Javascript Stringオブジェクト拡張HTML符号化と復号の方法

 
  
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; 
  
}