js的utf8编码与解码

 function encodeUTF8(str){
	var temp = "",rs = "";
	for( var i=0 , len = str.length; i < len; i++ ){
		temp = str.charCodeAt(i).toString(16);
		rs  += "\\u"+ new Array(5-temp.length).join("0") + temp;
	}
	return rs;
 }
 function decodeUTF8(str){
	return str.replace(/(\\u)(\w{4}|\w{2})/gi, function($0,$1,$2){
		return String.fromCharCode(parseInt($2,16));
	}); 
 }