DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>用户登录title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<style>
body {
font-family: 'Arial', sans-serif;
background-color: #f0f2f5;
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
margin: 0;
padding: 20px;
}
.login-container {
background-color: white;
padding: 2rem;
border-radius: 8px;
box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
width: 100%;
max-width: 350px;
transition: transform 0.2s ease;
}
.login-container:hover {
transform: translateY(-3px);
}
.login-title {
text-align: center;
color: #1a73e8;
margin-bottom: 1.5rem;
padding-bottom: 0.8rem;
border-bottom: 2px solid #1a73e8;
}
.form-group {
margin-bottom: 1.2rem;
position: relative;
}
label {
display: block;
margin-bottom: 0.5rem;
color: #5f6368;
}
.input-wrapper {
position: relative;
}
input {
width: 100%;
padding: 0.8rem 0.8rem 0.8rem 2.5rem;
border: 1px solid #dadce0;
border-radius: 4px;
box-sizing: border-box;
font-size: 1rem;
transition: all 0.2s;
}
.input-icon {
position: absolute;
left: 0.8rem;
top: 50%;
transform: translateY(-50%);
color: #86909C;
}
input:focus {
outline: none;
border-color: #1a73e8;
box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
}
.login-btn {
width: 100%;
padding: 0.8rem;
background-color: #1a73e8;
color: white;
border: none;
border-radius: 4px;
font-size: 1rem;
font-weight: 500;
cursor: pointer;
transition: background-color 0.2s;
display: flex;
justify-content: center;
align-items: center;
gap: 8px;
}
.login-btn:hover {
background-color: #1557b0;
}
.login-btn.loading {
background-color: #69b1ff;
cursor: wait;
}
.spinner {
display: none;
width: 16px;
height: 16px;
border: 2px solid rgba(255, 255, 255, 0.3);
border-radius: 50%;
border-top-color: white;
animation: spin 1s linear infinite;
}
@keyframes spin {
to { transform: rotate(360deg); }
}
.login-btn.loading .spinner {
display: inline-block;
}
.error-message {
color: #d93025;
text-align: center;
margin: 1rem 0;
padding: 0.6rem;
background-color: #fff8f8;
border-radius: 4px;
display: none;
border: 1px solid #ffebee;
}
.form-options {
display: flex;
justify-content: space-between;
align-items: center;
margin: 1rem 0;
font-size: 0.9rem;
}
.remember-me {
display: flex;
align-items: center;
gap: 5px;
cursor: pointer;
}
.remember-me input {
width: auto;
padding: 0;
}
.forgot-link {
color: #1a73e8;
text-decoration: none;
}
.forgot-link:hover {
text-decoration: underline;
}
style>
head>
<body>
<div class="login-container">
<h2 class="login-title">账户登录h2>
<form id="loginForm">
<div class="form-group">
<label for="username">用户名label>
<div class="input-wrapper">
<i class="fas fa-user input-icon">i>
<input type="text" id="username" name="username" required>
div>
div>
<div class="form-group">
<label for="password">密码label>
<div class="input-wrapper">
<i class="fas fa-lock input-icon">i>
<input type="password" id="password" name="password" required>
div>
div>
<div class="form-options">
<label class="remember-me">
<input type="checkbox" id="rememberMe"> 记住我
label>
<a href="#" class="forgot-link">忘记密码?a>
div>
<button type="submit" class="login-btn">
<span>登录span>
<span class="spinner">span>
button>
<div class="error-message" id="errorMsg">用户名或密码错误div>
form>
div>
<script>
const loginForm = document.getElementById('loginForm');
const usernameInput = document.getElementById('username');
const passwordInput = document.getElementById('password');
const rememberMe = document.getElementById('rememberMe');
const errorMsg = document.getElementById('errorMsg');
const loginBtn = document.querySelector('.login-btn');
document.addEventListener('DOMContentLoaded', () => {
const savedUser = localStorage.getItem('savedUsername');
if (savedUser) {
usernameInput.value = savedUser;
rememberMe.checked = true;
}
});
loginForm.addEventListener('submit', async function(e) {
e.preventDefault();
const username = usernameInput.value.trim();
const password = passwordInput.value.trim();
if (!username) {
showError('请输入用户名');
return;
}
if (!password) {
showError('请输入密码');
return;
}
loginBtn.classList.add('loading');
loginBtn.disabled = true;
hideError();
try {
await new Promise(resolve => setTimeout(resolve, 800));
if (username === 'admin' && password === '123456') {
if (rememberMe.checked) {
localStorage.setItem('savedUsername', username);
} else {
localStorage.removeItem('savedUsername');
}
alert('登录成功！');
} else {
showError('用户名或密码错误');
passwordInput.value = '';
}
} finally {
loginBtn.classList.remove('loading');
loginBtn.disabled = false;
}
});
function showError(message) {
errorMsg.textContent = message;
errorMsg.style.display = 'block';
setTimeout(hideError, 3000);
}
function hideError() {
errorMsg.style.display = 'none';
}
[usernameInput, passwordInput].forEach(input => {
input.addEventListener('focus', hideError);
});
script>
body>
html>
基础文档标签
-
声明文档类型为HTML5，告知浏览器使用HTML5标准解析页面，确保正确渲染新特性。
-
HTML文档的根元素，lang="zh-CN"指定页面主要语言为简体中文，有助于对搜索引擎优化和辅助技术（如屏幕阅读器）有重要意义。
-
包含页面的元数据，这些信息不直接显示在页面上，但对浏览器和搜索引擎至关重要。
-
指定页面字符编码为UTF-8，支持包括中文在内的全球大多数语言字符，避免乱码问题。
-
用于响应式设计，width=device-width使页面宽度与设备屏幕宽度一致，initial-scale=1.0设置初始缩放比例为1，确保移动设备上显示正常。
-
用户登录
定义页面标题，显示在浏览器标签页上，也用于书签和搜索引擎结果展示。
-
引入外部资源，这里用于加载Font Awesome图标库，提供表单中使用的用户图标（fa-user）和锁图标（fa-lock）。
-
