js unicode编码与解码

var decToHex = function(str) {    var res=[];    for(var i=0;i < str.length;i++)        res[i]=("00"+str.charCodeAt(i).toString(16)).slice(-4);    return "\\u"+res.join("\\u");}var hexToDec = function(str) {    str=str.replace(/\\/g,"%");    return unescape(str);}var str=decToHex("\r\n");alert("编码后："+str+"\n\n解码后："+hexToDec(str));