繁體中文当前位置: 首页 > 图文教程 > 网络编程 > Javascript > base64编码/解码
- Javascript
- jquery中常用的SET和GET
- 解javascript 混淆加密收藏
- JavaScript 在线压缩和格式化收藏
- JavaScript URL参数读取改进版
- javascript打开新窗口同时关闭旧窗口
- 借用Google的Javascript API Loader来加速你的网站
- javascript Xml增删改查(IE下)操作实现代码
- js操作Xml(向服务器发送Xml,处理服务器返回的Xml)(IE下有效)
- 最近项目写了一些js，水平有待提高
- JavaScript库 开发规则
- JavaScript入门教程(1) 什么是JS
- JavaScript入门教程(2) JS基础知识
- JavaScript入门教程(3) js面向对象
- JavaScript入门教程(4) js浏览器对象
- JavaScript入门教程(5) js Screen屏幕对象
- JavaScript入门教程(7) History历史对象
- JavaScript入门教程(8) Location地址对象
- JavaScript入门教程(9) Document文档对象
- JavaScript入门教程(11) js事件处理
- JavaScript入门教程(12) js对象化编程
Javascript 中的 base64编码/解码
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-08-10 浏览: 448 ::
收藏到网摘: n/a
编者:解决了对中文的不支持问题.
先用escape()对中文进行编码.然后再进行base64编码.
解码时,再加入unescape()对中文进行解码.
<html>
<head>
<title>base64 Encoding/Decoding</title>
</head>
<script type="text/javascript"><!--
var keyStr = "ABCDEFGHIJKLMNOP" +
"QRSTUVWXYZabcdef" +
"ghijklmnopqrstuv" +
"wxyz0123456789+/" +
"=";
function encode64(input) {
input = escape(input);
var output = "";
var chr1, chr2, chr3 = "";
var enc1, enc2, enc3, enc4 = "";
var i = 0;
do {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output +
keyStr.charAt(enc1) +
keyStr.charAt(enc2) +
keyStr.charAt(enc3) +
keyStr.charAt(enc4);
chr1 = chr2 = chr3 = "";
enc1 = enc2 = enc3 = enc4 = "";
} while (i < input.length);
return output;
}
function decode64(input) {
var output = "";
var chr1, chr2, chr3 = "";
var enc1, enc2, enc3, enc4 = "";
var i = 0;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
var base64test = /[^A-Za-z0-9\+\/\=]/g;
if (base64test.exec(input)) {
alert("There were invalid base64 characters in the input text.\n" +
"Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +
"Expect errors in decoding.");
}
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
do {
enc1 = keyStr.indexOf(input.charAt(i++));
enc2 = keyStr.indexOf(input.charAt(i++));
enc3 = keyStr.indexOf(input.charAt(i++));
enc4 = keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
chr1 = chr2 = chr3 = "";
enc1 = enc2 = enc3 = enc4 = "";
} while (i < input.length);
return unescape(output);
}
//--></script>
<body>
<form name="base64Form">
Type in the message you want to encode in base64, or paste<br>
base64 encoded text into the text field, select Encode or Decode, <br>
and click the button!<br>
<textarea name="theText" cols="40" rows="6"></textarea><br>
<input type="button" name="encode" value="Encode to base64"
onClick="document.base64Form.theText.value=encode64(document.base64Form.theText.value);">
<input type="button" name="decode" value="Decode from base64"
onClick="document.base64Form.theText.value=decode64(document.base64Form.theText.value);">
</form>
</body>
</html>
'
评论 (0) All
