js Unicode编码相互转换

<script>
    /*
     *js Unicode编码转换
     */
    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("PHP二次开发：www.php2.cc");
    alert("编码后：" + str + "\n\n解码后：" + hexToDec(str));
</script>