<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>