<script>
    var arr=new Array(1,2,3,4,5,6,7,8,9);
    with (document)
	{
	   write(arr.join(","));
	   write("<br>刪除元素"+arr.shift()+"<br>");
	   write("刪除元素"+arr.shift()+"<br>");
	   write(arr.join(","));
	}
</script>