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

Javascript
我也种棵OO树JXTree[js+css+xml]
新浪中用来显示flash的函数
JXTree对象，读取外部xml文件数据，生成树的函数
用js来格式化字符串示例模仿css
js prototype 格式化数字 By shawl.qiu
新浪刚打开页面出来的全屏广告代码
记录几个javascript有关的小细节
Some tips of wmi scripting in jscript (1)
JavaScript Try...Catch 声明的 使用方法
JS版获取字符串真实长度和取固定长度的字符串函数
Javascript中的数学函数
ArrayList类（增强版）
javascript中巧用“闭包”实现程序的暂停执行功能
javascript判断单选框或复选框是否选中方法集锦
FireFox的getYear的注意事项
JavaScript For...In 使用方法
JavaScript Switch 声明
JavaScript If...Else 声明
JavaScript For 循环
JavaScript While 循环 教程

No. « 59 60 61 62 »

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: 307 ::
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>


'