用HTML+CSS+JS实现在页面右侧悬浮浮动按钮，功能有：白天/黑夜模式转换，缩小字体，放大字体，返回顶部。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>浮动按钮组</title>
<style>
body {
font-family: Arial, sans-serif;
background-color: white;
color: black;
padding: 20px;
transition: background-color 0.3s, color 0.3s;
margin: 0;
height: 2000px;
}
body.night-mode {
background-color: #121212;
color: white;
}
.floating-buttons {
position: fixed;
right: 20px;
bottom: 20px;
display: flex;
flex-direction: column;
gap: 10px;
}
.floating-buttons button {
width: 40px;
height: 40px;
font-size: 20px;
background-color: #333;
color: white;
border: none;
border-radius: 5px;
cursor: pointer;
display: flex;
justify-content: center;
align-items: center;
}
.disabled {
text-decoration: line-through;
cursor: not-allowed;
}
</style>
</head>
<body>
<div id="content">
<h1>页面标题</h1>
<p>文本信息,wenbenxinxi。文本信息,wenbenxinxi。文本信息,wenbenxinxi。文本信息,wenbenxinxi。文本信息,wenbenxinxi。文本信息,wenbenxinxi。文本信息,wenbenxinxi。文本信息,wenbenxinxi。</p>
</div>
<div>
<button id="toggle-mode">🌙</button>
<button id="zoom-out">A</button>
<button id="zoom-in">A</button>
<button id="back-to-top">↑</button>
</div>
<script>
const body = document.body;
const toggleModeButton = document.getElementById('toggle-mode');
const zoomOutButton = document.getElementById('zoom-out');
const zoomInButton = document.getElementById('zoom-in');
const backToTopButton = document.getElementById('back-to-top');
const content = document.getElementById('content');
let scale;
const browserWidth = window.innerWidth;
if (browserWidth > 1600) {
scale = 1.2;
} else if (browserWidth > 1280) {
scale = 1.1;
} else {
scale = 1;
}
content.style.transform = `scale(${scale})`;
content.style.transformOrigin = 'top left';
toggleModeButton.addEventListener('click', function () {
if (body.classList.contains('night-mode')) {
body.classList.remove('night-mode');
this.textContent = '🌙';
} else {
body.classList.add('night-mode');
this.textContent = '☀';
}
});
zoomOutButton.addEventListener('click', function () {
if (scale > 1) {
scale -= 0.1;
content.style.transform = `scale(${scale})`;
if (scale === 1) {
this.classList.add('disabled');
}
zoomInButton.classList.remove('disabled');
}
});
zoomInButton.addEventListener('click', function () {
if (scale < 1.5) {
scale += 0.1;
content.style.transform = `scale(${scale})`;
if (scale === 1.5) {
this.classList.add('disabled');
}
zoomOutButton.classList.remove('disabled');
}
});
backToTopButton.addEventListener('click', function () {
window.scrollTo({
top: 0,
behavior: 'smooth'
});
});
zoomOutButton.style.fontSize = '12px';
zoomOutButton.style.fontWeight = 'bold';
zoomInButton.style.fontSize = '18px';
zoomInButton.style.fontWeight = 'bold';
</script>
</body>
</html>
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