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| <!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>BMI 计算器</title>
<style>
body {
font-family: "Helvetica Neue", sans-serif;
background: linear-gradient(to right, #f9f9f9, #e2f0ff);
padding: 30px;
margin: 0;
}
.container {
max-width: 400px;
margin: 0 auto;
background: #fff;
padding: 24px;
border-radius: 16px;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
h2 {
text-align: center;
margin-bottom: 24px;
color: #0078d7;
}
label {
display: block;
margin-top: 12px;
font-weight: bold;
}
input {
width: 100%;
padding: 10px;
margin-top: 6px;
border-radius: 8px;
border: 1px solid #ccc;
box-sizing: border-box;
}
button {
width: 100%;
margin-top: 20px;
padding: 12px;
background-color: #0078d7;
color: white;
border: none;
border-radius: 8px;
font-size: 16px;
cursor: pointer;
}
button:hover {
background-color: #005fa3;
}
.result {
margin-top: 20px;
text-align: center;
font-size: 18px;
color: #333;
}
</style>
</head>
<body>
<div class="container">
<h2>BMI 计算器</h2>
<label for="height">身高（厘米）:</label>
<input type="number" id="height" placeholder="请输入您的身高，如 170">
<label for="weight">体重（斤）:</label>
<input type="number" id="weight" placeholder="请输入您的体重，如 130">
<button onclick="calculateBMI()">开始计算</button>
<div class="result" id="result"></div>
</div>
<script>
function calculateBMI() {
const height = parseFloat(document.getElementById("height").value);
const weightJin = parseFloat(document.getElementById("weight").value);
const resultEl = document.getElementById("result");
if (!height || !weightJin || height <= 0 || weightJin <= 0) {
resultEl.textContent = "请输入正确的身高和体重！";
return;
}
const weightKg = weightJin / 2;
const heightM = height / 100;
const bmi = weightKg / (heightM * heightM);
let status = "";
if (bmi < 18.5) status = "过轻";
else if (bmi < 25) status = "正常";
else if (bmi < 28) status = "过重";
else if (bmi < 32) status = "肥胖";
else status = "严重肥胖";
resultEl.textContent = `您的 BMI 是 ${bmi.toFixed(2)}，属于「${status}」`;
}
</script>
</body>
</html>
|
