Shellcode Encoder/Decoder

function shellcode(e, c) {
    if (e == "decode" && c != "") {
        var c1 = unescape(c);
        return(c1);
    } else if (e == "encode" && c != "") {
        var c2 = escape(c);
        return(c2);
    }
}

shellcode("decode","%u7679%u4673%u757b%u924e%u66b9%ub441%u018d%u7df9%u241c%ud631%u40b7%ueb11%u043d")
/* shellcode("encode","癹䙳畻鉎暹둁ƍ緹␜혱䂷н") */