javascript中的Base64、UTF8编码与解码详解(3)

 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));
    });
 }