优化项目结构

public/assets/js/login.js

@@ -0,0 +1,50 @@
+// 页面加载时检查是否已登录
+(function() {
+    const token = localStorage.getItem('token');
+    if (token) {
+        window.location.href = '/chat.php';
+    }
+})();
+
+// 登录表单提交
+document.getElementById('loginForm').addEventListener('submit', async function(e) {
+    e.preventDefault();
+    const btn = document.getElementById('loginBtn');
+    const errorEl = document.getElementById('loginError');
+    const username = document.getElementById('username').value.trim();
+    const password = document.getElementById('password').value;
+    
+    if (!username || !password) {
+        errorEl.textContent = '请输入用户名和密码';
+        errorEl.classList.remove('hidden');
+        return;
+    }
+    
+    btn.disabled = true;
+    btn.textContent = '登录中...';
+    errorEl.classList.add('hidden');
+    
+    try {
+        const response = await fetch('/api/auth/login', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ username, password })
+        });
+        
+        const data = await response.json();
+        
+        if (data.success) {
+            localStorage.setItem('token', data.data.token);
+            window.location.href = '/chat.php';
+        } else {
+            errorEl.textContent = data.message || '登录失败';
+            errorEl.classList.remove('hidden');
+        }
+    } catch (err) {
+        errorEl.textContent = '网络错误，请稍后重试';
+        errorEl.classList.remove('hidden');
+    } finally {
+        btn.disabled = false;
+        btn.textContent = '登录';
+    }
+});