像Google和Amazon这样的Web站点在标题处提供了一个不太显眼的文本链接，允许您登录和退出。
Web sites like Google and Amazon offer an unobtrusive text link in the header that allows you to log in and log out.
在我们的研究中，有一个模式很可行。这个模式就是：一旦登录，就把登录链接更换成用户名、id、或是email地址，接着后边放上一个退出的链接。
A pattern that worked well in our research was, once logged in, to replace the sign-in link with the user's name, id, or email address, followed by a sign-out link.
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