Aplikasi Queue dalam Struktur Data

?html>
?head>
?title>Struktur Data Queue?/title>
?script language = "JavaScript">

var queue = new Array();

function Masuk_Antrian(data) {
queue.unshift(data);
}

function Keluar_Antrian() {
var yang_keluar_antrian = queue.shift();
if (queue.length == 0)
return "Stack Sudah Kosong";
else
return yang_keluar_antrian;
}

function Dalam_Antrian(list) {
list.options.length = 0;
for (var i = 0;i ? queue.length;i++) {
var data = new Option(queue[i]);
list.options[list.options.length] = data;
}
}

?/script>
?/head>
?body>
?form>
?input type=text name=textSimpan>
?input type=button value="Masuk Antrian" onClick='Masuk_Antrian(textSimpan.value);
textSimpan.value=""; Dalam_Antrian(Visualisasi);'>

?select name="Visualisasi" size=12>
?option>Isi Antrian....
?/select>
?input type=text name=textAmbil size=20>
?input type=button value="Keluar Antrian" onClick="textAmbil.value = Keluar_Antrian();
Dalam_Antrian(Visualisasi);">

?/form>
?/body>
?/html>