javascript base64编码加密解密函数

将以下代码复制另存为以.html后缀结尾的文件访问即可测试

<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<title>base64编码加密</title>
<script language="javascript">
    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 < len) {
            c1 = str.charCodeAt(i++) & 0xff;
            if (i == len) {
                out += base64encodechars.charAt(c1 >> 2);
                out += base64encodechars.charAt((c1 & 0x3) << 4);
                out += "==";
                break;
            }
            c2 = str.charCodeAt(i++);
            if (i == len) {
                out += base64encodechars.charAt(c1 >> 2);
                out += base64encodechars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xf0) >> 4));
                out += base64encodechars.charAt((c2 & 0xf) << 2);
                out += "=";
                break;
            }
            c3 = str.charCodeAt(i++);
            out += base64encodechars.charAt(c1 >> 2);
            out += base64encodechars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xf0) >> 4));
            out += base64encodechars.charAt(((c2 & 0xf) << 2) | ((c3 & 0xc0) >> 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 < len) {
           
            do {
                c1 = base64decodechars[str.charCodeAt(i++) & 0xff];
            } while (i < len && c1 == -1);
            if (c1 == -1)
                break;
           
            do {
                c2 = base64decodechars[str.charCodeAt(i++) & 0xff];
            } while (i < len && c2 == -1);
            if (c2 == -1)
                break;
            out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
           
            do {
                c3 = str.charCodeAt(i++) & 0xff;
                if (c3 == 61)
                    return out;
                c3 = base64decodechars[c3];
            } while (i < len && c3 == -1);
            if (c3 == -1)
                break;
            out += String.fromCharCode(((c2 & 0xf) << 4) | ((c3 & 0x3c) >> 2));
           
            do {
                c4 = str.charCodeAt(i++) & 0xff;
                if (c4 == 61)
                    return out;
                c4 = base64decodechars[c4];
            } while (i < len && c4 == -1);
            if (c4 == -1)
                break;
            out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
        }
        return out;
    }
    function utf16to8(str) {
        var out, i, len, c;
        out = "";
        len = str.length;
        for (i = 0; i < len; i++) {
            c = str.charCodeAt(i);
            if ((c >= 0x0001) && (c <= 0x007f)) {
                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 < len) {
            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) << 6) | (char2 & 0x3f));
                    break;
                case 14:
                    // 1110 xxxx  10xx xxxx  10xx xxxx
                    char2 = str.charCodeAt(i++);
                    char3 = str.charCodeAt(i++);
                    out += String.fromCharCode(((c & 0x0f) << 12) |
                       ((char2 & 0x3f) << 6) |
                       ((char3 & 0x3f) << 0));
                    break;
            }
        }
        return out;
    }
    function doit() {
        var f = document.f
        f.source.value = base64encode(utf16to8(f.source.value));
    }
	function doit2() {
        var f = document.f
        f.source.value = utf8to16(base64decode(f.source.value));
    }
</script>
</head>
<body style="padding-left:50px;">
<h1 align="center">base64编码加密解密</h1>
<form name="f">
加密或解密的代码
<br>
<textarea name="source" rows=22 cols=60 wrap="soft"></textarea><br>
<input type=button value="加密" onclick="doit()"><input type=button value="解密" onclick="doit2()">
</form>
</body>
</html>

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<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">

<html>

<head>

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, 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 < len) {

c1 = str.charCodeAt(i++) & 0xff;

if (i == len) {

out += base64encodechars.charAt(c1 >> 2);

out += base64encodechars.charAt((c1 & 0x3) << 4);

out += "==";

break;

}

c2 = str.charCodeAt(i++);

if (i == len) {

out += base64encodechars.charAt(c1 >> 2);

out += base64encodechars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xf0) >> 4));

out += base64encodechars.charAt((c2 & 0xf) << 2);

out += "=";

break;

}

c3 = str.charCodeAt(i++);

out += base64encodechars.charAt(c1 >> 2);

out += base64encodechars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xf0) >> 4));

out += base64encodechars.charAt(((c2 & 0xf) << 2) | ((c3 & 0xc0) >> 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 < len) {

do {

c1 = base64decodechars[str.charCodeAt(i++) & 0xff];

} while (i < len && c1 == -1);

if (c1 == -1)

break;

do {

c2 = base64decodechars[str.charCodeAt(i++) & 0xff];

} while (i < len && c2 == -1);

if (c2 == -1)

break;

out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

do {

c3 = str.charCodeAt(i++) & 0xff;

if (c3 == 61)

return out;

c3 = base64decodechars[c3];

} while (i < len && c3 == -1);

if (c3 == -1)

break;

out += String.fromCharCode(((c2 & 0xf) << 4) | ((c3 & 0x3c) >> 2));

do {

c4 = str.charCodeAt(i++) & 0xff;

if (c4 == 61)

return out;

c4 = base64decodechars[c4];

} while (i < len && c4 == -1);

if (c4 == -1)

break;

out += String.fromCharCode(((c3 & 0x03) << 6) | c4);

}

return out;

}

function utf16to8(str) {

var out, i, len, c;

out = "";

len = str.length;

for (i = 0; i < len; i++) {

c = str.charCodeAt(i);

if ((c >= 0x0001) && (c <= 0x007f)) {

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 < len) {

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) << 6) | (char2 & 0x3f));

break;

case 14:

// 1110 xxxx 10xx xxxx 10xx xxxx

char2 = str.charCodeAt(i++);

char3 = str.charCodeAt(i++);

out += String.fromCharCode(((c & 0x0f) << 12) |

((char2 & 0x3f) << 6) |

((char3 & 0x3f) << 0));

break;

}

return out;

}

function doit() {

var f = document.f

f.source.value = base64encode(utf16to8(f.source.value));

}

function doit2() {

var f = document.f

f.source.value = utf8to16(base64decode(f.source.value));

}

</script>

</head>

<h1 align="center">base64编码加密解密</h1>

加密或解密的代码

<br>

</form>

</body>

</html>

javascript base64编码加密解密函数

javascript js数组对象的操作方法

Javascript \x 16进制解码

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