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>

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

<!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

发表评论点击这里取消回复。

热门标签

最新评论

热评文章

大家都在看

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

猜你喜欢

取消鼠标拖动选中文字的方法

layer关闭弹窗（多种关闭弹窗方法）

jQuery对象与dom对象的转换-$(‘#id)[0]

javascript中 event.keyCode – 兼容IE和Firefox

html中IE下判断IE版本,js判断浏览器

Javascript \x 16进制 解码

发表评论 点击这里取消回复。

热门标签

最新评论

热评文章

大家都在看

大家都在搜

微信公众号

Javascript \x 16进制解码

Javascript \x 16进制解码

发表评论点击这里取消回复。