在某些情况下，打字过程中的即时反馈非常有帮助。例如，检查用户名的有效性（或可用性）不应要求用户重新提交表单（多次）。在用户打字时提供即时反馈可以让他们更轻松地进行实验，直到找到有效的输入值（例如合适的用户名）。注意：这并不总是最佳的，请使用你的判断。
¥Instant feedback during typing can be extremely helpful in certain situations. For example, checking the validity (or availability) of a username shouldn't require the user to resubmit the form (multiple times). Providing instant feedback while users are typing can allow them to experiment more easily until they find valid input value (like a suitable username). Note: This isn't always optimal, use your judgement.