Program Queue dengan pop dan unshift javascript

?html&
?head&
?title&
Program Queue dengan pop dan unshift javascript
?/title&
?script language = "javascript"&

function DataQueue ()
{
var queue = [] ;
queue.unshift (1) ;
queue.unshift (2) ;

var i = queue.pop () ;
document.write (i + "?br/&") ;
queue.unshift (3) ;
queue.unshift (4) ;
var i = queue.pop () ;
document.write (i + "?br/&") ;
}

?/script&
?/head&

?body&
?form name = "FormStrukturData"&
?input name = "btnQueue" value = "Queue" type = "button" onClick = "DataQueue ();"/&
?/form&
?/body&
?/html&