代码:
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>环间f(x)</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: 'Arial Narrow', sans-serif;
}
body {
background-color: #000;
color: #fff;
font-size: 14px;
line-height: 1.4;
padding: 10px;
width: 320px;
height: 386px;
margin: 0 auto;
overflow: hidden;
}
.container {
background-color: #111;
border-radius: 16px;
padding: 16px;
height: 100%;
display: flex;
flex-direction: column;
border: 1px solid #333;
}
.header {
display: flex;
align-items: center;
margin-bottom: 16px;
padding-bottom: 12px;
border-bottom: 1px solid #333;
}
.mi-logo {
width: 20px;
height: 20px;
background-color: #ff6700;
border-radius: 4px;
display: flex;
align-items: center;
justify-content: center;
margin-right: 8px;
font-weight: bold;
font-size: 12px;
}
h1 {
font-size: 18px;
color: #fff;
font-weight: 600;
}
.input-section {
margin-bottom: 16px;
}
.input-group {
display: flex;
align-items: center;
margin-bottom: 12px;
}
.coeff-label {
width: 80px;
font-size: 14px;
color: #aaa;
}
.coeff-input {
flex: 1;
background-color: #222;
border: 1px solid #444;
border-radius: 8px;
padding: 8px 12px;
color: #fff;
font-size: 14px;
outline: none;
}
.coeff-input:focus {
border-color: #ff6700;
}
.calculate-btn {
background-color: #ff6700;
color: white;
border: none;
border-radius: 8px;
padding: 12px;
font-size: 16px;
font-weight: bold;
cursor: pointer;
width: 100%;
margin-top: 8px;
}
.calculate-btn:active {
background-color: #e55c00;
}
.result-section {
background-color: #1a1a1a;
border-radius: 12px;
padding: 16px;
flex-grow: 1;
overflow-y: auto;
}
.result-title {
font-size: 16px;
color: #ff6700;
margin-bottom: 12px;
font-weight: bold;
}
.result-item {
margin-bottom: 10px;
padding: 8px;
background-color: #222;
border-radius: 8px;
}
.result-label {
color: #aaa;
font-size: 13px;
}
.result-value {
color: #fff;
font-size: 14px;
font-weight: bold;
margin-top: 4px;
}
.function-display {
text-align: center;
font-size: 16px;
margin-bottom: 16px;
color: #4CAF50;
padding: 8px;
background-color: rgba(76, 175, 80, 0.1);
border-radius: 8px;
}
.error-message {
color: #ff4444;
text-align: center;
margin-top: 8px;
font-size: 13px;
display: none;
}
@MEDIA (max-width: 340px) {
body {
width: 100%;
height: 100%;
}
.coeff-label {
width: 70px;
font-size: 13px;
}
}
</style>
</head>
<body>
<div class="container">
<div class="header">
<div class="mi-logo">MI</div>
<h1>二次函数计算器</h1>
</div>
<div class="input-section">
<div class="function-display" id="functionDisplay">f(x) = ax² + bx + c</div>
<div class="input-group">
<div class="coeff-label">系数 a:</div>
<input type="number" id="coeffA" class="coeff-input" value="1" step="any">
</div>
<div class="input-group">
<div class="coeff-label">系数 b:</div>
<input type="number" id="coeffB" class="coeff-input" value="0" step="any">
</div>
<div class="input-group">
<div class="coeff-label">系数 c:</div>
<input type="number" id="coeffC" class="coeff-input" value="0" step="any">
</div>
<button class="calculate-btn" id="calculateBtn">计算最值与顶点</button>
<div class="error-message" id="errorMessage">错误：二次项系数a不能为零！</div>
</div>
<div class="result-section">
<div class="result-title">计算结果</div>
<div class="result-item">
<div class="result-label">函数表达式</div>
<div class="result-value" id="resultFunction">f(x) = 1x² + 0x + 0</div>
</div>
<div class="result-item">
<div class="result-label">开口方向</div>
<div class="result-value" id="resultOpening">向上</div>
</div>
<div class="result-item">
<div class="result-label">顶点坐标</div>
<div class="result-value" id="resultVertex">(0.00, 0.00)</div>
</div>
<div class="result-item">
<div class="result-label">最值</div>
<div class="result-value" id="resultExtremum">最小值: 0.00</div>
</div>
<div class="result-item">
<div class="result-label">对称轴</div>
<div class="result-value" id="resultAxis">x = 0.00</div>
</div>
</div>
</div>
<script>
const coeffA = document.getElementById('coeffA');
const coeffB = document.getElementById('coeffB');
const coeffC = document.getElementById('coeffC');
const calculateBtn = document.getElementById('calculateBtn');
const functionDisplay = document.getElementById('functionDisplay');
const resultFunction = document.getElementById('resultFunction');
const resultOpening = document.getElementById('resultOpening');
const resultVertex = docum
