<!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: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background-color: #f0f2f5;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
}
.calculator {
background-color: #fff;
padding: 30px;
border-radius: 12px;
box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
text-align: center;
width: 320px;
}
h1 {
color: #2c3e50;
margin-bottom: 25px;
font-size: 26px;
}
.input-group {
margin: 15px 0;
text-align: left;
}
label {
display: block;
color: #666;
margin-bottom: 8px;
font-size: 14px;
}
input {
width: 100%;
padding: 12px;
border: 2px solid #e0e0e0;
border-radius: 6px;
font-size: 16px;
box-sizing: border-box;
transition: border-color 0.3s;
}
input:focus {
border-color: #3498db;
outline: none;
}
button {
background-color: #3498db;
color: white;
border: none;
padding: 12px 25px;
border-radius: 6px;
font-size: 16px;
cursor: pointer;
transition: background-color 0.3s;
margin-top: 15px;
width: 100%;
}
button:hover {
background-color: #2980b9;
}
#result {
margin-top: 25px;
padding: 15px;
border-radius: 6px;
display: none;
}
.bmi-normal { background-color: #d4edda; color: #155724; }
.bmi-over { background-color: #fff3cd; color: #856404; }
.bmi-obese { background-color: #f8d7da; color: #721c24; }
.error { background-color: #f8d7da; color: #721c24; }
</style>
</head>
<body>
<div class="calculator">
<h1>BMI 身体质量指数计算器</h1>
<div class="input-group">
<label for="height">身高 (cm)</label>
<input type="number" id="height" placeholder="请输入身高" step="0.1">
</div>
<div class="input-group">
<label for="weight">体重 (kg)</label>
<input type="number" id="weight" placeholder="请输入体重" step="0.1">
</div>
<button>立即计算</button>
<div id="result"></div>
</div>
<script>
function calculateBMI() {
// 获取输入值
const height = parseFloat(document.getElementById('height').value) / 100;
const weight = parseFloat(document.getElementById('weight').value);
// 验证输入
const resultDiv = document.getElementById('result');
if (!height || !weight || height <= 0 || weight <= 0) {
resultDiv.className = 'error';
resultDiv.innerHTML = '⚠️ 请输入有效的数值';
resultDiv.style.display = 'block';
return;
}
// 计算 BMI
const bmi = weight / (height * height);
const roundedBMI = bmi.toFixed(1);
// 结果分类
let category = '';
let className = '';
if (bmi < 18.5) {
category = '体重过轻';
className = 'bmi-normal';
} else if (bmi < 24) {
category = '正常范围';
className = 'bmi-normal';
} else if (bmi < 28) {
category = '体重过重';
className = 'bmi-over';
} else {
category = '肥胖';
className = 'bmi-obese';
}
// 显示结果
resultDiv.className = className;
resultDiv.innerHTML = `
<strong>BMI 指数：${roundedBMI}</strong><br>
${category}（${getAdvice(category)}）
`;
resultDiv.style.display = 'block';
}
function getAdvice(category) {
const advice = {
'体重过轻': '建议适当增加营养摄入',
'正常范围': '继续保持健康的生活习惯',
'体重过重': '建议适当增加运动量',
'肥胖': '建议咨询专业医生制定健康计划'
};
return advice[category];
}
</script>
</body>
</html>
发表于 2025-3-18 23:20
