01

 <title>林虹彤程式設計</title>

<script>

const McDonald = ['🍔', '🍟', '🍕', '🌭', '🥪', '🍿'];

function compute()

{

var food = document.getElementById("food");

document.getElementById("out").innerHTML = "<font size=7>".concat(McDonald[food.selectedIndex],"</font>");

}

</script>

<h1>下拉式選單</h1>

<select id="food">

  <option selected>🍔漢堡</option>

  <option>🍟薯條</option>

  <option>🍕披薩</option>

  <option>🌭熱狗</option>

  <option>🥪三明治</option>

  <option>🍿爆米花</option>

</select>

<input onclick="compute()" type="button" value="送上餐點" />

<p id="out"></p>