Javascript 给String对象扩展HTML编码和解码的方法

了解基本先阅读这里：http://blog.csdn.net/xxd851116/archive/2009/06/01/4234518.aspx

String.prototype.HTMLEncode = function() {
 var temp = document.createElement ("div");
 (temp.textContent != null) ? (temp.textContent = this) : (temp.innerText = this);
 var output = temp.innerHTML;
 temp = null;
 return output;
}

String.prototype.HTMLDecode = function() {
 var temp = document.createElement("div");
 temp.innerHTML = this;
 var output = temp.innerText || temp.textContent;
 temp = null;
 return output;
}