Base编码加密JS代码网页版_javascript技巧

来源：桦砣汽车网

你可将本页保存后上传到你的网站中，这样你就拥有了一个Base编码加密、解密的功能页面，让需要的用户去访问你的网页。

<HTML>
<HEAD>
<TITLE>Base编码加密</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.2900.2180" name=GENERATOR>
<style type="text/css">

</style>
</HEAD></P>
<P><STYLE type=text/css>
BODY {
 MARGIN-TOP: 0px; FONT-SIZE: 9pt; MARGIN-LEFT: 0px; MARGIN-RIGHT: 0px; FONT-FAMILY: "宋体"
}
A {
 FONT-WEIGHT: 400; FONT-SIZE: 9pt; COLOR: black; TEXT-DECORATION: none
}
A:hover {
 FONT-WEIGHT: 400; FONT-SIZE: 9pt; COLOR: red; TEXT-DECORATION: underline
}
A:active {
 FONT: 9pt "宋体"; CURSOR: hand; COLOR: #ff0033
}
.STYLE1 {font-size: 40px}
.STYLE3 {color: #990033}
</STYLE></P>
<P><BODY bgColor=#fef4d9>

<CENTER>
 Base编码加密
</CENTER>

<CENTER>
<TABLE borderColor=#CCFFFF border=5 borderlight="green">
 <TBODY>
 <TR>
 <TD align=middle>
 
var baseEncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567+/";
var baseDecodeChars = 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);</P>
<P>function baseencode(str) {
 var out, i, len;
 var c1, c2, c3;</P>
<P> len = str.length;
 i = 0;
 out = "";
 while(i < len) {
 c1 = str.charCodeAt(i++) & 0xff;
 if(i == len)
 {
 out += baseEncodeChars.charAt(c1 >> 2);
 out += baseEncodeChars.charAt((c1 & 0x3) << 4);
 out += "==";
 break;
 }
 c2 = str.charCodeAt(i++);
 if(i == len)
 {
 out += baseEncodeChars.charAt(c1 >> 2);
 out += baseEncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
 out += baseEncodeChars.charAt((c2 & 0xF) << 2);
 out += "=";
 break;
 }
 c3 = str.charCodeAt(i++);
 out += baseEncodeChars.charAt(c1 >> 2);
 out += baseEncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
 out += baseEncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
 out += baseEncodeChars.charAt(c3 & 0x3F);
 }
 return out;
}</P>
<P>function basedecode(str) {
 var c1, c2, c3, c4;
 var i, len, out;</P>
<P> len = str.length;
 i = 0;
 out = "";
 while(i < len) {
 /* c1 */
 do {
 c1 = baseDecodeChars[str.charCodeAt(i++) & 0xff];
 } while(i < len && c1 == -1);
 if(c1 == -1)
 break;</P>
<P> /* c2 */
 do {
 c2 = baseDecodeChars[str.charCodeAt(i++) & 0xff];
 } while(i < len && c2 == -1);
 if(c2 == -1)
 break;</P>
<P> out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));</P>
<P> /* c3 */
 do {
 c3 = str.charCodeAt(i++) & 0xff;
 if(c3 == 61)
 return out;
 c3 = baseDecodeChars[c3];
 } while(i < len && c3 == -1);
 if(c3 == -1)
 break;</P>
<P> out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));</P>
<P> /* c4 */
 do {
 c4 = str.charCodeAt(i++) & 0xff;
 if(c4 == 61)
 return out;
 c4 = baseDecodeChars[c4];
 } while(i < len && c4 == -1);
 if(c4 == -1)
 break;
 out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
 }
 return out;
}</P>
<P>function utf16to8(str) {
 var out, i, len, c;</P>
<P> 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;
}</P>
<P>function utf8to16(str) {
 var out, i, len, c;
 var char2, char3;</P>
<P> 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;
 }
 }</P>
<P> return out;
}
function doit() {
 var f = document.f
 f.output.value = baseencode(utf16to8(f.source.value))
 f.decode.value = utf8to16(basedecode(f.output.value))
}

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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Base编码加密JS代码网页版_javascript技巧