我如何改变零食和食品的价值我想当我换凉饮料然后显示百事可乐，可可和雪碧当我更改食物时，然后显示Pizza，Chicken＆Bar b Q
<html>
<head>
<title>Food Order</title>
</head>
<body>
<select id="food" >
<option>Cool Drink</option>
<option>Food</option>
</select>
<select id="Person" >
<option>Pepsi</option>
<option>Coac</option>
<option>Sprite</option>
<option>Bar b Q</option>
<option>Chicken</option>
<option>Pizza</option>
</select>
</body>
</html>
const drinks = ["Pepsi", "Cola"];
const food = ["Pizza 1", "Pizza 2"]
然后创建JS函数，将由事件onChange触发并更新第二个下拉列表。
function changeList(name){ if (name === "Food") { // fill list with foods } // fill list with drinks }