCode(((c2 & 0XF) > 2));

        /* c4 */
        do {
            c4 = str.charCodeAt(i++) & 0xff;
            if(c4 == 61)
                return out;
            c4 = base64DecodeChars[c4];
        } while(i         if(c4 == -1)
            break;
        out += String.fromCharCode(((c3 & 0x03)     }
    return out;
}
//input base64 encode
function strdecode(str){
        return utf8to16(base64decode(str));
}
document.write(strdecode('5L2g5aW9Iee+juWlsyE='));