当前位置: 首页 > 图文教程 > 网络编程 > Javascript > base64编码/解码

Javascript
JS暴虐查找法简洁版
JavaScript数组问题解决的多种方法
比较炫的图片播放器 js 焦点效果代码
js iframe网站后台左右收缩型页面脚本
javascript完美随机广告代码
北京奥运会倒计时代码
javascript 数据结构的题
js停止输出代码
兼容多浏览器的字幕特效Marquee的通用js类
IE8 引入跨站数据获取功能说明
javascript 支持ie和firefox杰奇翻页函数
js添加删除行和双击变文本框的脚本
JavaScript 版本自动生成文章摘要
用js遍历 table的脚本
用JavaScript实现UrlEncode和UrlDecode的脚本代码
css把超出的部分显示为省略号的方法兼容火狐
javascript IE中的DOM ready应用技巧
js退弹 IE关闭时弹出广告代码,可以防止屏蔽
js类中的公有变量和私有变量
兼容firefox的给每一个onClick再附加一个事件

No. « 104 105 106 107 »

技术文章搜索

关键字

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: 483 ::
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>


'