[javascript]代码库
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Language" content="en-us" />
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta name="GENERATOR" content="Microsoft FrontPage 4.0" />
<meta name="ProgId" content="FrontPage.Editor.Document" />
<title>BASE64编码加密--http://good521.com--GOOD521娱乐在线,超级搜索,搜软件, 电影下载, 变态资源, 图片搜索, 小说搜索, 论坛搜索, 搜索助手, 桌面搜索, 搜索推广, 搜索优化, 搜索软件, 海量搜索,电骆，BT</title>
<style type="text/css">
/*<![CDATA[*/
BODY {
MARGIN-TOP: 8px
}
.style1 {
COLOR: #ff6633
}
TD {
FONT-SIZE: 9pt; LINE-HEIGHT: 15pt
}
A:link {
COLOR: #333333; TEXT-DECORATION: none
}
A:visited {
COLOR: #333333; TEXT-DECORATION: none
}
A:active {
COLOR: #ff6600; TEXT-DECORATION: none
}
A:hover {
COLOR: #ff6600
}
.upline {
BORDER-TOP: #ff6633 1px solid
}
.downline {
BORDER-BOTTOM: #ff6633 1px solid
}
.f1 {
FONT-SIZE: 12px; COLOR: #ff6633; FONT-FAMILY: "Verdana", "Arial", "Helvetica", "sans-serif"; TEXT-DECORATION: none
}
.f2 {
FONT-SIZE: 12px; COLOR: #333333; FONT-FAMILY: "Verdana", "Arial", "Helvetica", "sans-serif"; TEXT-DECORATION: none
}
/*]]>*/
</style>
</head>
<body>
<div align="center">
<center>
<table border="0" cellpadding="0" cellspacing="0" width="760">
<tr>
<td></td>
</tr>
<tr>
<td width="100%">
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber7">
<tr>
<td width="100%">
<table width="100%" border="0" align="center" cellpadding="0" cellspacing="0" bordercolor="#111111" id="AutoNumber8" style="border-collapse: collapse">
<tr>
<td width="103%" align="left" height="30">
<p align="center"><font face="宋体"><b>BASE64编码加密</b></font></p>
</td>
</tr>
<tr>
<td width="103%" align="left">
<script language="javascript" type="text/javascript">
//<![CDATA[
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) {
/* c1 */
do {
c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
} while(i < len && c1 == -1);
if(c1 == -1)
break;
/* c2 */
do {
c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
} while(i < len && c2 == -1);
if(c2 == -1)
break;
out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
/* c3 */
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));
/* c4 */
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.output.value = base64encode(utf16to8(f.source.value))
f.decode.value = utf8to16(base64decode(f.output.value))
}
//]]>
</script>
</td>
<td>
<form name="f">
<p align="left">原码<br />
<textarea name="source" rows="4" cols="104" wrap="soft">
</textarea><br />
<br />
Base64 encode<br />
<textarea name="output" rows="4" cols="104" wrap="soft">
</textarea><br />
<br />
Base64 decode<br />
<textarea name="decode" rows="4" cols="104" wrap="soft">
</textarea><br />
<br />
<input type="button" value="转换" onclick="doit()" /></p>
</form>
</td>
</tr>
<tr>
<td width="103%" align="left"> </td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td></td>
</tr>
</table>
</center>
</div>
</body>
</html>
[代码运行效果截图]
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