浅谈Javascript Base64 加密解密

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html代码：

复制代码代码如下:
<!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*$)/g,"");
      *
      *CovertBase64orString自执行函数
      *inputid   输入框id
      *checkboxid    选择框id
      *btnid 按钮id
      *showid    html显示容器id，这里是一个div#showbox
      */
(function CovertBase64orString(inputid, checkboxid, btnid, showid) {
     var checkbox = document.getElementById(checkboxid); //html dom select checkbox
     var chkvalue = checkbox.getAttribute("checked");    //html dom select checkedvalue
     var btn = document.getElementById(btnid);           //html dom select button id
     var isbase64;                                       //base64toString or StringtoBase64 bool
     var returnval = null;                               //Converted string
     chkvalue == "checked" "click", function(e) {            //checkbox 点击事件注册
         var _ckvak = checkbox.getAttribute("checked");          //点击事件发生时，改变check状态，赋值isbase64
         if (_ckvak == "checked") {
             checkbox.setAttribute("checked", null);
             isbase64 = false;
         } else {
             checkbox.setAttribute("checked", "checked");
             isbase64 = true;
         }
     }, true);
     btn.addEventListener("click", function(e) {                    //button 点击事件注册
         var _show = document.getElementById(showid);               //html dom select showbox id
         var _inputvalue = document.getElementById(inputid).value;   //文本框取值
         //_inputvalue=_inputvalue.replace(/(^\s*)|(\s*$)/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>