javascript十六進制數字和ASCII字符之間轉換

var hex="0x29";//十六進制  
var charValue = String.fromCharCode(hex);//生成Unicode字符  
var charCode = charValue.charCodeAt(0);//獲取指定字符的十進制表示.  
var hexOri="0x"+charCode.toString(16);;//將int值轉換為十六進制  
alert("hex:"+hex+"\ncharValue:"+charValue+"\ncharCode:"+charCode+"\nhexOri:"+hexOri);