diff --git a/static/js/login.js b/static/js/login.js
new file mode 100644
index 0000000..95a2f95
--- /dev/null
+++ b/static/js/login.js
@@ -0,0 +1,51 @@
+document.addEventListener('DOMContentLoaded', () => {
+  const form = document.getElementById('loginForm');
+  const username = document.getElementById('username');
+  const password = document.getElementById('password');
+  const remember = document.getElementById('remember');
+  const error = document.getElementById('error');
+
+  function showError(msg){
+    error.textContent = msg;
+  }
+
+  function validate() {
+    if (!username.value || username.value.trim().length < 3) {
+      showError('用户名至少 3 个字符');
+      return false;
+    }
+    if (!password.value || password.value.length < 6) {
+      showError('密码至少 6 个字符');
+      return false;
+    }
+    return true;
+  }
+
+  form.addEventListener('submit', (e) => {
+    e.preventDefault();
+    showError('');
+    if (!validate()) return;
+
+    // 本地模拟认证：示例用户名/密码对
+    const validUsers = { 'alice':'password123', 'bob':'secret123', 'beppeb':'demoPass' };
+    const inputUser = username.value.trim();
+    const inputPass = password.value;
+
+    if (validUsers[inputUser] && validUsers[inputUser] === inputPass) {
+      // 登录成功：写入本地 token（示例）并跳转首页
+      const token = 'demo-token-' + Math.random().toString(36).slice(2);
+      if (remember.checked) {
+        localStorage.setItem('demo_auth_token', token);
+      } else {
+        sessionStorage.setItem('demo_auth_token', token);
+        // keep a copy in localStorage to let index.html detect login; it's demo-only
+        localStorage.setItem('demo_auth_token', token);
+      }
+      // 简短提示后跳转
+      showError('登录成功，正在跳转……');
+      setTimeout(() => { window.location.href = '/'; }, 700);
+    } else {
+      showError('用户名或密码不正确（此示例使用本地模拟账号）。');
+    }
+  });
+});