这个函数有一个参数：不管进度条是否动态显示。

This function has one argument: whether the progress bar is currently pulsating or not.

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可以自动检查一个用户名或电子邮件地址是否已经不再使用，验证表单而无需刷新页面，甚至提交表单并动态显示一个结果。

You could automatically check that a user name or email address is not already in use, validate the form without refreshing the page, or even submit the form and display a result dynamically.

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