对确认密码部分保证有数据读入

app/templates/signup.html

@@ -126,7 +126,7 @@ h1{
   <form action="/signup" method="POST">
     <p><input type="username" name="username" placeholder="输入用户名" required="required" class="username"></p>
     <p><input type="password" name="password" placeholder="输入密码" class="password"></p>
-    <p><input type="password" name="password2" placeholder="确认密码" class="password"></p>
+    <p><input type="password" name="password2" placeholder="确认密码" class="password" required="required"></p>
     <button type="submit" class="btn">注册</button>
   </form>