Base64编码加密JS代码网页版

所属分类：网络编程 / JavaScript 阅读数： 1498

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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Base64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>Base64编码加密</TITLE><META http-equiv=Content-Type content="text/html; charset=gb2312"><META content="MSHTML 6.00.2900.2180" name=GENERATOR></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>  <span class="STYLE1 STYLE4">Base64编码加密</span></CENTER><CENTER><TABLE borderColor=#CCFFFF border=5 borderlight="green">  <TBODY>  <TR>    <TD align=middle>      <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);</P>
<P>function base64encode(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 += 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;}</P>
<P>function base64decode(str) {    var c1, c2, c3, c4;    var i, len, out;</P>
<P>    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;</P>
<P> /* c2 */ do {     c2 = base64DecodeChars[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 = base64DecodeChars[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 = base64DecodeChars[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 = base64encode(utf16to8(f.source.value))    f.decode.value = utf8to16(base64decode(f.output.value))}</SCRIPT>      <H1 align="left" class="STYLE3">Base64</H1>      <FORM       name=f>原码<TEXTAREA name=source rows=4 cols=60>

Base64 encodeBase64 decode
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