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index.html
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index.html
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<!DOCTYPE html>
<html>
<head>
<title>信用卡回饋計算機</title>
<style>
body {
text-align: center;
}
input[type="number"] {
width: 50%;
text-align: center;
margin: 0 auto;
display: block;
font-size: 1.2em;
}
button {
width: 30%;
margin: 0 auto;
display: block;
font-size: 1.2em;
}
@media (max-width: 767px) {
input[type="number"],
button {
font-size: 1.5em;
}
}
</style>
</head>
<body>
<h1>信用卡回饋計算機</h1>
<p>輸入您的信用卡消費金額：</p>
<input type="number" id="amountSpent" />
<p>輸入回饋百分比：</p>
<input type="number" id="rewardsPercentage" />
<br /><br />
<button id="calculateButton">計算回饋</button>
<br /><br />
<p>回饋金額：</p>
<input type="number" id="rewardsAmount" readonly />
<script>
const calculateButton = document.getElementById("calculateButton");
const amountSpent = document.getElementById("amountSpent");
const rewardsPercentage = document.getElementById("rewardsPercentage");
const rewardsAmount = document.getElementById("rewardsAmount");
calculateButton.addEventListener("click", function () {
rewardsAmount.value =
(amountSpent.value * rewardsPercentage.value) / 100;
});
</script>
</body>
</html>