<script type="text/javascript">
function HTMLEncode(html)
{
var temp = document.createElement ("div");
(temp.textContent != null) ? (temp.textContent = html) : (temp.innerText = html);
var output = temp.innerHTML;
temp = null;
return output;
}
function HTMLDecode(text)
{
var temp = document.createElement("div");
temp.innerHTML = text;
var output = temp.innerText || temp.textContent;
temp = null;
return output;
}
var html = "<br>dffdfqqqqq";
var encodeHTML = HTMLEncode(html);
alert("方法一：" +encodeHTML);
var decodeHTML = HTMLDecode(encodeHTML);
alert("方法一：" +decodeHTML);
</script> javascript; JS版HtmlEncode方法，结果与C#中HttpUtility.HtmlEncode方法一样。
原文：http://www.cnblogs.com/houweibin/p/5616251.html