JS特殊符号的replace转码替换方法.

里面转的不全, 比如& 很多没有加, 自己添加把.

关于转义字符先关的网址:

• &nbsp|&quot|&amp|&lt|&gt等html字符转义 – http://blog.csdn.net/wusuopubupt/article/details/8817826
• HTML字符实体（Character Entities），转义字符串（Escape Sequence）- http://114.xixik.com/character/

 

<script>
        window.onload = function () {
            var xxxx = "&quot;&lt;&gt;&amp;测试代码";
            alert(html_decode(xxxx));
        }

function html_encode(str)   
{   
  var s = "";   
  if (str.length == 0) return "";   
  s = str.replace(/&/g, "&gt;");   
  s = s.replace(/</g, "&lt;");   
  s = s.replace(/>/g, "&gt;");   
  s = s.replace(/ /g, "&nbsp;");   
  s = s.replace(/\'/g, "&#39;");   
  s = s.replace(/\"/g, "&quot;");   
  s = s.replace(/\n/g, "<br>");   
  return s;   
}   

function html_decode(str)   
{   
  var s = "";   
  if (str.length == 0) return "";   
  s = str.replace(/&gt;/g, "&");   
  s = s.replace(/&lt;/g, "<");   
  s = s.replace(/&gt;/g, ">");   
  s = s.replace(/&nbsp;/g, " ");   
  s = s.replace(/&#39;/g, "\'");   
  s = s.replace(/&quot;/g, "\"");   
  s = s.replace(/<br>/g, "\n");   
  return s;   
}   

</script>