原生JavaScript实现输入验证的界面

html 复制代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>原生JS输入验证</title>
    <style>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }
        
        .container {
            width: 100%;
            max-width: 500px;
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            overflow: hidden;
        }
        
        .header {
            background: linear-gradient(to right, #4776E6, #8E54E9);
            color: white;
            padding: 25px 30px;
            text-align: center;
        }
        
        .header h1 {
            font-size: 28px;
            margin-bottom: 8px;
        }
        
        .header p {
            opacity: 0.9;
            font-size: 16px;
        }
        
        .form-container {
            padding: 30px;
        }
        
        .form-group {
            margin-bottom: 25px;
            position: relative;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #333;
            font-size: 15px;
        }
        
        input {
            width: 100%;
            padding: 14px 16px;
            border: 2px solid #e1e5ee;
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s;
        }
        
        input:focus {
            outline: none;
            border-color: #4776E6;
            box-shadow: 0 0 0 3px rgba(71, 118, 230, 0.1);
        }
        
        .validation-message {
            margin-top: 6px;
            font-size: 14px;
            display: flex;
            align-items: center;
            height: 20px;
            transition: all 0.3s;
        }
        
        .success {
            color: #2ecc71;
        }
        
        .error {
            color: #e74c3c;
        }
        
        .info {
            color: #3498db;
        }
        
        .icon {
            margin-right: 6px;
            font-size: 16px;
        }
        
        .btn {
            background: linear-gradient(to right, #4776E6, #8E54E9);
            color: white;
            border: none;
            padding: 15px 20px;
            width: 100%;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            margin-top: 10px;
        }
        
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .btn:active {
            transform: translateY(0);
        }
        
        .form-footer {
            text-align: center;
            margin-top: 25px;
            font-size: 14px;
            color: #666;
        }
        
        .form-footer a {
            color: #4776E6;
            text-decoration: none;
            font-weight: 600;
        }
        
        .password-strength {
            height: 5px;
            background-color: #eee;
            margin-top: 10px;
            border-radius: 5px;
            overflow: hidden;
        }
        
        .strength-meter {
            height: 100%;
            width: 0;
            transition: all 0.3s;
        }
        
        .weak {
            background-color: #e74c3c;
            width: 33%;
        }
        
        .medium {
            background-color: #f39c12;
            width: 66%;
        }
        
        .strong {
            background-color: #2ecc71;
            width: 100%;
        }
        
        .input-status {
            position: absolute;
            right: 15px;
            top: 40px;
            font-size: 18px;
            opacity: 0;
            transition: all 0.3s;
        }
        
        .show {
            opacity: 1;
        }
        
        .success-input {
            border-color: #2ecc71;
        }
        
        .error-input {
            border-color: #e74c3c;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>表单验证示例</h1>
            <p>使用原生JavaScript实现输入验证</p>
        </div>
        
        <div class="form-container">
            <form id="validationForm">
                <div class="form-group">
                    <label for="email">电子邮箱</label>
                    <input type="text" id="email" placeholder="请输入您的邮箱">
                    <span class="input-status">✓</span>
                    <div class="validation-message"></div>
                </div>
                
                <div class="form-group">
                    <label for="password">密码</label>
                    <input type="password" id="password" placeholder="请输入密码">
                    <span class="input-status">✓</span>
                    <div class="password-strength">
                        <div class="strength-meter"></div>
                    </div>
                    <div class="validation-message"></div>
                </div>
                
                <div class="form-group">
                    <label for="phone">手机号码</label>
                    <input type="text" id="phone" placeholder="请输入手机号码">
                    <span class="input-status">✓</span>
                    <div class="validation-message"></div>
                </div>
                
                <div class="form-group">
                    <label for="username">用户名</label>
                    <input type="text" id="username" placeholder="请输入用户名">
                    <span class="input-status">✓</span>
                    <div class="validation-message"></div>
                </div>
                
                <button type="submit" class="btn">提交表单</button>
            </form>
            
            <div class="form-footer">
                已有账户？<a href="#">立即登录</a>
            </div>
        </div>
    </div>

    <script>
        document.addEventListener('DOMContentLoaded', function() {
            const form = document.getElementById('validationForm');
            const emailInput = document.getElementById('email');
            const passwordInput = document.getElementById('password');
            const phoneInput = document.getElementById('phone');
            const usernameInput = document.getElementById('username');
            
            // 为每个输入框添加输入事件监听
            emailInput.addEventListener('input', validateEmail);
            passwordInput.addEventListener('input', validatePassword);
            phoneInput.addEventListener('input', validatePhone);
            usernameInput.addEventListener('input', validateUsername);
            
            // 表单提交事件
            form.addEventListener('submit', function(e) {
                e.preventDefault();
                
                // 验证所有字段
                const isEmailValid = validateEmail();
                const isPasswordValid = validatePassword();
                const isPhoneValid = validatePhone();
                const isUsernameValid = validateUsername();
                
                if (isEmailValid && isPasswordValid && isPhoneValid && isUsernameValid) {
                    alert('表单验证成功！数据可以提交了。');
                    // 在实际应用中，这里可以提交表单数据
                } else {
                    alert('请修正表单中的错误后再提交。');
                }
            });
            
            // 邮箱验证函数
            function validateEmail() {
                const email = emailInput.value.trim();
                const messageElement = emailInput.parentNode.querySelector('.validation-message');
                const statusIcon = emailInput.parentNode.querySelector('.input-status');
                
                if (email === '') {
                    showMessage(messageElement, '请输入邮箱地址', 'error');
                    updateInputStatus(emailInput, statusIcon, false);
                    return false;
                }
                
                const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
                if (!emailRegex.test(email)) {
                    showMessage(messageElement, '邮箱格式不正确', 'error');
                    updateInputStatus(emailInput, statusIcon, false);
                    return false;
                }
                
                showMessage(messageElement, '邮箱格式正确', 'success');
                updateInputStatus(emailInput, statusIcon, true);
                return true;
            }
            
            // 密码验证函数
            function validatePassword() {
                const password = passwordInput.value;
                const messageElement = passwordInput.parentNode.querySelector('.validation-message');
                const statusIcon = passwordInput.parentNode.querySelector('.input-status');
                const strengthMeter = passwordInput.parentNode.querySelector('.strength-meter');
                
                if (password === '') {
                    showMessage(messageElement, '请输入密码', 'error');
                    updateInputStatus(passwordInput, statusIcon, false);
                    strengthMeter.className = 'strength-meter';
                    return false;
                }
                
                if (password.length < 6) {
                    showMessage(messageElement, '密码至少需要6个字符', 'error');
                    updateInputStatus(passwordInput, statusIcon, false);
                    strengthMeter.className = 'strength-meter weak';
                    return false;
                }
                
                // 密码强度检测
                let strength = 0;
                if (password.length >= 8) strength++;
                if (/[A-Z]/.test(password)) strength++;
                if (/[0-9]/.test(password)) strength++;
                if (/[^A-Za-z0-9]/.test(password)) strength++;
                
                if (strength < 2) {
                    showMessage(messageElement, '密码强度：弱', 'error');
                    strengthMeter.className = 'strength-meter weak';
                } else if (strength < 4) {
                    showMessage(messageElement, '密码强度：中', 'info');
                    strengthMeter.className = 'strength-meter medium';
                } else {
                    showMessage(messageElement, '密码强度：强', 'success');
                    strengthMeter.className = 'strength-meter strong';
                }
                
                updateInputStatus(passwordInput, statusIcon, true);
                return true;
            }
            
            // 手机号验证函数
            function validatePhone() {
                const phone = phoneInput.value.trim();
                const messageElement = phoneInput.parentNode.querySelector('.validation-message');
                const statusIcon = phoneInput.parentNode.querySelector('.input-status');
                
                if (phone === '') {
                    showMessage(messageElement, '请输入手机号码', 'error');
                    updateInputStatus(phoneInput, statusIcon, false);
                    return false;
                }
                
                const phoneRegex = /^1[3-9]\d{9}$/;
                if (!phoneRegex.test(phone)) {
                    showMessage(messageElement, '手机号码格式不正确', 'error');
                    updateInputStatus(phoneInput, statusIcon, false);
                    return false;
                }
                
                showMessage(messageElement, '手机号码格式正确', 'success');
                updateInputStatus(phoneInput, statusIcon, true);
                return true;
            }
            
            // 用户名验证函数
            function validateUsername() {
                const username = usernameInput.value.trim();
                const messageElement = usernameInput.parentNode.querySelector('.validation-message');
                const statusIcon = usernameInput.parentNode.querySelector('.input-status');
                
                if (username === '') {
                    showMessage(messageElement, '请输入用户名', 'error');
                    updateInputStatus(usernameInput, statusIcon, false);
                    return false;
                }
                
                if (username.length < 3) {
                    showMessage(messageElement, '用户名至少需要3个字符', 'error');
                    updateInputStatus(usernameInput, statusIcon, false);
                    return false;
                }
                
                if (username.length > 15) {
                    showMessage(messageElement, '用户名不能超过15个字符', 'error');
                    updateInputStatus(usernameInput, statusIcon, false);
                    return false;
                }
                
                const usernameRegex = /^[a-zA-Z0-9_]+$/;
                if (!usernameRegex.test(username)) {
                    showMessage(messageElement, '用户名只能包含字母、数字和下划线', 'error');
                    updateInputStatus(usernameInput, statusIcon, false);
                    return false;
                }
                
                showMessage(messageElement, '用户名格式正确', 'success');
                updateInputStatus(usernameInput, statusIcon, true);
                return true;
            }
            
            // 显示验证消息的辅助函数
            function showMessage(element, message, type) {
                element.textContent = message;
                element.className = 'validation-message ' + type;
                
                // 添加图标
                let icon = '';
                if (type === 'success') icon = '✓';
                else if (type === 'error') icon = '✗';
                else if (type === 'info') icon = 'ℹ';
                
                element.innerHTML = `<span class="icon">${icon}</span> ${message}`;
            }
            
            // 更新输入框状态的辅助函数
            function updateInputStatus(input, statusIcon, isValid) {
                if (isValid) {
                    input.classList.remove('error-input');
                    input.classList.add('success-input');
                    statusIcon.classList.add('show');
                    statusIcon.style.color = '#2ecc71';
                } else {
                    input.classList.remove('success-input');
                    input.classList.add('error-input');
                    statusIcon.classList.add('show');
                    statusIcon.style.color = '#e74c3c';
                }
                
                // 如果没有内容，隐藏状态图标
                if (input.value.trim() === '') {
                    statusIcon.classList.remove('show');
                    input.classList.remove('success-input', 'error-input');
                }
            }
        });
    </script>
</body>
</html>