浅谈 Javascript Base64 加密解密

html代码：
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<!DOCTYPE html>  

 <html>  

 <head>  

     <title>Page Title</title>  

     <style type="text/css">  

     *{font-family: Consolas;font-style: italic}  

     .responsebox{width:900px;margin:10px auto;padding:10px;border:2px solid #366;border-radius: 10px 0 10px 0; text-align: center}  

     .responsebox input,.responsebox button{font-size: 30px;margin:5px;padding:5px;}  

     .spansuper{vertical-align: super;font-size: 14px}  

     .spanbottom{vertical-align: text-bottom;font-size: 12px;margin-left: -110px}  

     #showbox{width:900px;height:430px;border:5px solid #663;border-radius: 0 20px 0 20px;margin:10px auto;padding:8px;font-size: 20px}  

     </style>  

 </head>  

 <body>  

 <div class="responsebox">  

     <h1>Javascript Base64 Encode & Decode<span class="spansuper">veinyf@gmail.com</span><span class="spanbottom">2014-12-27 17:44</span></h1>  

     <input type="text" id="input">  

     <input type="checkbox" id="checkbox" checked="checked">Base64</input>  

     <button id="btn">Convert done !</button>  

 </div>  

 <div id="showbox"></div>  

 </body>  

 <script type="text/javascript">  

     /*javascript知识： 

      *函数：window.atob()    window.btoa()   unescape() escape() encodeURIComponent() decodeURIComponent() 

      *正则表达式清除首位空格：_string.replace(/(^\s*)|(\s*$)/g,""); 

      * 

      *CovertBase64orString自执行函数 

      *inputid   输入框id 

      *checkboxid    选择框id 

      *btnid 按钮id 

      *showid    html显示容器id，这里是一个div#showbox 

      */  

 (function CovertBase64orString(inputid, checkboxid, btnid, showid) {  

     var checkbox = document.getElementById(checkboxid); //html dom select checkbox  

     var chkvalue = checkbox.getAttribute("checked");    //html dom select checkedvalue  

     var btn = document.getElementById(btnid);           //html dom select button id  

     var isbase64;                                       //base64toString or StringtoBase64 bool  

     var returnval = null;                               //Converted string  

     chkvalue == "checked" ? isbase64 = true : isbase64 = false; //判断check按钮初始化状态 赋值isbase64  

     checkbox.addEventListener("click", function(e) {            //checkbox 点击事件注册  

         var _ckvak = checkbox.getAttribute("checked");          //点击事件发生时，改变check状态，赋值isbase64  

         if (_ckvak == "checked") {  

             checkbox.setAttribute("checked", null);  

             isbase64 = false;  

         } else {  

             checkbox.setAttribute("checked", "checked");  

             isbase64 = true;  

         }  

     }, true);  

     btn.addEventListener("click", function(e) {                    //button 点击事件注册  

         var _show = document.getElementById(showid);               //html dom select showbox id  

         var _inputvalue = document.getElementById(inputid).value;   //文本框取值  

         //_inputvalue=_inputvalue.replace(/(^\s*)|(\s*$)/g, "");    //正则表达式去除首位空格，似乎btoa，abob已经做了这些工作  

         var _showlength = _show.childNodes.length;                  //遍历showbox，清除showbox内容  

         while (_showlength > 0) {  

             _show.removeChild(_show.childNodes[_showlength - 1]);  

             _showlength--;  

         }  

         if (isbase64) {  //string to base64，支持中文编码，unescape，encodeURIComponent  

             returnval = window.btoa(unescape(encodeURIComponent(_inputvalue)));  

         } else {        //base64 to string  

             returnval = decodeURIComponent(escape(window.atob(_inputvalue)));  

         }  

         _show.appendChild(document.createTextNode(returnval));          //add context to showbox  

     }, true);  

 })("input", "checkbox", "btn","showbox");  

 //CovertBase64orString("input", "checkbox", "btn","showbox");  

 </script>  

 </html>
效果：
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