By default, when a visitor accesses your site, the admin bar is not shown.
默认情况下，访问者访问您的网站时，不会显示管理栏。
This makes sense for a blog, where you’re the only one that has an account.
这对于博客是有意义的，因为您是唯一拥有帐户的博客。
However, if you’re running a site where most visitors need to be logged in before doing anything useful, you probably want to make it as easy as possible for them to log in or register.
但是，如果您正在运行一个站点，需要执行大多数操作才能登录大多数访问者，那么您可能希望尽可能简化访问者的登录或注册过程。
This is what this plugin is for: it shows the login form right there in the admin bar, so that users don’t need to load another page just to enter their username and password.
此插件的作用是：它在管理栏中显示登录表单，因此用户无需加载其他页面即可输入用户名和密码。
