标签：
html代码：
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <title>Page Title</title> 5 <style type="text/css"> 6 *{font-family: Consolas;font-style: italic} 7 .responsebox{width:900px;margin:10px auto;padding:10px;border:2px solid #366;border-radius: 10px 0 10px 0; text-align: center} 8 .responsebox input,.responsebox button{font-size: 30px;margin:5px;padding:5px;} 9 .spansuper{vertical-align: super;font-size: 14px} 10 .spanbottom{vertical-align: text-bottom;font-size: 12px;margin-left: -110px} 11 #showbox{width:900px;height:430px;border:5px solid #663;border-radius: 0 20px 0 20px;margin:10px auto;padding:8px;font-size: 20px} 12 </style> 13 </head> 14 <body> 15 <div class="responsebox"> 16 <h1>Javascript Base64 Encode & Decode<span class="spansuper">veinyf@gmail.com</span><span class="spanbottom">2014-12-27 17:44</span></h1> 17 <input type="text" id="input"> 18 <input type="checkbox" id="checkbox" checked="checked">Base64</input> 19 <button id="btn">Convert done !</button> 20 </div> 21 <div id="showbox"></div> 22 </body> 23 <script type="text/javascript"> 24 /*javascript知识： 25 *函数：window.atob() window.btoa() unescape() escape() encodeURIComponent() decodeURIComponent() 26 *正则表达式清除首位空格：_string.replace(/(^\s*)|(\s*$)/g,""); 27 * 28 *CovertBase64orString自执行函数 29 *inputid 输入框id 30 *checkboxid 选择框id 31 *btnid 按钮id 32 *showid html显示容器id，这里是一个div#showbox 33 */ 34 (function CovertBase64orString(inputid, checkboxid, btnid, showid) { 35 var checkbox = document.getElementById(checkboxid); //html dom select checkbox 36 var chkvalue = checkbox.getAttribute("checked"); //html dom select checkedvalue 37 var btn = document.getElementById(btnid); //html dom select button id 38 var isbase64; //base64toString or StringtoBase64 bool 39 var returnval = null; //Converted string 40 chkvalue == "checked" ? isbase64 = true : isbase64 = false; //判断check按钮初始化状态 赋值isbase64 41 checkbox.addEventListener("click", function(e) { //checkbox 点击事件注册 42 var _ckvak = checkbox.getAttribute("checked"); //点击事件发生时，改变check状态，赋值isbase64 43 if (_ckvak == "checked") { 44 checkbox.setAttribute("checked", null); 45 isbase64 = false; 46 } else { 47 checkbox.setAttribute("checked", "checked"); 48 isbase64 = true; 49 } 50 }, true); 51 btn.addEventListener("click", function(e) { //button 点击事件注册 52 var _show = document.getElementById(showid); //html dom select showbox id 53 var _inputvalue = document.getElementById(inputid).value; //文本框取值 54 //_inputvalue=_inputvalue.replace(/(^\s*)|(\s*$)/g, ""); //正则表达式去除首位空格，似乎btoa，abob已经做了这些工作 55 var _showlength = _show.childNodes.length; //遍历showbox，清除showbox内容 56 while (_showlength > 0) { 57 _show.removeChild(_show.childNodes[_showlength - 1]); 58 _showlength--; 59 } 60 if (isbase64) { //string to base64，支持中文编码，unescape，encodeURIComponent 61 returnval = window.btoa(unescape(encodeURIComponent(_inputvalue))); 62 } else { //base64 to string 63 returnval = decodeURIComponent(escape(window.atob(_inputvalue))); 64 } 65 _show.appendChild(document.createTextNode(returnval)); //add context to showbox 66 }, true); 67 })("input", "checkbox", "btn","showbox"); 68 //CovertBase64orString("input", "checkbox", "btn","showbox"); 69 </script> 70 </html>
效果：
推荐一个Javascript IDE 比Aptana还好用。Komodo IDE（免费版：Komodo Edit，基本功能一样）支持语法高亮，智能感知，还支持perl，python，ruby，nodejs语法等。
Javascript Base64 Encode & Decode
标签：
原文地址：http://www.cnblogs.com/veiny/p/4188966.html
